TACO ZONE CONTROLS WIRING GUIDEPages
Switching Relays – Single Zone Wiring 2 – 2
Switching Relays – Oil Boiler Wiring Safety Notice 2 3 – 4
Switching Relays – NON EXP Connected Together with Priority 5 – 11
Switching Relays – EXP Connected Together with Priority 12 – 14
Switching Relays – Multiple Indirect Hot Water Heaters 15 – 16
Switching Relays – EXP Connected To Reset Controls (PC700, 702 & 705) 17 – 28
Zone Valve Controls – NON EXP Connected Together with Priority 29 – 34
Zone Valve Controls – EXP Connected Together with Priority 35 – 38
Zone Valve Controls – Connected To Reset Controls (PC700, 702 & 705) 39 – 46
Hydro Air Fan Controls (HAFC 101 & 201) 47 – 51
Specialty Thermostat and Zone Valve Wiring 52 – 56
Radiant Mixing Block 57 – 58
X-Pump Block 59 – 61
iSeries Mixing Valves 62 – 63
Low Water Cutoffs and Electric Water Feeders 64 – 79
Aquastat Wiring 80 – 86
Instruction Sheets 87 – 97
Standard Terms and Definitions – 98
Cross Reference 99 – 100
Do it once.Do it right.
© Taco Catalog No. 100-9.0 Effective Date: July 1, 2010Supersedes Date: July 1, 2007
TACO Zone Control Product Information
Switching RelaysProduct No. DescriptionSR501 1 Zone Switching RelaySR501-845RP 1 Zone Switching Relay Replacement PC Board for
Honeywell R845, RA89A, RA832 or Comparable RelaySR502 2 Zone Switching Relay with PrioritySR503 3 Zone Switching Relay with PrioritySR504 4 Zone Switching Relay with PrioritySR506 6 Zone Switching Relay with Priority
Switching Relays with PowerPort Options and Expandable to 20 ZonesProduct No. DescriptionSR501-EXP 1 Zone Switching RelaySR503-EXP 3 Zone Switching Relay with Priority and 3 PowerPortsSR504-EXP 4 Zone Switching Relay with Priority and 3 PowerPortsSR506-EXP 6 Zone Switching Relay with Priority and 3 PowerPorts
Zone Valve ControlsProduct No. DescriptionZVC403 3 Zone Valve ControlZVC404 4 Zone Valve Control with PriorityZVC405 5 Zone Valve ControlZVC406 6 Zone Valve Control with Priority
Zone Valve Controls with PowerPort Options and Expandable to 20 ZonesProduct No. DescriptionZVC404-EXP 4 Zone Valve Control with Priority and 2 PowerPorts ZVC406-EXP 6 Zone Valve Control with Priority and 2 PowerPorts
Plug-In PowerPort Cards (For use with all -EXP controls)Product No. DescriptionPC600 Post Purge Timer Plug-In CardPC605 Priority Protection Plug-In CardPC610 Universal Timer/Pump Exercise Plug-In Card
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 Hydro Air Fan ControlHAFC201 Hydro Air Fan Control with Optional Time Delays
Do it once.Do it right.
2
AT
TO: 1
20 V
AC
PO
WER
CIR
CU
LATO
R
120
VAC
INPU
T
THER
MO
ST
RW
TT
CO
M
24 VAC
N/O
N
/C
N/C
N
/ON
H3
44
66
5
TO: Z
C
SR50
11
ZO
NE
SWIT
CH
ING
REL
AY
POW
ER
T S
TAT
TO: Z
RALT
ERN
AT
IVE
WIR
ING
(TA
NK
LESS
CO
IL)
T
SR50
1 Sw
itchi
ng R
elay
Wiri
ng
AT
TO: 1
20 V
AC
POW
ER
CIR
CU
LATO
R
JUM
PE
R
120
VAC
INPU
T
THER
MO
ST
RW
TT
CO
M
24 VAC
N/O
N
/C
N/C
N
/ON
H3
44
66
5 TO: T
T O
N B
OIL
ER
SR50
11
ZO
NE
SWIT
CH
ING
REL
AY
POW
ER
T S
TAT
TY
PIC
AL
WIR
ING
(CO
LD S
TA
RT
)
T
TO: 1
20 V
AC
PO
WER
CIR
CU
LATO
R
RW
TT
CO
M
24 VAC
N/O
N
/C
N/C
N
/ON
H3
44
66
5 TO: T
T O
N B
OIL
ER
SR50
11
ZO
NE
SWIT
CH
ING
REL
AY
POW
ER *
T S
TAT
*
ALT
ERN
AT
IVE
WIR
ING
(24 V
AC
PO
WER
ED I
NP
UT
SIG
NA
L)
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
ON
AN
D O
FF W
ITH
24
VAC
SIG
NA
L. P
OW
ER L
IGH
TW
ILL
ALW
AYS
BE
OFF
.
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.
NOTE: No tankless coil priority.
3
(cont.)
NOTE: Tankless coil has priority.
THREE ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
THERMOSTAT
FUSE 1 AMP
24 VACPOWER
ZONE 1 ZONE 2 ZONE 3
120 VOLT CIRCULATORS ZC X1
ZONE1 ZONE2 ZONE3
SR 503
ZONE 2
POWERZONE 1
ZONE 3
L1 L2 T T
LINE VOLTAGEOIL BURNER RELAY
CIRCULATORON BOILER
(IF ATTACHED)
B2
C1
B1ZR
HONEYWELL L8124OR EQUAL
120 VAC INPUT
C2
ZC
THERMOSTAT
L1 L2
(NEUTRAL)(HOT)
CIRCUITBREAKER
CUSTOMEREMERGENCY
SWITCH
THERMALFUSE
(FIROMATIC)
SERVICESWITCH
LOWWATERCUTOFF
N P HX2ZR
NOTE: The boiler operating control’s ZC terminal will see the load of the circulator(s).
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
THERMOSTATS
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VACPOWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
L1 L2 T T
LINE VOLTAGEOIL BURNER RELAY
CIRCULATORON BOILER
(IF ATTACHED)
B2
C1
B1ZR
HONEYWELL L8124OR EQUAL
120 VAC INPUT
C2
ZC
THERMOSTAT
L1 L2
(NEUTRAL)(HOT)
CIRCUITBREAKER
CUSTOMEREMERGENCY
SWITCH
THERMALFUSE
(FIROMATIC)
SERVICESWITCH
LOWWATERCUTOFF
4
5
SR502/503 Switching Relay Controlling Another SR502/503 Switching Relay
SR 503
24 VACPOWER
FUSE 1 AMP
ZONE1 ZONE2 ZONE3
120 VOLT CIRCULATORS
ZONE1 ZONE2 ZONE3
TO: "TT" ON AQUASTAT CONTROL
JUMPERN P ZC H X ZR1
X2
ZONE 2
POWERZONE 1
ZONE 3
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
TT T
SR 503 ZONE1 ZONE2 ZONE3
24 VACPOWER
FUSE 1 AMP
120 VOLTCIRCULATORS
ZONE1 ZONE2 ZONE3
120 VAC POWER
JUMPERN P ZC H X ZR1
X2
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
TA T
BOILER
H
N
SLAVE
MASTER
AQUASTATON DHWHEATER
ZONE 2
POWERZONE 1
ZONE 3
DHWHEATER
CIRCULATOR
PRIORITY ONVIA JUMPERPLACEMENT
PRIORITY OFFVIA JUMPERPLACEMENT
6
SR502/503 Switching Relay Controlling Another SR504/506 Switching Relay
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ON
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VAC INPUT
TO: "TT" ON BOILER
ZONE1 ZONE2
ZONE3
ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
FUSE 1 AMP
24 VACPOWER
SR 506
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
ZONE 5ZONE 6
THERMOSTATS
BOILER
H
N
SR 503 ZONE1 ZONE2 ZONE3
24 VACPOWER
FUSE 1 AMP
120 VOLTCIRCULATORS
ZONE1 ZONE2 ZONE3JUMPERS
N P ZC H X ZR1
X2
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
TA T
MASTER
ZONE 2
POWERZONE 1
ZONE 3
SLAVET
PRIORITY ONVIA JUMPER PLACEMENT
REMOVEJUMPER
PRIORITYOFF
AQUASTATON DHWHEATER
7
Two SR504/506 Switching Relays Connected Together
BOILER
H
N
AAQUASTAT ONDHW HEATER
TT T
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
TT T
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VACPOWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
DHWHEATER
CIRCULATOR
OUTPUTNOTUSED
PRIORITYON
PRIORITYON
8
Priority Zoning Circulator Controlling SR504/506 Switching Relay
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ON
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VAC INPUT
TO: "TT" ON BOILER
ZONE1 ZONE2
ZONE3
ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
FUSE 1 AMP
24 VACPOWER
SR 506
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
ZONE 5ZONE 6
ONOFF
PRIORITY
POWER IN
120 VAC INPUT
THERMOSTAT BOILER PRIORITY
PRIORITY ZONING CIRCULATOR
PR-IN PR-OUT LIVE NEUT1 2 3 4
THERMOSTATS
BOILER
H
N
A
AQUASTAT ONDHW HEATER
MASTER
SLAVE
PRIORITYON
REMOVEJUMPER
PRIORITYOFF
T
9
Prio
rity
Zoni
ng C
ircul
ator
Con
trolli
ng 2
SR5
04/5
06 S
witc
hing
Rel
ays
ZO
NE
4 ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
SR 5
04
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
TT
T
BO
ILE
R
ZO
NE
4 ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
24 VACPOWER
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VAC
INPU
T
TO:
"TT"
ON
BO
ILER
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
SR 5
04
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
TT
T
H N
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
YW
ITH
OPT
ION
AL
PRIO
RITY
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
YW
ITH
OPT
ION
AL
PRIO
RITY
SL
AV
ES
LA
VE
PRIO
RITY
OFF
PRIO
RITY
OFF
TT
24 VACPOWER
ON
OFF
PRIO
RITY
POW
ER IN
TH
ERM
OST
AT
BO
ILER
PR
IORI
TY
PRIO
RITY
ZO
NIN
G C
IRC
ULA
TOR
PR-IN
PR-O
UT
LIVE
NEU
T1
23
4
AA
QU
AST
AT
ON
DH
W H
EATE
R
120
VAC
INPU
T
MA
ST
ER
PRIO
RITY
ON
REM
OVE
JUM
PER
REM
OVE
JUM
PER
SR50
2/50
3 Sw
itchi
ng R
elay
Con
trolli
ng 2
SR5
04/5
06 S
witc
hing
Rel
ays
ZO
NE
4 ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
SR 5
04
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
TT
T
BO
ILE
R
ZO
NE
4 ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
24 VACPOWER
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VAC
INPU
T
TO:
"TT"
ON
BO
ILER
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
SR 5
04
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
TT
T
H N
A
SR 5
03
ZO
NE1
Z
ON
E2
ZO
NE3
24 V
AC
POW
ER
FUSE
1 A
MP
ZO
NE1
Z
ON
E2
ZO
NE3
JUM
PER
N
P
ZC
H
X
ZR
1
X2
ZO
NE
2
POW
ERZ
ON
E 1
TWO
ZO
NE
SWIT
CH
ING
REL
AY
WIT
H O
PTIO
NA
L PR
IORI
TY
PRIO
RITY
ON
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
YW
ITH
OPT
ION
AL
PRIO
RITY
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
YW
ITH
OPT
ION
AL
PRIO
RITY
MA
ST
ER
SL
AV
ES
LA
VE
PRIO
RITY
OFF
PRIO
RITY
OFF
TT
TT
24 VACPOWER
ZO
NE
3
REM
OVE
JUM
PER
REM
OVE
JUM
PER
AQ
UA
STA
T O
ND
HW
HEA
TER
10
11
FOU
R Z
ON
E SW
ITC
HIN
G R
ELAY
WIT
H O
PTIO
NA
L PR
IORI
TY
ZO
NE
4
ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
SR 5
04
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
TT
T
BO
ILE
R
FOU
R Z
ON
E SW
ITC
HIN
G R
ELAY
WIT
H O
PTIO
NA
L PR
IORI
TY
ZO
NE
4
ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VAC
INPU
T
TO:
"TT"
ON
BO
ILER
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
SR 5
04
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
TT
T
H N
T
DH
WC
IRC
ULA
TORJUM
PER
RW
TT
CO
M
24 VAC
N/O
N
/C
N/C
N
/ON
H3
44
56
6
SR50
1PO
WER
T S
TAT
120
VAC
INPU
T
1 Z
ON
E SW
ITC
HIN
G R
ELA
Y
AQ
UA
STA
T O
N
DH
W H
EATE
RA
T
MA
ST
ER
SL
AV
ES
LA
VE
REM
OVE
JUM
PER
REM
OVE
JUM
PER
PRIO
RITY
OFF
PRIO
RITY
OFF
24 V
AC
POW
ER24
VA
CPO
WER
SR50
1 Sw
itchi
ng R
elay
Con
trolli
ng 2
SR5
04/5
06 S
witc
hing
Rel
ays
SR501-EXP Switching Relay Controlling Another SR504/506 Switching Relay
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ON
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VAC INPUT
TO: "TT" ON BOILER
ZONE1 ZONE2
ZONE3
ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
FUSE 1 AMP
24 VACPOWER
SR 506
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
ZONE 5ZONE 6
THERMOSTATS
BOILER
H
N
MASTER
SLAVET
REMOVEJUMPER
PRIORITYOFF
DHW CIRCULATOR
POWER
T STAT
TO: "TT" ON BOILER
AQUASTAT ONDHW HEATER
N ZC ZRH H HPOWERINPUT
120VACINPUT
120VACOUTPUT
CIRCOUTPUT
PRIORITYOUTPUT
RESETPOWER
CONTROLS
FUSE1 AMP
NORMAL
MASTER
SLAVE
ENDSWITCH
ZONEVALVETHERMOSTATEXPANSION
X COMT/WT/RX 1 12 243
JUMPER
TO: OPTIONAL ZONE VALVE OR iSeries MIXING VALVE
MODE
FUSE5 AMP
SR 501-EXP
A
12
SR50
1-EX
P Sw
itchi
ng R
elay
Con
trolli
ng a
ZVC
404/
406
Zone
Val
ve C
ontro
l
24 V
AC
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5Z
ON
E 6
MO
DE
NO
RMA
LRE
SET FUSE (7 AMP MAX)
TT
TT
TT
TT
TT
TT
ZO
NE
6 PR
IORI
TY
OFF
ON
ZVC
40
6
12
34
12
34
12
34
12
34
12
34
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
JUM
PER
3 &
4
TAC
O3
WIR
E Z
ON
E V
ALV
E
1 2 3
MO
TOR
END
SWIT
CH
THER
MO
STA
TTH
ERM
OST
AT
THER
MO
STA
T
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
, SEL
F C
LOSI
NG
)
T ST
AT
1
VALV
E 1
T ST
AT
2
VALV
E 2
T ST
AT
3VA
LVE
3T
STA
T 4
VALV
E 4
T ST
AT
5VA
LVE
5T
STA
T 6
VALV
E 6
POW
ER
SIX
ZO
NE
ZO
NE
VALV
E C
ON
TRO
LW
ITH
OPT
ION
AL
PRIO
RITY
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
N/O
CO
MZ
ON
E 6
RELA
YEN
DSW
ITC
H
EXTR
AEN
DSW
ITC
H
MA
INN
/C
TO B
OIL
ER A
QU
AST
AT
RELA
Y
BO
ILE
RHN
SYST
EMPU
MP
BOIL
ER T
URN
S O
N W
HEN
AN
Y Z
ON
E VA
LVE
OPE
NS.
