The All New . . . TACO ZONE CONTROLS WIRING GUIDE€¦ · boiler control power relay 1 relay 2 typical wiring sr501-hc-4 – one zone switching relay with or without boiler enable

The All New . . .TACO ZONE CONTROLS WIRING GUIDE

Pages

Switching Relays – Single Zone Wiring 2 – 4

Switching Relays – Oil Boiler Wiring Safety Notice – 5

Switching Relays – NON EXP Connected Together with Priority 6 – 9

Switching Relays – EXP Connected Together with Priority 10 – 13

Switching Relays – Multiple Indirect Hot Water Heaters 14 – 15

Switching Relays – EXP Connected To Reset Controls (PC700, 702 & 705) 16 – 27

Zone Valve Controls – NON EXP Connected Together with Priority 28 – 32

Zone Valve Controls – EXP Connected Together with Priority 33 – 36

Zone Valve Controls – Connected To Reset Controls (PC700, 702 & 705) 37 – 44

Hydro Air Fan Controls (HAFC 101 & 201) 45 – 49

New Expandable Zone Control – Connected to Older Expandable Zone Control 50 – 51

Specialty Thermostat and Zone Valve Wiring 52 – 61

Radiant Mixing Block 62 – 63

X-Pump Block 64 – 66

iSeries Mixing Valves 67 – 68

Low Water Cutoffs and Electric Water Feeders 69 – 84

Aquastat Wiring 85 – 91

Instruction Sheets 92 – 104

Standard Terms and Definitions – 105

Zone Controls Cross Reference 106 – 107

Do it once.Do it right.

© Taco Catalog No. 100-92 Effective Date: August 1, 2010Supersedes Date: New

TACO Zone Control Product Information

Switching RelaysProduct No. DescriptionSR501-4 1 Zone Switching RelaySR501-HC-4 1 or 2 Zone Switching Relay, High Current CapacitySR501-OR-4 1 Zone Switching Relay with Outdoor ResetSR502-4 2 Zone Switching Relay with PrioritySR503-4 3 Zone Switching Relay with PrioritySR504-4 4 Zone Switching Relay with PrioritySR506-4 6 Zone Switching Relay with Priority

Expandable Switching Relays – Expandable to 120 Zones (20 Zoning Panels)Product No. DescriptionSR501-EXP-4 1 Zone Switching RelaySR503-EXP-4 3 Zone Switching Relay with PrioritySR504-EXP-4 4 Zone Switching Relay with PrioritySR506-EXP-4 6 Zone Switching Relay with Priority

Zone Valve ControlsProduct No. DescriptionZVC403-4 3 Zone Valve Control with PriorityZVC404-4 4 Zone Valve Control with PriorityZVC405-4 5 Zone Valve Control with PriorityZVC406-4 6 Zone Valve Control with Priority

Expandable Zone Valve Controls – Expandable to 120 Zones (20 Zoning Panels)Product No. DescriptionZVC404-EXP-4 4 Zone Valve Control with Priority ZVC406-EXP-4 6 Zone Valve Control with Priority

Add-On Power Controls (For use with all -EXP controls)Product No. DescriptionPC700 Boiler Reset ControlPC702 2-Stage Boiler Reset ControlPC705 Variable Speed Pump Injection Mixing Control

Fan ControlsProduct No. DescriptionHAFC101-4 Hydro Air Fan ControlHAFC201-4 Hydro Air Fan Control with Optional Time Delays

Do it once.Do it right.

2

SR50

1-4

Switc

hing

Rel

ay W

iring

TY

PIC

AL

WIR

ING

(CO

LD S

TA

RT

)

ON

E Z

ON

ESW

ITC

HIN

G R

ELA

Y

SR 5

01-4

FUSE

6 AM

P

POW

ER

ZO

NE

1

LED

IND

ICA

TORS

FUSE

6 AM

P

NH

34

45

66

N/O

N/O

N/C

N/C

CO

MC

OM

120

VAC

INPU

T

TT

CO

M

RW

24 VAC

TO: 1

20 V

AC

PO

WER

CIR

CU

LATO

R

JUM

PE

RTO

: TT

ON

BO

ILER

THER

MO

STA

T

TO: 1

20 V

AC

PO

WER

CIR

CU

LATO

R

TO: Z

CTO

: ZR

ALT

ERN

AT

IVE

WIR

ING

(TA

NK

LESS

CO

IL)

ON

E Z

ON

ESW

ITC

HIN

G R

ELA

Y

SR 5

01-4

FUSE

6 AM

P

POW

ER

ZO

NE

1

LED

IND

ICA

TORS

FUSE

6 AM

P

NH

34

45

66

N/O

N/O

N/C

N/C

CO

MC

OM

120

VAC

INPU

T

TT

CO

M

RW

24 VACTH

ERM

OST

AT

TO: 1

20 V

AC

PO

WER

CIR

CU

LATO

R

TO: T

T O

N B

OIL

ER

ALT

ERN

AT

IVE

WIR

ING

(24

VA

C P

OW

ERED

IN

PU

T S

IGN

AL)

NH

REM

OVE

JUM

PER.

DO

NO

T C

ON

NEC

T PO

WER

TO N

AN

D H

TER

MIN

ALS

.

* T

STA

T LI

GH

T W

ILL

GO

O

N A

ND

OFF

WIT

H 2

4 VA

C

SIG

NA

L. P

OW

ER L

IGH

T

WIL

L A

LWA

YS B

E O

FF.

ON

E Z

ON

ESW

ITC

HIN

G R

ELA

Y

SR 5

01-4

FUSE

6 AM

P

POW

ER *

ZO

NE

1 *

LED

IND

ICA

TORS

FUSE

6 AM

P

NH

34

45

66

N/O

N/O

N/C

N/C

CO

MC

OM

120

VAC

INPU

T

TT

CO

M

RW

24 VAC

24 V

AC

SIG

NA

L

No

te:

Wh

en u

sin

g A

lter

nat

ive

Wir

ing

dia

gram

, th

e bo

iler

op

er-

atin

g co

ntr

ol’s

ZC

ter

min

al w

ill

see

the

load

of

the

circ

ula

tor(

s).

Warn

ing

:W

hen

u

sin

g A

lter

nat

ive

Wir

ing

dia

gram

, w

irin

gin

stru

ctio

ns

mu

st b

e fo

llow

ed s

o p

ower

ori

gin

ates

fro

m t

he

boil

eraq

uas

tat.

Fai

lure

to

foll

ow t

hes

e w

irin

g in

stru

ctio

ns

may

res

ult

ina

seco

nd

ary

sou

rce

of p

ower

bei

ng

con

nec

ted

to

the

boil

er t

hat

may

act

ivat

e it

un

der

cert

ain

cir

cum

stan

ces,

cau

sin

g in

jury

or

deat

h.

3

AlternativeWiring

ONE ZONE HCSWITCHING RELAY

SR 501-HC-4

LEDINDICATORS

R W1

24 VAC THERMOSTAT

W2COM

24VAC

T T T

N H X1RELAY 2RELAY 1

120 VACINPUT

120 VACCIRCULATOR

X1X2 X2

N

ZR

ZC

HPOWER INPUT

(120 VAC)

POWER

RELAY 1

RELAY 2


SR 501-HC-4

LEDINDICATORS

R W1

24 VAC THERMOSTAT

W2COM

24VAC

T T T


120 VACINPUT

POWERINPUT

(120 VAC)120 VAC

CIRCULATOR

X1X2 X2

N

H

BOILERCONTROL

POWER

RELAY 1

RELAY 2

TypicalWiring

SR501-HC-4 – One Zone Switching Relay with or without Boiler Enable


SR 501-HC-4

LEDINDICATORS

R W1

24 VAC THERMOSTAT

W2COM

24VAC

T T T


120 VACINPUT

240 VACCIRCULATOR

X1X2 X2

N

H1

H2

ONE ZONE, NO BOILER ENABLE(CONTROL & CIRCULATOR SAME POWER SOURCE)

CONTROL POWERINPUT (120 VAC)

POWER

RELAY 1

RELAY 2

(240 VAC)

{{ONE ZONE HC

SWITCHING RELAY

SR 501-HC-4

LEDINDICATORS

R W1

24 VAC THERMOSTAT

W2COM

24VAC

T T T


120 VACINPUT

240 VACCIRCULATOR

X1X2 X2

N

H1

H2

ONE ZONE, NO BOILER ENABLE(CONTROL & CIRCULATOR DIFFERENT POWER SOURCE)

H

POWER

RELAY 1

RELAY 2


(240 VAC)

{

{


SR 501-HC-4

LEDINDICATORS

R W1 W2COM

24VAC

T T T


120 VACINPUT

CIRCULATOR #1(120 VAC)

X1X2 X2

N

TWO ZONE, NO BOILER ENABLE

H


THERMOSTAT #2(24 VAC)


POWERINPUT

(120 VAC)

POWER

RELAY 1

RELAY 2

NOTE: When using Alternative Wiring diagram, refer to important NOTEand WARNING in SR501-HC Instruction Sheet on page 91 of this booklet.

RELAY RATING: 1/3 HP (13.8 FLA, 82.8 LRA at 120 VAC)(6.9 FLA, 41.4 LRA at 240 VAC)

SR501-OR-4 – One Zone Switching Relay with Outdoor Reset

ONE ZONE INSTALLATIONW/O INDIRECT DHW

ONE ZONESWITCHING RELAY

WITH OUTDOOR RESET

SR 5

01-O

R-4

LEDINDICATORS

POWER

TSTAT

DHWOVERRIDE

BOILERRELAY

N H

INPUT120 VAC

ZONE 1120 VAC

N H

6AMP

X RBOILER TSTAT

W C R WDHW

OUTDOORSENSOR

SUPPLYSENSOR

XDESIGN OUTDOOR

TEMPERATUREFOR 180°F SUPPLY

TEMPERATURE

OFF

-30

-20

0-10 10

20

40

30

ON

SW1

OFF

SYSTEMCIRCULATOR(OPTIONAL)

N

H

POWERINPUT

(120 VAC)

24 VACTHERMOSTAT

BOILERCONTROL

OUTDOORSENSOR

BOILERSUPPLYSENSOR

POT1

ZONE VALVE INSTALLATIONW/O ZONE CONTROL, W/O INDIRECT DHW


WITH OUTDOOR RESET

SR 5

01-O

R-4

LEDINDICATORS

POWER

TSTAT

DHWOVERRIDE

BOILERRELAY

N H

INPUT120 VAC

ZONE 1120 VAC

N H

6AMP

X RBOILER TSTAT

W C R WDHW

OUTDOORSENSOR

SUPPLYSENSOR

XDESIGN OUTDOOR


TEMPERATURE

OFF

-30

-20

0-10 10

20

40

30

ON

SW1

OFF


N

H

POWERINPUT

(120 VAC)

BOILERCONTROL

OUTDOORSENSOR

BOILERSUPPLYSENSOR

POT1

ZONE VALVEEND SWITCH(S)

THERMOSTATS(24VAC)

TRA

NSF

ORM

ER

24 VAC120 VACINPUT

MULTI-ZONE INSTALLATIONWITH ZONE CONTROL, W/O INDIRECT DHW


WITH OUTDOOR RESET

SR 5

01-O

R-4

LEDINDICATORS

POWER

TSTAT

DHWOVERRIDE

BOILERRELAY

N H

INPUT120 VAC

ZONE 1120 VAC

N H

6AMP

X RBOILER TSTAT

W C R WDHW

OUTDOORSENSOR

SUPPLYSENSOR

XDESIGN OUTDOOR


TEMPERATURE

OFF

-30

-20

0-10 10

20

40

30

ON

SW1

OFF


N

H

POWERINPUT

(120 VAC)

BOILERCONTROL

OUTDOORSENSOR

BOILERSUPPLYSENSOR

POT1

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

EXISTINGZONE VALVE CONTROL

POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH

FUSE

5 A

MP

ZONE 3 PUMPEND SWITCH

THERMOSTATS(24VAC)

T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

POWER

LEDINDICATORS

ZONE 1 ZONE 2 ZONE 3ISOLATEDX X R W R W R W

END SWITCH THERMOSTATS PRIORITY

24 VAC ZONE VALVES PRIORITY

X X

ZONE 3PRIORITY

OFF

ONC C C

2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER

TACO 3 WIREZONE VALVE

123

JUMPER3 & 4


123

MULTI-ZONE INSTALLATIONWITH ZONE CONTROL, WITH INDIRECT DHW


WITH OUTDOOR RESET

SR 5

01-O

R-4

LEDINDICATORS

POWER

TSTAT

DHWOVERRIDE

BOILERRELAY

N H

INPUT120 VAC

ZONE 1120 VAC

N H

6AMP

X RBOILER TSTAT

W C R WDHW

OUTDOORSENSOR

SUPPLYSENSOR

XDESIGN OUTDOOR


TEMPERATURE

OFF

-30

-20

0-10 10

20

40

30

ON

SW1

OFF


N

H

POWERINPUT

(120 VAC)

BOILERCONTROL

OUTDOORSENSOR

BOILERSUPPLYSENSOR

POT1

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3


POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH

FUSE

5 A

MP


THERMOSTATS(24VAC)

T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

POWER

LEDINDICATORS




X X

ZONE 3PRIORITY

OFF

ONC C C



123

JUMPER3 & 4


123

DHWAQUASTATA

4

5

NOTE: Tankless coil has priority.

L1 L2 T T

LINE VOLTAGEOIL BURNER RELAY

CIRCULATORON BOILER

(IF ATTACHED)

B2

C1

B1ZR

HONEYWELL L8124OR EQUAL

120 VAC INPUT

C2

ZC

L1 L2

(NEUTRAL)(HOT)

CIRCUITBREAKER

CUSTOMEREMERGENCY

SWITCH

THERMALFUSE

(FIROMATIC)

SERVICESWITCH

LOWWATERCUTOFF

T

FOUR ZONE SWITCHING RELAY

120 VAC CIRCULATORS

ZC INPUT

120 VAC

ZONE 1 ZONE 2 ZONE 3 ZONE 4

ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

X X R W R W R W R WISOLATED

ENDSWITCH THERMOSTATS (24 VAC)

PRIORITY120 VACZR

H H N H N H N H N H N HZONE4

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

ZONE 4PRIORITY

OFF

ON

PRIORITY

24 VAC

COM

THERMOSTATS

T

6

Two Switching Relays Connected Together

BOILER

H

N

TT T

TT T

OUTPUTNOTUSED

120 VAC INPUT


120 VAC CIRCULATORS

ZC INPUT

120 VAC


ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP



PRIORITY120 VACZR


ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

ZONE 4PRIORITY

OFF

ON

PRIORITY

TO: "TT" ON BOILER

JUMPER

24 VAC

COM

DHWHEATER

CIRCULATOR

THERMOSTATS

120 VAC INPUT


120 VAC CIRCULATORS

ZC INPUT

120 VAC


ZONE1 ZONE2 ZONE3

SR 504-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP



PRIORITY120 VACZR


ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

ZONE 4PRIORITY

OFF

ON

PRIORITY

JUMPER

24 VAC

COM

TO: "TT" ON BOILER

INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT

7

Priority Zoning Circulator Controlling Switching Relay

TO: "TT" ON BOILER

120 VAC INPUT

BOILER

H

N

MASTER

SLAVE

PRIORITYON

PRIORITYOFF

120 VACINPUT

SIX ZONE SWITCHING RELAY

120 VAC CIRCULATORSZC

INPUT120 VAC

ZONE 1 ZONE 2


ZONE1 ZONE2 ZONE3 ZONE4 ZONE5

THERMOSTATS

SR 506-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

X X R W R W R W R W R W R WISOLATED


PRIORITY120 VACZR

H H N H N H N H N H N H N H N HZONE6

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

ZONE 5

ZONE 6

LEDINDICATORS

ZONE 6PRIORITY

OFF

ON

PRIORITY

24 VAC

COM

REMOVEJUMPER

PPR

IORI

TY

24 VACOUTPUT

(OPTIONAL)

POW

ER IN H

(on)

MASTER

CIRC.ONPRIORITY

MASTER/SLAVESWITCH

R W X X R C

THERMO-STAT

ENDSWITCH

24 VACPOWER

N

PRIORITY ZONINGCIRCULATOR


8

Prio

rity

Zoni

ng C

ircul

ator

Con

trolli

ng 2

Swi

tchi

ng R

elay

s

IND

IREC

TW

ATE

R H

EATE

RA

QU

AST

AT

OR

THER

MO

STA

T

120

VAC

INPU

T

TO:

"TT"

ON

BO

ILER

H N

SLA

VE

120

VAC

INPU

T

REM

OVE

JUM

PER

MA

ST

ER

PRIO

RITY

ON

PPRIORITYPOWER IN

H

(on)

MA

STER

CIR

C.

ON

PRIO

RITY

MAS

TER/

SLAV

ESW

ITC

H

RW

XX

RC

THER

MO

-ST

AT

END

SWIT

CH

24 V

AC

POW

ER

N

PRIO

RIT

Y Z

ON

ING

CIR

CU

LATO

R

TT

T

120

VAC

INPU

T

FOU

R Z

ON

E SW

ITC

HIN

G R

ELA

Y

120

VAC

CIR

CU

LATO

RS

ZC

IN

PUT

120

VAC

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

Z

ON

E1 Z

ON

E2 Z

ON

E3

THER

MO

STA

TS

SR 5

04-4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

P

XX

RW

RW

RW

RW

ISO

LATE

DEN

DSW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

ZON

E4

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

ZO

NE

4PR

IORI

TY OFF

ON

PRIO

RITY

24 V

AC

COM

T

BO

ILE

R

SLA

VE RE

MO

VEJU

MPE

R

TT

T

FOU

R Z

ON

E SW

ITC

HIN

G R

ELA

Y

120

VAC

CIR

CU

LATO

RS

ZC

IN

PUT

120

VAC

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

Z

ON

E1 Z

ON

E2 Z

ON

E3

THER

MO

STA

TS

SR 5

04-4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

P

XX

RW

RW

RW

RW

ISO

LATE

DEN

DSW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

ZON

E4

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

ZO

NE

4PR

IORI

TY OFF

ON

PRIO

RITY

24 V

AC

COM

T

TO:

"TT"

ON

BO

ILER

PRIO

RITY

OFF

PRIO

RITY

OFF

24 V

AC

OU

TPU

T(O

PTIO

NA

L)

9

120

VA

C IN

PUT

TO:

"TT"

ON

BO

ILER

H N

SLA

VE

120

VA

C IN

PUT

REM

OVE

JUM

PER

MA

ST

ER

TT

T

120

VA

C IN

PUT

FOU

R Z

ON

E SW

ITC

HIN

G R

ELA

Y

120

VAC

CIR

CU

LATO

RS

ZC

IN

PUT

120

VAC

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

Z

ON

E1 Z

ON

E2 Z

ON

E3

THER

MO

STA

TS

SR 5

04-4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

P

XX

RW

RW

RW

RW

ISO

LATE

DEN

DSW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

ZON

E4

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

ZO

NE

4PR

IORI

TY OFF

ON

PRIO

RITY

24 V

AC

COM

T

BO

ILE

R

SLA

VE RE

MO

VEJU

MPE

R

TT

T

FOU

R Z

ON

E SW

ITC

HIN

G R

ELA

Y

120

VAC

CIR

CU

LATO

RS

ZC

IN

PUT

120

VAC

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

Z

ON

E1 Z

ON

E2 Z

ON

E3

THER

MO

STA

TS

SR 5

04-4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

P

XX

RW

RW

RW

RW

ISO

LATE

DEN

DSW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

ZON

E4

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

ZO

NE

4PR

IORI

TY OFF

ON

PRIO

RITY

24 V

AC

COM

T

ON

E Z

ON

ESW

ITC

HIN

G R

ELA

Y

SR 5

01-4

FUSE

6 AM

P

POW

ER

ZO

NE

1

LED

IND

ICA

TORS

FUSE

6 AM

P

NH

34

45

66

N/O

N/O

N/C

N/C

CO

MC

OM

120

VAC

INPU

T

TT

CO

M

RW

24 VAC

CIR

CU

LATO

R

JUM

PE

R

IND

IREC

TW

ATE

R H

EATE

RA

QU

AST

AT

OR

THER

MO

STA

T

PRIO

RITY

OFF

PRIO

RITY

OFF

SR50

1 Sw

itchi

ng R

elay

Con

trolli

ng 2

Swi

tchi

ng R

elay

s

SR501-EXP Switching Relay Controlling Another Switching Relay

120 VAC INPUT

TO: "TT"ON BOILER

BOILER

H

N

MASTER

TO: "TT" ON BOILER

POWER

ZONE 1

LEDINDICATORS

FUSE6 AMP

FUSE6 AMP

SR 501-EXP-4

POWERCONTROLS

SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL

4 MIN/24 HOUR

ACCESSORYPORT

DHW HEATERCIRCULATOR

HN/O N H120 VAC

CIRCULATORPRIMARYOUTPUT

N/CINPUT

120 VAC

ENDSWITCH

RESETOVERRIDETHERMOSTATEXPANSION

X WRX 1A 2CB24 VOLTS AC ONLY

C

SINGLE ZONEEXPANDABLE SWITCHING RELAY

120 VAC INPUT

SLAVEPRIORITY

OFF



INPUT120 VAC

ZONE 1 ZONE 2



THERMOSTATS

SR 506-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP



PRIORITY120 VACZR


ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

ZONE 5

ZONE 6

LEDINDICATORS

ZONE 6PRIORITY

OFF

ON

PRIORITY

24 VAC

COM

REMOVEJUMPER

T


NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.

10

SR501-EXP Switching Relay Controlling a Zone Valve Control

TO BOILER AQUASTAT RELAY

BOILER

H

N

BOILER TURNS ON WHEN ANY ZONE VALVE OPENS.

120 VACINPUT

TO BOILER AQUASTAT RELAY

SLAVE

SYSTEM PUMP TURNS ON WHEN ANY ZONE VALVE OPENSEXCEPT WHEN THE DHW HEATER (SR501-EXP) CALLS.

MASTER

POWER

ZONE 1

LEDINDICATORS

FUSE6 AMP

FUSE6 AMP

SR 501-EXP-4

POWERCONTROLS

SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL

4 MIN/24 HOUR

ACCESSORYPORT


HN/O N H120 VAC


N/CINPUT

120 VAC

ENDSWITCH



C


120 VAC INPUT

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH

4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)

JUMPER3 & 4

ZVC 406 – 4

SIX ZONEZONE VALVE CONTROL

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

POW

ER IN

24 V

AC

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

DRYCONTACTS

N/O COM N/C

PUMP ENDSWITCH


THERMOSTATS (24VAC)

T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6ISOLATEDX X

END SWITCH THERMOSTATS (24 VAC) PRIORITY


X X

ZONE 6PRIORITY

OFF

ON

NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.