12
34
ZO
NE
6
PRIO
RITY
ZO
NE
JUM
PER
3 &
4S
EE
NO
TE
Not
e: W
hen
a ci
rcul
ator
is u
sed
on t
hepr
iorit
y zo
ne in
stea
d of
a z
one
valv
e,ju
mpe
r 3
and
4 of
the
prio
rity
zone
.
TT
T
120
VAC
INPU
T
DH
WH
EATE
RC
IRC
ULA
TOR
POW
ER
T S
TAT
AQ
UA
STA
T O
ND
HW
HEA
TER
NZ
CZ
RH
HH
PO
WE
RIN
PU
T12
0VAC
INPU
T12
0VAC
OUTP
UTCI
RCOU
TPUT
PRIO
RITY
OUTP
UT
RESE
TPO
WER
CONT
ROLS
FUSE
1 AM
P
NORM
AL
MAS
TER
SLAV
E
END
SWIT
CHZO
NEVA
LVE
THER
MO
STAT
EXPA
NSIO
N
XCO
MT/
WT/
RX
11
22
43
JUM
PER
TO: O
PTIO
NA
L Z
ON
E VA
LVE
OR
iSer
ies
MIX
ING
VA
LVE
MOD
E
FUSE
5 AM
PSR 5
01-E
XP
ATO
BO
ILER
AQ
UA
STA
T RE
LAY
MA
ST
ER
SL
AV
E
SYST
EM P
UM
P TU
RNS
ON
WH
EN A
NY
ZO
NE
VALV
E O
PEN
SEX
CEP
T W
HEN
TH
E D
HW
HEA
TER
(SR5
01-E
XP)
CA
LLS.
13
14
2 Expandable Switching Relays Connected Together
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
BOILER
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: Off
120 VAC INPUT
H
N
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: NormalPriority Zone: On
1 2 3 4EXPANSION
1 2 3 4EXPANSION
SR504-EXP
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ONOFF
PRIORITY
120V RELAY
PLUG-IN CARDS
FUSE 1 AMP
SLAVE
MASTER
RESET NORMAL
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
TO: "TT" ON BOILER
ZONE1 ZONE2
ZONE3
ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
SR 506-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4ZONE 5ZONE 6
JUMPER
DHWCIRCULATOR
THERMOSTATS
SLAVE
MASTER A
AQUASTATON DHWHEATER
T
T
ZO
NE
4 ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
24 V
AC
POW
ER
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
SR 5
04
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
TT
T
BO
ILE
R
ZO
NE
4 ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
24 V
AC
POW
ER
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VAC
INPU
T
TO:
"TT"
ON
BO
ILER
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
SR 5
04
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
TT
T
H N
A
JUM
PER
JUM
PER
SR 5
02
ZO
NE1
Z
ON
E2
ZO
NE3
24 V
AC
POW
ER
FUSE
1 A
MP
ZO
NE1
Z
ON
E2
ZO
NE3
JUM
PERS
N
P
ZC
H
X
ZR
1
X2
ZO
NE
2
POW
ERZ
ON
E 1
TWO
ZO
NE
SWIT
CH
ING
REL
AY
WIT
H O
PTIO
NA
L PR
IORI
TY
A
PRIO
RITY
OFF
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
YW
ITH
OPT
ION
AL
PRIO
RITY
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
YW
ITH
OPT
ION
AL
PRIO
RITY
ZO
NE
NO
TU
SED
ZO
NE
NO
TU
SED
MA
ST
ER
SL
AV
ES
LA
VE
PRIO
RITY
ON
PRIO
RITY
ON
AQ
UA
STA
TS O
ND
HW
HEA
TERS
15
2 In
dire
ct W
ater
Hea
ters
with
Prio
rity
Conn
ecte
d to
Sta
ndar
d Sw
itchi
ng R
elay
s
16
BO
ILE
R
120
VAC
INPU
T
TO:
"TT"
ON
BO
ILER
H N
A
SR 5
02
ZO
NE1
Z
ON
E2
ZO
NE3
24 V
AC
POW
ER
FUSE
1 A
MP
ZO
NE1
Z
ON
E2
ZO
NE3
JUM
PERS
N
P
ZC
H
X
ZR
1
X2
ZO
NE
2
POW
ERZ
ON
E 1
TWO
ZO
NE
SWIT
CH
ING
REL
AY
WIT
H O
PTIO
NA
L PR
IORI
TY
A
PRIO
RITY
OFF
12
34
EXPA
NSI
ON
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
Y W
ITH
OPT
ION
AL
PRIO
RITY
ZO
NE
4 ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
24 V
AC
POW
ER
MA
STER
PLU
G-I
N C
ARD
S
RESE
T N
ORM
AL
SLAV
E
POW
ERC
ON
TRO
LIN
TERF
AC
E
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
SR 5
04-E
XP
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
JUM
PER
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rRe
set/
Nor
mal
: Nor
mal
Prio
rity
Zon
e: O
n
12
34
EXPA
NSI
ON
SR50
4-EX
P
T
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
Y W
ITH
OPT
ION
AL
PRIO
RITY
ZO
NE
4 ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
24 V
AC
POW
ER
MA
STER
PLU
G-I
N C
ARD
S
RESE
T N
ORM
AL
SLAV
E
POW
ERC
ON
TRO
LIN
TERF
AC
E
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
SR 5
04-E
XP
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
JUM
PER
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: S
lave
Rese
t/N
orm
al: N
orm
alPr
iorit
y Z
one:
Off
SR50
4-EX
P
T
DH
WC
IRC
ULA
TORS
AQ
UA
STA
TS O
ND
HW
HEA
TERS
MA
ST
ER
SL
AV
E
ZO
NE
NO
TU
SED
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
BOILER
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset
120 VAC INPUT
SYSTEMCIRCULATOR
POWER
T STAT
TO: "TT" ON BOILER
THERMOSTAT
N ZC ZRH H HPOWERINPUT
120VACINPUT
120VACOUTPUT
CIRCOUTPUT
PRIORITYOUTPUT
RESETPOWER
CONTROLS
FUSE1 AMP
NORMAL
MASTER
SLAVE
ENDSWITCH
ZONEVALVETHERMOSTATEXPANSION
X COMT/WT/RX 1 12 243
JUMPER
TO: OPTIONAL ZONE VALVE OR iSeries MIXING VALVE
MODE
FUSE5 AMP
SR 501-EXP
H
N
T
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
MASTER
EXISTINGZONECONTROL
T
PRIMARYSYSTEM
CIRCULATOR(Optional)
POWERT STAT
TO: "TT" ON BOILER
AQUASTAT ONDHW HEATER
N ZC ZRH H HPOWERINPUT
120VACINPUT
120VACOUTPUT
CIRCOUTPUT
PRIORITYOUTPUT
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X COMT/WT/RX 1 12 243
JUMPER
SR 501-EXP
A
RESET
POWERCONTROLS
FUSE1 AMP
NORMALMASTER
SLAVE
MODE
FUSE5 AMP
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
K1-A
K1-B K2-A K2-A
K1 K2
18
SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Switching Relay
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
POWERT STAT
TO: "TT" ON BOILER
AQUASTAT ONDHW HEATER
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X COMT/WT/RX 1 12 243
JUMPER
A
RESET
POWERCONTROLS
FUSE1 AMP
NORMAL
MODE
REMOVEJUMPERDHW
HEATERCIRCULATOR
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
SLAVE
N ZC ZRH H HPOWERINPUT
120VACINPUT
120VACOUTPUT
CIRCOUTPUT
PRIORITYOUTPUT
SR 501-EXPMASTER
SLAVE
FUSE5 AMP
K1-A
K1-B K2-A K2-A
K1 K2
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
PRIMARYSYSTEM
CIRCULATOR(Optional)
POWERT STAT
TO: "TT" ON BOILER
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X COMT/WT/RX 1 12 243
JUMPER
RESET
POWERCONTROLS
FUSE1 AMP
NORMAL
MODE
DHW HEATERCIRCULATOR
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
24 VAC
POWER IN
ZONE 2 ZONE 3 ZONE 4
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
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
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.
AQUASTAT ONDHW HEATERA
ZONE VALVE SYSTEMCIRCULATOR
N ZC ZRH H HPOWERINPUT
120VACINPUT
120VACOUTPUT
CIRCOUTPUT
PRIORITYOUTPUT
SR 501-EXPMASTER
SLAVE
FUSE5 AMP
K1-A
K1-B K2-A K2-A
K1 K2
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
DHW HEATERCIRCULATOR
POWERT STAT
TO: "TT" ON BOILER
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X COMT/WT/RX 1 12 243
JUMPER
RESET
POWERCONTROLS
FUSE1 AMP
NORMAL
MODE
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
24 VAC
POWER IN
ZONE 2 ZONE 3 ZONE 4
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
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
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.