FUSE5 AMP

R W

See NOTE 1

R W R W R WC C CR W CC

FUSE5 AMP

R W C

Powered from Transformer A Powered from Transformer B

A

B


SYSTEMPUMP

TT T


PRIORITYON


11

12

2 Expandable Switching Relays Connected Together

120 VAC INPUT

BOILER

SWITCH SETTINGS

Master/Slave: SlavePriority Zone: OffReset/Normal: Normal

120 VAC INPUTH

N

SWITCH SETTINGSMaster/Slave: MasterPriority Zone: OnReset/Normal: Normal

TO: "TT" ON BOILER

DHWCIRCULATOR

SLAVE

MASTER

FOUR ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS


INPUT120 VAC

ZONE 1

ZONE 2 ZONE 3 ZONE 4

ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

NETEXPANSIONMAIN PRIORITY

X X X X A B C R W C R W C R W C R W C 1 2

END SWITCH THERMOSTATS (24 VAC)

PRIORITY N/CPRIMARY

120 VACZR

H H N H N H N H N H N H N H N H

SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL

LOW LIMIT (ZC) ON OFF

4 MIN/24 HOUR

ZONE4 ZONE4

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

PRIMARY SYSTEMCIRCULATOR(OPTIONAL)

TO: "TT" ON BOILER WITH DHW "TT" INPUT

SIX ZONEEXPANDABLE SWITCHING RELAY

POWERCONTROLS


INPUT120 VAC

ZONE 1 ZONE 2

ZONE 3



THERMOSTATS

SR 506-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP


X X X X A B C R W C R W C R W C R W C R W C R W C 1 2


PRIORITY N/CPRIMARY

120 VACZR

H H N H N H N H N H N H N H N H N H N H

SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE6 ZONE6

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

ZONE 5

ZONE 6

LEDINDICATORS

T

T



See NOTE 1

See NOTE 1

3 Ex

pand

able

Swi

tchi

ng R

elay

s Co

nnec

ted

Toge

ther

120

VAC

INPU

T

BO

ILE

R

SWIT

CH

SET

TIN

GS

Mas

ter/

Slav

e: M

aste

rPr

iorit

y Z

one:

On

Rese

t/N

orm

al: N

orm

al

120

VAC

INPU

TH N

SWIT

CH

SET

TIN

GS

Mas

ter/

Slav

e: S

lave

Prio

rity

Zon

e: O

ffRe

set/

Nor

mal

: Nor

mal

TO:

"TT"

ON

BO

ILER

SLA

VE

MA

ST

ER

FOU

R Z

ON

EEX

PAN

DA

BLE

SWIT

CH

ING

REL

AY

POW

ERC

ON

TRO

LS

120

VAC

CIR

CU

LATO

RSZ

C

INPU

T12

0 VA

C

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

ZON

E1 Z

ON

E2 Z

ON

E3

THER

MO

STA

TS

SR 5

04-E

XP-

4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

NET

EXPA

NSI

ON

MAI

NPR

IORI

TY

XX

XX

AB

CR

WC

RW

CR

WC

RW

C1

2

END

SW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

N/C

PRIM

ARY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

NH

NH

SLA

VE

PR

IOR

ITY

ON

RE

SE

T

PR

IMA

RY

PU

MP

ON

PO

ST

PU

RG

E O

N

PR

IOR

ITY

PR

OTE

CT

ON

PU

MP

EX

ER

CIS

E O

N

30 S

EC

/2 W

K

MA

STE

R

OFF

OFF

OFF

OFF

OFF

NO

RM

AL

LOW

LIM

IT (Z

C) O

NO

FF

4 M

IN/2

4 H

OU

R

ZON

E4ZO

NE4

PRIO

RITY

AC

CES

SORY

PORT

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

TO:

"TT"

ON

BO

ILER

WIT

H

D

HW

"TT

" IN

PUT

SIX

ZO

NE

EXPA

ND

AB

LE S

WIT

CH

ING

REL

AY

POW

ERC

ON

TRO

LS

120

VAC

CIR

CU

LATO

RSZ

C

INPU

T12

0 VA

C

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

ZON

E 5

ZON

E 6

ZON

E1 Z

ON

E2 Z

ON

E3 Z

ON

E4 Z

ON

E5

THER

MO

STA

TS

SR 5

06-E

XP-

4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

NET

EXPA

NSI

ON

MAI

NPR

IORI

TY

XX

XX

AB

CR

WC

RW

CR

WC

RW

CR

WC

RW

C1

2

END

SW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

N/C

PRIM

ARY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

NH

NH

NH

NH

SLA

VE

PR

IOR

ITY

ON

RE

SE

T

PR

IMA

RY

PU

MP

ON

PO

ST

PU

RG

E O

N

PR

IOR

ITY

PR

OTE

CT

ON

PU

MP

EX

ER

CIS

E O

N

30 S

EC

/2 W

K

MA

STE

R

OFF

OFF

OFF

OFF

OFF

NO

RM

AL

LOW

LIM

IT (Z

C) O

NO

FF

4 M

IN/2

4 H

OU

R

ZON

E6ZO

NE6

PRIO

RITY

AC

CES

SORY

PORT

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

ZO

NE

5

ZO

NE

6

LED

IND

ICA

TORS

T

T

IND

IREC

TW

ATE

R H

EATE

RA

QU

AST

AT

OR

THER

MO

STA

T

FOU

R Z

ON

EEX

PAN

DA

BLE

SWIT

CH

ING

REL

AY

POW

ERC

ON

TRO

LS

120

VAC

CIR

CU

LATO

RSZ

C

INPU

T12

0 VA

C

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

ZON

E1 Z

ON

E2 Z

ON

E3

THER

MO

STA

TS

SR 5

04-E

XP-

4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

NET

EXPA

NSI

ON

MAI

NPR

IORI

TY

XX

XX

AB

CR

WC

RW

CR

WC

RW

C1

2

END

SW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

N/C

PRIM

ARY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

NH

NH

SLA

VE

PR

IOR

ITY

ON

RE

SE

T

PR

IMA

RY

PU

MP

ON

PO

ST

PU

RG

E O

N

PR

IOR

ITY

PR

OTE

CT

ON

PU

MP

EX

ER

CIS

E O

N

30 S

EC

/2 W

K

MA

STE

R

OFF

OFF

OFF

OFF

OFF

NO

RM

AL

LOW

LIM

IT (Z

C) O

NO

FF

4 M

IN/2

4 H

OU

R

ZON

E4ZO

NE4

PRIO

RITY

AC

CES

SORY

PORT

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

TSW

ITC

H S

ETTI

NG

SM

aste

r/Sl

ave:

Sla

vePr

iorit

y Z

one:

Off

Rese

t/N

orm

al: N

orm

alS

LAV

E

PRIM

ARY

SYS

TEM

CIR

CU

LATO

R(O

PTIO

NA

L)

DH

WC

IRC

ULA

TOR

NO

TE

1:

Term

inal

s C

are

for

optio

nal 2

4V t

herm

osta

tC

OM

MO

N c

onne

ctio

ns.

See

NO

TE

1

See

NO

TE

1Se

e N

OT

E 1

13

120

VAC

INPU

T

TO:

"TT"

ON

BO

ILER

H N

SLA

VE

120

VAC

INPU

T

MA

ST

ER

TT

T

120

VAC

INPU

T

FOU

R Z

ON

E SW

ITC

HIN

G R

ELA

Y

120

VAC

CIR

CU

LATO

RS

ZC

IN

PUT

120

VAC

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

Z

ON

E1 Z

ON

E2 Z

ON

E3

THER

MO

STA

TS

SR 5

04-4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

P

XX

RW

RW

RW

RW

ISO

LATE

DEN

DSW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

120

VA

CZ

RH

HN

HN

HN

HN

HN

HZO

NE4

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

ZO

NE

4PR

IORI

TY OFF

ON

PRIO

RITY

24 V

AC

COM

BO

ILE

R

SLA

VE

ZO

NE

NO

TU

SED

TT

T

FOU

R Z

ON

E SW

ITC

HIN

G R

ELA

Y

120

VAC

CIR

CU

LATO

RS

ZC

IN

PUT

120

VAC

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

Z

ON

E1 Z

ON

E2 Z

ON

E3

THER

MO

STA

TS

SR 5

04-4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

P

XX

RW

RW

RW

RW

ISO

LATE

DEN

DSW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

120

VA

CZ

RH

HN

HN

HN

HN

HN

HZO

NE4

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

ZO

NE

4PR

IORI

TY OFF

ON

PRIO

RITY

24 V

AC

COM

IND

IREC

TW

ATE

R H

EATE

RA

QU

AST

AT

OR

THER

MO

STA

T

ZO

NE

NO

TU

SED

JUM

PER

JUM

PER

PRIO

RITY

ON

PRIO

RITY

ON

TWO

ZO

NE

SWIT

CH

ING

REL

AY

CIR

CU

LATO

RS

ZC

IN

PUT

120

VAC

ZON

E 1

ZON

E 2

PRIO

RITY

Z

ON

E1

ZO

NE2

PRIO

RITY

SR 5

02-4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

P

XX

RW

RW

ISO

LATE

DEN

DSW

ITC

HTH

ERM

OST

ATS

120

VA

C

ZR

HH

NH

NH

NH

ZO

NE

2

POW

ER

ZO

NE

1

LED

IND

ICA

TORS

ZO

NE

2PR

IORI

TY OFF

ON

JUM

PER

24 V

AC

COM

120

VAC

PRIO

RITY

OFF

IND

IREC

TW

ATE

R H

EATE

RA

QU

AST

AT

OR

THER

MO

STA

T

2 In

dire

ct W

ater

Hea

ters

with

Prio

rity

Conn

ecte

d to

Sta

ndar

d Sw

itchi

ng R

elay

s

14

15

TO:

"TT"

ON

BO

ILER

120

VAC

INPU

T

BO

ILE

R

IND

IREC

TW

ATE

R H

EATE

RA

QU

AST

AT

OR

THER

MO

STA

T

TWO

ZO

NE

SWIT

CH

ING

REL

AY

CIR

CU

LATO

RS

ZC

IN

PUT

120

VAC

ZON

E 1

ZON

E 2

PRIO

RITY

Z

ON

E1

ZO

NE2

PRIO

RITY

SR 5

02-4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

P

XX

RW

RW

ISO

LATE

DEN

DSW

ITC

HTH

ERM

OST

ATS

120

VAC

ZR

HH

NH

NH

NH

ZO

NE

2

POW

ER

ZO

NE

1

LED

IND

ICA

TORS

ZO

NE

2PR

IORI

TY OFF

ON

JUM

PER

24 V

AC

COM

DH

W C

IRC

ULA

TORS

PRIO

RITY

OFF

IND

IREC

TW

ATE

R H

EATE

RA

QU

AST

AT

OR

THER

MO

STA

T

120

VAC

INPU

T

H N

FOU

R Z

ON

EEX

PAN

DA

BLE

SWIT

CH

ING

REL

AY

POW

ERC

ON

TRO

LS

120

VAC

CIR

CU

LATO

RSZ

C

INPU

T12

0 V

AC

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

ZO

NE1

ZO

NE2

ZO

NE3

THER

MO

STA

TS

SR 5

04-E

XP-

4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

NET

EXPA

NSI

ON

MAI

NPR

IORI

TY

XX

XX

AB

CR

WC

RW

CR

WC

RW

C1

2

END

SW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

N/C

PRIM

ARY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

NH

NH

SLA

VE

PR

IOR

ITY

ON

RE

SE

T

PR

IMA

RY

PU

MP

ON

PO

ST

PU

RG

E O

N

PR

IOR

ITY

PR

OTE

CT

ON

PU

MP

EX

ER

CIS

E O

N

30 S

EC

/2 W

K

MA

STE

R

OFF

OFF

OFF

OFF

OFF

NO

RM

AL

LOW

LIM

IT (Z

C) O

NO

FF

4 M

IN/2

4 H

OU

R

ZO

NE4

ZO

NE4

PRIO

RITY

AC

CES

SORY

PORT

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

T

SWIT

CH

SET

TIN

GS

Mas

ter/

Slav

e: M

aste

rPr

iorit

y Z

one:

On

Rese

t/N

orm

al: N

orm

alM

AS

TE

R

PRIM

ARY

SYS

TEM

CIR

CU

LATO

R(O

PTIO

NA

L)

ZO

NE

NO

TU

SED

FOU

R Z

ON

EEX

PAN

DA

BLE

SWIT

CH

ING

REL

AY

POW

ERC

ON

TRO

LS

120

VAC

CIR

CU

LATO

RSZ

C

INPU

T12

0 V

AC

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

ZO

NE1

ZO

NE2

ZO

NE3

THER

MO

STA

TS

SR 5

04-E

XP-

4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

NET

EXPA

NSI

ON

MAI

NPR

IORI

TY

XX

XX

AB

CR

WC

RW

CR

WC

RW

C1

2

END

SW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

N/C

PRIM

ARY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

NH

NH

SLA

VE

PR

IOR

ITY

ON

RE

SE

T

PR

IMA

RY

PU

MP

ON

PO

ST

PU

RG

E O

N

PR

IOR

ITY

PR

OTE

CT

ON

PU

MP

EX

ER

CIS

E O

N

30 S

EC

/2 W

K

MA

STE

R

OFF

OFF

OFF

OFF

OFF

NO

RM

AL

LOW

LIM

IT (Z

C) O

NO

FF

4 M

IN/2

4 H

OU

R

ZO

NE4

ZO

NE4

PRIO

RITY

AC

CES

SORY

PORT

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

TSW

ITC

H S

ETTI

NG

SM

aste

r/Sl

ave:

Sla

vePr

iorit

y Z

one:

Off

Rese

t/N

orm

al: N

orm

alS

LAV

E

NO

TE

1:

Term

inal

s C

are

for

optio

nal 2

4V t

herm

osta

tC

OM

MO

N c

onne

ctio

ns.

See

NO

TE

1

2 In

dire

ct W

ater

Hea

ters

with

Prio

rity

Conn

ecte

d to

EXP

Swi

tchi

ng R

elay

s

PC700 Boiler Reset Control Connected to SR501-EXP Switching Relay

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC700

SWITCH SETTINGS

Master/Slave: MasterReset/Normal: Reset

SYSTEMCIRCULATOR

TO: "TT" ON BOILER

POWER

ZONE 1

LEDINDICATORS

FUSE6 AMP

FUSE6 AMP

SR 501-EXP-4

POWERCONTROLS

SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL

4 MIN/24 HOUR

ACCESSORYPORT

HN/O N H120 VAC


N/CINPUT

120 VAC

ENDSWITCH



C


THERMOSTAT

T

120 VAC INPUTH

N

BOILER

To: DHW Aquastat if PC700Boiler Reset Temperature isto be overridden duringDHW call.


16

17

FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY

ZONE 4

ONOFF

PRIORITY

120V RELAY

120 VOLT CIRCULATORSZC ZR

X XEND

SWITCH

POWERINPUT

120 VACINPUT

ZONE1 ZONE2

ZONE3

ZONE4

ZONE1 ZONE2 ZONE3 ZONE4

FUSE 1 AMP

24 V

AC

POW

ER

SR 504

ZONE 2

POWERZONE 1

ZONE 3ZONE 4

THERMOSTATS

BOILER

H

N

MASTEREXISTINGZONECONTROL

T

PRIMARYSYSTEM

CIRCULATOR(Optional)

TO: "TT" ON BOILER

JUMPER

DHWHEATER

CIRCULATOR

Note: If Zone Control comes on without a call for heat,reverse Reset Override input (1 & 2) wires on SR501-EXP.

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC700

SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset

POWER

ZONE 1

LEDINDICATORS

FUSE6 AMP

FUSE6 AMP

SR 501-EXP-4

POWERCONTROLS

SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL

4 MIN/24 HOUR

ACCESSORYPORT

HN/O N H120 VAC


N/CINPUT

120 VAC

ENDSWITCH



C



SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Switching Relay


ZONE 4

ONOFF

PRIORITY

120V RELAY


X XEND

SWITCH

POWERINPUT

120 VACINPUT

ZONE1 ZONE2

ZONE3

ZONE4


FUSE 1 AMP

24 V

AC

POW

ER

SR 504

ZONE 2

POWERZONE 1

ZONE 3ZONE 4

THERMOSTATS

BOILER

H

N

EXISTINGZONECONTROL

T

TO: "TT" ON BOILER

REMOVEJUMPER

DHWHEATER

CIRCULATOR

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC700

SLAVE

MASTER


POWER

ZONE 1

LEDINDICATORS

FUSE6 AMP

FUSE6 AMP

SR 501-EXP-4

POWERCONTROLS

SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL

4 MIN/24 HOUR

ACCESSORYPORT

HN/O N H120 VAC


N/CINPUT

120 VAC

ENDSWITCH



C




See NOTE 1

Connecting a DHW Heater to an Existing Heating Only Switching RelayUsing an SR501-EXP and PC700 Boiler Reset Control

SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Zone Valve Control

120 VACINPUT

BOILER

H

N

EXISTINGZONECONTROL

TO: "TT" ON BOILER



ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC700

24 VAC

POWER IN


MODENORMAL RESET

FUSE

(3 AM

P MA

X)

ZONE 1T T T T T T T T

ZONE 4PRIORITY

OFF

ON

N/O COM N/CZONE 4 RELAY 1 2 3 4 1 2 3 4

ZONE 1 ZONE 2

2 WIRE ZONE VALVE(NO END SWITCH)

JUMPER3 & 4

TACO3 WIRE ZONE VALVE

123

1 2 3 4ZONE 3

MOTOR ENDSWITCH


T STAT 1VALVE 1T STAT 2VALVE 2T STAT 3VALVE 3T STAT 4VALVE 4POWER

ENDSWITCH

EXTRAEND

SWITCH

MAIN

24VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

ZVC 404 FOUR ZONE ZONE VALVE CONTROL

WITH OPTIONAL PRIORITY

1 2 3 4ZONE 4

PRIORITYZONE

JUMPER3 & 4 SEE NOTE

THERMOSTATS

T TT

Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.

ZONE VALVE SYSTEMCIRCULATOR


MASTER

PRIMARY SYSTEMCIRCULATOR

(Optional)


POWER

ZONE 1

LEDINDICATORS

FUSE6 AMP

FUSE6 AMP

SR 501-EXP-4

POWERCONTROLS

SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL

4 MIN/24 HOUR

ACCESSORYPORT

HN/O N H120 VAC


N/CINPUT

120 VAC

ENDSWITCH



C


Connecting a DHW Heater to an Existing Heating Only Zone Valve ControlUsing an SR501-EXP and PC700 Boiler Reset Control

120 VACINPUT

BOILER

H

N

EXISTINGZONECONTROL


TO: "TT" ON BOILER

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC700

24 VAC

POWER IN


MODENORMAL RESET

FUSE

(3 AM

P MA

X)


ZONE 4PRIORITY

OFF

ON

N/O COM N/CZONE 4 RELAY 1 2 3 4 1 2 3 4

ZONE 1 ZONE 2


JUMPER3 & 4


123

1 2 3 4ZONE 3

MOTOR ENDSWITCH


T STAT 1VALVE 1T STAT 2VALVE 2T STAT 3VALVE 3T STAT 4VALVE 4POWER

ENDSWITCH

EXTRAEND

SWITCH

MAIN

24VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

ZVC 404 FOUR ZONE ZONE VALVE CONTROL


1 2 3 4ZONE 4

PRIORITYZONE

JUMPER3 & 4 SEE NOTE

THERMOSTATS

T TT

Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.ZONE VALVE SYSTEM

CIRCULATOR

SLAVE

MASTER

SWITCH SETTINGS


POWER

ZONE 1

LEDINDICATORS

FUSE6 AMP

FUSE6 AMP

SR 501-EXP-4

POWERCONTROLS

SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL

4 MIN/24 HOUR

ACCESSORYPORT

HN/O N H120 VAC


N/CINPUT

120 VAC

ENDSWITCH



C




See NOTE 1

18

19

SR501-EXP and PC702 Boiler Reset Control Connected to an Existing Switching Relay


ZONE 4

ONOFF

PRIORITY

120V RELAY


X XEND

SWITCH

POWERINPUT

120 VACINPUT

ZONE1 ZONE2

ZONE3

ZONE4


FUSE 1 AMP

24 V

AC

POW

ER

SR 504

ZONE 2

POWERZONE 1

ZONE 3ZONE 4

THERMOSTATS

H

N

MASTEREXISTINGZONECONTROL

T

PRIMARYSYSTEM


JUMPER

DHWHEATER

CIRCULATOR



POWER

ZONE 1

LEDINDICATORS

FUSE6 AMP

FUSE6 AMP

SR 501-EXP-4

POWERCONTROLS

SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL

4 MIN/24 HOUR

ACCESSORYPORT

HN/O N H120 VAC


N/CINPUT

120 VAC

ENDSWITCH



C



ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC702

STAGE1

STAGE2

BOILER#2

BOILER#1

DHWDEMAND

WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW

SR501-EXP and PC705 Variable Speed Pump Injection Control Connectedto an Existing Switching Relay


ZONE 4

ONOFF

PRIORITY

120V RELAY


X XEND

SWITCH

POWERINPUT

120 VACINPUT

ZONE1 ZONE2

ZONE3

ZONE4


FUSE 1 AMP

24 V

AC

POW

ER

SR 504

ZONE 2

POWERZONE 1

ZONE 3ZONE 4

THERMOSTATS

BOILER

H

N

EXISTINGZONECONTROL

T

TO: "TT" ON BOILER

SLAVE

MASTER

SWITCH SETTINGS


POWER

ZONE 1

LEDINDICATORS

FUSE6 AMP

FUSE6 AMP

SR 501-EXP-4

POWERCONTROLS

SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL

4 MIN/24 HOUR

ACCESSORYPORT

HN/O N H120 VAC


N/CINPUT

120 VAC

ENDSWITCH



C



ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC705-2

SUPSEN

SUPPLY SENSOR

INJECTIONCIRCULATOR

SYSTEMCIRCULATOR

BLACK

BLUE

RED

GREEN/GROUND

(SEE NOTE BON PAGE 22)

PRIMARYSYSTEM



JUMPER

ZONE

CONT

ROL

BOIL

SEN

OUT

SEN B

OIL

ER

SE

NS

OR

OU

TDO

OR

SE

NS

OR

PC

700

BO

ILE

R

120

VAC

INPU

T

SWIT

CH

SET

TIN

GS

Mas

ter/

Slav

e: M

aste

rPr

iorit

y Z

one:

On

or O

ffRe

set/

Nor

mal

: Res

et

FOU

R Z

ON

EEX

PAN

DA

BLE

SWIT

CH

ING

REL

AY

POW

ERC

ON

TRO

LS

120

VAC

CIR

CU

LATO

RSZ

C

INPU

T12

0 VA

C

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

ZON

E1 Z

ON

E2 Z

ON

E3

THER

MO

STA

TS

SR 5

04-E

XP-

4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

NET

EXPA

NSI

ON

MAI

NPR

IORI

TY

XX

XX

AB

CR

WC

RW

CR

WC

RW

C1

2

END

SW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

N/C

PRIM

ARY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

NH

NH

SLA

VE

PR

IOR

ITY

ON

RE

SE

T

PR

IMA

RY

PU

MP

ON

PO

ST

PU

RG

E O

N

PR

IOR

ITY

PR

OTE

CT

ON

PU

MP

EX

ER

CIS

E O

N

30 S

EC

/2 W

K

MA

STE

R

OFF

OFF

OFF

OFF

OFF

NO

RM

AL

LOW

LIM

IT (Z

C) O

NO

FF

4 M

IN/2

4 H

OU

R

ZON

E4ZO

NE4

PRIO

RITY

AC

CES

SORY

PORT

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

T

H N

NO

TE

1:

Term

inal

s C

are

for

optio

nal 2

4V t

herm

osta

tC

OM

MO

N c

onne

ctio

ns.

PRIM

ARY

SYS

TEM

CIR

CU

LATO

R(O

PTIO

NA

L)

PC70

0 Bo

iler R

eset

Con

trol C

onne

cted

to E

XP S

witc

hing

Rel

ay

20

21

ZONE

CONT

ROL

BOIL

SEN

OUT

SEN

BO

ILE

R S

EN

SO

R

OU

TDO

OR

SE

NS

OR

PC

702

STAG

E1

STAG

E2

BO

ILE

R#2

BO

ILE

R#1

DH

WD

EM

AN

D

WIR

ING

NEE

DED

ON

LY IF

PRIO

RITY

ZO

NE

IS D

HW

PRIM

ARY

SYS

TEM

CIR

CU

LATO

R(O

PTIO

NA

L)

120

VAC

INPU

T

SWIT

CH

SET

TIN

GS

Mas

ter/

Slav

e: M

aste

rPr

iorit

y Z

one:

On

or O

ffRe

set/

Nor

mal

: Res

et

FOU

R Z

ON

EEX

PAN

DA

BLE

SWIT

CH

ING

REL

AY

POW

ERC

ON

TRO

LS

120

VAC

CIR

CU

LATO

RSZ

C

INPU

T12

0 VA

C

ZO

NE

1

ZON

E 2

ZON

E 3

ZON

E 4

ZON

E1 Z

ON

E2 Z

ON

E3

THER

MO

STA

TS

SR 5

04-E

XP-

4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

NET

EXPA

NSI

ON

MAI

NPR

IORI

TY

XX

XX

AB

CR

WC

RW

CR

WC

RW

C1

2

END

SW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

N/C

PRIM

ARY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

NH

NH

SLA

VE

PR

IOR

ITY

ON

RE

SE

T

PR

IMA

RY

PU

MP

ON

PO

ST

PU

RG

E O

N

PR

IOR

ITY

PR

OTE

CT

ON

PU

MP

EX

ER

CIS

E O

N

30 S

EC

/2 W

K

MA

STE

R

OFF

OFF

OFF

OFF

OFF

NO

RM

AL

LOW

LIM

IT (Z

C) O

NO

FF

4 M

IN/2

4 H

OU

R

ZON

E4ZO

NE4

PRIO

RITY

AC

CES

SORY

PORT

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

T

H N

NO

TE

1:

Term

inal

s C

are

for

optio

nal 2

4V t

herm

osta

tC

OM

MO

N c

onne

ctio

ns.