AQUASTAT ONDHW HEATERA
ZONE VALVE SYSTEMCIRCULATOR
MASTER
SLAVE
N ZC ZRH H HPOWERINPUT
120VACINPUT
120VACOUTPUT
CIRCOUTPUT
PRIORITYOUTPUT
SR 501-EXPMASTER
SLAVE
FUSE5 AMP
K1-A
K1-B K2-A K2-A
K1 K2
19
SR501-EXP and PC700 Boiler Reset Control Connected to an ExistingTankless Coil Boiler – Zoning with Circulators
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
BOILERH
N
EXISTINGZONECONTROL
T
POWERT STAT
TO: "ZR" ON BOILER CONTROL
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X COMT/WT/RX 1 12 243
JUMPER
RESET
POWERCONTROLS
FUSE1 AMP
NORMAL
MODE
REMOVEJUMPER
PRIMARYSYSTEM
CIRCULATOR(Optional)
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
Boiler and Zone Control(s) need to be on same power supply (same circuit breaker).
TO: "ZC" ON BOILER CONTROL
N ZC ZRH H HPOWERINPUT
120VACINPUT
120VACOUTPUT
CIRCOUTPUT
PRIORITYOUTPUT
SR 501-EXPMASTER
SLAVE
FUSE5 AMP
K1-A
K1-B K2-A K2-A
K1 K2
SR501-EXP and PC700 Boiler Reset Control Connected to an ExistingTankless Coil Boiler – Zoning with Zone Valves
120 VACINPUT
BOILER H
N
EXISTINGZONECONTROL
POWERT STAT
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X COMT/WT/RX 1 12 243
JUMPER
RESET
POWERCONTROLS
FUSE1 AMP
NORMAL
MODE
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
Boiler and Zone Control(s) need to be on same power supply (same circuit breaker).
24 VAC
POWER IN
ZONE 2 ZONE 3 ZONE 4
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
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
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 SYSTEM
CIRCULATOR
MASTER
SLAVE
TO: "ZR" ON BOILER CONTROL
PRIMARYSYSTEM
CIRCULATOR(Optional)
TO: "ZC" ON BOILER CONTROL
N ZC ZRH H HPOWERINPUT
120VACINPUT
120VACOUTPUT
CIRCOUTPUT
PRIORITYOUTPUT
SR 501-EXPMASTER
SLAVE
FUSE5 AMP
K1-A
K1-B K2-A K2-A
K1 K2
20
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
Y W
ITH
OPT
ION
AL
PRIO
RITY
ZO
NE
4 ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
24 V
AC
POW
ER
MA
STER
1234
PLU
G-I
N C
ARD
S
RESE
T N
ORM
AL
SLAV
E
POW
ERC
ON
TRO
LIN
TERF
AC
E
THER
MO
STAT
S
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VAC
INPU
T
TO:
"TT"
ON
BO
ILER
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
JUM
PER
H N
ZONE
CONT
ROL
BOIL
SEN
OUT
SEN B
OIL
ER
SE
NS
OR
OU
TD
OO
RS
EN
SO
R
PC
700
BO
ILE
R
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rRe
set/
Nor
mal
: Res
etPr
iorit
y Z
one:
On
or O
ff
SR 5
04-E
XP
T
21
PC70
0 Bo
iler R
eset
Con
trol C
onne
cted
to E
XP S
witc
hing
Rel
ay
22
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
Y W
ITH
OPT
ION
AL
PRIO
RITY
ZO
NE
4 ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
24 V
AC
POW
ER
MA
STER
1234
PLU
G-I
N C
ARD
S
RESE
T N
ORM
AL
SLAV
E
POW
ERC
ON
TRO
LIN
TERF
AC
E
THER
MO
STAT
S
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VAC
INPU
T
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
JUM
PER
H N
ZONE
CONT
ROL
BOIL
SEN
OUT
SEN BO
ILE
R S
EN
SO
R
OU
TD
OO
RS
EN
SO
R
PC
702
STAG
E1
STAG
E2
BO
ILE
R#2
BO
ILE
R#1
DH
WD
EM
AN
DSW
ITC
H S
ETTI
NG
S
Mas
ter/
Slav
e: M
aste
rRe
set/
Nor
mal
: Nor
mal
Prio
rity
Zon
e: O
n or
Off
SR 5
04-E
XP
WIR
ING
NEE
DED
ON
LY IF
PRIO
RITY
ZO
NE
IS D
HW
SYST
EMC
IRC
ULA
TOR
(OPT
ION
AL)
T
PC70
2 2–
Stag
e Bo
iler R
eset
Con
trol C
onne
cted
to E
XP S
witc
hing
Rel
ay
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
Y W
ITH
OPT
ION
AL
PRIO
RITY
ZO
NE
4 ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
24 V
AC
POW
ER
MA
STER
1234
PLU
G-I
N C
ARD
S
RESE
T N
ORM
AL
SLAV
E
THER
MO
STAT
S
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VAC
INPU
T
TO:
"TT"
ON
BO
ILER
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
JUM
PER
HN
BO
ILE
R
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rRe
set/
Nor
mal
: Res
etPr
iorit
y Z
one:
On
or O
ff
ZONE
CONT
ROL
BOIL
SEN
OUT
SEN
BO
ILE
R S
EN
SO
R
OU
TD
OO
RS
EN
SO
R
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
RED
GRE
EN/G
ROU
ND
SR 5
04-E
XP
(SEE
NO
TE B
)
NO
TE A
:W
HEN
SYS
TEM
CIR
CU
LATO
R IS
CO
NN
ECTE
D T
O Z
R TE
RMIN
AL
ON
SW
ITC
HIN
G R
ELA
Y, T
HE
MO
DE
SWIT
CH
MU
ST B
E SE
T TO
NO
RMA
L.TH
E PC
705-
2 W
ILL
NO
T RE
SET
THE
BOIL
ER W
HEN
IN T
HE
NO
RMA
L M
OD
E. N
OTE
B:
WH
EN S
YSTE
M C
IRC
ULA
TOR
IS C
ON
NEC
TED
TO
RED
WIR
E O
N P
C70
5-2,
TH
E C
IRC
ULA
TOR
WIL
L O
PERA
TE O
NLY
WH
EN T
HER
MO
STA
T C
ALL
S FO
R H
EAT
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
EDO
FF S
O T
HA
T TH
E C
IRC
ULA
TOR
IS N
OT
AFF
ECTE
D B
Y O
UTD
OO
R TE
MPE
RATU
RE.
SYST
EMC
IRC
ULA
TOR
AN
D/O
R BO
ILER
(SEE
NO
TE A
)
T
23
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
24
PC700 Boiler Reset Control Connected to 2 EXP Switching Relays
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VACINPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
BOILER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: ResetPriority Zone: On or Off
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VACPOWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER H
N
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: No Priority
1 2 3 4EXPANSION
1 2 3 4EXPANSION
SR 504-EXP
SR 504-EXP
MASTER
SLAVE
SYSTEMCIRCULATOR(OPTIONAL)
T
T
25
PC702 2–Stage Boiler Reset Control Connected to 2 EXP Switching Relays
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On or Off
1 2 3 4EXPANSION
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#2
BOILER#1
DHWDEMAND
SR 504-EXP
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
MASTER
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPERH
N
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: No Priority
1 2 3 4EXPANSION
SR 504-EXP
SLAVE
SYSTEMCIRCULATOR(OPTIONAL)
T
T
26
PC705 Variable Speed Pump Injection Control Connected to 2 EXP Switching Relays
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VACINPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
BOILER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: ResetPriority Zone: On or Off
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPERH
N
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: No Priority
1 2 3 4EXPANSION
1 2 3 4EXPANSION
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
SR 504-EXP
SR 504-EXP
MASTER
SLAVE
SYSTEMCIRCULATOR(OPTIONAL)
(SEE NOTE A ON PAGE 23)
(SEE NOTE BON PAGE 23)
T
T
27
PC700 and PC705 Controls Connected to 2 EXP Switching Relays
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUTTO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
BOILER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: ResetPriority Zone: On or Off
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
H
N
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: No Priority
1 2 3 4EXPANSION
1 2 3 4EXPANSION
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
SYSTEM CIRCULATOR(OPTIONAL LOCATION)
(SEE NOTE A ON PAGE 23)
SR 504-EXP
SR 504-EXP
MASTER
SLAVE
JUMPER
(SEE NOTE BON PAGE 23)
T
T
28
PC702 and PC705 Controls Connected to 2 EXP Switching Relays
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On or Off
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
H
N
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: No Priority
1 2 3 4EXPANSION
1 2 3 4EXPANSION
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
SYSTEM CIRCULATOR(OPTIONAL LOCATION)
(SEE NOTE A ON PAGE 23)
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#2
BOILER#1
DHWDEMAND
SR 504-EXP
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
SR 504-EXP
MASTER
SLAVE(SEE NOTE BON PAGE 23)
T
T
24 V
AC
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5
FUSE (5 AMP MAX)
TT
TT
TT
TT
TT
ZVC
405
12
34
12
34
12
34
12
34
12
34
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
JUM
PER
3 &
4
TAC
O3
WIR
E Z
ON
E V
ALV
E
1 2 3
MO
TOR
END
SWIT
CH
THER
MO
STA
TTH
ERM
OST
AT
THER
MO
STA
T
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
, SEL
F C
LOSI
NG
)
T ST
AT
1
VA
LVE
1
T ST
AT
2
VA
LVE
2T
STA
T 3
VA
LVE
3T
STA
T 4
VA
LVE
4T
STA
T 5
VA
LVE
5PO
WER
FIVE
ZO
NE
ZO
NE
VALV
E C
ON
TRO
L
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
END
SWIT
CH
N/O
CO
MN
/C
TO B
OIL
ER A
QU
AST
AT
RELA
Y
POWER IN
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
BO
ILE
R
HN
SYST
EMPU
MP
SYST
EM P
UM
P A
ND
BO
ILER
TU
RN O
NW
HEN
AN
Y Z
ON
E VA
LVE
OPE
NS.
TT
T
29
ZVC4
03/4
05 w
ith S
yste
m P
ump
30
24 V
AC
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5Z
ON
E 6
MO
DE
NO
RMA
LRE
SET FUSE (7 AMP MAX)
TT
TT
TT
TT
TT
TT
ZO
NE
6 PR
IORI
TY
OFF
ON
ZVC
40
6
12
34
12
34
12
34
12
34
12
34
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
JUM
PER
3 &
4
TAC
O3
WIR
E Z
ON
E VA
LVE
1 2 3
MO
TOR
END
SWIT
CH
THER
MO
STA
TTH
ERM
OST
AT
THER
MO
STA
T
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
, SEL
F C
LOSI
NG
)
T ST
AT
1
VALV
E 1
T ST
AT
2
VALV
E 2
T ST
AT
3VA
LVE
3T
STA
T 4
VALV
E 4
T ST
AT
5VA
LVE
5T
STA
T 6
VALV
E 6
POW
ER
SIX
ZO
NE
ZO
NE
VALV
E C
ON
TRO
LW
ITH
OPT
ION
AL
PRIO
RITY
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN
24
VAC
FACTORYINSTALLED
TRANSFORMER 1
20 V
AC
INPU
T
WH
ITE
BLA
CK
N/O
CO
MZ
ON
E 6
RELA
Y
DRY
CO
NTA
CTS
END
SWIT
CH
EXTR
AEN
DSW
ITC
H
MA
INN
/C
TO B
OIL
ER A
QU
AST
AT
RELA
Y
BO
ILE
R
HN
SYST
EMPU
MP
AA
QU
AST
AT
ON
DH
W H
EATE
R
SYST
EM P
UM
P A
ND
BO
ILER
TU
RN O
NW
HEN
AN
Y Z
ON
E VA
LVE
OPE
NS.