PC70

2 2–

Stag

e Bo

iler R

eset

Con

trol C

onne

cted

to E

XP S

witc

hing

Rel

ay

TO:

"TT"

ON

BO

ILER

BO

ILE

R

ZONE

CONT

ROL

BOIL

SEN

OUT

SEN

BO

ILE

R S

EN

SO

R

OU

TDO

OR

SE

NS

OR

PC

705-

2

SUP

SEN

SU

PP

LY S

EN

SO

R

INJE

CTI

ON

CIR

CU

LATO

R

SYST

EMA

ND

/OR

BOIL

ERC

IRC

ULA

TOR

BLA

CK

BLU

E

REDGRE

EN/G

ROU

ND

(SEE

NO

TE B

)

NO

TE A

: W

HEN

SYS

TEM

CIR

CU

LATO

R IS

CO

NN

ECTE

D T

O P

RIM

ARY

CIR

CU

LATO

R TE

RMIN

AL

ON

SW

ITC

HIN

G R

ELA

Y,

THE

PRIM

ARY

PU

MP

DIP

SW

ITC

H S

ETS

OPE

RATI

ON

OF

THIS

OU

TPU

T.

NO

TE B

: W

HEN

SYS

TEM

CIR

CU

LATO

R IS

CO

NN

ECTE

D T

O R

ED W

IRE

ON

PC

705-

2, T

HE

CIR

CU

LATO

R W

ILL

OPE

RATE

ON

LY W

HEN

TH

ERM

OST

AT

CA

LLS

FOR

HEA

T

AN

D T

HE

OU

TDO

OR

TEM

PERA

TURE

IS B

ELO

W T

HE

WA

RM W

EATH

ER S

HU

T D

OW

N (

WW

SD)

TEM

PERA

TURE

. TH

E W

WSD

CA

N B

E A

DJU

STED

OR

TURN

ED

OFF

SO

TH

AT

THE

CIR

CU

LATO

R IS

NO

T A

FFEC

TED

BY

OU

TDO

OR

TEM

PERA

TURE

.

SYST

EMA

ND

/OR

BOIL

ERC

IRC

ULA

TOR

(SEE

NO

TE A

)

120

VAC

INPU

T

SWIT

CH

SET

TIN

GS

Mas

ter/

Slav

e: M

aste

rPr

iorit

y Z

one:

On

or O

ffRe

set/

Nor

mal

: Res

et

FOU

R Z

ON

EEX

PAN

DA

BLE

SWIT

CH

ING

REL

AY

POW

ERC

ON

TRO

LS

120

VAC

CIR

CU

LATO

RSZ

C

INPU

T12

0 VA

C

ZON

E 1

ZO

NE

2 ZO

NE

3 ZO

NE

4

ZON

E1 Z

ON

E2 Z

ON

E3

THER

MO

STA

TS

SR 5

04-E

XP-

4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

NET

EXPA

NSI

ON

MAI

NPR

IORI

TY

XX

XX

AB

CR

WC

RW

CR

WC

RW

C1

2

END

SW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

N/C

PRIM

ARY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

NH

NH

SLA

VE

PR

IOR

ITY

ON

RE

SE

T

PR

IMA

RY

PU

MP

ON

PO

ST

PU

RG

E O

N

PR

IOR

ITY

PR

OTE

CT

ON

PU

MP

EX

ER

CIS

E O

N

30 S

EC

/2 W

K

MA

STE

R

OFF

OFF

OFF

OFF

OFF

NO

RM

AL

LOW

LIM

IT (Z

C) O

NO

FF

4 M

IN/2

4 H

OU

R

ZON

E4ZO

NE4

PRIO

RITY

AC

CES

SORY

PORT

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

T

HN

NO

TE

1:

Term

inal

s C

are

for

optio

nal 2

4V t

herm

osta

tC

OM

MO

N c

onne

ctio

ns.

PC70

5 Va

riabl

e Sp

eed

Pum

p In

ject

ion

Cont

rol C

onne

cted

to E

XP S

witc

hing

Rel

ay

22

23

PC700 Boiler Reset Control Connected to 2 EXP Switching Relays

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC700

BOILER

120 VAC INPUT

SWITCH SETTINGS

Master/Slave: MasterPriority Zone: On or OffReset/Normal: Reset

FOUR ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS


INPUT120 VAC

ZONE 1


ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE4 ZONE4

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

T


120 VAC INPUT

SWITCH SETTINGS


FOUR ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS


INPUT120 VAC

ZONE 1


ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE4 ZONE4

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

T

H

N

MASTER

SLAVE

See NOTE 1


See NOTE 1

PC702 2–Stage Boiler Reset Control Connected to 2 EXP Switching Relays

120 VAC INPUT

SWITCH SETTINGS


FOUR ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS


INPUT120 VAC

ZONE 1


ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE4 ZONE4

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

T

120 VAC INPUT

SWITCH SETTINGS


FOUR ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS


INPUT120 VAC

ZONE 1


ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE4 ZONE4

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

T

H

N

MASTER

SLAVE

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC702

STAGE1

STAGE2

BOILER#2

BOILER#1

DHWDEMAND



See NOTE 1


See NOTE 1

24

25

PC705 Variable Speed Pump Injection Control Connected to 2 EXP Switching Relays

120 VAC INPUT

SWITCH SETTINGS


FOUR ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS


INPUT120 VAC

ZONE 1


ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE4 ZONE4

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

T

120 VAC INPUT

SWITCH SETTINGS


FOUR ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS


INPUT120 VAC

ZONE 1


ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE4 ZONE4

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

T

H

N

MASTER

SLAVE

TO: "TT" ON BOILER

BOILER

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC705-2

SUPSEN

SUPPLY SENSOR

INJECTIONCIRCULATOR

SYSTEMCIRCULATOR

BLACK

BLUE

RED

GREEN/GROUND


(SEE NOTE AON PAGE 22)


See NOTE 1


See NOTE 1

PC700 and PC705 Controls Connected to 2 EXP Switching Relays

120 VAC INPUT

SWITCH SETTINGS


FOUR ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS


INPUT120 VAC

ZONE 1


ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE4 ZONE4

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

T

120 VAC INPUT

SWITCH SETTINGS

Master/Slave: SlavePriority Zone: OffReset/Normal: Reset

FOUR ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS


INPUT120 VAC

ZONE 1


ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE4 ZONE4

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

T

H

N

MASTER

SLAVE

TO: "TT" ON BOILER

BOILER

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC705-2

SUPSEN

SUPPLY SENSOR

INJECTIONCIRCULATOR

SYSTEMCIRCULATOR

BLACK

BLUE

RED

GREEN/GROUND


ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC700

(SEE NOTE AON PAGE 22)


See NOTE 1


See NOTE 1

26

27

PC702 and PC705 Controls Connected to 2 EXP Switching Relays

120 VAC INPUT

SWITCH SETTINGS


FOUR ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS


INPUT120 VAC

ZONE 1


ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE4 ZONE4

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

T

SWITCH SETTINGS

Master/Slave: SlavePriority Zone: OffReset/Normal: Reset

FOUR ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS


INPUT120 VAC

ZONE 1


ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE4 ZONE4

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

MASTER

SLAVE

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC702

STAGE1

STAGE2

BOILER#2

BOILER#1

DHWDEMAND


120 VAC INPUTH

N

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC705-2

SUPSEN

SUPPLY SENSOR

INJECTIONCIRCULATOR

SYSTEMCIRCULATOR

BLACK

BLUE

RED

GREEN/GROUND


T


See NOTE 1


See NOTE 1

28

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FACTORYINSTALLED

TRANSFORMER

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POWER IN24 VAC

24

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TRANSFORMER

120

VA

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LATE

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HTH

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VA

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24 V

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NE

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2:

Whe

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the

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FUSE

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TW

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RA

QU

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AT

OR

THER

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STA

T

See N

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RW

RW

CC

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Tra

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TRANSFORMER

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POWER IN24 VAC

24

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FACTORYINSTALLED

TRANSFORMER

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N/O

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MN

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PRIO

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24 V

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TY

XX

ZO

NE

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TY OFF

ON

NO

TE

2:

Whe

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the

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zone

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FUSE

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RW

IND

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TW

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QU

AST

AT

OR

THER

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STA

T

See N

OT

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RW

RW

CC

CR

WC

C

FUSE

5 A

MP

RW

C

NO

TE

1:

Term

inal

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nal 2

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from

Tra

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from

Tra

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24

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FACTORYINSTALLED

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CIN

PUT

WH

ITE

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POWER IN24 VAC

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FACTORYINSTALLED

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MN

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24 V

AC

ZO

NE

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IORI

TY

XX

ZO

NE

6PR

IORI

TY OFF

ON

NO

TE

2:

Whe

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circ

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oris

use

d on

the

prio

rity

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ne.

FUSE

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RW

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TW

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RA

QU

AST

AT

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THER

MO

STA

T

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OT

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RW

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CC

CR

WC

C

FUSE

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C

NO

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1:

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nal 2

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from

Tra

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ered

from

Tra

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23

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L

24

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FACTORYINSTALLED

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120

VA

CIN

PUT

WH

ITE

BLA

CK

POWER IN24 VAC

24

VAC

FACTORYINSTALLED

TRANSFORMER

120

VA

CIN

PUT

WH

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BLA

CK

N/O

CO

MN

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PUM

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WIT

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ICA

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ER A

QU

AST

AT

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ISO

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DX

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END

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HTH

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OST

ATS

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VA

C)

PRIO

RITY

24 V

AC

ZO

NE

VALV

ESPR

IORI

TY

XX

ZO

NE

6PR

IORI

TY OFF

ON

NO

TE

2:

Whe

n a

circ

ulat

oris

use

d on

the

prio

rity

zone

inst

ead

of a

zon

e va

lve,

jum

per

3 a

nd 4

of t

hep

riorit

y zo

ne.

FUSE

5 A

MP

RW

IND

IREC

TW

ATE

R H

EATE

RA

QU

AST

AT

OR

THER

MO

STA

T

See N

OT

E 1

RW

RW

RW

CC

CR

WC

C

FUSE

5 A

MP

RW

C

NO

TE

1:

Term

inal

s C

are

for

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nal 2

4V t

herm

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ered

from

Tra

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from

Tra

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MP

SYST

EM P

UM

P A

ND

BO

ILER

TU

RN O

N W

HEN

AN

Y Z

ON

E VA

LVE

OPE

NS.

DH

W P

UM

P TU

RNS

ON

ON

LY W

HEN

PRI

ORI

TY Z

ON

E C

ALL

S.SE

CO

ND

ARY

PU

MP

CO

MES

ON

WH

EN A

NY

ZO

NE

CA

LLS

EXC

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PRI

ORI

TY Z

ON

E.

TT

T

ZVC4

03/4

04/4

05/4

06 w

ith S

yste

m, D

HW a

nd S

econ

dary

Pum

ps

32

2 ZVC403/404/405/406 Connected Together with Priority

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4

ZVC 404 – 4

FOUR ZONEZONE VALVE CONTROL

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK POW

ER IN

24 V

AC

TOCIRCULATOR

DRYCONTACTS

N/O COM N/C

PUMP ENDSWITCH

FUSE

5 A

MP


T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

POWER

LEDINDICATORS

ZONE 1 ZONE 2 ZONE 3 ZONE 4ISOLATEDX X



X X

ZONE 4PRIORITY

OFF

ON


THERMOSTATS (24VAC)

R W R W R WC C C

See NOTE 1

R W C


1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK POW

ER IN

24 V

AC

TOCIRCULATOR

DRYCONTACTS

N/O COM N/C

PUMP ENDSWITCH

FUSE

5 A

MP


T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

POWER

LEDINDICATORS

TO: BOILER AQUASTAT RELAY




X X

ZONE 4PRIORITY

OFF

ON


THERMOSTATS (24VAC)


R W R W R WC C C

See NOTE 1

R W C

BOILER

H

N


PRIORITYON

PRIORITYON

T T T

T T T

ZVC 404 – 4


33

2 EXP Zone Valve Controls Connected Together with System Pump

24 VAC FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

H

N

BOILER

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

SWITCH SETTINGS

Master/Slave: MasterPriority Zone: OnReset/Normal: Normal

SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Normal

120 VACINPUT

MASTER

SLAVE

SYSTEM PUMP AND BOILER TURN ONWHEN ANY ZONE VALVE OPENS.

SYSTEMPUMP

DRYCONTACTS

DRYCONTACTS



1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4

ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL

POW

ER IN

24 V

AC

N/O COM N/C


SLAVEPRIORITY ON

RESETPOST PURGE ON

PRIORITY PROTECTION ONPUMP EXERCISE ON

30 SEC/2 WK

MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR

THERMOSTATS (24 VAC)

T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3

ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY



24 VAC ZONE VALVES

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK


THERMOSTATS (24 VAC)INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT

T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

PRIORITY

PRIORITY

XX

PUMP ENDSWITCH

XX

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP


See NOTE 2


Powered from Transformer A

A

B

A

B



Powered from Transformer B

See NOTE 1

T T T

T T T

34

2 EXP Zone Valve Controls Connected Together with DHW Pump

24 VAC FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

H

N

BOILER

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

SWITCH SETTINGS



120 VACINPUT

MASTER

SLAVE

DHWPUMP

DRYCONTACTS



1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

PRIORITY

PRIORITY

XX

PUMP ENDSWITCH

XX

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP


See NOTE 2



A

B

A

B




See NOTE 1

T T T

T T T

BOILER TURNS ON WHENANY ZONE VALVE OPENS.

DHW PUMP TURNS ON ONLYWHEN PRIORITY ZONE CALLS.

2 EXP Zone Valve Controls Connected Together with System and DHW Pumps

35

24 VAC FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

H

N

BOILER

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

SWITCH SETTINGS



120 VACINPUT

MASTER

SLAVE

DHWPUMP

DRYCONTACTS



1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

PRIORITY

PRIORITY

XX

PUMP ENDSWITCH

XX

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP


See NOTE 2



A

B

A

B




See NOTE 1

T T T

T T T



SYSTEMPUMP

36

2 EXP Zone Valve Controls Connected Together with System, DHW and Secondary Pumps

24 VAC FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

H

N

BOILER

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

SWITCH SETTINGS



120 VACINPUT

MASTER

SLAVE

DHWPUMP

DRYCONTACTS



1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

PRIORITY

PRIORITY

XX

PUMP ENDSWITCH

XX

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP


See NOTE 2



A

B

A

B




See NOTE 1

T T T

T T T



SECONDARY PUMP COMES ON WHENANY ZONE CALLS EXCEPT PRIORITY ZONE.

SYSTEMPUMP SECONDARY

PUMP

37

PC70

0 Bo

iler R

eset

Con

trol C

onne

cted

To

EXP

Zone

Val

ve C

ontro

l

24

VAC

FACTORYINSTALLED

TRANSFORMER

120

VA

CIN

PUT

WH

ITE

BLA

CK

H N

BO

ILE

R

24

VAC

FACTORYINSTALLED

TRANSFORMER

120

VA

CIN

PUT

WH

ITE

BLA

CK

SWIT

CH

SET

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GS

Mas

ter/

Slav

e: M

aste

rPr

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y Z

one:

On

or O

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Nor

mal

: Res

et

120

VA

CIN

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SYST

EM P

UM

P A

ND

BO

ILER

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RN O

NW

HEN

AN

Y Z

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E VA

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OPE

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SYST

EMPU

MP

DRY

CO

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TO:

BOIL

ER A

QU

AST

AT

RELA

Y

TO:

"TT"

ON

BO

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PUT

12

34

ZO

NE

11

23

4Z

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E 2

12

34

ZO

NE

31

23

4Z

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E 4

12

34

ZO

NE

51

23

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E 6

PRIO

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ZO

NE

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ZO

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ND

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4 W

IRE

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JUM

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-EX

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POWER IN24 VAC

N/O

CO

MN

/C

PUM

P EN

DSW

ITC

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E 6

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CH

SLA

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IOR

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RE

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OS

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UR

GE

ON

PR

IOR

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PR

OTE

CTI

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PU

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EX

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MA

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MA

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HO

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24 V

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DIR

ECT

WA

TER

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TER

AQ

UA

STA

T O

RTH

ERM

OST

AT

T ST

AT

1VA

LVE

1

T ST

AT

2VA

LVE

2

T ST

AT

3VA

LVE

3

T ST

AT

4VA

LVE

4

VALV

E 5

T ST

AT

6VA

LVE

6

POW

ER

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IND

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TORS

T ST

AT

5

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

ZON

E 5

ZON

E 6

NET

EXPA

NSI

ON

MAI

NPR

IORI

TY

XX

XX

AB

CR

WC

RW

CR

WC

RW

CR

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RW

C1

2

END

SW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

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24 V

AC

ZO

NE

VALV

ESPR

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TY

XX

POW

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TRO

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CES

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FUSE

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Tra

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Tra

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24

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11

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12

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31

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12

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51

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E VA

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CO

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E 6

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XX

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S O

N O

NLY

WH

EN P

RIO

RITY

ZO

NE

CA

LLS.

DH

WPU

MP

H N

120

VA

CIN

PUT

39

PC70

5 Va

riabl

e Sp

eed

Pum

p In

ject

ion

Cont

rol C

onne

cted

To

EXP

Zone

Val

ve C

ontro

l

24

VAC

FACTORYINSTALLED

TRANSFORMER

120

VA

CIN

PUT

WH

ITE

BLA

CK

H N

BO

ILE

R

24

VAC

FACTORYINSTALLED

TRANSFORMER

120

VA

CIN

PUT

WH

ITE

BLA

CK

SWIT

CH

SET

TIN

GS

Mas

ter/

Slav

e: M

aste

rPr

iorit

y Z

one:

On

or O

ffRe

set/

Nor

mal

: Res

et

120

VA

CIN

PUT SY

STEM

CIR

CU

LATO

R A

ND

BO

ILER

TU

RN O

NW

HEN

AN

Y Z

ON

E VA

LVE

OPE

NS.

SYST

EM C

IRC

ULA

TOR

(OPT

ION

AL

LOC

ATI

ON

)

DRY

CO

NTA

CTS

TO:

BOIL

ER A

QU

AST

AT

RELA

Y

TO:

"TT"

ON

BO

ILER

WIT

H

D

HW

"TT

" IN

PUT

12

34

ZO

NE

11

23

4Z

ON

E 2

12

34

ZO

NE

31

23

4Z

ON

E 4

12

34

ZO

NE

51

23

4Z

ON

E 6

PRIO

RITY

ZO

NE

2 W

IRE

ZO

NE

VALV

E(N

O E

ND

SW

ITC

H)

MU

ST U

SE JU

MPE

R

TAC

O3

WIR

EZ

ON

E VA

LVE

1 2 3

JUM

PER

3 &

4

MO

TOR

END

SWIT

CH

4 W

IRE

ZO

NE

VALV

E(P

OW

ER O

PEN

,SE

LF C

LOSI

NG

)

JUM

PER

3 &

4

ZVC

406

-EX

P-4

SIX

ZO

NE

EXPA

ND

ABL

EZ

ON

E VA

LVE

CO

NTR

OL

POWER IN24 VAC

N/O

CO

MN

/C

PUM

P EN

DSW

ITC

HZ

ON

E 6

PUM

PEN

D S

WIT

CH

SLA

VE

PR

IOR

ITY

ON

RE

SE

TP

OS

T P

UR

GE

ON

PR

IOR

ITY

PR

OTE

CTI

ON

ON

PU

MP

EX

ER

CIS

E O

N30

SE

C/2

WK

MA

STE

RO

FFN

OR

MA

LO

FFO

FFO

FF4

MIN

/24

HO

UR

THER

MO

STA

TS (

24 V

AC

)IN

DIR

ECT

WA

TER

HEA

TER

AQ

UA

STA

T O

RTH

ERM

OST

AT

T ST

AT

1V

ALV

E 1

T ST

AT

2V

ALV

E 2

T ST

AT

3V

ALV

E 3

T ST

AT

4V

ALV

E 4

VA

LVE

5

T ST

AT

6V

ALV

E 6

POW

ER

LED

IND

ICA

TORS

T ST

AT

5

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

ZON

E 5

ZON

E 6

NET

EXPA

NSI

ON

MAI

NPR

IORI

TY

XX

XX

AB

CR

WC

RW

CR

WC

RW

CR

WC

RW

C1

2

END

SW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

24 V

AC

ZO

NE

VALV

ESPR

IORI

TY

XX

POW

ERC

ON

TRO

LS

AC

CES

SORY

PORT

FUSE

5 A

MP

FUSE

5 A

MP

Pow

ered

from

Tra

nsfo

rmer

A

A B

NO

TE

2:

Whe

n a

circ

ulat

oris

use

d o

n th

e p

riorit

y zo

nein

stea

d o

f a z

one

valv

e,ju

mp

er 3

and

4 o

f the

prio

rity

zone

.

NO

TE

1:

Term

inal

s C

are

for

optio

nal 2

4V t

herm

osta

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MO

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ered

from

Tra

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APo

wer

ed fr

om T

rans

form

er B

Pow

ered

from

Tra

nsfo

rmer

B

See

NO

TE

1

TT

T

ZONE

CONT

ROL

BOIL

SEN

OUT

SEN

BO

ILE

R S

EN

SO

R

OU

TDO

OR

SE

NS

OR

PC

705-

2

SUP

SEN

SU

PP

LY S

EN

SO

R

INJE

CTI

ON

CIR

CU

LATO

R

SYST

EMC

IRC

ULA

TOR

AN

D/O

R BO

ILER

BLA

CK

BLU

E

REDG

REEN

/GRO

UN

D (SEE

NO

TE B

ON

PA

GE

22)

40

PC700 Boiler Reset Control Connected To 2 EXP Zone Valve Controls

24 VAC FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

H

N

BOILER

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

SWITCH SETTINGS


SWITCH SETTINGS


120 VACINPUT

MASTER

SLAVE

DHWPUMP

DRYCONTACTS



1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

PRIORITY

PRIORITY

XX

PUMP ENDSWITCH

XX

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP


See NOTE 2



A

B

A

B




See NOTE 1

T T T

T T T



SYSTEMPUMP

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC700

41

PC702 2–Stage Boiler Reset Control Connected To 2 EXP Zone Valve Controls

24 VAC FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

H

N

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK 24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

SWITCH SETTINGS


SWITCH SETTINGS


120 VACINPUT

MASTER

SLAVE

DHWPUMP

DRYCONTACTS

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

PRIORITY

PRIORITY

XX

PUMP ENDSWITCH

XX

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP


See NOTE 2



A

B

A

B




See NOTE 1

T T T

T T T



SYSTEMPUMP

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC702

STAGE1

STAGE2

BOILER#2

BOILER#1

DHWDEMAND


42

PC705 Variable Speed Pump Injection Control Connected To 2 EXP Zone Valve Controls

24 VAC FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

H

N

BOILER

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

SWITCH SETTINGS


SWITCH SETTINGS


120 VACINPUT

MASTER

SLAVE

DRYCONTACTS

TO:

BOIL

ERA

QU

AST

AT

RELA

Y


1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

PRIORITY

PRIORITY

XX

PUMP ENDSWITCH

XX

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP


See NOTE 2



A

B

A

B




See NOTE 1

T T T

T T T

SYSTEMCIRCULATOR

(OPTIONAL LOCATION)

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC705-2

SUPSEN

SUPPLY SENSOR

INJECTIONCIRCULATOR

SYSTEMCIRCULATOR

BLACK

BLUE

RED

GREEN/GROUND


43

PC700 and PC705 Connected To 2 EXP Zone Valve Controls

24 VAC FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

H

N

BOILER

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

SWITCH SETTINGSMaster/Slave: MasterPriority Zone: On or OffReset/Normal: Reset

SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Reset

120 VACINPUT

MASTER

SLAVE

DHWPUMP

DRYCONTACTS



1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE

2 WIRE ZONE V(NO END SWITCH)MUST USE JUMPER

TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

PRIORITY

PRIORITY

XX

PUMP ENDSWITCH

XX

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP


See NOTE 2



A

B

A

B




See NOTE 1

T T T

T T T

SYSTEM PUMP AND BOILER TURN ONWHEN ANY ZONE VALVE OPENS. SYSTEM

PUMP

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC700

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC705-2

SUPSEN

SUPPLY SENSOR

INJECTIONCIRCULATOR

SYSTEMCIRCULATOR

BLACK

BLUE

RED

GREEN/GROUND



44

PC702 and PC705 Connected To 2 EXP Zone Valve Controls

24 VAC FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

H

N

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK 24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

SWITCH SETTINGS


SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Reset

120 VACINPUT

MASTER

SLAVE

DHWPUMP

DRYCONTACTS

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3




24 VAC ZONE VALVES

PRIORITY

PRIORITY

XX

PUMP ENDSWITCH

XX

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP


See NOTE 2



A

B

A

B




See NOTE 1

T T T

T T T


SYSTEMPUMP

ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC702

STAGE1

STAGE2

BOILER#2

BOILER#1

DHWDEMAND



ZONECONTROL

BOILSEN

OUTSEN

BOILER SENSOR

OUTDOORSENSOR

PC705-2

SUPSEN

SUPPLY SENSOR

INJECTIONCIRCULATOR

SYSTEMCIRCULATOR

BLACK

BLUE

RED

GREEN/GROUND


45

HAFC101-4 with 1 Speed Air Handler

HAFC101-4HYDRO AIR FAN CONTROL

THERMOSTATC R W Y G

AQUASTATT T

HAFC101-4

BOILERC

AIR HANDLERX X R Y GL GH

THERMOSTAT

T

HAFC 101 WITH 1 SPEED AIR HANDLER(Both HFC 101 and HAFC 201 are

capable of 1 and 2 speed applications.)