12
34
ZO
NE
6
PRIO
RITY
ZO
NE
JUM
PER
3 &
4S
EE
NO
TE
Not
e: W
hen
a ci
rcul
ator
is u
sed
on t
hep
riorit
y zo
ne in
stea
d of
a z
one
valv
e,ju
mp
er 3
and
4 o
f the
prio
rity
zone
.
TT
T
ZVC4
04/4
06 w
ith S
yste
m P
ump
24 V
AC
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5Z
ON
E 6
MO
DE
NO
RMA
LRE
SET FUSE (7 AMP MAX)
TT
TT
TT
TT
TT
TT
ZO
NE
6 PR
IORI
TY
OFF
ON
ZVC
40
6
12
34
12
34
12
34
12
34
12
34
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
JUM
PER
3 &
4
TAC
O3
WIR
E Z
ON
E V
ALV
E
1 2 3
MO
TOR
END
SWIT
CH
THER
MO
STA
TTH
ERM
OST
AT
THER
MO
STA
T
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
, SEL
F C
LOSI
NG
)
T ST
AT
1
VALV
E 1
T ST
AT
2
VALV
E 2
T ST
AT
3VA
LVE
3T
STA
T 4
VALV
E 4
T ST
AT
5VA
LVE
5T
STA
T 6
VALV
E 6
POW
ER
SIX
ZO
NE
ZO
NE
VALV
E C
ON
TRO
LW
ITH
OPT
ION
AL
PRIO
RITY
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
N/O
CO
MZ
ON
E 6
RELA
YEN
DSW
ITC
H
EXTR
AEN
DSW
ITC
H
MA
INN
/C
12
34
ZO
NE
6
PRIO
RITY
ZO
NE
JUM
PER
3 &
4S
EE
NO
TE
TO B
OIL
ER A
QU
AST
AT
RELA
Y
BO
ILE
R
HN
DH
WPU
MP
Not
e: W
hen
a ci
rcul
ator
is u
sed
on t
hep
riorit
y zo
ne in
stea
d of
a z
one
valv
e,ju
mp
er 3
and
4 o
f the
prio
rity
zone
.
AA
QU
AST
AT
ON
DH
W H
EATE
R
BOIL
ER T
URN
S 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.
TT
T
31
ZVC4
04/4
06 w
ith D
omes
tic H
ot W
ater
(DHW
) Pum
p
32
24 V
AC
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5Z
ON
E 6
MO
DE
NO
RMA
LRE
SET FUSE (7 AMP MAX)
TT
TT
TT
TT
TT
TT
ZO
NE
6 PR
IORI
TY
OFF
ON
ZVC
40
6
12
34
12
34
12
34
12
34
12
34
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
JUM
PER
3 &
4
TAC
O3
WIR
E Z
ON
E V
ALV
E
1 2 3
MO
TOR
END
SWIT
CH
THER
MO
STA
TTH
ERM
OST
AT
THER
MO
STA
T
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
, SEL
F C
LOSI
NG
)
T ST
AT
1
VALV
E 1
T ST
AT
2
VALV
E 2
T ST
AT
3VA
LVE
3T
STA
T 4
VALV
E 4
T ST
AT
5VA
LVE
5T
STA
T 6
VALV
E 6
POW
ER
SIX
ZO
NE
ZO
NE
VALV
E C
ON
TRO
LW
ITH
OPT
ION
AL
PRIO
RITY
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN
24
VAC
FACTORYINSTALLED
TRANSFORMER 1
20 V
AC
INPU
T
WH
ITE
BLA
CK
N/O
CO
MZ
ON
E 6
RELA
YEN
DSW
ITC
H
EXTR
AEN
DSW
ITC
H
MA
INN
/C
12
34
ZO
NE
6
PRIO
RITY
ZO
NE
JUM
PER
3 &
4S
EE
NO
TE
TO B
OIL
ER A
QU
AST
AT
RELA
Y
BO
ILE
R
HN
DH
WPU
MP
Not
e: W
hen
a ci
rcul
ator
is u
sed
on t
hep
riorit
y zo
ne in
stea
d of
a z
one
valv
e,ju
mp
er 3
and
4 o
f the
prio
rity
zone
.
AA
QU
AST
AT
ON
DH
W H
EATE
R
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.
SYST
EMPU
MP
TT
T
ZVC4
04/4
06 w
ith S
yste
m a
nd D
HW P
umps
33
24 V
AC
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5Z
ON
E 6
MO
DE
NO
RMA
LRE
SET FUSE (7 AMP MAX)
TT
TT
TT
TT
TT
TT
ZO
NE
6 PR
IORI
TY
OFF
ON
ZVC
40
6
12
34
12
34
12
34
12
34
12
34
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
JUM
PER
3 &
4
TAC
O3
WIR
E Z
ON
E V
ALV
E
1 2 3
MO
TOR
END
SWIT
CH
THER
MO
STA
TTH
ERM
OST
AT
THER
MO
STA
T
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
, SEL
F C
LOSI
NG
)
T ST
AT
1
VALV
E 1
T ST
AT
2
VALV
E 2
T ST
AT
3VA
LVE
3T
STA
T 4
VALV
E 4
T ST
AT
5VA
LVE
5T
STA
T 6
VALV
E 6
POW
ER
SIX
ZO
NE
ZO
NE
VALV
E C
ON
TRO
LW
ITH
OPT
ION
AL
PRIO
RITY
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN
24
VAC
FACTORYINSTALLED
TRANSFORMER 1
20 V
AC
INPU
T
WH
ITE
BLA
CK
N/O
CO
MZ
ON
E 6
RELA
YEN
DSW
ITC
H
EXTR
AEN
DSW
ITC
H
MA
INN
/C
12
34
ZO
NE
6
PRIO
RITY
ZO
NE
JUM
PER
3 &
4S
EE
NO
TE
TO B
OIL
ER A
QU
AST
AT
RELA
Y
BO
ILE
R
HN
DH
WPU
MP
Not
e: W
hen
a ci
rcul
ator
is u
sed
on t
hepr
iorit
y zo
ne in
stea
d of
a z
one
valv
e,ju
mpe
r 3
and
4 of
the
prio
rity
zone
.
AA
QU
AST
AT
ON
DH
W H
EATE
R
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.
SEC
ON
DA
RY P
UM
P C
OM
ES O
N W
HEN
AN
Y Z
ON
E C
ALL
S EX
CEP
T P
RIO
RITY
ZO
NE.
SYST
EMPU
MP
SEC
ON
DA
RYPU
MP
TT
T
ZVC4
04/4
06 w
ith S
yste
m, D
HW a
nd S
econ
dary
Pum
ps
34
2 ZVC404/406 Connected Together with Priority
24 VAC
POWER IN
ZONE 2 ZONE 3 ZONE 4
MODENORMAL RESET
FUSE (3 A
MP M
AX
)
ZONE 1T T T T T T T T
ZONE 4 PRIORITY
OFF
ON
N/O COM N/CZONE 4 RELAY
DRYCONTACTS
1 2 3 4 1 2 3 4ZONE 1 ZONE 2
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
THERMOSTAT THERMOSTAT THERMOSTAT
1 2 3 4ZONE 3
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
T STAT 1
VALVE 1T STAT 2VALVE 2T STAT 3
VALVE 3T STAT 4VALVE 4POWER
ENDSWITCH
EXTRAEND
SWITCH
MAIN
24VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZVC 404FOUR ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
1 2 3 4ZONE 4
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
24 VAC
POWER IN
ZONE 2 ZONE 3 ZONE 4
MODENORMAL RESET
FUSE (3 A
MP M
AX
)
ZONE 1T T T T T T T T
ZONE 4 PRIORITY
OFF
ON
N/O COM N/CZONE 4 RELAY
TO BOILER AQUASTAT RELAY
DRYCONTACTS
1 2 3 4 1 2 3 4ZONE 1 ZONE 2
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
THERMOSTAT THERMOSTAT THERMOSTAT
1 2 3 4ZONE 3
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
T STAT 1
VALVE 1T STAT 2VALVE 2T STAT 3
VALVE 3T STAT 4VALVE 4POWER
ENDSWITCH
EXTRAEND
SWITCH
MAIN
24VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
FOUR ZONE ZONE VALVE CONTROLWITH OPTIONAL PRIORITY
BOILER
H
N
AAQUASTAT ONDHW HEATER
PRIORITYON
PRIORITYON
TO BOILERAQUASTAT RELAY
ZVC 404
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
1 2 3 4ZONE 4
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
T T T
T T T
35
2 EXP Zone Valve Controls Connected Together with System Pump
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZV
C40
6-EX
P
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
�SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
24 VAC
POW
ER IN
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILER AQUASTAT RELAY
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
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
MODENORMALRESET
2 WIREZONE VALVE
(NO END SWITCH)
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIREZONE VALVE
(POWER OPEN, SELF CLOSING)
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZV
C40
6-EX
P
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
WITH OPTIONAL PRIORITY
POW
ER IN 24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
A AQUASTAT ONDHW HEATERTTT
T T T
120 VACINPUT
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
MASTER
SLAVE
SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.
SYSTEMPUMP
36
2 EXP Zone Valve Controls Connected Together with DHW Pump
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZV
C40
6-EX
P
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
�SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
24 VACPO
WER
IN
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILERAQUASTAT RELAY
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
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
MODENORMALRESET
2 WIREZONE VALVE
(NO END SWITCH)
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIREZONE VALVE
(POWER OPEN, SELF CLOSING)
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZV
C40
6-EX
P
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
WITH OPTIONAL PRIORITY
POW
ER IN 24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
A AQUASTAT ONDHW HEATERTTT
T T T
120 VACINPUT
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
MASTER
SLAVE
BOILER TURNS ON WHEN ANY ZONE VALVE OPENS.DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHWPUMP
2 EXP Zone Valve Controls Connected Together with System and DHW Pumps
37
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZV
C40
6-EX
P
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
�SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
24 VAC
POW
ER IN
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILERAQUASTAT RELAY
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
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
MODENORMALRESET
2 WIREZONE VALVE
(NO END SWITCH)
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIREZONE VALVE
(POWER OPEN, SELF CLOSING)
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZV
C40
6-EX
P
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
WITH OPTIONAL PRIORITY
POW
ER IN 24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
A AQUASTAT ONDHW HEATERTTT
T T T
120 VACINPUT
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
MASTER
SLAVE
SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHWPUMP
SYSTEMPUMP
38
2 EXP Zone Valve Controls Connected Together with System, DHW and Secondary Pumps
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZV
C40
6-EX
P
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
�SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
24 VAC
POW
ER IN
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILERAQUASTAT RELAY
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
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
MODENORMALRESET
2 WIREZONE VALVE
(NO END SWITCH)
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIREZONE VALVE
(POWER OPEN, SELF CLOSING)
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZV
C40
6-EX
P
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
WITH OPTIONAL PRIORITY
POW
ER IN 24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
A AQUASTAT ONDHW HEATERTTT
T T T
120 VACINPUT
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
MASTER
SLAVE
SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.SECONDARY PUMP TURNS ON WHEN ANY ZONE CALLS, EXCEPT PRIORITY ZONE.