To: Aquastaton Return Lineof Hydro Coil

Optional Power Wireto Thermostatthat Requires 24VAC

FANRELAY

LIN

E24

VA

C

OUTDOORCONDENSER

UNITDry Contacts To:“T T” on Boileror SwitchingRelay

M

JUMPER

POWER

HEAT CALL

LEDINDICATORS

COOL FAN

HEAT FAN

46



THERMOSTATC R W Y G

AQUASTATT T

HAFC101-4

BOILERC


THERMOSTAT

T



To: Aquastaton Return Lineof Hydro Coil


OUTDOORCONDENSER

UNIT

FANRELAY

LIN

E24

VA

C

LOW

HIG

H

M

Dry Contacts To:“T T” on Boileror SwitchingRelay

POWER

HEAT CALL

LEDINDICATORS

COOL FAN

HEAT FAN

47



THERMOSTAT

POWER

HEAT CALL

LEDINDICATORS

THERMOSTAT

T

C R W Y GAQUASTATS

T T

HAFC201-4

COOL FAN

HEAT FAN

BOILERC


WATERCOIL

FREEZEPROT.

T T

X X

PUMP

1 MIN

FAN

DE

LAY

3 MIN

FAN

DE

LAY

2MIN

/24HR

or 30SE

C/2W

K

PU

MP

EX

ER

CIS

E

OFF O

N



To: OptionalAquastat onReturn Line ofHydro Coil

To: Optional Aquastator Thermostat to senselow ambienttemperature


NOTE: For 4 minuteON DELAY of Heating Fan,switch 1 and 3 MIN ONDELAY to ON position.

FANRELAY

LIN

E24

VA

C

OUTDOORCONDENSER

UNIT

JUMPER

CIRCULATOR(or to “T T” onswitching relay)


H

N

120 VACINPUT

M

48



THERMOSTAT

POWER

HEAT CALL

LEDINDICATORS

THERMOSTAT

T

C R W Y GAQUASTATS

T T

HAFC201-4

COOL FAN

HEAT FAN

BOILERC


WATERCOIL

FREEZEPROT.

T T

X X

PUMP

1 MIN

FAN

DE

LAY

3 MIN

FAN

DE

LAY

2MIN

/24HR

or 30SE

C/2W

K

PU

MP

EX

ER

CIS

E

OFF O

N






NOTE: For 4 minuteON DELAY of Heating Fan,switch 1 and 3 MIN ONDELAY to ON position.

OUTDOORCONDENSER

UNIT

CIRCULATOR(or to “T T” onswitching relay)


H

N

120 VACINPUT

FANRELAY

LIN

E24

VA

C

LOW

HIG

H

M

49

Mul

tiple

HAF

C’s

and

Switc

hing

Rel

ay

TO:

"TT"

ON

BO

ILER

H N

120

VAC

INPU

T

FOU

R Z

ON

E SW

ITC

HIN

G R

ELA

Y

120

VAC

CIR

CU

LATO

RS

ZC

IN

PUT

120

VAC

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

Z

ON

E1 Z

ON

E2 Z

ON

E3

SR 5

04-4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

P

XX

RW

RW

RW

RW

ISO

LATE

DEN

DSW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

ZON

E4

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

ZO

NE

4PR

IORI

TY OFF

ON

PRIO

RITY

24 V

AC

COM

BO

ILE

RIN

DIR

ECT

WA

TER

HEA

TER

AQ

UA

STA

T O

RTH

ERM

OST

AT

JUM

PER

HA

FC10

1-4

HY

DR

O A

IR F

AN

CO

NT

RO

L

THE

RM

OS

TAT

CR

WY

G

AQ

UA

STA

TT

T

HA

FC10

1-4

BO

ILER

CA

IR H

AN

DLE

RX

XR

YG

LG

H

THER

MO

STA

T

TTo

: Aqu

asta

ton

Ret

urn

Line

of H

ydro

Coi

lO

ptio

nal P

ower

Wire

to T

herm

osta

tth

at R

equi

res

24VA

C

OU

TDO

OR

CO

ND

ENSE

RU

NIT

FAN

RELA

Y

LINE24 VAC

LOW

HIGH M

HA

FC10

1-4

HY

DR

O A

IR F

AN

CO

NT

RO

L

THE

RM

OS

TAT

CR

WY

G

AQ

UA

STA

TT

T

HA

FC10

1-4

BO

ILER

CA

IR H

AN

DLE

RX

XR

YG

LG

H

THER

MO

STA

T

TTo

: Aqu

asta

ton

Ret

urn

Line

of H

ydro

Coi

lO

ptio

nal P

ower

Wire

to T

herm

osta

tth

at R

equi

res

24VA

C

OU

TDO

OR

CO

ND

ENSE

RU

NIT

FAN

RELA

Y

LINE24 VAC

LOW

HIGH M

HA

FC10

1-4

HY

DR

O A

IR F

AN

CO

NT

RO

L

THE

RM

OS

TAT

CR

WY

G

AQ

UA

STA

TT

T

HA

FC10

1-4

BO

ILER

CA

IR H

AN

DLE

RX

XR

YG

LG

H

THER

MO

STA

T

TTo

: Aqu

asta

ton

Ret

urn

Line

of H

ydro

Coi

lO

ptio

nal P

ower

Wire

to T

herm

osta

tth

at R

equi

res

24VA

C

OU

TDO

OR

CO

ND

ENSE

RU

NIT

FAN

RELA

Y

LINE24 VAC

LOW

HIGH M

TWO

SPE

ED A

IR H

AN

DLE

RTW

O S

PEED

AIR

HA

ND

LER

TWO

SPE

ED A

IR H

AN

DLE

R

POW

ER

HEA

T C

ALL

LED

IND

ICA

TORS

CO

OL

FAN

HEA

T FA

N

POW

ER

HEA

T C

ALL

LED

IND

ICA

TORS

CO

OL

FAN

HEA

T FA

N

POW

ER

HEA

T C

ALL

LED

IND

ICA

TORS

CO

OL

FAN

HEA

T FA

N

120 VAC INPUT

BOILER

SWITCH SETTINGS

120 VAC INPUTH

N


TO: "TT" ON BOILER

DHWCIRCULATOR

SLAVE(EXISTING CONTROL)

MASTER(NEW CONTROL)




POWERCONTROLS


INPUT120 VAC

ZONE 1 ZONE 2

ZONE 3



THERMOSTATS

SR 506-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE6 ZONE6

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

ZONE 5

ZONE 6

LEDINDICATORS

T


See NOTE 1

FOUR ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY

ZONE 4

ONOFF

PRIORITY

120V RELAY

FUSE 1 AMP

24 VAC

POWER

MASTER

1234 PLUG-IN CARDS

RESET NORMAL

SLAVE

POWERCONTROLINTERFACE



X XEND

SWITCH

ZONE1 ZONE2 ZONE3 ZONE4 POWER

INPUT

SR 504-EXP

ZONE 2

POWERZONE 1

ZONE 3ZONE 4

REMOVEJUMPER

THERMOSTATST

Master/Slave: MasterPriority Zone: OffReset/Normal: Normal


New Expandable Switching Relay Connected to an Older Expandable Switching Relay

50

24 VAC FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

H

N

BOILER

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

SWITCH SETTINGS



120 VACINPUT

MASTER(NEW CONTROL)

SLAVE(EXISTING CONTROL)


SYSTEMPUMP



1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4


POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

ZONE 1 ZONE 2

ZONE 3





XX

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP




A

B

A

B



See NOTE 1


T T T

T T T

ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6

FUSE

7 A

MP

MA

X

T T T T T T T T T T T T

ZONE 6

OFF

ON

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

MODENORMALRESET

PRIORITYZONE

(not used)



123

JUMPER3 & 4

MOTOR ENDSWITCH

4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)

JUMPER3 & 4

1 2 3 4

MASTER

SLAVE

POWERCONTROLS

PLUG-INCARDS PRIORITY

TAC

O, I

NC

ZVC

406-

EXP

T STAT 1

T STAT 2

T STAT 3

T STAT 4

T STAT 5

T STAT 6

POWER ON

VALVE 1

VALVE 2

VALVE 3

VALVE 4

VALVE 5

VALVE 6

EXPANSION

ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL


POW

ER IN

DRYCONTACTS

N/O COMZONE 6 RELAY

N/CEND

SWITCHA

BOILER

ENDSWITCH

BPUMP

SYSTEMPUMP

New Expandable Zone Valve Control Connected to an Older Expandable Zone Valve Control

51

ZVC404-EXP Zone Valve Control Connected to a MOD–CON Boiler

52

SR504-EXP Switching Relay Connected to a MOD–CON Boiler


FOUR ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS


INPUT120 VAC

ZONE 1


ZONE1 ZONE2 ZONE3

THERMOSTATS

SR 504-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE4 ZONE4

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

SPACE HEATER DEMAND

DHW DEMAND

MOD-CONBOILER

DHW PUMPOUTPUT

(NOT USED)

120 VACINPUT

H

N

SPA

CE

HEA

TIN

GPU

MP

OU

TPU

T


NOTE 1: Terminals Care for optional 24Vthermostat COMMONconnections.

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

PRIORITYZONE

2 WIREZONE VALVE

(NO END SWITCH)MUST USE JUMPER

TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH

4 WIREZONE VALVE

(POWER OPEN,SELF CLOSING)

JUMPER3 & 4

POWERCONTROLS

SEE NOTE 2

ZVC 404-EXP-4FOUR ZONE EXPANDABLE

ZONE VALVE CONTROL

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

POW

ER IN

24 V

AC

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

DRYCONTACTS

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK


NOTE 2: When a circulator is usedon the priority zone instead of azone valve, jumper 3 and 4 ofthe priority zone.



T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

POWER

LEDINDICATORS

SPACE HEATER DEMAND

DHW DEMAND

ZONE 1




24 VAC ZONE VALVES

ACCESSORYPORT

PRIORITY

X X

FUSE5 AMP

FUSE5 AMP

Powered fromTransformer A

Powered fromTransformer B

A

B

MOD-CONBOILER

DHW PUMPOUTPUT

(NOT USED)

SPA

CE

HEA

TIN

GPU

MP

OU

TPU

T

120 VACINPUT

HNSPACE HEATING

PUMP




53

TEKM

AR C

omm

unic

atio

n Th

erm

osta

t (TN

4) C

onne

cted

to S

R504

-EXP

Swi

tchi

ng R

elay

TEKM

AR

USE

R SW

ITC

H(O

PTIO

NA

L)

TO: “

TT”

ON

BO

ILER

BOIL

ER

H N

TO: “

TT”

ON

BO

ILER

WIT

HD

HW

“TT

” IN

PUT

R W

C tn

4

R W

C tn

4

R W

C tn

4

R W

C tn

4

tn4 RC

120

VAC

INPU

T

PRIM

ARY

CIR

CU

LATO

R(O

PTIO

NA

L)

FOU

R Z

ON

EEX

PAN

DA

BLE

SWIT

CH

ING

REL

AY

POW

ERC

ON

TRO

LS

120

VAC

CIR

CU

LATO

RSZ

C

INPU

T12

0 VA

C

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

ZON

E1 Z

ON

E2 Z

ON

E3

SR 5

04-E

XP-

4

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

FUSE

6 AM

PFU

SE6

AMP

NET

EXPA

NSI

ON

MAI

NPR

IORI

TY

XX

XX

AB

CR

WC

RW

CR

WC

RW

C1

2

END

SW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

N/C

PRIM

ARY

120

VAC

ZR

HH

NH

NH

NH

NH

NH

NH

NH

SLA

VE

PR

IOR

ITY

ON

RE

SE

T

PR

IMA

RY

PU

MP

ON

PO

ST

PU

RG

E O

N

PR

IOR

ITY

PR

OTE

CT

ON

PU

MP

EX

ER

CIS

E O

N

30 S

EC

/2 W

K

MA

STE

R

OFF

OFF

OFF

OFF

OFF

NO

RM

AL

LOW

LIM

IT (Z

C) O

NO

FF

4 M

IN/2

4 H

OU

R

ZON

E4ZO

NE4

PRIO

RITY

AC

CES

SORY

PORT

ZO

NE

2

POW

ER

ZO

NE

1

ZO

NE

3

ZO

NE

4

LED

IND

ICA

TORS

54

TEKM

AR C

omm

unic

atio

n Th

erm

osta

t (TN

4) C

onne

cted

to Z

VC40

4-EX

P Zo

ne V

alve

Con

trol

12

34

ZO

NE

11

23

4Z

ON

E 2

12

34

ZO

NE

31

23

4Z

ON

E 4

PRIO

RITY

ZO

NE

2 W

IRE

ZO

NE

VALV

E(N

O E

ND

SW

ITC

H)

MU

ST U

SE JU

MPE

R

TAC

O3

WIR

EZ

ON

E VA

LVE

1 2 3

JUM

PER

3 &

4

MO

TOR

END

SWIT

CH

4 W

IRE

ZO

NE

VALV

E(P

OW

ER O

PEN

,SE

LF C

LOSI

NG

)

JUM

PER

3 &

4

POW

ERC

ON

TRO

LS

SE

E N

OTE

2

ZV

C 4

04-E

XP-

4FO

UR

ZO

NE

EXPA

ND

AB

LEZ

ON

E V

ALV

E C

ON

TRO

L

24

VAC

FACTORYINSTALLED

TRANSFORMER

120

VA

CIN

PUT

WH

ITE

BLA

CK

POWER IN24 VAC

24

VAC

FACTORYINSTALLED

TRANSFORMER

120

VA

CIN

PUT

WH

ITE

BLA

CK

DRY

CO

NTA

CTS

N/O

CO

MN

/C

PUM

P EN

DSW

ITC

HZ

ON

E 4

PUM

PEN

D S

WIT

CH

SLA

VE

PR

IOR

ITY

ON

RE

SE

TP

OS

T P

UR

GE

ON

PR

IOR

ITY

PR

OTE

CTI

ON

ON

PU

MP

EX

ER

CIS

E O

N30

SE

C/2

WK

MA

STE

RO

FFN

OR

MA

LO

FFO

FFO

FF4

MIN

/24

HO

UR

NO

TE

2:

Whe

n a

circ

ulat

or is

use

don

the

prio

rity

zone

inst

ead

of a

zone

val

ve, j

ump

er 3

and

4 o

fth

e p

riorit

y zo

ne.

TEKM

AR

USE

RSW

ITC

H

T ST

AT

1VA

LVE

1

T ST

AT

2VA

LVE

2

T ST

AT

3VA

LVE

3

T ST

AT

4VA

LVE

4

POW

ER

LED

IND

ICA

TORS

TO: “

TT”

ON

BO

ILER

ZON

E 1

ZON

E 2

ZON

E 3

ZON

E 4

NET

EXPA

NSI

ON

MAI

NPR

IORI

TY

XX

XX

AB

CR

WC

RW

CR

WC

RW

C1

2

END

SW

ITC

HTH

ERM

OST

ATS

(24

VA

C)

PRIO

RITY

24 V

AC

ZO

NE

VALV

ES

AC

CES

SORY

PORT

PRIO

RITY

XXFU

SE5

AM

P

FUSE

5 A

MP

Pow

ered

from

Tran

sfor

mer

APo

wer

ed fr

omTr

ansf

orm

er B

A B

BOIL

ER

120

VA

CIN

PUTH

NSY

STEM

PU

MP

Pow

ered

from

Tran

sfor

mer

APo

wer

ed fr

omTr

ansf

orm

er B

TO: “

TT”

ON

BO

ILER

WIT

HD

HW

“TT

” IN

PUT

R W

C tn

4

R W

C tn

4

R W

C tn

4

R W

C tn

4

tn4 RC

55

SR503-EXP Switching Relay Controlling a Standard (Non-Expandable) Switching Relay


X XISOLATED

END SWITCH

120 VOLTINPUT

120 VAC INPUTTO: "TT" ON BOILER

ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6PRIORITY

REMOVEJUMPER

H N H N H N H N H N H N


SPAREFUSE

120V RELAY

SPAREFUSE

SIX ZONESWITCHING RELAY WITH PRIORITY

ZONE 6PRIORITY

ONOFF

N H

SR 506

24 VACPOWER

120 VAC INPUT

TO: "TT" ON BOILER


THREE ZONEEXPANDABLE SWITCHING RELAY

POWERCONTROLS

120 VAC CIRCULATORS

ZC INPUT

120 VAC


ZONE1 ZONE2


SR 503-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP


X X X X A B C R W C R W C R W C 1 2

END SWITCH THERMOSTATS

PRIORITY N/CPRIMARY

120 VACZR

H H N H N H N H N H N H N H

SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE3 ZONE3

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

LEDINDICATORS

THERMOSTATS(24 VAC)

BOILER

MASTER

SLAVE

AQUASTAT ONDHW HEATERA

H

N

(EXISTING CONTROL)


56

ZVC404-EXP Zone Valve Control Controlling a Standard (Non-Expandable) Switching Relay

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

PRIORITYZONE

2 WIREZONE VALVE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH

4 WIREZONE VALVE


JUMPER3 & 4

POWERCONTROLS

SEE NOTE 2


ZONE VALVE CONTROL

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

POW

ER IN

24 V

AC

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK





T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

POWER

LEDINDICATORS

ZONE 1




24 VAC ZONE VALVES

ACCESSORYPORT

PRIORITY

X X

FUSE5 AMP

FUSE5 AMP



A

B

ZONEVALVEPUMP




X XISOLATED

END SWITCH

120 VOLTINPUT

120 VACINPUT

TO: "TT" ON BOILER


REMOVEJUMPER

H N H N H N H N H N H N


SPAREFUSE

120V RELAY

SPAREFUSE

SIX ZONESWITCHING RELAY WITH PRIORITY

ZONE 6PRIORITY

ONOFF

N H

SR 506

24 VACPOWER

120 VAC INPUT

THERMOSTATS(24 VAC)

BOILER

SLAVE

HN

(EXISTING CONTROL)

PRIORITYOFF

MASTERTO: “TT” ON BOILER

TO: “TT” ON BOILER WITHDHW “TT” INPUT


57

ZVC404-EXP Zone Valve Control Controlling a Standard (Non-Expandable) Zone Valve Control

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

PRIORITYZONE

2 WIREZONE VALVE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH

4 WIREZONE VALVE


JUMPER3 & 4

POWERCONTROLS

SEE NOTE 2


ZONE VALVE CONTROL

POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK





T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

POWER

LEDINDICATORS

ZONE 1




24 VAC ZONE VALVES

ACCESSORYPORT

PRIORITY

X X

FUSE5 AMP

FUSE5 AMP



A

B

ZONE VALVE PUMP(MASTER)



BOILER

SLAVE (EXISTING CONTROL)

MASTERTO: “TT” ON BOILER

TO: “TT” ON BOILER WITHDHW “TT” INPUT

POWER IN


MODENORMAL RESET

FUSE (3 A

MP M

AX

)


ZONE 4 PRIORITYOFF

ON

N/O COM N/CZONE 4 RELAY

DRYCONTACTS

1 2 3 4 1 2 3 4ZONE 1 ZONE 2


JUMPER3 & 4


123

1 2 3 4ZONE 3

MOTOR ENDSWITCH


T STAT 1

VALVE 1T STAT 2VALVE 2T STAT 3

VALVE 3T STAT 4VALVE 4POWER

ENDSWITCH

EXTRAEND

SWITCH

MAIN

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

ZVC 404

FOUR ZONE ZONE VALVE CONTROL


1 2 3 4ZONE 4

PRIORITYZONE

JUMPER3 & 4

SEE NOTE 2


120 VACINPUT

HN


PRIORITYON

ZONE VALVE PUMP(SLAVE)

TO: “TT” ON BOILER

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

24 VAC

24 VAC

120 VACINPUT

WHITE

BLACK

120 VACINPUT

WHITE

BLACK


58

3 Wire Thermostat Connected to TACO Non-Expandable Switching Relay

TO: "TT" ON BOILER

HN

120 VACINPUT


120 VAC CIRCULATORS

ZC INPUT

120 VAC


ZONE1 ZONE2 ZONE3

SR 504-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP



PRIORITY120 VACZR


ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

LEDINDICATORS

ZONE 4PRIORITY

OFF

ON

PRIORITY

24 VAC

COM

BOILER

JUMPER

T

T

T

THERMOSTATS

T

3 WIRETHERMOSTAT

COM

570 Zone Valve Connected to TACO Switching Relay

T

1

2

3

24 VACTRANSFORMER

THERMOSTAT

120 VAC INPUT

THREE ZONE SWITCHING RELAY

120 VAC CIRCULATORS

ZC INPUT

120 VAC

ZONE 1 ZONE 2 ZONE 3PRIORITY

ZONE1 ZONE2 ZONE3PRIORITY

SR 503-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

X X R W R W R WISOLATED


120 VAC

ZR

H H N H N H N H N H

ZONE 2

POWER

ZONE 1

ZONE 3

LEDINDICATORS

ZONE 3PRIORITY

OFF

ON

TO: "TT" ON AQUASTAT CONTROL

24 VAC

COM

JUMPER

59

Whi

te-R

oger

s 13

61 H

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Val

ve w

ith T

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ve C

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11

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12

34

ZO

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31

23

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5

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ITE-

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L

24

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VA

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PUT

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ITE

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CK

POWER IN24 VAC

24

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120

VA

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TOC

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TY OFF

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NO

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Tra

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Tra

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24

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FACTORYINSTALLED

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120

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PUT

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ITE

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CK

POWER IN24 VAC

24

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FACTORYINSTALLED

TRANSFORMER

120

VA

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PUT

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ITE

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TOC

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MP Z

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Tra

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61

Zone

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g Pr

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WH

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12

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11

23

4Z

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E 2

12

34

ZO

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31

23

4Z

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E 4

12

34

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23

4Z

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E 6

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PER

3 &

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IRE

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PEN

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NG

)

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PER

3 &

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ZO

NE

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NE

VALV

E C

ON

TRO

L

24

VAC

FACTORYINSTALLED

TRANSFORMER

120

VA

CIN

PUT

WH

ITE

BLA

CK

POWER IN24 VAC

24

VAC

FACTORYINSTALLED

TRANSFORMER

120

VA

CIN

PUT

WH

ITE

BLA

CK

DRY

CO

NTA

CTS

N/O

CO

MN

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PUM

P EN

DSW

ITC

HZ

ON

E 6

PUM

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D S

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CH

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TS (

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T ST

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1

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2VA

LVE

2

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AT

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3

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4

VALV

E 5

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TO: B

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TY OFF

ON

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2:

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IND

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TW

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R H

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from

Tra

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from

Tra

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TT

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PRIO

RITY

ON

PPRIORITYPOWER IN

H

(on)

MA

STER

CIR

C.

ON

RW

XX

RC

THER

MO

-ST

AT

END

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CH

24 V

AC

POW

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N

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E(P

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20 V

AC

INPU

T

Back ofControl

MENU ITEM

RADIANT MIXING BLOCK

PATENT PENDING RMB-1UL

Power: 120 V + 10%50/60 Hz, 750 VAVar. Speed: 120 V(ac) 1 APmp Relay: 120 V(ac) 5 A, 1/6 hp

Use copperconductors only

Meets Class B:Canadian ICESFCC Part 15

Com SysRet

Boil Out HeatDem

Boiler

HN

C US158033

Com Com

Sys

Y R BMan

R

SupplySensor

BoilerSensor

OutdoorSensor

Boiler

InjectionCirculator

RadiantCirculator

Line Cord

To Zone

Control End

Switchor

Thermostat

Off-Enable On-ControlBoiler Operation

Sup

Var

Pump

Fuse

Front ofControl

SupplySensor

Boiler Sensor

Outdoor

SensorH

N

ComSup Boil Out HeatDem

Com Com

Boiler

SysRet

RMBBack of Control

H

N

Power

Input

Thermostat

(Dry Contact)

N


Pump

High Mass Boiler

T

Radiant Mixing Block, Single Zone

Radiant Mixing Block (RMB)

FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard62

Radiant Mixing Block Connected to Zone Valve Control with System Pump Wired off the RMB

Radiant Mixing Block Connected to 2 EXP Switching Relays with DHW Pump

SupplySensor

Boiler Sensor

MM

H

N

Com Sup Boil Out HeatDem

Com Com

Boiler

SysRet

RMBBack of Control

Power

Input

N


Fact

ory

Inst

alle

dTr

ansf

orm

er

Pump

Outdoor

Sensor

H

N

Moto

r

End S

witch

Moto

r

End S

witch

Boiler Sensor

SupplySensor

H

N


Com Com

Boiler

SysRet

RMBBack of Control


Power Cord

Pump

HN

Power

Input

DHWCirc.

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

PRIORITYZONE

JUMPER3 & 4

ZVC 403 – 4

THREE ZONEZONE VALVE CONTROL

WHITE

BLACK

POW

ER IN

24 V

AC

TOCIRCULATOR

DRYCONTACTS

N/O COM N/C

PUMP ENDSWITCH

FUSE

5 A

MP


THERMOSTATS (24VAC)

T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

POWER

LEDINDICATORS




X X

ZONE 3PRIORITY

OFF

ON

NOTE 2: When a circulator isused on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.


C C C

THREE ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS

120 VAC CIRCULATORS

ZC INPUT

120 VAC


ZONE1 ZONE2

THERMOSTATS(24 VAC)

SR 503-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE3 ZONE3

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

LEDINDICATORS

TT

T

T

THREE ZONEEXPANDABLE

SWITCHING RELAY

POWERCONTROLS

120 VAC CIRCULATORS

ZC INPUT

120 VAC


ZONE1 ZONE2

THERMOSTATS(24 VAC)

SR 503-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE3 ZONE3

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

LEDINDICATORS

T

T


OutdoorSensor

MASTER

SLAVE

See NOTE 1

See NOTE 1



Back ofControl

MENU ITEM

X – PUMP BLOCK

PATENT PENDING XPB-1UL

Power: 120 V + 10%50/60 Hz, 750 VAVar. Speed: 120 V(ac) 1 APmp Relay: 120 V(ac) 5 A, 1/6 hp

Use copperconductors only

Meets Class B:Canadian ICESFCC Part 15

Com SysRet

Boil Out HeatDem

BoilerHN

C US158033

Com Com

Sys

Y R BMan

R

SystemSupplySensor

HeatSourceSensor

OutdoorSensor

Heat Source

Variable Speed CirculatorHeating: Heat Source CirculatorSnowmelt: System Circulator

Constant Speed CirculatorHeating: System CirculatorSnowmelt: Heat Source Circulator

Line Cord

To Zone

Control End Switch

or Thermostat

(Relay orMechanical

Type)


Sup

Var

Pump

Fuse

Front ofControl

ManualOperationSwitch

X - Pump Block, Single Zone

Input from

Heat Source

Output to

System

HEAT

SOURCE Supply

Sensor

Exp

Tank

Pressure

Relief

H

N


Com ComSysRet

XPBBack of Control

Off-Enable On-Control

Boiler Operation

Power

Cord

Thermostat

(Relay or Mechanical Type)Pump

Outdoor

Sensor

Boiler

T

X - Pump Block (XPB)


65

H

N


Com ComSysRet

Power

Cord

Radiant Manifold - Supply

Radiant Manifold - Return

X - Pump Block Connected to Zone Valve Control

Output to

System

Exp

Tank

Pressure

Relief

Supply

Sensor

XPBBack of Control


Pump

Outdoor

Sensor

Boiler

HEAT

SOURCEInput from

Heat Source

H

N


Com ComSysRet

PowerInput

Power

Cord

Input fromHeat Source

Output to System

SupplySensor

ReturnSensor

ExpTank

PressureRelief

X - Pump Block Connected to 2 SR502/503 Switching Relays

XPBBack of Control


Pump

Outdoor

Sensor

Boiler

H

N

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

PRIORITYZONE

JUMPER3 & 4

ZVC 404 – 4


FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK POW

ER IN

24 V

AC

TOCIRCULATOR

DRYCONTACTS

N/O COM N/C

PUMP ENDSWITCH

FUSE

5 A

MP


T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

POWER

LEDINDICATORS




X X

ZONE 4PRIORITY

OFF

ON


THERMOSTATS (24VAC)

R W R W R WC C C

See NOTE 1

R W C


HN

PRIORITYOFF

T T T

TTTHERMOSTATS

TWO ZONE SWITCHING RELAY

CIRCULATORS

ZC INPUT

120 VAC

ZONE 1 ZONE 2PRIORITY

ZONE1 ZONE2

PRIORITY

SR 502-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

X X R W R WISOLATED

ENDSWITCH THERMOSTATS

120 VAC

ZR

H H N H N H N H

ZONE 2

POWER

ZONE 1

LEDINDICATORS

ZONE 2PRIORITY

OFF

ON24 VAC

COM

PRIORITYOFF

Power

Input

H

N

TT

THERMOSTATS

TWO ZONE SWITCHING RELAY

CIRCULATORS

ZC INPUT

120 VAC

ZONE 1 ZONE 2PRIORITY

ZONE1 ZONE2

PRIORITY

SR 502-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

X X R W R WISOLATED

ENDSWITCH THERMOSTATS

120 VAC

ZR

H H N H N H N H

ZONE 2

POWER

ZONE 1

LEDINDICATORS

ZONE 2PRIORITY

OFF

ON24 VAC

COM

PRIORITYOFF

FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard

Typical Radiant Floor to Water Heater Installation

ColdSupply

MIXH

C

ASSE 1017Tempering

Valve

DomesticHot

Supply

RADIANTSYSTEM

(Secondary Sideof the System)

X-PUMPBLOCK

ColdHot

WATERHEATER

CheckValve

Supply

Return

Exp.Tank

ReliefValve

AirSeparator

WARNING! A pressure relief valve and expansion tank must be installed on the secondaryside in addition to any pressure relief valve and expansion tank which is installed on primaryside of system. Use dedicated supply and return piping to the X-Pump Block from the waterheater so as not to add heated water into the house’s cold water piping.

Typical Snow Melt Installation

SNOW MELTSYSTEM

X-PUMPBLOCK

Supply

Return

Exp.Tank

ReliefValve

AirSeparator

Exp.Tank

Separator

FIXED SPEEDCIRCULATOR(4 PIN PLUG)

VARIABLE SPEEDCIRCULATOR(3 PIN PLUG)

HEATSOURCE

(Tb)

(Ts)

Note 1: There must be no more than 4 pipe diameters between the tees in the boiler andsystem loops in order to prevent ghost flow when the variable speed injectionpump is off and either the boiler pump or system pump is on.

Note 2: There must be at least 6 pipe diameters of straight pipe on either side of the tees inorder to prevent the momentum of water in the boiler and system loops from pushingflow through the injection loop.

Note 3: There should be a minimum 1 foot drop to create a thermal trap in order to preventconvective heat transfer through the injection loop.

(ΔTs)

{Note 1 Note 2

Not

e 3

{

{

Not

e 3

{

Not

e 2

{

Not

e 1

}

HEAT SOURCERETURN SENSOR

(OPTIONAL)

SYSTEMSUPPLYSENSOR

SYSTEMRETURNSENSOR

Tb = Boiler Supply Temperature

Ts = System Supply Temperature

ΔTs = System Temperature Drop(typically 20°F for convectorsand 10°F for radiant floor heating)

66

67

Back ofControl

iSeries-R

BA

24 Volt

Transformer

N

H Power

Input

C R

24 VACPOWER INPUT

SENSOR COMMON

BOILER SUPPLY OUTDOOR

POWERGREEN

SENSORERROR

RED

BACK OF iVALVE-R MIXING VALVE ACTUATOR

iValve, 2-Way Injection, Single Zone

Outdoor

Sensor

Supply

SensorBoiler

Sensor

T

EndSwitch

OutdoorSensor

SystemSupplySensor

BoilerReturnSensor

SENSOR COMMON

C R

24 VACPOWER INPUT

BOILERPOWERGREEN

SENSORERROR

RED

SUPPLY

OUTDOOR

iSeries Mixing Valve

iValve-R

SystemSupplySensor

BoilerReturnSensor(optional)

24 V (ac)Transformer

(Constant Power)

iValve-S

or

Back ofControl

EndSwitch

SENSOR COMMON

C R

24 VACPOWER INPUT

BOILERPOWERGREEN

SENSORERROR

RED

SUPPLY

SETBACK

24 V (ac)Transformer

(Constant Power)

orSetback

Input


SR 501-4

FUSE6 AMP

POWER

ZONE 1

LEDINDICATORS

FUSE6 AMP

N H 3 4 4 56 6N/O N/ON/C N/CCOM COM

120 VACINPUT

T T COM

R W 24VAC

THERMOSTAT

FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard

iSe

ries-R

BC

A

BC

ASupply

Sensor

H N

Power

Input

C R

24 VACPOWER INPUT

SENSOR COMMON


POWERGREEN

SENSORERROR

RED


DHWCirc.

iValve, 3-Way Mixing Working with SR502/503 Switching Relay with DHW Priority

24 V

olt

Tran

sfor

mer

C R

24 VACPOWER INPUT

SENSOR COMMON


POWERGREEN

SENSORERROR

RED


MM

H

N

iValve, 4-Way Mixing Working with Zone Valve Control

iSeries-R

Fact

ory

Inst

alle

dTr

ansf

orm

er

T T

Mot

or

End

Sw

itch

Mot

or

End

Sw

itch

PowerInput

OutdoorSensor

BoilerSensor

SupplySensor

Boiler

Sensor

THREE ZONE SWITCHING RELAY

120 VAC CIRCULATORS

ZC INPUT

120 VAC

ZONE 1 ZONE 2 ZONE 3PRIORITY

ZONE1 ZONE2 ZONE3

PRIORITY

SR 503-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

X X R W R W R WISOLATED


120 VAC

ZR

H H N H N H N H N H

ZONE 2

POWER

ZONE 1

ZONE 3

LEDINDICATORS

ZONE 3PRIORITY

OFF

ON24 VAC

COM

24 V

olt

Tran

sfor

mer

OutdoorSensor

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

PRIORITYZONE

JUMPER3 & 4

ZVC 403 – 4

THREE ZONEZONE VALVE CONTROL

POW

ER IN

24 V

AC

TOCIRCULATOR

N/O COM N/C

PUMP ENDSWITCH

FUSE

5 A

MP


THERMOSTATS (24VAC)

T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

POWER

LEDINDICATORS




X X

ZONE 3PRIORITY

OFF

ON

NOTE 2: When a circulator isused on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.


C C C

See NOTE 1

T T

24 VAC

WHITE

BLACK

THERMOSTATS(24VAC)

INDIRECTWATER HEATERAQUATSTAT ORTHERMOSTAT

See NOTE 2


69

Wiring for Boilers with Honeywell Control Center Model R8285 or Equivalent

TACO LTR0243T-1

YELREDWH YELGRNFACTORYWIRING

MALECONNECTOR

GROUNDCONNECTION

FEMALECONNECTOR

GASVALVE

120VAC

TACO LTR0243T-1

YELREDWH YELGRN

LIMITCONTROLS

24 VACCLASS 2

TRANSFORMER

24 VAC

HOT

COMMON

AlternateWiring

INTEGRATED BOILERCONTROL

BOILER MODULEWIRING HARNESS

MALECONNECTOR

FEMALECONNECTOR

FACTORY WIRING

Wiring Boilers with a United Technologies Integrated Control Module and a Taco LTR0243U-1

Wiring Boilers with a United Technologies Ucontrol or other Integrated Control Moduleswhich accept a 4-pin harness and a Taco LTR0243L-1

4-PIN CONNECTOR (#2)

4-PIN CONNECTOR (#1)

WIRING HARNESS

INTEGRATEDCONTROLMODULE

Wiring Instructions

1. Plug the 4-pin connector on the wiring harness (#1 as shown) into the integrated control module.

2. Plug the 4-pin connector on the wiring harness (#2 as shown) into the LTR.

70

71

Wiring Taco LN and LTA-2 Series Low Water CutoffsUsing Burner Circuit Power Source

*

*Factory Installed

Wiring Taco LN and LTA-2 Series Low Water CutoffsUsing Power Source Other Than Burner Circuit

NOTE: For 24 VAC models, LNA024xx and LTA0243S-2, 24 VAC tobe supplied by an EXTERNAL Class 2 power source to terminalsH and N. For 120 VAC models, LNA120xx and LTA1203S-2, 120 VACis supplied by an external circuit to terminals H and N.

NOTE: For 24 VAC models, LNA024xx and LTA0243S-2, 24 VAC tobe supplied by an EXTERNAL Class 2 power source to terminalsH and N. For 120 VAC models, LNA120xx and LTA1203S-2, 120 VACis supplied by an external circuit to terminals H and N.

Wiring Taco LT Series (1st generation, -1) Low Water CutoffsUsing Burner Circuit Power Source

**Factory Installed

Wiring Taco LT Series (1st generation, -1) Low Water CutoffsUsing Power Source Other Than Burner Circuit

NOTE: For 24 VAC models, LTx024xx-1, 24 VAC to be suppliedby an EXTERNAL Class 2 power source to terminals H and N.For 120 VAC models, LTx120xx-1, 120 VAC is supplied by anexternal circuit to terminals H and N.

NOTE: For 24 VAC models, LTx024xx-1, 24 VAC to be suppliedby an EXTERNAL Class 2 power source to terminals H and N.For 120 VAC models, LTx120xx-1, 120 VAC is supplied by anexternal circuit to terminals H and N.

72

73

Wiring Taco LF Series Low Water Cutoffs Using Burner Circuit Power Source

Wiring Taco LF Series Low Water Cutoffs Using Power Source Other Than Burner Circuit

NOTE: Remote probe available on remote probe models only.

NOTE: For 24 VAC models, LFx024xx, 24 VAC to be supplied by an EXTERNAL Class 2 power source to terminals H and N.For 120 VAC models, LFx120xx, 120 VAC is supplied by an external circuit to terminals H and N.

NOTE: For 24 VAC models, LFx024xx, 24 VAC to be supplied by an EXTERNAL Class 2 power source to terminals H and N.For 120 VAC models, LFx120xx, 120 VAC is supplied by an external circuit to terminals H and N.

Taco Low Water Cutoff Replacement Guide

Bold / Italics Indicates Discontinued Part Number

Taco McDonnell & Miller Hydrolevel Honeywell

LFA1203S-1LTA1203N-1LTA1203S-1

PS-801-120PS-800-120PS-850-120900900C

450CG450650650SVOEM170COEM170TD

RW700A1031RW700A1056RW700A1080

LFM1203S-1LTM1203N-1LTM1203S-1

PS-801-M-120PS-851-M-120PS-851-SP-M-120PS-850-M-120900M901M902M

550550SV750OEM170MCOEM170M

RW700B1054RW700B1039RW700B1021

LFA0243S-1LTA0243N-1LTA0243S-1

PS-802-24PS-800-24PS-850-24

400CG400600600SVOEM24COEM24TD

RW700A1098

LFM0243S-1LTM0243N-1LTM0243S-1

PS-802-M-24PS-852-M-24PS-852-SP-M-24PS-850-M-24

500500SV700OEM24MC

LFA1203R-1LTA1203R-1

750-T-120750-120

650R

LFM1203R-1LTM1203R-1

750-MT-120750-M-120

550R


PS-851-RX2-120 650R

LFM1202R-1LTM1202R-1

PS-851-M-RX2-120 550R


PS-802-RX2-24 400R

LTR0243T-1LTA0243S-2LNA0243S-1

RB-24ERB-24

24SV1100

LTA1203S-2LNA1203S-1

RB-120RB-122EPS-851-120PS-851-SP-120PS-852-24PS-852-SP-24750P-MT-120750P-MT-U-120901RB-120IIRB-122

170SV1150OEM170

RW700A1007RW700A1006

P3R-1RS-1-LPRS-1-LP-S

EWF120WF2-U-120VWF-2-120WF-4-120

VRTX-120V-120-1&2 VW400A1004

EWF024WF2-U-24VWF-2-24WF-4-24

VRTX-24V-24-1&2 VW800A1004

74

75

Taco LF Series 120 Volt LWCO Competitive Wiring Cross Reference

120 VAC Models with 120 VAC Burner Circuits

TACO LFx120x

NC COMNO H N GND P

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

McDONNELL & MILLERPS-801/851-120

w/Red & Amber LEDsSeries 750

1 2 3 4 5

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

HYDROLEVEL450, 550, 650 & 750

2 1 P1 P2 A

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

N H C W B

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT


w/Red & Green LEDs

FACTORYINSTALLED

JUMPER


TACO LFx120x

NC COMNO H N GND P

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT


w/Red & Amber LEDsSeries 750

1 2 3 4 5

HYDROLEVEL450, 550, 650 & 750

2 1 P1 P2 A

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

N H C W B


w/Red & Green LEDs

24 VACTRANSFORMER

24 VACTRANSFORMER

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

24 VACTRANSFORMER

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

24 VACTRANSFORMER

Taco LF Series 24 Volt LWCO Competitive Wiring Cross Reference


TACO LFx024x

NC COMNO H N GND P

BURNERCIRCUIT

HOT

NEUTRAL

24 VACCIRCUIT

HYDROLEVEL400, 500, 600 & 700

2 1 P1 P2 A

BURNERCIRCUIT

HOT

NEUTRAL

24 VACCIRCUIT

N H C W B

BURNERCIRCUIT

HOT

NEUTRAL

24 VACCIRCUIT


FACTORYINSTALLED

JUMPER


TACO LFx024x

NC COMNO H N GND P

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

HYDROLEVEL400, 500, 600 & 700

2 1 P1 P2 A

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

N H C W B


24 VACTRANSFORMER

24 VACTRANSFORMER

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

24 VACTRANSFORMER

76

77

Taco LTA-2 Series 120 Volt LWCO Competitive Wiring Cross Reference


TACO LTA1203S-2

N H COM NC NO

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

RB-120

1 2 3 4 5

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

RB-122E

N H B C

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

GN H P1 P2 A

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

HYDROLEVEL 170McDONNELL & MILLER

FACTORYINSTALLED

JUMPER

McDONNELL & MILLER

H NCUT-OFF

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

HYDROLEVEL 1150


TACO LTA1203S-2

N H COM NC NO

RB-120

1 2 3 4 5

RB-122E

N H B C GN H P1 P2 A

HYDROLEVEL 170SV

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

24 VACTRANSFORMER

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

24 VACTRANSFORMER

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

24 VACTRANSFORMER

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

24 VACTRANSFORMER

McDONNELL & MILLER

McDONNELL & MILLER

H NCUT-OFF

HYDROLEVEL 1150

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

24 VACTRANSFORMER

Taco LTR and LTA-2 Series 24 Volt LWCO Competitive Wiring Cross Reference


TACO LTA0243S-2

N H COM NC NO

BURNERCIRCUIT

HOT

NEUTRAL

24 VACCIRCUIT

RB-24E

BURNERCIRCUIT

HOT

NEUTRAL

24 VACCIRCUIT

HYDROLEVEL 1100

BURNERCIRCUIT

HOT

NEUTRAL

24 VACCIRCUIT

YellowWire

YellowWire

WhiteWire

RedWire

YellowWire

YellowWire

WhiteWire

RedWire

McDONNELL & MILLER

FACTORYINSTALLED

JUMPER

TACO LTR0243T-1

BURNERCIRCUIT

HOT

NEUTRAL

24 VACCIRCUIT

YellowWire

YellowWire

WhiteWire

RedWire

2 1 P1 P2 A

BURNERCIRCUIT

HOT

NEUTRAL

24 VACCIRCUIT

JUMPER

HYDROLEVEL 24


TACO LTA0243S-2

N H COM NC NO

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

24 VACTRANSFORMER

HYDROLEVEL 24

2 1 P1 P2 A

BURNERCIRCUIT

HOT

NEUTRAL

120 VACCIRCUIT

24 VACTRANSFORMER

78

79

Wiring Taco LF Series Low Water Cutoffsto Taco Electric Water Feeder with the Same Voltages

NC NO COM H N

T a c o L F x 1 2 0 x / L F x 0 2 4 x

GND P

B U R N E RC I R C U I T

H O T

N E U T R A L

HN

T a c o E W F 1 2 0 / E W F 0 2 4

LW

1 2 0 V A C / 2 4 V A C

C IR C U IT

EWF Standard Wiring

FACTORYINSTALLED

JUMPER

Wiring Taco LF Series Low Water Cutoffsto Taco Electric Water Feeder with Different Burner Voltages

NC NO H N

Taco L F x1 2 0 x

GND P

B UR NE RCIRC UIT 12 0 V A C

C IR C U IT

HO T

NE U TR AL

H N

Ta co E W F0 24

LW24 V AC

C IR C U IT

HO T

NE U TR AL

Taco LFx 02 4 x

B UR NE RCIRC UIT

12 0 V A CC IR C U IT

HO T

NE U TR AL

H N

Ta co E W F1 20

LW

24 V ACC IR C U IT

HO T

NE U TR AL

* *

* N O T E : R em o ve f ac tor y i n s ta lled

ju m per b etw een H and C O M te rm in a ls

EWF Alternate Wiring

NC COMNO H N GND PCOM

Wiring Taco 24VAC Electric Water Feeder to Taco LF Series 24VAC Low Water Cutoffor 24VAC McDonnell & Miller or Hydrolevel Low Water Cutoffs

Taco LFx024x

Taco EW F 024

NC H N GND P

BURNERCIRCUIT

HOT

NEUTRAL

HNLW

24 V A CC IR C U IT

21P2H ydro level400, 50 0, 600, & 700

NHB M cDo nnel l & M il l er

P S-802 /852-24

NO TE : Wiring shown only for controland burner circuits of the sam evoltage. Som e term ina l designationsare not in their actual order on theLW COs.

** May be factory installed onsom e LW COsINSTALLED

JUMPER **

COMNO

P1A

CW

Wiring Taco 120VAC Electric Water Feeder to Taco LF Series 120VAC Low Water Cutoffor 120VAC McDonnell & Miller or Hydrolevel Low Water Cutoffs

NC NO H N GND P

BURNERCIRCUIT

HOT

NEUTRAL

HNLW

120 V A CC IR C U IT

NHWBM cDo n n ell & Mill er

P S-801 /851-120w /R ed & G r een L E D s

1 245M cDo n n ell & Mill er

P S-801 /851-120 w /Red &Am be r LE D s , S eries 750

21P2 AH ydro level450, 55 0, 650, & 750

Taco LFx120x

Taco EW F 120

NO TE : Wiring shown only for controland burner circuits of the sam evoltage. Som e term ina l designationsare not in their actual order on theLW COs.

** May be factory installed onsom e LW COs

INSTALLEDJUMPER **

COM

C

3

P1

80

81

Wiring TACO LTA-2 or LF Series 24VAC Low Water Cutoff toMcDonnell & Miller Series WF2 Uni-Match Electric Water Feeder

UNI-MATCHWATER FEEDER

MODEL WF2-U-24

24VACSUPPLY

50/60 HzH

N

N H COM NC NOAC POWER OUTPUT CONTACTS

N HW

1 2 3

BURNER

SWITCH POSITION #2

M&M23

0R

Remove jumper between H and COM if using power sourceother than burner circuit or when using mixed voltages.

Do not connect feeder to a manual reset LWCO.

Note on switch position:

Switch setting 1 (M&M), the feed cycle repeats indefinitely. Position 2 and 3 gives one feed cycle.

If using the LTA-2 series, choose whichever position best matches the application:

WF-2 switch to position 1- 60 sec. delay, 90 sec. feed, repeats

WF-2 switch to position 2- 90 sec. delay, 90 sec. feed


Wiring TACO LTA-2 or LF Series 120VAC Low Water Cutoff toMcDonnell & Miller Series WF2 Uni-Match Electric Water Feeder

UNI-MATCHWATER FEEDER

MODEL WF2-U-120

120VACSUPPLY

50/60 Hz H

N


N HW

1 2 3

BURNER

SWITCH POSITION #2

M&M23

0R

Note on switch position:

Switch setting 1 (M&M), the feed cycle repeats indefinitely. Position 2 and 3 gives one feed cycle.

If using the LTA-2 series, choose whichever position best matches the application:

WF-2 switch to position 1- 60 sec. delay, 90 sec. feed, repeats



24 VAC LWCO Using Burner Circuit Power Source

Remove jumper between H and COM if using power sourceother than burner circuit or when using mixed voltages.



Wiring TACO LF Series 24VAC Low Water Cutoff toHydrolevel VXT-24 Water Feeder (Non-Display Model)

SAFGARD VXT-24WATER FEEDER

24VACSUPPLY

50/60 Hz H

N


BURNER

Set Safgard as desired.