DHWPUMP
SYSTEMPUMP SECONDARY
PUMP
39
PC70
0 Bo
iler R
eset
Con
trol C
onne
cted
To
EXP
Zone
Val
ve C
ontro
l
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5Z
ON
E 6
FUSE 7 AMP MAX
TT
TT
TT
TT
TT
TT
ZO
NE
6 OFF
ON
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
MO
DE
NO
RMA
LRE
SET
IND
IREC
TW
ATER
HEA
TER
AQ
UA
STA
TO
R TH
ERM
OST
AT
PRIO
RITY
ZO
NE
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
TAC
O3
WIR
E Z
ON
E VA
LVE
1 2 3
JUM
PER
3 &
4
MO
TOR
END
SWIT
CH
THER
MO
STA
TTH
ERM
OST
AT
THER
MO
STA
T
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
, SEL
F C
LOSI
NG
)JUM
PER
3 &
4
12
34
MA
STER
SLA
VEPO
WER
CO
NTR
OLS
PLU
G-I
NC
ARD
S P
RIO
RIT
Y
TACO, INC ZVC406-EXP
T ST
AT
1
T ST
AT
2
T ST
AT
3
T ST
AT
4
T ST
AT
5
T ST
AT
6
POW
ER O
N
VALV
E 1
VALV
E 2
VALV
E 3
VALV
E 4
VALV
E 5
VALV
E 6
�S
EE
NO
TE
EXPA
NSI
ON
ZVC
406
-EX
PSI
X Z
ON
E Z
ON
E VA
LVE
CO
NTR
OL
WIT
H O
PTIO
NA
L PR
IORI
TY
24
VAC
POWER IN
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
TO B
OIL
ERA
QU
AST
AT
RELA
Y
DRY
CO
NTA
CTS
N/O
CO
MZ
ON
E 6
RELA
YN
/CEN
DSW
ITC
HA
PUM
P
END
SWIT
CH
BBO
ILER
ZONE
CONT
ROL
BOIL
SEN
OUT
SEN
BO
ILE
R S
EN
SO
R
OU
TD
OO
RS
EN
SO
R
PC
700
SYST
EMC
IRC
ULA
TOR
H N
BO
ILE
R
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
Not
e: W
hen
a ci
rcul
ator
is u
sed
on t
hepr
iorit
y zo
ne in
stea
d of
a z
one
valv
e,ju
mpe
r 3
and
4 of
the
prio
rity
zone
.
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rRe
set/
Nor
mal
: Res
etPr
iorit
y Z
one:
On
or O
ff
SYST
EM C
IRC
ULA
TOR
AN
D B
OIL
ER T
URN
ON
WH
EN A
NY
ZO
NE
VALV
E O
PEN
S.
TT
T
40
PC70
2 2–
Stag
e Bo
iler R
eset
Con
trol C
onne
cted
To
EXP
Zone
Val
ve C
ontro
l
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5Z
ON
E 6
FUSE 7 AMP MAX
TT
TT
TT
TT
TT
TT
ZO
NE
6 OFF
ON
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
MO
DE
NO
RMA
LRE
SET
IND
IREC
TW
ATER
HEA
TER
AQ
UA
STA
TO
R TH
ERM
OST
AT
PRIO
RITY
ZO
NE
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
TAC
O3
WIR
E Z
ON
E VA
LVE
1 2 3
JUM
PER
3 &
4
MO
TOR
END
SWIT
CH
THER
MO
STA
TTH
ERM
OST
AT
THER
MO
STA
T
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
, SEL
F C
LOSI
NG
)JUM
PER
3 &
4
12
34
MA
STER
SLA
VEPO
WER
CO
NTR
OLS
PLU
G-I
NC
ARD
S P
RIO
RIT
Y
TACO, INC ZVC406-EXPT
STA
T 1
T ST
AT
2
T ST
AT
3
T ST
AT
4
T ST
AT
5
T ST
AT
6
POW
ER O
N
VALV
E 1
VALV
E 2
VALV
E 3
VALV
E 4
VALV
E 5
VALV
E 6
�S
EE
NO
TE
EXPA
NSI
ON
ZVC
406
-EX
PSI
X Z
ON
E Z
ON
E VA
LVE
CO
NTR
OL
WIT
H O
PTIO
NA
L PR
IORI
TY
24
VA
C
POWER IN
24 VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
N/O
CO
MZ
ON
E 6
RELA
YN
/CEN
DSW
ITC
HA
PUM
P
END
SWIT
CH
BBO
ILER
SYST
EMC
IRC
ULA
TOR
H N
BO
ILE
R#2ZO
NECO
NTRO
LBO
ILSE
NOU
TSE
N BO
ILE
R S
EN
SO
R
OU
TD
OO
RS
EN
SO
R
PC
702
STAG
E1
STAG
E2 B
OIL
ER
#1
DH
WD
EM
AN
D
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
Not
e: W
hen
a ci
rcul
ator
is u
sed
on
the
prio
rity
zone
inst
ead
of a
zon
e va
lve,
jum
per
3 a
nd 4
of t
he p
riorit
y zo
ne.
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rRe
set/
Nor
mal
: Nor
mal
Prio
rity
Zon
e: O
n or
Off
WIR
ING
NEE
DED
ON
LY IF
PRIO
RITY
ZO
NE
IS D
HW SY
STEM
CIR
CU
LATO
R A
ND
BO
ILER
TU
RN O
N W
HEN
AN
Y Z
ON
E VA
LVE
OPE
NS.
DH
W C
IRC
ULA
TOR
TURN
S O
N O
NLY
WH
EN P
RIO
RITY
ZO
NE
CA
LLS.
DH
WC
IRC
ULA
TOR
TT
T
41
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
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5Z
ON
E 6
FUSE 7 AMP MAX
TT
TT
TT
TT
TT
TT
ZO
NE
6 OFF
ON
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
MO
DE
NO
RMA
LRE
SET
IND
IREC
TW
ATER
HEA
TER
AQ
UA
STA
TO
R TH
ERM
OST
AT
PRIO
RITY
ZO
NE
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
TAC
O3
WIR
E Z
ON
E VA
LVE
1 2 3
JUM
PER
3 &
4
MO
TOR
END
SWIT
CH
THER
MO
STA
TTH
ERM
OST
AT
THER
MO
STA
T
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
, SEL
F C
LOSI
NG
)JUM
PER
3 &
4
12
34
MA
STER
SLA
VEPO
WER
CO
NTR
OLS
PLU
G-I
NC
ARD
S P
RIO
RIT
Y
TACO, INC ZVC406-EXP
T ST
AT
1
T ST
AT
2
T ST
AT
3
T ST
AT
4
T ST
AT
5
T ST
AT
6
POW
ER O
N
VALV
E 1
VALV
E 2
VALV
E 3
VALV
E 4
VALV
E 5
VALV
E 6
SE
E N
OT
E
EXPA
NSI
ON
ZVC
406
-EX
PSI
X Z
ON
E Z
ON
E VA
LVE
CO
NTR
OL
WIT
H O
PTIO
NA
L PR
IORI
TY
24
VA
C
POWER IN
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
TO B
OIL
ERA
QU
AST
AT
RELA
Y
DRY
CO
NTA
CTS
N/O
CO
MZ
ON
E 6
RELA
YN
/CEN
DSW
ITC
HA
PUM
P
END
SWIT
CH
BBO
ILER
H N
BO
ILE
R
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
ZONE
CONT
ROL
BOIL
SEN
OUT
SEN
BO
ILE
R S
EN
SO
R
OU
TD
OO
RS
EN
SO
R
PC
705-
2
SUP
SEN
SU
PP
LY S
EN
SO
R
INJE
CTI
ON
CIR
CU
LATO
R
SYST
EMC
IRC
ULA
TOR
(SEE
NO
TE B
ON
PA
GE
23)
BLA
CK
BLU
E
RED
GRE
EN/G
ROU
ND
Not
e: W
hen
a ci
rcul
ator
is u
sed
on t
hepr
iorit
y zo
ne in
stea
d of
a z
one
valv
e,ju
mpe
r 3
and
4 of
the
prio
rity
zone
.
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rRe
set/
Nor
mal
: Res
etPr
iorit
y Z
one:
On
or O
ff
SYST
EM C
IRC
ULA
TOR
(OPT
ION
AL
LOC
ATI
ON
)
SYST
EM C
IRC
ULA
TOR
AN
D B
OIL
ER T
URN
ON
WH
EN A
NY
ZO
NE
VALV
E O
PEN
S.
TT
T
42
PC700 Boiler Reset Control Connected To 2 EXP Zone Valve Controls
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
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
�SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILERAQUASTAT RELAY
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
SYSTEMCIRCULATOR
H
N
BOILER
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
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
�SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset Priority Zone: On or Off
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
MASTER
SLAVE
INDIRECT WATER HEATERAQUASTAT OR THERMOSTAT
24 VAC
TTT
24 VAC
TTT
SYSTEM CIRCULATOR AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW CIRCULATOR TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHWCIRCULATOR
43
PC702 2–Stage Boiler Reset Control Connected To 2 EXP Zone Valve Controls
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
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
�SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACKN/O COM
ZONE 6 RELAYN/C
ENDSWITCH
APUMP
ENDSWITCH
BBOILER
SYSTEMCIRCULATOR
H
N
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
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
�SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24
VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
BOILER#2
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#1
DHWDEMAND
24
VAC
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Normal Priority Zone: On or Off
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: NormalPriority Zone: Off
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
MASTER
SLAVE
INDIRECT WATER HEATERAQUASTAT OR THERMOSTAT
24 VAC
TTT
24 VAC
TTT
SYSTEM CIRCULATOR AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW CIRCULATOR TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHWCIRCULATOR
44
PC705 Variable Speed Pump Injection Control Connected To 2 EXP Zone Valve Controls
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
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
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ERWHITE
BLACK
TO BOILERAQUASTAT RELAY
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
H
N
BOILER
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
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
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ERWHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGSMaster/Slave: Master Reset/Normal: ResetPriority Zone: On or Off
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: Off
SYSTEM CIRCULATOR(OPTIONAL LOCATION)
MASTER
SLAVE
INDIRECT WATER HEATERAQUASTAT OR THERMOSTAT
24 VAC
TTT
24 VAC
TTT
(SEE NOTE B ON PAGE 23)
45
PC700 and PC705 Connected To 2 EXP Zone Valve Controls
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
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
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILERAQUASTAT RELAY
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
SYSTEMCIRCULATOR
H
N
BOILER
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
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
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset Priority Zone: On or Off
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
MASTER
SLAVE
INDIRECT WATER HEATERAQUASTAT OR THERMOSTAT
24 VAC
TTT
24 VAC
TTT
SYSTEM CIRCULATOR AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW CIRCULATOR TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHWCIRCULATOR
(SEE NOTE B ON PAGE 23)
46
PC702 and PC705 Connected To 2 EXP Zone Valve Controls
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZV
C40
6-EX
P
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
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACKN/O COM
ZONE 6 RELAYN/C
ENDSWITCH
APUMP
ENDSWITCH
BBOILER
SYSTEMCIRCULATOR
H
N
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
BOILER#2
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#1
DHWDEMAND
24
VAC
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
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZV
C40
6-EX
P
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
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Normal Priority Zone: On or Off
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
MASTER
SLAVE
INDIRECT WATER HEATERAQUASTAT OR THERMOSTAT
24 VAC
TTT
24 VAC
TTT
SYSTEM CIRCULATOR AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW CIRCULATOR TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHWCIRCULATOR
(SEE NOTE B ON PAGE 23)
47
HAFC101 with 1 Speed Air Handler
HAFC 101 WITH 1 SPEED AIR HANDLER(Both HFC 101 and HAFC 201 are
capable of 1 and 2 speed applications.)
THERMOSTAT
Optional Power Wireto Thermostatthat Requires 24VAC
To: Aquastat onReturn Line ofHydro Coil
Dry Contacts To:“T T” on Boileror Switching Relay
Power OnCall for HeatFan, CoolingFan, Heating
OutdoorCondenserUnit
T T
BOILER AIR HANDLER
G GX X C R Y
C R GY TWTHERMOSTAT AQUASTAT
HAFC101HYDRO AIR FAN CONTROL
Jumper
M
FanRelay
Line
24 V
AC
LOW HIGH
T
48
HAFC101 with 2 Speed Air Handler
HAFC 101 WITH 2 SPEED AIR HANDLER(Both HFC 101 and HAFC 201 are
capable of 1 and 2 speed applications.)