WHITE BLACK

Remove jumper between H and COM if usingpower source other than burner circuitor when using mixed voltages.


Wiring TACO LF Series 120VAC Low Water Cutoff toHydrolevel VXT-120 Water Feeder (Non-Display Model)

SAFGARD VXT-120WATER FEEDER

120VACSUPPLY

50/60 Hz H

N


BURNER


WHITE BLACK





82

83

Wiring TACO LTA-2 or LF Series 24VAC Low Water Cutoff toHydrolevel VXT-24 Programmable Water Feeder (Model with Display)

SAFGARD VRTX-24WATER FEEDER

24VACSUPPLY

50/60 Hz H

N


BURNER


WHITE REDBLACK



Wiring TACO LTA-2 or LF Series 120VAC Low Water Cutoff toHydrolevel VXT-120 Programmable Water Feeder (Model with Display)

SAFGARD VRTX-120WATER FEEDER

120VACSUPPLY

50/60 Hz H

N


BURNER


WHITE REDBLACK





Man

ufac

ture

rD

evic

e o

r S

erie

sP

ow

er C

onn

ecti

ons

Out

put

Co

ntac

tsR

emo

te P

rob

es

Ho

tN

eutr

alC

om

mo

nTo

Bur

ner

Cir

cuit

To E

WF’

s LW

Term

inal

/Ala

rmP

rob

eP

rob

eP

refe

renc

e

Taco

LF &

LT-

1 S

erie

sH

NC

OM

NC

NO

PG

ND

Taco

LTA

-2 &

LN

Ser

ies

HN

CO

MN

CN

O—

—

Taco

LTR

Ser

ies

Red

Wire

Whi

te W

ireYe

llow

Wire

Yello

w W

ire—

——

McD

onne

ll &

Mill

erP

S-8

01/8

51 (O

lder

Mod

els

w/R

ed &

Am

ber

LE

Ds)

12

35

4P

or

J2C

hass

is G

ND

McD

onne

ll &

Mill

erP

S-8

01/8

51 (N

ew M

odel

sw

/Red

& G

reen

LE

Ds)

HN

CB

WJ2

Cha

ssis

GN

D

McD

onne

ll &

Mill

erP

S-8

02/8

52 (O

lder

Mod

els

w/R

ed &

Am

ber

LE

Ds)

HN

CB

WJ7

Cha

ssis

GN

D

McD

onne

ll &

Mill

erP

S-8

02/8

52 (O

lder

Mod

els

w/R

ed &

Gre

en L

ED

s)H

NC

BW

J3C

hass

is G

ND

McD

onne

ll &

Mill

erS

erie

s 75

01

23

54

PC

hass

is G

ND

McD

onne

ll &

Mill

erR

B-1

22H

(Bla

ck W

ire)

N(W

hite

Wire

)C

(Yel

low

Wire

)B

(Yel

low

Wire

)—

——

McD

onne

ll &

Mill

erR

B-1

201

23

45

——

McD

onne

ll &

Mill

erR

B-2

4R

ed W

ireW

hite

Wire

Yello

w W

ireYe

llow

Wire

——

—

Hyd

role

vel

241

2P

1P

2A

——

Hyd

role

vel

170

HG

NP

1P

2A

——

Hyd

role

vel

1100

Red

Wire

Whi

te W

ireYe

llow

Wire

Yello

w W

ire—

——

Hyd

role

vel

1150

H(B

lack

Wire

)N

(Whi

te W

ire)

CU

T-O

FF(Y

ello

w W

ire)

CU

T-O

FF(Y

ello

w W

ire)

——

—

Hyd

role

vel

400,

500

, 60

0, 7

00,

450,

550,

650

, 75

01

2P

1P

2A

H3

Cha

ssis

GN

D

Hyd

role

vel

RW

700

Ser

ies

(Exc

ept

RW

700A

1098

)L1

L2—

BA

2 R

ed W

ires,

Whi

te W

ireG

reen

Wire

Hyd

role

vel

RW

700A

1098

T1T2

—B

A2

Red

Wire

s,W

hite

Wire

Gre

en W

ire

Taco

LTR

, LN,

LT-

1, LT

A-2

& LF

Ser

ies

Low

Wat

er C

utof

f and

Tac

o El

ectri

c W

ater

Fee

der W

iring

Cro

ss R

efer

ence

84

85

Aquastat Wiring

L1 L2 T T

L1(HOT)

L2(NEUTRAL)


OR GAS VALVE

CIRCULATORON BOILER

(IF ATTACHED)

B2 C2 B1ZR

TACOZONE

CONTROL

HONEYWELL L8124A & C OR EQUAL

120 VACINPUT

C1 ZC

END SWITCH

B1 B2 T T

L1(HOT)

L2(NEUTRAL)

CIRCULATORON BOILER

(IF ATTACHED)L1 C2L2

TACOZONE

CONTROL

HONEYWELL L8124B OR EQUAL120 VACINPUT

C

MILLI-VOLTAGEGAS VALVE

END SWITCH

TV T Z

L1(HOT)

L2(NEUTRAL)

CIRCULATORON BOILER

(IF ATTACHED)

L1

C2

L2

TACOZONE

CONTROL

HONEYWELL L8124E OR EQUAL

120 VACINPUT

C1

LOW VOLTAGEGAS VALVE

END SWITCH

B1 B2

Aquastat Wiring

TV T Z

L1(HOT)

CIRCULATORON BOILER

(IF ATTACHED)

B2C2

B1

C1

TACOZONE

CONTROL

HONEYWELL L8124G & L OR EQUAL120 VACINPUT

ZR

END SWITCH

L1

L2(NEUTRAL)

L2

ZC

LINEVOLTAGE

OIL BURNERRELAY OR

GAS VALVE

L1 L2 T T

L1(HOT)

L2(NEUTRAL)


OR GAS VALVE

CIRCULATORON BOILER

(IF ATTACHED)

B2

C1

B1ZR

TACOZONE

CONTROL

HONEYWELL L8124M OR EQUAL

120 VACINPUT

C2

ZC

END SWITCH

L1 L2 T T

L1(HOT)

L2(NEUTRAL)


OR GAS VALVE

CIRCULATORON BOILER

(IF ATTACHED)

C1 B2B1

TACOZONE

CONTROL

HONEYWELL L8148A OR EQUAL

120 VACINPUT

C2

END SWITCH

3

86

87

Aquastat Wiring

TV W T

L1(HOT)

L2(NEUTRAL)

CIRCULATORON BOILER

(IF ATTACHED)

L1

C2

L2

TACOZONE

CONTROL

HONEYWELL L8148E OR EQUAL

120 VACINPUT

C1


END SWITCH

B1 B2

Z

TV W T

L1(HOT)

L2(NEUTRAL)

CIRCULATORON BOILER

(IF ATTACHED)

L1

C2

L2

TACOZONE

CONTROL

HONEYWELL L8148J OR EQUAL

120 VACINPUT

C1


END SWITCH

B1 B3

ZTP

B2

MILLI-VOLTAGE

GASVALVE

OR

L1 L2B2C2

B1

L1(HOT)

L2(NEUTRAL)

OIL BURNERAND

IGNITION

CIRCULATORON BOILER

(IF ATTACHED)

T T FF

TACOZONE

CONTROL

HONEYWELL L8182D OR EQUAL

120 VACINPUT

ZC

ZR

END SWITCH

C1

CAD CELL

Aquastat Wiring

L1 L2 T T

L1(HOT)

L2(NEUTRAL)


OR GAS VALVE

CIRCULATORON BOILER

(IF ATTACHED)

B2 C2 B1ZR

TACOSWITCHING

RELAY

HONEYWELL L8124A & C OR EQUAL

120 VACINPUT

C1 ZC

ZC ZR N H

T

THERMOSTAT(IF INDEPENDENT ZONE)

X XEND SWITCH

TV T Z

L1(HOT)

CIRCULATORON BOILER

(IF ATTACHED)

B2C2

B1

C1

HONEYWELL L8124G & L OR EQUAL

120 VACINPUT

ZR

L1

L2(NEUTRAL)

L2

ZC

LINEVOLTAGE

OIL BURNERRELAY OR

GAS VALVE

T THERMOSTAT(IF INDEPENDENT ZONE)

TACOSWITCHING

RELAY

ZC ZR N H

X XEND SWITCH

L1 L2 T T

L1(HOT)

L2(NEUTRAL)


OR GAS VALVE

CIRCULATORON BOILER

(IF ATTACHED)

B2 C2 B1ZR

HONEYWELL L8124M OR EQUAL

120 VACINPUT

C1 ZC

T


TACOSWITCHING

RELAY

ZC ZR N H

X XEND SWITCH

88

89

Aquastat Wiring


OR GAS VALVE

CIRCULATORON BOILER

(IF ATTACHED)

C1

B2

B1

HONEYWELL L8148A OR EQUAL

C2

3

L1 L2 T T

L1(HOT)

L2(NEUTRAL)120 VAC

INPUT

T


R

W

BB

RL6006LOWLIMIT

CONTROLERB2

TACOSWITCHING

RELAY

ZC ZR N H

X XEND SWITCH

L1 L2B2C2

B1

L1(HOT)

L2(NEUTRAL)

OIL BURNERAND

IGNITION

CIRCULATORON BOILER

(IF ATTACHED)

T T FF

HONEYWELL L8182D OR EQUAL

120 VACINPUT

ZC

ZR

C1

CAD CELLTTHERMOSTAT

(IF INDEPENDENTZONE)

TACOSWITCHING

RELAY

ZC ZR N H

X XEND SWITCH

Wiring for Boilers with Honeywell Aquastat Model L8124E or Equivalent

TV T Z

L1(HOT)

L2(NEUTRAL)

CIRCULATORON BOILER

(IF ATTACHED)

L1

C2

L2

120 VACINPUT

C1

B1 B2

TACO LTR0243T-1

YELREDWH YELGRN

HONEYWELLL8124E

G

FACTORY WIRING(unplug from B1 terminal)

MALECONNECTOR

FEMALECONNECTOR

NOTE: The green wire must be connected to a ground source electrically common to the boiler ground.

Wiring for Boilers with Honeywell Aquastat Model L8148E or Equivalent

TV W T

L1(HOT)

L2(NEUTRAL)

CIRCULATORON BOILER

(IF ATTACHED)

L1

C2

L2

120 VACINPUT

C1B1 B2

Z

TACO LTR0243T-1

YELREDWH YELGRN

G

FACTORY WIRING(unplug from B1 terminal)

MALECONNECTOR

HONEYWELLL8148E

FEMALECONNECTOR

NOTE: The green wire must be connected to a ground source electrically common to the boiler ground.

90

91

Aquastat Wiring to 24VAC Low Water Cutoff

TV W T

L1(HOT)

L2(NEUTRAL)

CIRCULATORON BOILER

(IF ATTACHED)

L1

C2

L2

120 VACINPUT

C1


B1 B2

HONEYWELLL8148E

TACO LNA024 or LTA024-2

N H COM NC NO

SPILLSWITCH

B

R

Z

G

TOTHERMOSTAT

Aquastat Wiring to 120VAC Low Water Cutoff

TV W T

L1(HOT)

L2(NEUTRAL)

CIRCULATORON BOILER

(IF ATTACHED)

L1

C2

L2

120 VACINPUT

C1


B1 B2

HONEYWELLL8148E

TACO LNA120 OR LTA120-2

N H COM NC NO

SPILLSWITCH

B

R

Z

G

TOTHERMOSTAT

Instruction SheetSR501-4 Switching Relay

92

AlternativeWiring

TACO SR501-4 REPLACEMNENT CROSS-REFERENCE

MANUFACTURER MODEL CONNECTIONS

Taco SR501-4 H N 3 4 NO 4 NC 5 6 NO 6 NC R/T W/T C

Argo AR821 1 2 3 4 5 6 T

AR822 L1 L2 3 4 NO 4 NC 5 6 NO 6 NC R/T G/T C

Colombus MR10 L1 L2 3 4 NO 4 NC 5 6 NO 6 NC R/T G/T C

Erie SR100 L1 N 3 4 NO 4 NC 5 6 NO 6 NC R/T G/T C

Honeywell RA89A 1 2 3 4 T T

RA832A 1 2 3 4 X X T T

R845A 1 2 3 4 5 6 T T

White-Rogers 889-189 1 2 3 4 T T

829-845 1 2 3 4 5 6 T T

Features:

External Indicator LightsUniversal ReplaceabilitySnap-in PC BoardSimplified WiringSealed RelaysFuse Protected Outputs100% Factory TestedContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL ApprovedExtended 3 Year WarrantyMade in the USA

Operation:

Connect a thermostat to the “T T” terminalson the switching relay. When the thermo-stat calls for heat, the relay is energized andpower is given to the circulator.

Power Input:

Connect 120 volt ac power to terminals Nand H.

Jumper Placement:

The jumper is factory installed between terminals Hand 3 to switch power on terminals 4 n/o and 4 n/c.

External Diagnostics:

The External lights show full functionality of theswitching relay. The green light should always be on,indicating that power is connected. When the ther-mostat calls for heat, both the appropriate circulatorand red indicating light is energized.

The Taco Connection:Combine the reliability of the Taco Zone Valves,Priority Zoning Circulators, Thermostats, and the“00” family of circulators with the advanced featuresof the Taco Zone Controls to achieve total systemintegration. No matter the application, Taco now pro-vides the products to maximize system performancewhile simplifying both installation and service.

SR 501-4


120 VACINPUT

T T COM

R W 24VAC

TO: 120 VAC POWER CIRCULATOR

TO: ZC

THERMOSTAT

TO: ZR


FUSE6 AMP

POWER

ZONE 1

LEDINDICATORS

FUSE6 AMP


SR 501-4

FUSE6 AMP

POWER

ZONE 1

LEDINDICATORS

FUSE6 AMP


120 VACINPUT

T T COM

R W 24VAC

TO: 120 VAC POWERCIRCULATOR

JUMPERTO: TT ON BOILER

THERMOSTAT

Terminal Description:T & T Thermostat ConnectionCOM Common side of transformer, to power some

setback thermostatsN Neutral wire of power inputH Hot wire of power input3 Common terminal for 4 n/o and 4 n/c4 n/o Normally open terminal4 n/c Normally closed terminal6 n/c Normally closed terminal6 n/o Normally open terminal5 Common terminal for 6 n/o and 6 n/c

NOTE: When using Alternative Wiring diagram, the boiler operatingcontrol’s ZC terminal will see the load of the circulator(s). WARNING: When using Alternative Wiring diagram, wiring instruc-tions must be followed so power originates from the boiler aquastat.Failure to follow these wiring instructions may result in a secondarysource of power being connected to the boiler that may activate itunder certain circumstances, causing injury or death.

Specifications:PRODUCT NUMBER INPUT MAXIMUM TYPE 1 ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH

SR501-4 1 120/60/1 VAC 12 amps 47/8" 65/8" 23/8"

All circulator relay connections, including ZC/ZR, are rated 1/3 hp (6 FLA, 36 LRA) at 120 VAC.The thermostat connection supplies a 24 VAC class 2 output.

WARNING: Wiring connections must be made in accordance with allapplicable electrical codes. Use copper wire only. 120 VAC wiring musthave a minimum temperature rating of 75°C. Failure to follow thisinstruction can result in personal injury or death and/or propertydamage. 12-18 gauge wire recommended for 120 VAC connections,14-22 gauge wire for thermostat connections, and 14-22 gauge wire for24 VAC source connections.

TypicalWiring

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any inter-ference received, including interference that may cause undesired operation.

Do it Once. Do it Right.®

TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.Visit our web site at: http://www.taco-hvac.com

Printed in USA

Copyright 2010

TACO, Inc.

93

Instruction SheetSR501-HC-4 Switching Relay, High Current

Features:External Indicator LightsSimplified WiringSealed Relays100% Factory TestedContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL ApprovedExtended 3 Year WarrantyMade in the USA

120 VAC Application:1 zone switching relay with boiler enable or2 zone without boiler enable.

240 VAC Application:1 zone switching relay when switching bothof the circulator hot leads (L1 & L2).

Operation:Connect a thermostat to the R & W1 and/or W2 terminals onthe switching relay. When the thermostat(s) call for heat, therelays are energized and power is given to the circulator(s).

Zone Control Power Input:Connect 120 volt AC power input to terminals N and H.Neutral wire to terminal N. Hot wire to terminal H.

External Diagnostics:The external lights show full functionality of the switchingrelay. The green light should always be on, indicating thatpower is connected. When either thermostat calls for heat,both the appropriate relay and red indicating light areenergized.

The Taco Connection:Combine the reliability of the Taco Zone Valves, PriorityZoning Circulators, Thermostats, and the “00” family of cir-culators with the advanced features of the Taco Zone Controlsto achieve total system integration. No matter the applica-tion, Taco now provides the products to maximize systemperformance while simplifying both installation and service.Terminal Description:R Hot side of transformer. Connect to R on thermostat.W1 Switched R signal from thermostat #1. Connect to W on thermostat.W2 Switched R signal from thermostat #2. Connect to W on thermostat.C Common side of transformer. Connect to COM

on thermostat (optional).N Neutral wire of power input.H Hot wire of power input.X1 Dry contacts for relay 1 (W1).X1 Dry contacts for relay 1 (W1).X2 Dry contacts for relay 2 (W2).X2 Dry contacts for relay 2 (W2).

AlternativeWiring


SR 501-HC-4

LEDINDICATORS

R W1

24 VAC THERMOSTAT

W2COM

24VAC

T T T


120 VACINPUT

120 VACCIRCULATOR

X1X2 X2

N

ZR

ZC

HPOWER INPUT

(120 VAC)

POWER

RELAY 1

RELAY 2


SR 501-HC-4

LEDINDICATORS

R W1

24 VAC THERMOSTAT

W2COM

24VAC

T T T


120 VACINPUT

POWERINPUT

(120 VAC)120 VAC

CIRCULATOR

X1X2 X2

N

H

BOILERCONTROL

POWER

RELAY 1

RELAY 2

NOTE: When using Alternative Wiring diagram, the boiler operatingcontrol’s ZC terminal will see the load of the circulator(s). WARNING: When using Alternative Wiring diagram, wiring instruc-tions must be followed so power originates from the boiler aquastat.Failure to follow these wiring instructions may result in a secondarysource of power being connected to the boiler that may activate itunder certain circumstances, causing injury or death.Specifications:

PRODUCT NUMBER INPUT TYPE 1 ENCLOSURENUMBER OF ZONES VOLTAGE WIDTH HEIGHT DEPTH

SR501-HC-4 1 or 2 120/60/1 VAC, 0.84 MA 47/8" 65/8" 23/8"

RELAY RATING: 1/3 HP (13.8 FLA, 82.8 LRA at 120 VAC) (6.9 FLA, 41.4 LRA at 240 VAC)The thermostat connection supplies a 24 VAC class 2 output.

WARNING: Wiring connections must be made in accordance with allapplicable electrical codes. Use copper wire only. Failure to follow thisinstruction can result in personal injury or death and/or propertydamage. 12-18 gauge wire recommended for 120/240 VAC connec-tions, 14-22 gauge wire for thermostat connections, and 14-22 gaugewire for 24 VAC source connections.

TypicalWiring

94



Printed in USA

Copyright 2010

TACO, Inc.

SR501-HC-4 Switching Relay Instruction Sheet (page 2)


SR 501-HC-4

LEDINDICATORS

R W1

24 VAC THERMOSTAT

W2COM

24VAC

T T T


120 VACINPUT

240 VACCIRCULATOR

X1X2 X2

N

H1

H2

ONE ZONE, NO BOILER ENABLE(CONTROL & CIRCULATOR SAME POWER SOURCE)


POWER

RELAY 1

RELAY 2

(240 VAC)

{{


SR 501-HC-4

LEDINDICATORS

R W1

24 VAC THERMOSTAT

W2COM

24VAC

T T T


120 VACINPUT

240 VACCIRCULATOR

X1X2 X2

N

H1

H2

ONE ZONE, NO BOILER ENABLE(CONTROL & CIRCULATOR DIFFERENT POWER SOURCE)

H

POWER

RELAY 1

RELAY 2


(240 VAC)

{

{


SR 501-HC-4

LEDINDICATORS

R W1 W2COM

24VAC

T T T


120 VACINPUT


X1X2 X2

N

TWO ZONE, NO BOILER ENABLE

H




POWERINPUT

(120 VAC)

POWER

RELAY 1

RELAY 2

95

Instruction SheetSR501-OR-4 Switching Relay with Outdoor Reset

ONE ZONE INSTALLATION W/O INDIRECT DHW


WITH OUTDOOR RESET

SR 5

01O

R-4

LEDINDICATORS

POWER

TSTAT

DHWOVERRIDE

BOILERRELAY

N H

INPUT120 VAC

ZONE 1120 VAC

N H

6AMP

X RBOILER TSTAT

W C R WDHW

OUTDOORSENSOR

SUPPLYSENSOR

XDESIGN OUTDOOR


TEMPERATURE

OFF

-30

-20

0-10 10

20

40

30

ON

SW1

OFF


N

H

POWERINPUT

(120 VAC)

24 VACTHERMOSTAT

BOILERCONTROL

OUTDOORSENSOR

BOILERSUPPLYSENSOR

POT1

MULTI-ZONE INSTALLATION WITH ZONE CONTROL, WITH INDIRECT DHW


WITH OUTDOOR RESET

SR 5

01O

R-4

LEDINDICATORS

POWER

TSTAT

DHWOVERRIDE

BOILERRELAY

N H

INPUT120 VAC

ZONE 1120 VAC

N H

6AMP

X RBOILER TSTAT

W C R WDHW

OUTDOORSENSOR

SUPPLYSENSOR

XDESIGN OUTDOOR


TEMPERATURE

OFF

-30

-20

0-10 10

20

40

30

ON

SW1

OFF


N

H

POWERINPUT

(120 VAC)

BOILERCONTROL

OUTDOORSENSOR

BOILERSUPPLYSENSOR

POT1

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3


POW

ER IN

24 V

AC

N/O COM N/C

PUMP ENDSWITCH

FUSE

5 A

MP


THERMOSTATS(24VAC)

T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

POWER

LEDINDICATORS




X X

ZONE 3PRIORITY

OFF

ONC C C



123

JUMPER3 & 4


123

DHWAQUASTATA

CONTROL STRATEGY:

Outdoor Reset:

In order to properly control a hot water heating system, the heat sup-plied to the building must equal the heat lost by the building.

• The heat supplied to a building is proportional to the temperature ofthe supply water and the surface area of the heating element. Asmall surface area such as baseboard radiators requires a higherwater temperature than a larger surface area such as radiant floors.

• The heat lost from a building is dependent on the outdoor tem-perature, as well as other factors. As the outdoor temperaturedrops, the building heat loss increases.

Reset Ratio:

Operation of a hot water heating system can generally be improved bymodulating the supply water temperature as the outdoor temperaturechanges. Using this approach, the heat lost from the building ismatched by the heat input to the building. The SR501-OR boiler resetcontrol utilizes a reset ratio to set the relationship between outdoortemperature and supply water temperature. The reset ratio determinesthe amount the supply water temperature is raised for every 1° drop inoutdoor air temperature, and it is determined from the starting pointand the system design conditions. In order for the control to automat-ically determine the reset ratio, outdoor design conditions must beestablished. This is usually the typical coldest outdoor temperatureor it can be set by using ASHARE standards for Design OutdoorTemperature for specific geographic locations.

APPLICATION:

The SR501-OR is a microprocessor-based control designed to regulatethe supply water temperature of a single boiler, based on the outdoortemperature. The SR501-OR is a boiler reset control and switching relayin one unit. The SR501-OR is ideal for retrofit application, but may alsobe used in new installations as well.

The SR501-OR includes functions such as automatic reset ratio calcu-lation, warm weather shut down (WWSD), minimum boiler temperaturesetting, and boiler differential setting. The control also has boiler sensorand outdoor sensor error checking.

40 30 20 100

-10

-20

-30

70-20

90

130

110

150

170

180

190

210

90 80 70 60 50 40 30 20 10 0 -10

OUTDOOR TEMPERATURE (°F)

BOILER SUPPLY TEMPERATURE vs. OUTDOOR TEMPERATURE (°F)FOR OUTDOOR DESIGN TEMPERATURES

BO

ILE

R S

UP

PLY

TE

MP

ER

ATU

RE

(°F)

96

SR501-OR-4 Switching Relay Instruction Sheet (page 2)Boiler Operation:

The supply water temperature from a boiler can be controlled bycycling the boiler on and off. Modulation of the boiler’s operatingtemperature in hot water heating systems not only provides morecomfort but also offers significant energy savings. The cooler theboiler runs, the more efficient it is due to less heat losses up the flueand reduced boiler jacket losses.