THERMOSTAT
Optional Power Wireto Thermostatthat Requires 24VAC
To: Aquastat onReturn Line ofHydro Coil
Dry Contacts To:“T T” on Boileror Switching Relay
Power OnCall for HeatFan, CoolingFan, Heating
OutdoorCondenserUnit
T T
BOILER AIR HANDLER
G GX X C R Y
C R GY TWTHERMOSTAT AQUASTAT
HAFC101HYDRO AIR FAN CONTROL
M
Low
Hig
h
Line
24 V
AC
Fan
Rela
ys
LOW HIGH
T
49
HAFC201 with 1 Speed Air Handler
M
FanRelay
Line
24 V
AC
THERMOSTAT
Optional Power Wireto Thermostatthat Requires 24VAC
To: OptionalAquastat onReturn Line ofHydro Coil
Power OnCall for HeatFan, CoolingFan, Heating
OutdoorCondenserUnit
T T
BOILER AIR HANDLER
G GX X C R Y
C R GYWTHERMOSTAT AQUASTATS
HAFC201HYDRO AIR FAN CONTROL
TTWATER COIL FREEZE PR
To: Optional Aquastator Thermostat to senselow ambienttemperature
Hot
Neutral
Circulator
XXPUMP
5 AMP 1/6 HP RATEDDRY CONTACTS
1 MIN
ON
DELA
Y - FAN
3 MIN
ON
DELA
Y - FAN
2 MIN
@ 24 H
R - PUM
P30 SEC
@ 2 W
K - PUM
P
OFF O
NJumper
(or to “T T” onswitching relay)
HAFC 201 WITH 1 SPEED AIR HANDLER(Both HFC 101 and HAFC 201 are
capable of 1 and 2 speed applications.)
Dry Contacts To:“T T” on Boileror SwitchingRelay
LOW HIGH
T
NOTE: For 4 minuteon delay of Heating Fan,switch 1 and 3 MIN ONDELAY to ON position.
50
HAFC201 with 2 Speed Air Handler
THERMOSTAT
Optional Power Wireto Thermostatthat Requires 24VAC
To: OptionalAquastat onReturn Line ofHydro Coil
Power OnCall for HeatFan, CoolingFan, Heating
OutdoorCondenserUnit
T T
BOILER AIR HANDLER
G GX X C R Y
C R GYWTHERMOSTAT AQUASTATS
HAFC201HYDRO AIR FAN CONTROL
TTWATER COIL FREEZE PR
To: Optional Aquastator Thermostat to senselow ambienttemperature
Hot
Neutral
Circulator
XXPUMP
5 AMP 1/6 HP RATEDDRY CONTACTS
1 MIN
ON
DELA
Y - FAN
3 MIN
ON
DELA
Y - FAN
2 MIN
@ 24 H
R - PUM
P30 SEC
@ 2 W
K - PUM
P
OFF O
N
(or to “T T” onswitching relay)
HAFC 201 WITH 2 SPEED AIR HANDLER(Both HFC 101 and HAFC 201 are
capable of 1 and 2 speed applications.)
“T T” on Boileror SwitchingRelay M
Low
Hig
h
Line
24 V
AC
Fan
Rela
ysLOW HIGH
T
NOTE: For 4 minuteon delay of Heating Fan,switch 1 and 3 MIN ONDELAY to ON position.
51
Mul
tiple
HAF
C’s
and
Switc
hing
Rel
ay
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
Y W
ITH
OPT
ION
AL
PRIO
RITY
ZO
NE
4 ON
OFF
PRIO
RITY
120V
REL
AY
FUSE
1 A
MP
24 V
AC
POW
ER
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
120
VAC
INPU
T
TO:
"TT"
ON
BO
ILER
120
VOLT
CIR
CU
LATO
RSZ
C
ZR
X
XEN
DSW
ITC
H
ZO
NE1
Z
ON
E2
ZO
NE3
Z
ON
E4PO
WER
INPU
T
ZO
NE
2
POW
ERZ
ON
E 1
ZO
NE
3Z
ON
E 4
JUM
PER
BO
ILE
R
H N
SR 5
04
DH
WH
EATE
RA
QU
AST
AT
THER
MO
STA
T
POW
ER P
MC
ALL
FO
R H
EAT
FAN
, CO
OLI
NG
FAN
, HEA
TIN
G
OU
TDO
OR
CO
ND
ENSE
RU
NIT
TT
BOIL
ERA
IR H
AN
DLE
R
GG
XX
CR
Y
CR
GY
TW
THER
MO
STA
TAQ
UAS
TAT
HA
FC10
1H
YDRO
AIR
FA
N C
ON
TRO
L
M
Low
High
Line24 VAC
FanRelays
LOW
HIG
H
THER
MO
STAT
TT
BOIL
ERA
IR H
AN
DLE
R
GG
XX
CR
Y
CR
GY
TW
THER
MO
STA
TAQ
UAS
TAT
HA
FC10
1H
YDRO
AIR
FA
N C
ON
TRO
L
M
Low
High
Line24 VAC
FanRelays
LOW
HIG
H
2 SP
EED
AIR
HA
ND
LER
THER
MO
STAT
TT
BOIL
ERA
IR H
AN
DLE
R
GG
XX
CR
Y
CR
GY
TW
THER
MO
STA
TAQ
UAS
TAT
HA
FC10
1H
YDRO
AIR
FA
N C
ON
TRO
L
M
Low
High
Line24 VAC
FanRelays
LOW
HIG
H
OPT
ION
AL
POW
ER W
IRE
TO T
HER
MO
STA
TTH
AT
REQ
UIR
ES 2
4VA
C
OPT
ION
AL
POW
ER W
IRE
TO T
HER
MO
STA
TTH
AT
REQ
UIR
ES 2
4VA
C
OPT
ION
AL
POW
ER W
IRE
TO T
HER
MO
STA
TTH
AT
REQ
UIR
ES 2
4VA
C
TO: A
QU
AST
AT
ON
RETU
RN L
INE
OF
HYD
RO C
OIL
TO: A
QU
AST
AT
ON
RETU
RN L
INE
OF
HYD
RO C
OIL
TO: A
QU
AST
AT
ON
RETU
RN L
INE
OF
HYD
RO C
OIL
OU
TDO
OR
CO
ND
ENSE
RU
NIT
OU
TDO
OR
CO
ND
ENSE
RU
NIT
2 SP
EED
AIR
HA
ND
LER
2 SP
EED
AIR
HA
ND
LER
POW
ER P
MC
ALL
FO
R H
EAT
FAN
, CO
OLI
NG
FAN
, HEA
TIN
G
POW
ER P
MC
ALL
FO
R H
EAT
FAN
, CO
OLI
NG
FAN
, HEA
TIN
G
TT
T
52
3 Wire Thermostat Connected to TACO Switching Relay
BOILER
H
N
TT
T
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VACPOWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
T
W R
COM
3 WIRETHERMOSTAT
3 Wire Thermostat Connected to TACO Zone Valve Control
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5T T T T T T T T T T
ZVC 405
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
3 WIRE ZONE VALVE(TACO TYPE)
123
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(HONEYWELL TYPE)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5POWER
FIVE ZONE ZONE VALVE CONTROL
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ENDSWITCH
TT
TO T&T ON BOILEROR PUMP RELAY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
BLA
CK
RED
BLA
CK
RED
WH
RED
CO
MM
ON
W RC
T T T
53
Whi
te-R
oger
s 13
61 H
ydro
nic
Zone
Val
ve w
ith T
ACO
Zone
Val
ve C
ontro
l
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5T
TT
TT
TT
TT
T
ZVC
40
5
12
34
12
34
12
34
12
34
12
34
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5
WH
ITE-
ROG
ERS
1361
HYD
RON
IC Z
ON
E VA
LVE
3
3 W
IRE
ZO
NE
VALV
E(T
AC
O T
YPE)
1 2 3
MO
TOR
END
SWIT
CH
THER
MO
STA
TTH
ERM
OST
AT
THER
MO
STA
T
4 W
IRE
ZO
NE
VALV
E(H
ON
EYW
ELL
TYPE
)
T ST
AT
1
VALV
E 1
T ST
AT
2
VALV
E 2
T ST
AT
3VA
LVE
3T
STA
T 4
VALV
E 4
T ST
AT
5VA
LVE
5PO
WER
FIVE
ZO
NE
ZO
NE
VALV
E C
ON
TRO
L
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
END
SWIT
CH
T TTO
T&
T O
N B
OIL
ERO
R PU
MP
RELA
Y
POWER IN
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
BLACK
RED
BLACK
RED
RIG
HT
TTSC
REW
(SEE
NO
TE)
41
2
NO
TE: W
HEN
USI
NG
ZVC
404
OR
ZVC
406
,C
ON
NEC
T W
IRE
#2 O
F Z
ON
E VA
LVE
TO P
RIO
RITY
ZO
NE
RIG
HT
TT S
CRE
W
TT
T
3
TE
RM
INA
L A
SS
IGN
ME
NT
ZO
NE
VA
LVE
CO
NT
RO
L1
12 3
TT (R
t)
42
54
Hone
ywel
l VC
40 &
80
(spd
t) Hy
dron
ic Z
one
Valve
with
TAC
O Zo
ne V
alve
Con
trol
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5T
TT
TT
TT
TT
T
ZVC
40
5
12
34
12
34
12
34
12
34
12
34
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5
HO
NEY
WEL
L VC
(SP
ST)
HYD
RON
IC Z
ON
E VA
LVE
SERI
ES 4
0 &
801
3 W
IRE
ZO
NE
VALV
E(T
AC
O T
YPE)
1 2 3
MO
TOR
END
SWIT
CH
THER
MO
STA
TTH
ERM
OST
AT
THER
MO
STA
T
4 W
IRE
ZO
NE
VALV
E(H
ON
EYW
ELL
TYPE
)
T ST
AT
1
VALV
E 1
T ST
AT
2
VALV
E 2
T ST
AT
3VA
LVE
3T
STA
T 4
VALV
E 4
T ST
AT
5VA
LVE
5PO
WER
FIVE
ZO
NE
ZO
NE
VALV
E C
ON
TRO
L
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
END
SWIT
CH
T TTO
T&
T O
N B
OIL
ERO
R PU
MP
RELA
Y
POWER IN
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
BLACK
RED
BLACK
RED
RIG
HT
TTSC
REW
(SEE
NO
TE)
46
23
NO
TE: W
HEN
USI
NG
ZVC
404
OR
ZVC
406
,C
ON
NEC
T W
IRE
#3 O
F Z
ON
E VA
LVE
TO P
RIO
RITY
ZO
NE
RIG
HT
TT S
CRE
W
TT
T
TE
RM
INA
L A
SS
IGN
ME
NT
ZO
NE
VA
LVE
CO
NT
RO
LO
RA
NG
E1
3B
LUE
2B
RO
WN
31
GR
AY4
4B
LAC
K6
2
TT (R
t)
570 Zone Valve to Switching Relay
SR 503 ZONE1 ZONE2 ZONE3
24 VACPOWER
FUSE 1 AMP
120 VOLTCIRCULATORS
ZONE1 ZONE2 ZONE3JUMPERS
N P ZC H X ZR1
X2
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
ZONE 2
POWERZONE 1
ZONE 3
TO: 120 VAC POWER (NEUTRAL)
TO: 120 VAC POWER (HOT)
TO: "TT" ON AQUASTAT CONTROL
TO: "TT" ON AQUASTAT CONTROL
T
1
2
3
24 VACTRANSFORMER
THERMOSTAT
55
56
Zone
Val
ve C
ontro
l with
1 L
ow T
empe
ratu
re Z
one
Usin
g Pr
iorit
y Zo
ning
Circ
ulat
or
24 V
AC
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5Z
ON
E 6
MO
DE
NO
RMA
LRE
SET FUSE (7 AMP MAX)
TT
TT
TT
TT
TT
TT
ZO
NE
6 PR
IORI
TY
OFF
ON
ZVC
40
6
12
34
12
34
12
34
12
34
12
34
ZO
NE
1Z
ON
E 2
ZO
NE
3Z
ON
E 4
ZO
NE
5
JUM
PER
3 &
4
TAC
O3
WIR
E Z
ON
E VA
LVE
1 2 3
END
SWIT
CH
THER
MO
STA
TTH
ERM
OST
AT
THER
MO
STA
T
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
,SE
LF C
LOSI
NG
)
T ST
AT
1
VALV
E 1
T ST
AT
2
VALV
E 2
T ST
AT
3VA
LVE
3T
STA
T 4
VALV
E 4
T ST
AT
5VA
LVE
5T
STA
T 6
VALV
E 6
POW
ER
SIX
ZO
NE
ZO
NE
VALV
E C
ON
TRO
LW
ITH
OPT
ION
AL
PRIO
RITY
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
N/O
CO
MZ
ON
E 6
RELA
Y
DRY
CO
NTA
CTS
END
SWIT
CH
EXTR
AEN
DSW
ITC
H
MA
INN
/C
TO B
OIL
ER A
QU
AST
AT
RELA
Y
BO
ILE
R
HN
SYST
EMPU
MP
AA
QU
AST
AT
ON
DH
W H
EATE
R
SYST
EM P
UM
P A
ND
BO
ILER
TU
RN O
NW
HEN
AN
Y Z
ON
E VA
LVE
OPE
NS.
12
34
ZO
NE
6
PRIO
RITY
ZO
NE
JUM
PER
3 &
4S
EE
NO
TE
Not
e: W
hen
a ci
rcul
ator
isus
ed o
n th
e pr
iorit
y zo
nein
stea
d of
a z
one
valv
e,ju
mpe
r 3
and
4 of
the
prio
rity
zone
.
TT
T
MO
TOR
MO
TOR
END
SWIT
CH
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
,SE
LF C
LOSI
NG
)
ON
OFF
PRIO
RITY
POW
ER IN
120
VAC
INPU
T
TH
ERM
OST
AT
BO
ILER
PR
IORI
TY
PRIO
RITY
ZO
NIN
G C
IRC
ULA
TOR
PR-IN
PR-O
UT
LIVE
NEU
T1
23
4
PRIO
RITY
ON
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
Off-Enable On-ControlBoiler Operation
Pump
High Mass Boiler
T
Radiant Mixing Block, Single Zone
Radiant Mixing Block (RMB)
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard57
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
THREE ZONE ZONE VALVE CONTROL
ZVC 403
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3E ND
SWITCH
ZONE 1T T
ZONE 2T T
ZONE 3T T
FUSE(5 AMP MAX)
N/O N/CCOM
POW
ER IN
Off-Enable On-ControlBoiler Operation
Fact
ory
Inst
alle
dTr
ansf
orm
er
Pump
Outdoor
Sensor
ThermostatsT T
H
N
Moto
r
End S
witch
Moto
r
End S
witch
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
SR503-EXP
FUSE 1 AMP
24 VACPOWER
ON
OFF
ZONE 3PRIORITY
RESET NORMAL
POWER CONTROLINTERFACE
MASTER
SLAVE
1 2 3 4EXPANSION
PLUG-IN CARDS
ZONE3ZONE2ZONE1
INPUT120 VOLT CIRCULATORSPOWERZONE3ZONE2ZONE1ZRZCEND
SWITCH
X X
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
SR503-EXP
FUSE 1 AMP
24 VACPOWER
ON
OFF
ZONE 3PRIORITY
RESET NORMAL
POWER CONTROLINTERFACE
MASTER
SLAVE
1 2 3 4EXPANSION
PLUG-IN CARDS
ZONE3ZONE2ZONE1
INPUT120 VOLT CIRCULATORSPOWERZONE3ZONE2ZONE1ZRZCEND
SWITCH
X X
Boiler Sensor
SupplySensor
OutdoorSensor
H
N
ComSup Boil Out HeatDem
Com Com
Boiler
SysRet
RMBBack of Control
Off-Enable On-ControlBoiler Operation
Power CordA
Pump
N
Thermostats
T
T
Thermostats
T
T
H
N
Power
Input
DHW
DHWCirc.
Aquastat
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard58
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
Boiler
HN
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)
Off-Enable On-ControlBoiler Operation
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
ComSup Boil Out HeatDem
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)
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard59
60
FOUR ZONE ZONE VALVE CONTROLWITH OPTIONAL PRIORITY
OFFON
ZONE 4 PRIORITYMODERESET
ZVC 404
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
ZONE 4 RELAYN/O N/CCOMEXTRA
ENDSWITCH
MAINEND
SWITCH
ZONE 1T T
ZONE 2T T
ZONE 3T T
ZONE 4T T
NORMAL
FUSE(3 AMP MAX)
POWER IN
H
N
ComSup Boil Out HeatDem
Com ComSysRet
Power
Input
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
Off-Enable On-ControlBoiler Operation
Pump
Outdoor
Sensor
Boiler
H N
FactoryInstalled
Transformer
HEAT
SOURCE
TT
T
Input fromHeat Source
H
N
ComSup Boil Out HeatDem
Com ComSysRet
Power
Input
N P ZC H X1 ZRX2
FUSE 1 AMP
24 VACPOWER
TWO ZONE SWITCHING RELAY
SR 502 ZONE1 ZONE2
ZONE1 ZONE2
N P ZC H X1 ZRX2
FUSE 1 AMP
24 VACPOWER
TWO ZONE SWITCHING RELAY
SR 502 ZONE1 ZONE2
ZONE1 ZONE2
Power
Cord
Power
Input
Input fromHeat Source
Output to System
SupplySensor
ReturnSensor
ExpTank
PressureRelief
X - Pump Block Connected to 2 SR502/503 Switching Relays
XPBBack of Control
Off-Enable On-ControlBoiler Operation
Pump
Outdoor
Sensor
Boiler
H
N
H
N
T
TT
T
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)
61
62
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
ThermostatT
H 3 54N/O4
N/C6
N/ON N/C6
SR5011 ZONE
SWITCHING RELAY
120 VACINPUT
TT COM
WR 24VAC
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
iValve-S
or
Back ofControl
EndSwitch
SENSOR COMMON
C R
24 VACPOWER INPUT
BOILERPOWERGREEN
SENSORERROR
RED
SUPPLY
SETBACK
24 V (ac)Transformer
orSetback
Input
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard
63
iSe
ries-R
BC
A
BC
ASupply
Sensor
N P ZC H X1 ZRX2
ZONE1 ZONE2 ZONE3
ZONE1 ZONE2 ZONE3
FUSE 1 AMP
24 VACPOWER
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
SR 503
24 V
olt
Tra
nsfo
rmer
H N
Power
Input
C R
24 VACPOWER INPUT
SENSOR COMMON
BOILER SUPPLY OUTDOOR
POWERGREEN
SENSORERROR
RED
BACK OF iVALVE-R MIXING VALVE ACTUATOROutdoor
Sensor
DHWCirc.
ADHW Aquastat
Thermostats
T
T
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
BOILER SUPPLY OUTDOOR
POWERGREEN
SENSORERROR
RED
BACK OF iVALVE-R MIXING VALVE ACTUATOR
MM
H
N
THREE ZONE ZONE VALVE CONTROL
ZVC 403
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3E ND
SWITCH
ZONE 1T T
ZONE 2T T
ZONE 3T T
FUSE(5 AMP MAX)
N/O N/CCOM
iValve, 4-Way Mixing Working with Zone Valve Control
iSeries-R
Fact
ory
Inst
alle
dTr
ansf
orm
er
POW
ER IN
ThermostatsT
T
Mo
tor
En
d S
witch
Mo
tor
En
dS
witch
PowerInput
OutdoorSensor
BoilerSensor
SupplySensor
Boiler
Sensor
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard
64
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
65
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.
Wiring Taco LN and LTA-2 Series Low Water CutoffsUsing Burner Circuit Power Source
*
*Factory Installed
66
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.
67
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.
68
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.
69
Taco Low Water Cutoff Replacement Guide
Bold / Italics Indicates Discontinued Part Number
Taco McDonnell & Miller Hydrolevel Honeywell
LFA1203S-1LTA1203N-1LTA1203S-1
PS-801-120PSE-801-120PS-800-120PS-850-120900900C
450CG450CGT450OEM170TD
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-802-24PSE-802-24 PS-800-24PS-850-24
400CG400OEM24TD
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
LFA1202R-1LTA1202R-1
PS-851-RX2-120 650R
LFM1202R-1LTM1202R-1
PS-851-M-RX2-120 550R
LFA0242R-1LTA0242R-1
PS-802-RX2-24 400R
LTA0243S-2LNA0243S-1
PS-852-24PS-852-SP-24750-MT-SP-24750P-MT-24750P-MT-U-24
2424SV600600SVOEM24C
LTA1203S-2LNA1203S-1
RB-120RB-122EPS-851-120PS-851-SP-120750P-MT-120750P-MT-SP-120750P-MT-U-120901RB-120IIRB-122
170170SV1150650650SVOEM170COEM170
RW700A1007RW700A1006
LTR0243T-1RB-24ERB-24
1100
P3R-1RS-1-BR-1RS-1-LPRS-1-LP-S
EL1214-R
EWF120
WFE-120WF2-U-120VWF-2-120WF-4-120
VRTX-120V-120-1&2 VW400A1004
EWF024
WFE-24WF2-U-24VWF-2-24WF-4-24
VRTX-24V-24-1&2 VW800A1004
70
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
McDONNELL & MILLERPS-801/851-120
w/Red & Green LEDs
FACTORYINSTALLED
JUMPER
120 VAC Models with 24 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
HYDROLEVEL450, 550, 650 & 750
2 1 P1 P2 A
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
N H C W B
McDONNELL & MILLERPS-801/851-120
w/Red & Green LEDs
24 VACTRANSFORMER
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
71
Taco LF Series 24 Volt LWCO Competitive Wiring Cross Reference
24 VAC Models with 24 VAC Burner Circuits
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
McDONNELL & MILLERPS-802/852-24
FACTORYINSTALLED
JUMPER
24 VAC Models with 120 VAC Burner Circuits
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
McDONNELL & MILLERPS-802/852-24
24 VACTRANSFORMER
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
72
Taco LTA-2 Series 120 Volt LWCO Competitive Wiring Cross Reference
120 VAC Models with 120 VAC Burner Circuits
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
120 VAC Models with 24 VAC Burner Circuits
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
73
Taco LTR and LTA-2 Series 24 Volt LWCO Competitive Wiring Cross Reference
24 VAC Models with 24 VAC Burner Circuits
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
24 VAC Models with 120 VAC Burner Circuits
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
74
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
75
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
76
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
WF-2 switch to position 3- 100 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 H COM NC NOAC POWER OUTPUT CONTACTS
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
WF-2 switch to position 2- 90 sec. delay, 90 sec. feed
WF-2 switch to position 3- 100 sec. delay, 90 sec. feed
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.
Do not connect feeder to a manual reset LWCO.
120 VAC LWCO Using Burner Circuit Power Source
77
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
N H COM NC NOAC POWER OUTPUT CONTACTS
BURNER
Set Safgard as desired.
WHITE BLACK
Remove jumper between H and COM if usingpower source other than burner circuitor when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
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
N H COM NC NOAC POWER OUTPUT CONTACTS
BURNER
Set Safgard as desired.
WHITE BLACK
24 VAC LWCO Using Burner Circuit Power Source
Remove jumper between H and COM if usingpower source other than burner circuitor when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
120 VAC LWCO Using Burner Circuit Power Source
78
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
N H COM NC NOAC POWER OUTPUT CONTACTS
BURNER
Set Safgard as desired.
WHITE REDBLACK
Remove jumper between H and COM if usingpower source other than burner circuitor when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
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
N H COM NC NOAC POWER OUTPUT CONTACTS
BURNER
Set Safgard as desired.
WHITE REDBLACK
24 VAC LWCO Using Burner Circuit Power Source
Remove jumper between H and COM if usingpower source other than burner circuitor when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
120 VAC LWCO Using Burner Circuit Power Source
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
79
80
Aquastat Wiring
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
LINE VOLTAGEOIL BURNER RELAY
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
81
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
LINE VOLTAGEOIL BURNER RELAY
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)
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
C1 B2B1
TACOZONE
CONTROL
HONEYWELL L8148A OR EQUAL
120 VACINPUT
C2
END SWITCH
3
82
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
LOW VOLTAGEGAS VALVE
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
LOW VOLTAGEGAS VALVE
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)
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
B2 C2 B1ZR
TACOSWITCHING
RELAY
HONEYWELL L8124A & C OR EQUAL
120 VACINPUT
C1 ZC
ZC ZR N HTTHERMOSTAT
(IF INDEPENDENT ZONE)
X XEND SWITCH
83
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) TACO
SWITCHINGRELAY
ZC ZR N HX XEND SWITCH
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
B2 C2 B1ZR
HONEYWELL L8124M OR EQUAL
120 VACINPUT
C1 ZC
TTHERMOSTAT
(IF INDEPENDENT ZONE)
TACOSWITCHING
RELAY
ZC ZR N HX XEND SWITCH
84
Aquastat Wiring
LINE VOLTAGEOIL BURNER RELAY
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
TTHERMOSTAT
(IF INDEPENDENT ZONE)
R
W
BB
RL6006LOWLIMIT
CONTROLERB2
TACOSWITCHING
RELAY
ZC ZR N HX 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 HX XEND SWITCH
85
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.