Differential:

An on / off boiler must be operated with a differential in order to pre-vent short cycling. When the supply water temperature drops belowthe bottom rail of the differential, the boiler is turned on. The boiler isthen kept on until the supply water temperature rises above the toprail of the differential. If the differential is too wide, there can be largesupply water temperature swings; however, if the differential is toonarrow, the boiler short cycles and operates inefficiently. This controlcan be set for two different boiler differentials, 10°F (6°C) or 20°F(12°C). This setting will help to achieve an appropriate balancebetween temperature swings and boiler efficiency.

Minimum Boiler Supply:

Most boilers require a minimum supply water temperature in order toprevent corrosion from flue gas condensation. The control shouldtherefore only modulate the boiler supply water temperature down tothe boiler manufacturer’s minimum recommended operating temper-ature. Some boilers are designed to condense and should be oper-ated at low water temperatures as much as possible for maximumefficiency.

Sup

ply

Wat

er T

em

per

atur

e

Time

Differential = 10°F (5°C)

165°F(74°C) Boiler off

Boi

ler o

n

155°F (68°C)

160°F (71°C)

Boiler off

Boi

ler o

n

Outdoor Air Temperature

50(10)

30(-1)

10(-12)

-10(-23)

70(21)

90(32)

WWSDTemperature

°F (°C)

Sup

ply

Wat

er T

empe

ratu

re

110 (43)

70 (21)

90 (32)

210 (99)

170 (77)

150 (65)

130 (54)

190 (88)

ResetRatio

BoilerMinimum

SEQUENCE OF OPERATION:

Powering Up the Control:

After the SR501-OR is powered up, the green power LED light will be on.

Heating Demand:

The SR501-OR receives a heating demand from thermostat or zonecontrol end switch closure on the R and W thermostat terminals. Thethermostat red LED light will also be turned on. The control can besetup for boiler temperature reset or ON – OFF boiler operation.

Reset Demand:

When the SR501-OR receives a heating demand the controls enablethe boiler based on the reset cure. The Boiler Relay red LED light willbe turned on when the boiler relay is energized.

DHW Demand:

When the SR501-OR receives a DHW demand the controls enablethe boiler and ignore the boiler reset curve. The DHW Override redLED light will also be turned on.

Warm Weather Shut Down (WWSD):

When the outdoor temperature rises above 70°F (21°C), the controlturns off the boiler. This function only applies for space heating andnot DHW operation.

Boiler Operation:

When the SR501-OR has a reset demand, the system supply watertemperature is controlled by turning the boiler on and off. The controlcalculates the target supply water temperature based on the outdoortemperature, and the settings that were entered. The boiler operatesaround a differential that is manually set by dip switch number 2. Thecontrol includes a minimum on and off time for the boiler, in order tominimize short cycling.

Maximum Boiler Supply:

The SR501-OR does not allow the boiler target temperature toexceed the boiler design temperature setting plus 10°F (6°C) up to amaximum of 225°F (107°C).

Minimum Boiler Supply:

The SR501-OR has a 140°F minimum boiler setting which is used inorder to prevent corrosion from flue gas condensation. During mildoutdoor conditions, the boiler cycles around the minimum boiler set-ting. This programmed function can be set to the OFF setting forcondensing and electric boilers.

INSTALLATION:

Step One:

Check the contents of this package. If any of the contents listed aremissing or damaged, please contact your sales representative forassistance.

The SR501-OR includes:

SR501-OR Boiler Reset Control and Switching Relay CombinationOne Outdoor SensorOne Strap on SensorInstruction Sheet

Replacement sensors are available from Taco, Inc.:

Strap on Sensor – 9300-2044RPOutdoor Sensor – 9300-2052RP

Note: Carefully read the details of the Sequence of Operation sectionin this brochure to ensure that you have chosen the proper control foryour application.

CAUTION: Improper installation and operation of this controlcould result in damage to the equipment and possibly evenpersonal injury. It is your responsibility to ensure that this con-trol is safely installed according to all applicable codes andstandards. This electronic control is not intended for use as aprimary limit control. Other controls that are intended and cer-tified as safety limits must be part of the control circuit.

97

SR501-OR-4 Switching Relay Instruction Sheet (page 3)

Step Two:

Installing the Control:

The enclosure is to be mounted flush onto a wall or any ridge surface.

• The mounting holes in the enclosure accept #6 screws. • Line voltage to enter from bottom of control and low voltage to

enter from top of control.

Installing the Outdoor Sensor:

Note: The temperature sensor (thermistor) is built into the enclosure.

• Use one round or pan head screw to attach the base of the sen-sor to the wall.

• The sensor is wall mounted and the wiring enters through thebottom of the enclosure. The hole for the cable entry must facedownward in order to prevent water from entering and filling theenclosure.

• The sensor should be mounted on a wall which best representsthe heat load on the building (i.e. a northern wall for most build-ings and a southern facing wall for buildings with large southfacing glass areas). The sensor should not be installed near heatsources such as ventilation or window openings.

• The sensor should be installed at an elevation above the groundthat will prevent accidental damage or tampering.

• Install the Outdoor Sensor and run the wiring back to the controlmounting location.

Installing the Boiler Sensor:

Note: This sensor is designed to mount on a pipe or in a temperatureimmersion well.

• The sensor can be strapped directly to the pipe using the cabletie provided. Insulation should be placed around the sensor toreduce the effect of air currents on the sensor measurement.

• The Boiler Sensor should be placed downstream of a pump orafter an elbow or similar fitting. This is especially important iflarge diameter pipes are used because the thermal stratificationwithin the pipe can result in erroneous sensor readings. Propersensor location requires that the fluid is thoroughly mixed withinthe pipe before it reaches the sensor.

Step Three:

Wiring to the Zone Control:

Line Voltage Connections –

Connect 120VAC incoming line voltage; Hot to the H terminal andNeutral to the N terminal.

Connect 120VAC circulator; HOT lead of circulator to Zone H ter-minal and Neutral lead of circulator to Zone N terminal.

Low Voltage Connections –

Connect thermostat or zone control end switch to the R and Wthermostat terminals.

Connect the DHW aquastat to the R and W DHW override terminals(optional).

Connect boiler’s T and T terminal to the X and X boiler end switchterminals.

Wiring the Sensors:

Do not apply power to these terminals as this will damage thecontrol.

Outdoor Sensor

Connect the two wires from the Outdoor Sensor to the OutdoorSensor terminals. The Outdoor Sensor measures the outdoor airtemperature.

Boiler Sensor

Connect the two wires from the Boiler Sensor to the SupplySensor terminals. The Boiler Sensor measures the supply watertemperature going from the boiler to the system.

SETTINGS:

Before adjusting the settings, read through the sequence of operationto ensure that you understand how the control operates. The follow-ing page describes how to program these settings into the controlonce it has been powered up.

Step Four:

Outdoor Design Temperature:

The Outdoor Design setting is the outdoor temperature used in the heatloss calculation. It is set to the typical coldest outdoor temperature.Using a small screwdriver adjust the rest ratio knob to appropriateOutdoor Design Temperature. When set to OFF, the boiler temperaturewill not be reset and boiler will fire to high limit when there is a call forheat.

Boiler Minimum Supply Temperature (Dip Switch #1):

Most boilers require a minimum operating temperature to preventcorrosion from flue gas condensation. The minimum boiler dip switchshould be set to ON (140°F) supply water temperature so boiler canoperate without causing the boiler flue gases to condense. Consultthe boiler manufacturer for recommended minimum boiler supplytemperatures. The dip switch can also be set to OFF (70°F) whencondensation is not a concern.

Differential (Dip Switch #2):

The differential adjustment sets how far the actual boiler supply watertemperature may deviate from the desired temperature before theboiler is turned on or off. This is a function of the water content of theboiler and the flow rate through the system pump relative to the heatoutput of the boiler. The differential can be set by dip switch #2, setto OFF for 10°F (6°C) or set to ON for 20°F (12°C).

Pump Operation (Dip Switch #3):

The pump operation is controlled by dip switch #3. When the dipswitch is set to ON, the pump output will energize when thermostator DHW calls for heat. When set to OFF, the pump will only come onwhen the thermostat calls for heat not the DHW.

Warm Weather Shut Down:

When the outdoor temperature rises above the 70°F (21°C), the con-trol turns off the boiler. This function only applies for space heatingand not DHW operation.



Printed in USA

Copyright 2010

TACO, Inc.

98

SR501-OR-4 Switching Relay Instruction Sheet (page 4)

TROUBLESHOOTING:

Step Five:

As in any troubleshooting procedure, it is important to isolate a prob-lem as much as possible before proceeding. The blinking error LEDlight greatly simplifies troubleshooting of the SR501-OR. If you sus-pect a wiring fault, return to step three and carefully check all externalwiring and wiring connections.

Sensor Errors:

• If an outdoor sensor fault occurs, the SR501-OR will assume afixed outdoor temperature of 32°F (0°C) and will target theappropriate supply water temperature. The Boiler light will blinktwice every 5 seconds to indicate the outdoor sensor error.

• If a boiler sensor fault occurs, the SR501-OR turns the boiler offand the Boiler light will blink once every 5 seconds to indicatethe boiler supply sensor error.

Adjustment of Settings:

• If the outdoor temperature is cold and the rooms are cold,increase the Outdoor Design setting by 5°F (3°C) per day.

• If the boiler is cycling too often, increase the Differential setting.

Testing the Sensors:

A good quality test meter capable of measuring up to 5,000 kΩ(1 k = 1000 Ω) is required to measure the sensor resistance. In additionto this, the actual temperature must be measured with either a goodquality digital thermometer, or, if a thermometer is not available, a sec-ond sensor can be placed alongside the one to be tested and the read-ings compared. First measure the temperature using the thermometerand then measure the resistance of the sensor at the control. The wiresfrom the sensor must not be connected to the control while the test isperformed. Using the chart below, estimate the temperature measuredby the sensor. The sensor and thermometer readings should be close.If the test meter reads a very high resistance, there may be a brokenwire, a poor wiring connection or a defective sensor. If the resistance isvery low, the wiring may be shorted, there may be moisture in the sen-sor or the sensor may be defective. To test for a defective sensor, mea-sure the resistance directly at the sensor location.

Ω

ΩDo not apply voltage to a sensor at any timeas damage to the sensor may result.

Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance

°F °C Ω °F °C Ω °F °C Ω °F °C Ω

-30

-20

-10

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

180

190

200

-34

-29

-23

-18

-12

-7

-1

4

10

16

21

27

32

38

43

49

54

60

66

71

77

82

88

93

234,196

165,180

118,018

85,362

62,465

46,218

34,558

26,099

19,900

15,311

11,883

9,299

7,334

5,828

4,665

3,760

3,050

2,490

2,045

1,689

1,403

1,172

983

829

TECHNICAL DATA:

The installer must ensure that this control and its wiring are isolatedand/or shielded from strong sources of electromagnetic noise. Thisdevice complies with part 15 of the FCC Rules. Operation is subject to thefollowing two conditions: (1) This device may not cause harmful interfer-ence, and (2) this device must accept any interference received, includinginterference that may cause undesired operation.

SR501-OR Boiler Reset Control Relay:

Control: Microprocessor PI control. This is not asafety (limit) control.

Dimensions: 41⁄4" W x 51⁄4" H x 23⁄4" DApprovals: UL listed for US and Canada, Temperature

Indicating and Regulating Equipment.Power Supply: 120/60/1 VAC, 12 amps maximumRelays: Boiler Relay 1 amp @ 24 VAC

Circulator Relay 1⁄3 HP (6 FLA, 36 LRA

Sensors: NTC thermistor, 10 kΩ @ 77°F(25°C ±0.2°C) ß=3892

Outdoor Design Temp.: -30°F to 40°F (-35°C to 5°C) Boiler Minimum: 70°F or 140°F (21°C or 60°C) Differential: 10°F or 20°F (6°C or 12°C)WWSD: 70°F (21°C)

99

Instruction SheetSR502/503/504/506-4 Switching Relay

120 VAC INPUT



INPUT120 VAC

ZONE 1 ZONE 2



THERMOSTATS

SR 506-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP



PRIORITY120 VACZR


ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

ZONE 5

ZONE 6

LEDINDICATORS

ZONE 6PRIORITY

OFF

ON

PRIORITY

TO: "TT" ON BOILER

JUMPER

24 VAC

COM

120 VAC INPUT



INPUT120 VAC

ZONE 1 ZONE 2



THERMOSTATS

SR 506-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP



PRIORITY120 VACZR


ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

ZONE 5

ZONE 6

LEDINDICATORS

ZONE 6PRIORITY

OFF

ON

PRIORITY

TO: "ZC"ON BOILER

TO: "ZR"ON BOILER

24 VAC

COM

Operation: When any thermostat calls for heat, the appropriate circu-lator is energized and the isolated end switch (X and X) will start theboiler.Priority Operation: When zone 6 is switched to the priority settingand is actuated, all other zones will stop operation until zone 6 is sat-isfied. When zone 6 is not switched to priority, all zones will operateindependently.Priority Protection Operation: When the priority switch is set to ON,and if the priority zone calls continuously for more than one hour,power is returned to all the other zones, allowing each zone to functionindependently. Once the priority zone is satisfied, the control’s auto-reset is activated and the priority zone is again allowed to have priorityfor up to one hour starting from when it calls next.Jumper Placement: The jumper should be placed between terminalsZC and ZR. Connect the isolated end switch to the aquastat control onthe boiler.

Power Input: Connect 120 volt ac power input to terminals N and H.Neutral wire to terminal N. Hot wire to terminal H.

Operation: When any thermostat calls for heat, the boiler is given asignal to start. The appropriate circulator is energized only when theboiler temperature is above the set low limit.Priority Operation: When zone 6 is switched to the priority settingand is actuated, all other zones will stop operation until zone 6 is sat-isfied. When zone 6 is not switched to priority, all zones will operateindependently.Priority Protection Operation: When the priority switch is set to ON,and if the priority zone calls continuously for more than one hour,power is returned to all the other zones, allowing each zone to functionindependently. Once the priority zone is satisfied, the control’s auto-reset is activated and the priority zone is again allowed to have priorityfor up to one hour starting from when it calls next.Jumper Placement: REMOVE the jumper between terminals ZC andZR. Connect terminal ZC to ZC on the aquastat control. Connect ter-minal ZR to ZR on the aquastat control. Confirm polarity is consistentbetween boiler aquastat and switching relay.Power Input: Connect 120 volt ac power input to terminals N and H.Neutral wire to terminal N. Hot wire to terminal H.

The Taco Connection:Combine the reliability of the Taco Zone Valves, Priority ZoningCirculators, Thermostats, and the “00” family of circulators with theadvanced features of the Taco Zone Controls to achieve total systemintegration. No matter the application, Taco now provides the productsto maximize system performance while simplifying both installationand service.External Diagnostics:Externally visible lights show full functionality of the switching relay.The green light should always be on, indicating that power is connected.When the thermostat calls for heat, both the appropriate circulator andred indicating light is energized.

Cold Start BoilerApplication

Tankless Coil BoilerApplication(Alternative Wiring)

Features:External Indicator LightsSwitchable PriorityPriority ProtectionSimplified WiringSealed RelaysFuse Protected OutputsCompact Design100% Factory TestedIsolated End Switch

Contractor Friendly PC Board Layout

Universal Thermostat Compatibility

UL Approved24 volt Power Input or Output

TerminalExtended 3 Year WarrantyMade in the USA

WARNING: When using Alternative Wiring diagram, wiring instructions must be followed so power originates from the boiler aquastat. Failureto follow these wiring instructions may result in a secondary source of power being connected to the boiler that may activate it under certaincircumstances, causing injury or death.


SR506-4 6 with Priority 120/60/1 VAC 20 amps 121/4" 8" 3"

All circulator relay connections, including ZC/ZR, are rated 1/3 hp (6 FLA, 36 LRA) at 120 VAC.End switch connections are rated 24 VAC, 1 amp.All thermostat connections supply a 24 VAC class 2 output.

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This devicemay not cause harmful interference, and (2) this device must accept any interference received, including interferencethat may cause undesired operation.

WARNING: Wiring connections must be made in accordance with allapplicable electrical codes. Use copper wire only. 120 VAC wiring must havea minimum temperature rating of 75°C. Failure to follow this instructioncan result in personal injury or death and/or property damage. 12-18 gaugewire recommended for 120 VAC connections, 14-22 gauge wire for thermo-stat connections, and 14-22 gauge wire for 24 VAC source connections.



Printed in USA

Copyright 2010

TACO, Inc.

100

Instruction SheetSR501-EXP-4 Switching Relay

POWER

ZONE 1

LEDINDICATORS

FUSE6 AMP

FUSE6 AMP

SR 501-EXP-4

POWERCONTROLS

SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL

4 MIN/24 HOUR

ACCESSORYPORT

120 VACINPUT

CIRCULATOR

HN/O N H120 VAC


N/CINPUT

120 VAC

PRIMARYCIRCULATOR(OPTIONAL)

TO: "TT" on Boiler Aquastat

THERMOSTAT

ENDSWITCH


X WRX 1A 2CB

TO: DHW Aquastat if PC700 Boiler Reset is installed. (See Page 2.)

T

24 VOLTS AC ONLY

C


Operation: When the thermostat calls for heat, the circulating pumpis energized and the isolated end switch (X and X) will start the boiler.Priority Operation: When the priority dip switch is set to ON and thezone is actuated, all other connected zoning panels will stop operationuntil the zone is satisfied. When the priority dip switch is set to OFFand the zone is actuated, all other connected zoning panels will oper-ate independently.Mode Operation: When the mode dip switch is set to NORMAL, the endswitch relay will be energized if any zone is in operation. When the modedip switch is set to RESET, the end switch relay will only be energizedthrough the operation of a plug-in reset control or closure of Priority Input.Primary Pump Operation: When the dip switch is set to OFF, the pri-mary circulating pump output will not energize when zone calls forheat. When the dip switch is set to ON, the primary circulating pumpoutput will energize when zone calls for heat.Post Purge Operation: When the dip switch is set to ON, the circula-tion pump output will stay energized for 2 minutes after its thermostator aquastat is satisfied, but not operate the boiler.Priority Protection Operation: When the dip switch is set to ON andthe zone (priority) on master zone panel calls for heat continuously formore than one hour, then power is returned to the space heating zonesallowing all the zones to function independently. Once the zone (pri-ority) on master zone panel is satisfied, the control’s auto-reset is acti-vated and the zone is again allowed to have priority for up to one hour. Pump Exercise Operation: When the dip switch is set to ON, the solidstate timer cycles all the circulating pumps that are attached to theExpandable Switching Relay at the selected time interval. The timeinterval can be set for the pumps to run for either 30 seconds every 2weeks or for 4 minutes every 24 hours.End Switch: The switch closes when the thermostat calls for heat andthe mode switch is set to NORMAL. The end switch also closes whenthe mode switch is set to RESET and a PC Series boiler reset power con-trol is calling for heat.Expansion Connections: Set the expansion switch to MASTER on theswitching relay that has the designated priority zone or is utilizing thePC Series plug-in option. Set all other daisy chained controls to SLAVE.Using thermostat wire (18-22 gauge) connect between terminals A, B,C on the master control to the corresponding A, B, C on the SLAVEcontrol(s). Controls may be daisy chained up to 20 zoning panels usingany combination of -EXP controls (120 zones if all are 6 zone panels).Thermostat Input (24 vac):

R Hot side of transformer. Connect to R on thermostat.W Switched R signal from thermostat. Connect to W on thermostat.C Common side of transformer. Connect to COM on

thermostat (optional).120 VAC Connections (N is Neutral, H is Hot):

Power Input Connect 120 Volt AC power.Primary Primary Pump (optional)N/O Zone Circulator ZoneN/C Zone Normally closed terminal for the Circulator Zone.

Will deactivate on a thermostat call.N Connect to pump neutral leads.

External Diagnostics: Externally visible lights show full functionality of theswitching relay. The green light should always be on, indicating that power isconnected. When the thermostat calls for heat, both the appropriate circulatorand red indicating light are energized.

WARNING: Wiring connections must be made in accordance with all applicable electrical codes. Use copper wire only. 120 VAC wiring must havea minimum temperature rating of 75°C. Failure to follow this instruction can result in personal injury or death and/or property damage. 12-18 gaugewire recommended for 120 VAC connections, 14-22 gauge wire for thermostat connections, and 14-22 gauge wire for 24 VAC source connections.

Wiring Diagram:

Features:Front External Indicator LightsIdeal for RetrofittingPrimary Circulator OutputSimplified WiringAdd-On Power ControlsSealed RelaysCompact DesignFuse Protected100% Factory TestedIsolated End SwitchUL Approved

Expandable to 20 Zoning Panels(120 zones if all are 6 zonepanels)

Contractor Friendly PC Board Layout

Universal ThermostatCompatibility

24 volt Power Input or OutputTerminal

Extended 3 Year WarrantyMade in the USA

SW1

SLAVEZONE PRIORITY ON

RESETPRIMARY PUMP FUNCTION ON

POST PURGE ONPRIORITY PROTECTION ON

PUMP EXERCISE ON30 SEC/2 WK

MASTEROFFNORMALOFFOFFOFFOFF4 MIN/24 HOUR

Dip Switch Settings:


SR501-EXP-4 1 120/60/1 VAC 12 amps 47/8" 65/8" 23/8"

All circulator relay connections, including ZC/ZR, are rated 1/3 hp (6 FLA, 36 LRA) at 120 VAC.The end switch connection is rated 24 VAC, 1 amp.The thermostat connection supplies a 24 VAC class 2 output.

This device complies with part 15 of the FCC Rules. Operation is subject to the fol-lowing two conditions: (1) This device may not cause harmful interference, and (2)this device must accept any interference received, including interference that maycause undesired operation.

For more wiring diagrams, visit www.taco-hvac.com.



Printed in USA

Copyright 2010

TACO, Inc.

101

Instruction SheetSR503-EXP, SR504-EXP & SR506-EXP Switching Relay



Printed in USA

Copyright 2010

TACO, Inc.

120 VAC INPUT

TO: "TT" ON BOILER

PRIMARY CIRCULATOR(OPTIONAL)



POWERCONTROLS


INPUT120 VAC

ZONE 1 ZONE 2

ZONE 3



THERMOSTATS

SR 506-EXP-4

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP

FUSE6 AMP




PRIORITY N/CPRIMARY

120 VACZR


SLAVE

PRIORITY ON

RESET

PRIMARY PUMP ON

POST PURGE ON

PRIORITY PROTECT ON

PUMP EXERCISE ON

30 SEC/2 WK

MASTER

OFF

OFF

OFF

OFF

OFF

NORMAL


4 MIN/24 HOUR

ZONE6 ZONE6

PRIORITY

ACCESSORYPORT

ZONE 2

POWER

ZONE 1

ZONE 3

ZONE 4

ZONE 5

ZONE 6

LEDINDICATORS

Operation: When any thermostat calls for heat, the appropriate circu-lating pump is energized and the isolated end switch (X and X) willstart the boiler.

Priority Operation: When the priority dip switch is set to ON and thepriority zone is actuated, all other zones will stop operation until pri-ority zone is satisfied. When not switched to priority, all zones willoperate independently.

Mode Operation: When the dip switch is set to NORMAL, the end switchrelay will be energized if any zone is in operation. When the switch is setto RESET, the end switch relay will only be energized if the priority zoneis in operation, or through the operation of a plug-in reset control.

Primary Pump Operation: When the dip switch is set to OFF, the pri-mary circulating pump output will energize when any zone calls for heat,except the priority zone. When the dip switch is set to ON, the prima-ry circulating pump output will energize when any zone calls for heat.

Post Purge Operation: When the dip switch is set to ON, the priorityzone output will stay energized for 2 minutes after its thermostat oraquastat is satisfied, but not operate the boiler.

Priority Protection Operation: When the dip switch is set to ON, andif the priority zone calls continuously for more than one hour, power isreturned to all the other zones, allowing each zone to function inde-pendently. Once the priority zone is satisfied, the control's auto-reset isactivated and the priority zone is again allowed to have priority for upto one hour starting from when it calls next.

Pump Exercise Operation: When the dip switch is set to ON, the solidstate timer cycles all the circulating pumps that are attached to theExpandable Switching Relay at the selected time interval. The timeinterval can be set for the pumps to run for either 30 seconds every 2weeks or for 4 minutes every 24 hours.

Low Limit (ZC) Operation: When the dip switch is set to ON and theboiler drops below the set low limit (terminal ZC connected to boiler), all zone circulating pumps will stop. When the boiler rises above the setlow limit, the zone circulating pumps are allowed to operate.

End Switches (Dry Contacts): The main end switch closes when anyzone thermostat calls for heat and the mode switch is set to NORMAL.The main end switch also closes when the mode switch is set to RESETand a PC Series boiler reset power control is calling for heat. The priori-ty end switch closes only when the priority zone thermostat or aquastatis calling for heat.

Expansion Connections: Set the expansion switch to MASTER on theswitching relay that has the designated priority zone or is utilizing thePC Series plug-in option. Set all other daisy chained controls to SLAVE.Using thermostat wire (18-22 gauge) connect between terminals A, B, Con the master control to the corresponding A, B, C on the SLAVE con-trol(s). Controls may be daisy chained up to 20 zoning panels using anycombination of -EXP controls (120 zones if all are 6 zone panels).

Thermostat Input (24 vac):

R Hot side of transformer. Connect to R on thermostat.W Switched R signal from thermostat. Connect to W on thermostat.C Common side of transformer. Connect to COM on

thermostat (optional).NET Network terminals 1 & 2 are tied together for wiring conveniencewhen using communicating style thermostats (optional).

120 VAC Connections (N is Neutral, H is Hot):

Power Input Connect 120 Volt AC powerPrimary Primary Pump (optional)Zone 1-5 Circulator ZonesPriority Zone 6 Priority Zone (if enabled) or Zone 6N/C Zone 6 Normally closed terminals for the Priority Zone.

WIll deactivate on a Priority Zone call.

Cold Start Boiler Application


SR506-EXP-4 6 with Priority 120/60/1 VAC 20 amps 121/4" 8" 3"

All circulator relay connections, including ZC/ZR, are rated 1/3 hp (6 FLA, 36 LRA) at 120 VAC.End switch connections are rated 24 VAC, 1 amp.All thermostat connections supply a 24 VAC class 2 output.

For more wiring diagrams, visit www.taco-hvac.com.


SLAVEZONE PRIORITY ON

RESETPRIMARY PUMP FUNCTION ON

POST PURGE ONPRIORITY PROTECTION ON

PUMP EXERCISE ON30 SEC/2 WK

MASTEROFFNORMALOFFOFFOFFOFF4 MIN/24 HOUR


Dip Switch Settings:

External Diagnostics: Externally visible lights show full functionalityof the switching relay. The green light should always be on, indicatingthat power is connected. When the thermostat calls for heat, both theappropriate circulator and red indicating light are energized.

Features:Front External Indicator LightsIdeal for RetrofittingPrimary Circulator OutputSimplified WiringPlug-In Power ControlsSealed RelaysCompact DesignFuse Protected100% Factory TestedTwo Isolated End Switches

Expandable to 20 Zoning Panels (120zones if all are 6 zone panels)

Contractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL Approved24 volt Power Input or Output

TerminalExtended 3 Year WarrantyMade in the USA

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this devicemust accept any interference received, including interference that may cause undesired operation.

102

Instruction SheetZVC403/404/405/406-4 Zone Valve Control

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4

ZVC 406 – 4

SIX ZONEZONE VALVE CONTROL

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

POW

ER IN

24 V

AC

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

TOCIRCULATOR

DRYCONTACTS

N/O COM N/C

PUMP ENDSWITCH


THERMOSTATS (24VAC)

T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

TO: BOILERAQUASTAT RELAY

ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6ISOLATEDX X



T

T

X X

ZONE 6PRIORITY

OFF

ON


FUSE5 AMP

R W


See NOTE 1

R W R W R WC C CR W CC

FUSE5 AMP

R W C



A

B


Operation/External Diagnostics: When any thermostat calls forheat, the appropriate zone valve is energized and the yellow lightgoes on. When the zone valve is fully open, the red light goes onand energizes the end switch relay. The green light should alwaysbe on, indicating that power is connected.Priority Operation: When zone 6 is switched to the priority settingand is actuated, all other zones will stop operation until zone 6 is sat-isfied. When zone 6 is not switched to priority, all zones will operateindependently. Note: When a circulator is used on the priority zoneinstead of a zone valve, jumper 3 and 4 of the priority zone.Priority Protection Operation: When the priority zone calls con-tinuously for more than one hour, power is returned to all theother zones, allowing each zone to function independently. Oncethe priority zone is satisfied, the control's auto-reset is activatedand the priority zone is again allowed to have priority for up to onehour starting from when it calls next.The Taco Connection: Combine the reliability of the Taco ZoneValves, Priority Zoning Circulators, Thermostats, and the “00” family

of circulators with the advanced features of the Taco Zone Controls toachieve total system integration. No matter the application, Taco nowprovides the products to maximize system performance while simpli-fying both installation and service.Features: External Indicator Lights

Switchable PriorityPriority ProtectionSimplified WiringWorks with 2, 3, or 4-Wire Zone ValvesCompact DesignFuse Protected100% Factory TestedIsolated End SwitchExtra Set of Dry ContactsContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL ApprovedSturdy Screw ConnectionsExtended 3 Year WarrantyMade in the USA

Wiring Diagram

N/O COM N/C

PUMP ENDSWITCH


X X

DHWPUMP

SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.SECONDARY PUMP COMES ON WHEN ANY ZONE CALLS EXCEPT PRIORITY ZONE.


PUMP

120VAC

HOT

NEUTRAL

Optional Systemand/or DHW and/orSecondary Circulators

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference thatmay cause undesired operation.


Specifications:PRODUCT NUMBER INPUT MAX 24 VAC TYPE 1 ENCLOSURENUMBER OF ZONES VOLTAGE OUTPUT @ 25°C WIDTH HEIGHT DEPTHZVC406-4 6 with Priority 120/60/1 VAC, 3A 24 VA per Zone 121⁄4" 8" 3"

40 VA per Transformer

The pump end switches are rated 1⁄6 hp, 5 amps at 120 VAC. The main and priority end switch connectionsare rated 24 VAC, 1 amp. All thermostat and zone valve connections supply a 24 VAC class 2 output.



Printed in USA

Copyright 2010

TACO, Inc.

103

Instruction SheetZVC404-EXP & ZVC406-EXP Zone Valve Control

1 2 3 4ZONE 1

1 2 3 4ZONE 2

1 2 3 4ZONE 3

1 2 3 4ZONE 4

1 2 3 4ZONE 5

1 2 3 4ZONE 6

PRIORITYZONE


TACO3 WIRE

ZONE VALVE

123

JUMPER3 & 4

MOTOR ENDSWITCH


JUMPER3 & 4

SEE NOTE


24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER

120 VACINPUT

WHITE

BLACK

POW

ER IN

24 V

AC

24 VAC

FA

CTO

RYIN

STA

LLED

TRA

NSF

ORM

ER 120 VAC

INPUT

WHITE

BLACK

TOCIRCULATOR

DRYCONTACTS

N/O COM N/C

PUMP ENDSWITCH


SLAVEPRIORITY ON

RESETPOST PURGE ON


30 SEC/2 WK


NOTE: When a circulator is usedon the priority zone instead of azone valve, jumper 3 and 4 ofthe priority zone.


T STAT 1 VALVE 1

T STAT 2 VALVE 2

T STAT 3 VALVE 3

T STAT 4 VALVE 4

VALVE 5

T STAT 6 VALVE 6

POWER

LEDINDICATORS

T STAT 5

TO: "TT" ON BOILER


ZONE 1 ZONE 2

ZONE 3





X X

POWERCONTROLS

ACCESSORYPORT

FUSE5 AMP

FUSE5 AMP



A

B


Operation/External Diagnostics: When any thermostat calls for heat,the appropriate zone valve is energized and the yellow light goes on.When the zone valve is fully open, the red light goes on and energizesthe end switch relay. The green light should always be on, indicatingthat power is connected.Priority Operation: When the priority dip switch is set to ON and thepriority zone is actuated, all other zones will stop operation until pri-ority zone is satisfied. When not switched to priority, all zones willoperate independently.Mode Operation: When the dip switch is set to NORMAL, the endswitch relay will be energized if any zone is in operation. When the switchis set to RESET, the end switch relay will only be energized if the priorityzone is in operation, or through the operation of a plug-in reset control.Post Purge Operation: When the dip switch is set to ON, the priori-ty zone output will stay energized for 2 minutes after its thermostat oraquastat is satisfied, but not operate the boiler.Priority Protection Operation: When the dip switch is set to ON, andif the priority zone calls continuously for more than one hour, poweris returned to all the other zones, allowing each zone to function inde-pendently. Once the priority zone is satisfied, the control's auto-reset isactivated and the priority zone is again allowed to have priority for upto one hour starting from when it calls next. Pump Exercise Operation: When the dip switch is set to ON, the solidstate timer cycles all the zone valves and circulating pumps that areattached to the Expandable Zone Valve Control at the selected timeinterval. The time interval can be set for the valves and pumps to runfor either 30 seconds every 2 weeks or for 4 minutes every 24 hours.End Switches (Dry Contacts): The main end switch closes when anyzone thermostat calls for heat and the mode switch is set to NORMAL.The main end switch also closes when the mode switch is set to RESETand a PC Series boiler reset power control is calling for heat. The priority

end switch closes only when the priority zone thermostat or aquastat iscalling for heat.Expansion Connections: Set the expansion switch to MASTER on theswitching relay that has the designated priority zone or is utilizing thePC Series plug-in option. Set all other daisy chained controls to SLAVE.Using thermostat wire (18-22 gauge) connect between terminals A, B,C on the master control to the corresponding A, B, C on the SLAVE con-trol(s). Controls may be daisy chained up to 20 zoning panels using anycombination of -EXP controls (120 zones if all are 6 zone panels).Thermostat Input (24 vac):

R Hot side of transformer. Connect to R on thermostat.W Switched R signal from thermostat. Connect to W on

thermostat.C Common side of transformer. Connect to COM on

thermostat (optional).NET Network terminals 1 & 2 are tied together for wiring convenience

when using communicating style thermostats (optional).Power Input (120 vac):Connect neutral (white) leads on transformers to 120 volts acneutral power supply.Connect hot (black) leads on transformers to 120 volts achot power supply.Pump End Switch (Dry Contacts):Connect hot power supply to the right side of the pump end switchterminal on board.Connect hot input lead of the circulator to the left side of the pumpend switch terminal on board.Zone 6 Pump End Switches (Dry Contacts): See Diagram.

N/O Normally open terminal of the priority zone relay.COM Common terminal of the priority zone relay.N/C Normally closed terminal of the priority zone relay.

End Switch Pump Neutral Connections:Connect neutral power supply directly to neutral lead on circulator(s).


Wiring Diagram

N/O COM N/C

PUMP ENDSWITCH


X X

DHWPUMP

SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.SECONDARY PUMP COMES ON WHEN ANY ZONE CALLS EXCEPT PRIORITY ZONE.


PUMP

120VAC

HOT

NEUTRAL

Optional Systemand/or DHW and/orSecondary Circulators

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference thatmay cause undesired operation.

Specifications:PRODUCT NUMBER INPUT MAX 24 VAC TYPE 1 ENCLOSURENUMBER OF ZONES VOLTAGE OUTPUT @ 25°C WIDTH HEIGHT DEPTH

ZVC406-EXP-4 6 with Priority 120/60/1 VAC, 3A 24 VA per Zone 121⁄4" 8" 3"40 VA per Transformer

The pump end switches are rated 1⁄6 hp, 5 amps at 120 VAC. The main and priority end switch connectionsare rated 24 VAC, 1 amp. All thermostat and zone valve connections supply a 24 VAC class 2 output.



Printed in USA

Copyright 2010

TACO, Inc.

104

Instruction SheetHydro Air Fan Controls

Operation HAFC101 and 201:The Hydro Air Fan Control is an interfacebetween the thermostat and air handler. Italso has an isolated end switch to start theboiler and/or pump. When the thermostatcalls for heat, the Fan Control energizes theend switch relay and allows the fan to operateat low speed when the water is above theoptional aquastat setting. When the thermo-stat calls for cooling, the Fan Control energizesthe condenser and operates on high speed.

Additional HAFC201 Operations:Selectable one, three or four minute delay onfan operation in heating mode. Selectablepump exercise activates circulator but doesnot enable boiler contacts. Two minutes every24 hours minimizes the chance of bacteriabuild-up in an open loop system. Thirty sec-onds every two weeks minimizes seasonalstart-up problems generally associated withharsh water conditions. Optional aquastat orthermostat can be connected to FreezeProtection TT terminals to reduce the chanceof pipes freezing by energizing the pump drycontacts (boiler contacts not activated.)

Switch Settings (HAFC201):1 1 minute on fan delay, in heating mode2 3 minute on fan delay, in heating mode

1&2 4 minute on fan delay, in heating mode3 Pump dry contact activated for 2 min-

utes every 24 hours (boiler contacts notactivated)

4 Pump dry contacts activated for 30 sec-onds every two weeks (boiler contacts not activated)

External Diagnostics:The external lights show full functionality ofthe Hydro Air Fan Control. The green lightshould always be on, indicating that power isconnected. Red lights indicate fan operationfor heating and cooling modes.

HAFC201-4HYDRO AIR FAN CONTRL

THERMOSTAT

POWER

HEAT CALL

LEDINDICATORS

THERMOSTAT

T

C R W Y GAQUASTATS

T T

HAFC201-4

COOL FAN

HEAT FAN

BOILERC


WATERCOIL

FREEZEPROT.

T T

X X

PUMP

1 MIN

FAN

DE

LAY

3 MIN

FAN

DE

LAY

2MIN

/24HR

or 30SE

C/2W

K

PU

MP

EX

ER

CIS

E

OFF O

N




NO

TE: For 4 minute

ON

DELA

Y of Heating

Fan,sw

itch 1 and 3 M

IN O

ND

ELAY to O

N p

osition.

FANRELAY

LIN

E24

VA

C

OUTDOORCONDENSER

UNIT

JUMPER

CIRCULATOR

(or to “T T” onswitching relay)


H

N

120 VACINPUT

M

HAFC101-4HYDRO AIR FAN CONTRL

THERMOSTAT

POWER

H2O COIL

LEDINDICATORS

C R W Y G

AQUASTATT T

HAFC101-4

HIGH FAN

LOW FAN

BOILERC


THERMOSTAT

TTo: Aquastaton Return Lineof Hydro Coil


OUTDOORCONDENSER

UNIT

FANRELAY

LIN

E24

VA

C

LOW

HIG

H

M


Terminal Description:Thermostat:C Optional: Common side of transformer W White - Heating signal

to power some styles of thermostats Y Yellow - Condenser signalR Red - Hot side of transformer used to G Green - Fan signal

switch all functionsWater Coil Aquastat:TT Connect to aquastat at air handler to control operation of the fan when

in the heating mode. Install a jumper if the aquastat is not usedFreeze Protection Aquastat:TT Connect to aquastat or thermostat to sense low ambient temperature.

Reduces the chance of pipes freezing by energizing the pump dry contacts.Pump Dry Contacts:XX May switch pump directly by bringing in external line voltage or connect

to “T T” on a switching relay.Boiler Dry Contacts:XX Connect to the boiler or “T T” terminals on a switching relay.Air Handler:C Common side of transformer to power the Fan ControlR Red - Hot side of transformer used to switch all functionsY Yellow - Condenser signal

One Speed Motor:Glow Connect the fan to the relay. Keep the jumper installed between Ghigh and Glow.

Two Speed Motor:Ghigh Remove jumper and connect Ghigh to the high speed fan relay and

connect Glow to the low speed fan relay.

Specifications: ** Model number changed from SR501-FPRODUCT NUMBER POWER INPUT MAXIMUM RELAY THERMOSTAT SINGLE PHASE MOTOR DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD TYPE CURRENT RATING (RELAY) WIDTH HEIGHT DEPTH

HAFC101-4** 1 Zone 24 VAC Input 5 amps DPDT .18 1/6 HP(5A) @120VAC 4 1/4" 5 1/4" 2 3/4"HAFC201-4•• 1 Zone 24 VAC Input 5 amps DPDT .18 1/6 HP(5A) @120VAC 4 1/4" 5 1/4" 2 3/4"The Hydro Air Fan Controls are relay type DPDT, have a thermostat current of .18 and a single phase motor rating per zone of 1/6 HP (5A) @ 120 VAC.

* Both HAFC101 and 201 capable of 1 and 2 speed applications

WARNING: Wiring connections must bemade in accordance with all applicable elec-trical codes. Use copper wire only. 120 VACwiring must have a minimum temperaturerating of 75°C. Failure to follow this instruc-tion can result in personal injury or deathand/or property damage. 12-18 gauge wirerecommended for 120 VAC connections,14-22 gauge wire for thermostat connec-tions, and 14-22 gauge wire for 24 VACsource connections.

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any inter-ference received, including interference that may cause undesired operation.



Printed in USA

Copyright 2010

TACO, Inc.

105

Standard Terms and Definitions

Switching Relay: Transformer and relay in one box, which allows a low voltage thermostat to control a line voltage load (circulator),with an isolated end switch that can energize the boiler.

Zone Valve Control: Transformer and relay in one box, which allows a low voltage thermostat to control a low voltage zone valve, withan isolated end switch that can energize the boiler and/or circulators.

Dry Contacts: Set of relay contacts that make and beak, where no voltage is present. Usually can switch 24 or 120 VAC.

Isolated End Set Switch: Set of dry contacts that make when a zone calls for heat. Usually connected to a boiler’s aquastat TT.

Mode Switch: Switch set to NORMAL – When any zone calls for heat, the end switch will make and fire the boiler.Switch set to RESET – When any zone calls for heat, a heat demand signal is given to external add-on reset control and it controlsboiler operation.Also when the priority zone calls for heat and is switched to priority, the end switch will override reset control andfire boiler to high limit.

TT: Where thermostat or aquastat connects on a heating control.

XX: Denotes Isolated End Switch.

Low Voltage: 24 VAC for most HVAC systems.

Line Voltage: Normally 120 VAC relative to ground.

H or L1: Hot side of line voltage.

N or L2: Neutral side of line voltage.

ZR: 120 VAC (Hot) signal from switching relay to boiler’s operating aquastat to fire the burner to high limit when any zone calls forheat. Also ideal for controlling primary circulator.

ZC: 120 VAC (Hot) signal from boiler’s operating aquastat to switching relay allowing circulator(s) to run when aquastat is above theset low limit.

Cold Start: A boiler that fires only when there is a call for heat.

Tankless Coil: A method of heating domestic water utilizing a heat exchanger inside a boiler.The boiler also maintains heat year roundto deliver hot water on demand.

DHW Heater: A method of heating domestic water utilizing a heat exchanger and storage tank.

Transformer: A component for increasing or reducing AC voltage. Rated in VA (volts x amps).

OHMS Law: Example: A 24 volt, 40 VA transformer can produce how much current?

Current = VA / Voltage 40 / 24 = 1.6 Amps

I = E/R where I = Current in AmpsR = E/I R = Resistance in OhmsE = I x R E = Volts

W = E x I W = Watts or VAI = W(VA)/E

RELAY CONTACTS:

N/C: Normally closed connection of a relay, when not energized.N/O: Normally open connection of a relay, when not energized.Com: The common terminal for normally open and normally closed.Pole: The number of independent circuits of a switch or relay.

Throw: The number of settings which a switch or relay can have.

DPDT = Double Pole Double Throw

N/O N/C N/C N/O3 4 4 6 6 5

COM COM

TACO

Zon

e Co

ntro

ls Cr

oss-

Refe

renc

e

106

TA

CO

AR

GO

ER

IEH

ON

EY

WE

LL

SW

ITC

HIN

G R

EL

AY

S

1 Z

one

Switc

hing

Rel

ay (

DPD

T)

1 Z

one

Switc

hing

Rel

ay1

Zon

e Sw

itchi

ng R

elay

with

Out

door

Res

et2

Zon

e Sw

itchi

ng R

elay

with

Pri

ority

3 Z

one

Switc

hing

Rel

ay w

ith P

rior

ity4

Zon

e Sw

itchi

ng R

elay

with

Pri

ority

6 Z

one

Switc

hing

Rel

ay w

ith P

rior

ity

SR

501

SR

501-

HC

SR

501-

OR

SR

502

SR

503

SR

504

SR

506

AR

822I

I

AR

-861

-2II

(3)

AR

-861

-3II

(3)

SR

100

SR

201

SR

301

SR

601

R60

1 (4

)

RA

89A

(2),

RA

845A

(1),

RA

832A

(1),

R88

45U

, R

A88

9A

EX

PAN

DA

BL

E S

WIT

CH

ING

RE

LA

YS

1 Z

one

Switc

hing

Rel

ay w

ith P

rior

ity3

Zon

e Sw

itchi

ng R

elay

with

Pri

ority

4 Z

one

Switc

hing

Rel

ay w

ith P

rior

ity6

Zon

e Sw

itchi

ng R

elay

with

Pri

ority

SR

501-

EX

PS

R50

3-E

XP

SR

504-

EX

PS

R50

6-E

XP

AR

M-3

P (5

,6)

AR

M-4

P (5

,6)

AR

M-6

P (5

,6)

AQ

2504

2B (9

)

ZO

NE

VA

LVE

CO

NT

RO

LS

3 Z

one

Valv

e C

ontr

ol w

ith P

rior

ity4

Zon

e Va

lve

Con

trol

with

Pri

ority

5 Z

one

Valv

e C

ontr

ol w

ith P

rior

ity6

Zon

e Va

lve

Con

trol

with

Pri

ority

ZV

C40

3 (7

)Z

VC

404

(7)

ZV

C40

5 (7

)Z

VC

406

(7)

AZ

-3A

Z-4

PA

Z-5

AZ

-6P

VL5

00 (

8)V

L500

(8)

EX

PAN

DA

BL

E Z

ON

E V

ALV

E C

ON

TR

OL

S

4 Z

one

Valv

e C

ontr

ol w

ith P

rior

ity6

Zon

e Va

lve

Con

trol

with

Pri

ority

ZV

C40

4-E

XP

ZV

C40

6-E

XP

AQ

2504

4B (9

)

107

TACO

Zon

e Co

ntro

ls Cr

oss-

Refe

renc

e (C

ontin

ued)

NO

TE

S:

1.D

oes

not

have

bot

h no

rmal

ly o

pen

and

norm

ally

clo

sed

cont

acts

.2.

Has

onl

y on

e se

t of

nor

mal

ly o

pen

cont

acts

(SP

ST).

3.D

oes

not

have

opt

iona

l pri

ority

.4.

Can

be

expa

nded

to

five

and

six

zone

s w

ith t

he a

dditi

on o

f EX

P10

rela

ys.

5.A

rgo

AR

M u

nits

are

exp

anda

ble

to 1

0 zo

nes

usin

g sp

ecia

l con

trol

s (A

RM

-1,A

RM

-4)

with

a p

hone

jack

.TA

CO

sw

itchi

ng r

elay

s ca

n be

exp

ande

d up

to

120

zone

s us

ing

any

com

bina

tion

of -

EXP

mod

els

with

no

spec

ial c

onne

ctio

ns.

6.In

clud

es o

nly

one

data

por

t fo

r ad

ding

dat

a po

rt m

odul

es.

7.A

ll TA

CO

zon

e va

lve

cont

rols

incl

ude

an e

xtra

set

of d

ry c

onta

cts

(N/O

,Com

mon

,N/C

).8.

VL5

00 is

onl

y 5

zone

s,4

norm

al a

nd 1

pri

ority

.9.

Use

with

Hon

eyw

ell A

Q10

00 t

herm

osta

ts.

TA

CO

AR

GO

ER

IEH

ON

EY

WE

LL

AD

D-O

N P

OW

ER

CO

NT

RO

LS

Boile

r R

eset

Con

trol

2-St

age

Boile

r R

eset

Con

trol

Vari

able

Spe

ed P

ump

Inje

ctio

n M

ixin

g C

ontr

ol

PC

700

PC

702

PC

705

DP

M-2

BB

1200

BB

3000

AQ

2511

0B

AQ

2540

0B

FAN

CO

NT

RO

LS

1 Z

one

Hyd

ro A

ir F

an C

ontr

ol (

1 or

2 S

peed

)1

Zon

e H

ydro

Air

Fan

Con

trol

with

Tim

e D

elay

s (1

or

2 Sp

eed)

HA

FC10

1H

AFC

201

AR

H-1

, AR

H-2

, AR

H-3

WA

300

CONTROLS MADE EASY.®

TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.

Visit our web site at: http://www.taco-hvac.com

Printed in USA

Copyright 2010

TACO, Inc.

Documents

The All New . . . TACO ZONE CONTROLS WIRING GUIDE€¦ · boiler control power relay 1 relay 2 typical wiring sr501-hc-4 – one zone switching relay with or without boiler enable