Aquastat Wiring to 24VAC Low Water Cutoff
TV W T
L1(HOT)
L2(NEUTRAL)
CIRCULATORON BOILER
(IF ATTACHED)
L1
C2
L2
120 VACINPUT
C1
LOW VOLTAGEGAS VALVE
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
LOW VOLTAGEGAS VALVE
B1 B2
HONEYWELLL8148E
TACO LNA120 OR LTA120-2
N H COM NC NO
SPILLSWITCH
B
R
Z
G
TOTHERMOSTAT
86
87
AT
TO: 120 VAC POWERCIRCULATOR
JUMPER
120 VACINPUT
THERMOST
R WT T COM
24VAC
N/O N/C N/C N/ON H 3 4 4 6 6 5
TO: TT ON BOILER
SR5011 ZONE SWITCHING RELAY
POWER
T STAT
TACO SR501 REPLACEMNENT CROSS-REFERENCE
MANUFACTURER MODEL CONNECTIONS
Taco SR501 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 L2 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
TypicalWiring
AlternativeWiring
AT
TO: 120 VAC POWERCIRCULATOR
120 VACINPUT
THERMOST
R WT T COM
24VAC
N/O N/C N/C N/ON H 3 4 4 6 6 5
TO: ZC
SR5011 ZONE SWITCHING RELAY
POWER
T STAT
TO: ZR
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
Specifications:PRODUCT NUMBER TRANSFORMER MAXIMUM DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR501 1 Zone 120 VAC Input 7.2 amps 4 1/4" 5 1/4" 2 3/4"
All Switching Relays are relay type DPDT, have a thermostat current of .18, and have a singlephase motor rating per zone of 1/3 hp (7.2A) @ 120 VAC.
Instruction SheetSR501 Switching Relay
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., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2005
TACO, Inc.
Features:External Indicator LightsUniversal ReplaceabilitySnap-in PC BoardSimplified WiringFully Enclosed Snap-Out Relays100% Factory TestedContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL ApprovedExtended 3 Year WarrantyMade in the USA
Operation:Connect a thermostat to the “T T” terminals onthe switching relay. When the thermostat calls forheat, the relay is energized and power is given to thecirculator.
Power Input:Connect 120 volt ac power to terminals N and 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 features of theTaco Zone Controls to achieve total system integra-tion. No matter the application, Taco now providesthe products to maximize system performance whilesimplifying both installation and service.
Warning: Wiring connections must be made in accordance with all applicable elec-trical codes and these instructions. Use copper wire only. Failure to follow thisinstruction can result in personal injury or death and/or property damage. 10-18gauge wire recommended for 120 VAC connections with 9 in.lbs. max torque, 12-22gauge wire for thermostat connections with 9 in.lbs. max torque, and 12-22 gaugewire for 24 VAC source with 5 in.lbs. max torque.
Note: When using Alternative Wiring diagram, the boiler operating con-trol’s ZC terminal will see the load of the circulator(s). Warning: When using Alternative Wiring diagram, wiring instructionsmust be followed so power originates from the boiler aquastat. Failure tofollow these wiring instructions may result in a secondary source of powerbeing connected to the boiler that may activate it under certain circum-stances, causing injury or death.
88
TACO SR501-845RP REPLACEMENT CROSS-REFERENCE
MANUFACTURER MODEL CONNECTIONS
Taco SR501-845RP L1 L2 3 4 5 6 R/T W/T
Argo AR821 1 2 3 4 5 6 T
AR822 L1 L2 3 4 NO 5 6 NO R/T G/T
Colombus MR10 L1 L2 3 4 NO 5 6 NO R/T G/T
Erie SR100 L1 L2 3 4 NO 5 6 NO R/T G/T
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:Universal ReplaceabilityIndicator LightsSnap-in PC Board to Existing EnclosureSimplified WiringFully Enclosed Snap-Out Relay100% Factory TestedUniversal Thermostat CompatibilityUL ApprovedExtended 3 Year WarrantyMade in the USA
Operation:Connect a thermostat to the “T T” terminals onthe switching relay. When the thermostat calls forheat, the relay is energized and power is given tothe circulator.
Power Input:Connect 120 volt ac power to terminals L1 and L2.
Jumper Placement:The jumper is factory installed between terminalsL1 and 3 to switch power on terminal 4.
Diagnostics:The Indicator lights show full functionality of theswitching relay. The green light should always beon, indicating that power is connected. When thethermostat calls for heat, both the appropriate cir-culator and 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.
TypicalWiring
AlternativeWiring
TO: ZR
TO: ZC
THERMOSTAT
TO: 120 VAC POWER
INPUT
R WT T
L2 L1 3 4 5 6
120 VAC
POWER
T STATUNIVERSAL REPLACEMENT RELAY MODEL: SR501-845RP
REPL
AC
ES H
ON
EYW
ELL
R845
, RA
89A
& R
A83
2O
R C
OM
PARA
BLE
RELA
Y
CIRCULATOR
THERMOSTAT
TO: 120 VAC POWER
CIRCULATOR
TO: TT ON BOILER
JUMPER
R WT T
L2 L1 3 4 5 6
120 VACINPUT
POWER
T STATUNIVERSAL REPLACEMENT RELAY MODEL: SR501-845RP
REPL
AC
ES H
ON
EYW
ELL
R845
, RA
89A
& R
A83
2O
R C
OM
PARA
BLE
RELA
Y
Terminal Description:T & T Thermostat ConnectionL2 Neutral wire of power inputL1 Hot wire of power input3 Common terminal for 44 Normally open terminal6 Normally open terminal5 Common terminal for 6
Specifications:PRODUCT NUMBER TRANSFORMER MAXIMUM DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR501-845RP 1 Zone 120 VAC Input 7.2 amps 4 1/4" 5 1/4" 2 3/4"
All Switching Relays are relay type DPDT, have a thermostat current of .18, and have a single phase motor rating per zone of 1/3 hp (7.2A) @ 120 VAC.
Instruction SheetSR501-845RP Universal Replacement Relay
Warning: Wiring connections must be made in accordance with all applicable elec-trical codes and these instructions. Use copper wire only. Failure to follow thisinstruction can result in personal injury or death and/or property damage. 10-18gauge wire recommended for 120 VAC connections with 9 in.lbs. max torque, 12-22gauge wire for thermostat connections with 9 in.lbs. max torque, and 12-22 gaugewire for 24 VAC source with 5 in.lbs. max torque.
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., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2005
TACO, Inc.
Note: When using Alternative Wiring diagram, the boiler operating control’sZC terminal will see the load of the circulator(s). Warning: When using Alternative Wiring diagram, wiring instructions mustbe followed so power originates from the boiler aquastat. Failure to followthese wiring instructions may result in a secondary source of power beingconnected to the boiler that may activate it under certain circumstances,causing injury or death.
89
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., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2005
TACO, Inc.
SR 503
24 VACPOWER
FUSE 1 AMP
THERMOSTATS
ZONE1 ZONE2 ZONE3
120 VOLTCIRCULATORS
ZONE1 ZONE2 ZONE3
TO: "TT" ON AQUASTAT CONTROL
TO: "TT" ON AQUASTAT CONTROL
TO: 120 VAC POWER (HOT)
TO: 120 VAC POWER (NEUTRAL)
JUMPERSN P ZC H X ZR1
X2
ZONE 2
POWERZONE 1
ZONE 3
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
SR 503
24 VACPOWER
FUSE 1 AMP
THERMOSTATS
ZONE1 ZONE2 ZONE3
120 VOLTCIRCULATORS
TO: 120 VAC POWER (HOT)
TO: 120 VAC POWER (NEUTRAL)
TO: "ZC" ON AQUASTAT CONTROL
TO: "ZR" ON AQUASTAT CONTROL
ZONE1 ZONE2 ZONE3JUMPERS
N P ZC H X ZR1
X2
ZONE 2
POWERZONE 1
ZONE 3
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
Cold Start Boiler Application
Tankless Coil Boiler Application
Specifications:PRODUCT NUMBER TRANSFORMER MAXIMUM DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR502 2 with Priority 120 VAC Input 15 amps 10 1/4" 6 3/4" 2 3/4"SR503 3 with Priority 120 VAC Input 15 amps 10 1/4" 6 3/4" 2 3/4"
All Switching Relays are relay type DPST, have a thermostat current of .18, and have a single phase motor rating per zone of 1/3 hp (7.2A) @ 120 VAC.
Features: External Indicator LightsPrioritySimplified WiringFully Enclosed Snap-Out RelaysCompact DesignFuse Protected100% Factory TestedIsolated End SwitchContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL Approved24 volt Power Input or Output TerminalExtended 3 Year WarrantyMade in the USA
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 connect-ed. When the thermostat calls for heat, both the appropriate circulatorand red indicating light is energized.
Warning: Wiring connections must be made in accordance with all applicable electrical codes and theseinstructions. Use copper wire only. Failure to follow this instruction can result in personal injury ordeath and/or property damage. 10-18 gauge wire recommended for 120 VAC connections with 9 in.lbs.max torque, 12-22 gauge wire for thermostat connections with 9 in.lbs. max torque, and 12-22 gaugewire for 24 VAC source with 5 in.lbs. max torque.
Instruction SheetSR502 & SR503 Switching Relay
Operation: When the thermostat calls for heat, the appropriate circu-lator is energized and the isolated end switch (X1 and X2) will start theboiler.Jumper Placement: The jumper should be placed between terminalsZC and H. Connect the isolated end switch, X1 and X2 to the boileraquastat control. For zone 1 priority, remove jumper betweenterminals P and ZC.
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 and appro-priate circulator are energized when the boiler temperature is above theset low limit.Jumper Placement: A jumper should be placed between terminals ZCand X1. Connect terminal ZC to ZC terminal on the aquastat control.Connect terminal ZR to ZR terminal on the aquastat control. Confirmpolarity is consistent between boiler aquastat and switching relay. Forzone 1 priority, remove jumper between terminalsP and ZC.Power Input: Connect 120 volt ac power input to terminals N and H.Neutral wire to terminal N. Hot wire to terminal H.
Note: When using Alternative Wiring diagram, the boiler operating control’s ZC terminal will see the load of the circulator(s). Warning: When using Alternative Wiring diagram, wiring instructions must be followed so power originates from the boiler aquastat. Failure tofollow these wiring instructions may result in a secondary source of power being connected to the boiler that may activate it under certain cir-cumstances, causing injury or death.
90
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ON
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VAC INPUT
TO: "TT" ON BOILER
ZONE1 ZONE2
ZONE3
ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
THERMOSTATS
FUSE 1 AMP
24 VACPOWER
SR 506
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
ZONE 5ZONE 6
JUMPER
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ON
OFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VACPOWER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VAC INPUT
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
ZONE1 ZONE2
ZONE3
ZONE4 ZONE5 ZONE6
THERMOSTATS
SR 506
ZONE 2
POWERZONE 1
ZONE 3
ZONE 4
ZONE 5ZONE 6
TO: "ZC" ON AQUASTAT
TO: "ZR" ON AQUASTAT
JUMPER
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.
Warning: Wiring connections must be made in accordance with all applicable electrical codesand these instructions. Use copper wire only. Failure to follow this instruction can result in per-sonal injury or death and/or property damage. 10-18 gauge wire recommended for 120 VAC con-nections with 9 in.lbs. max torque, 12-22 gauge wire for thermostat connections with 9 in.lbs.max torque, and 12-22 gauge wire for 24 VAC source with 5 in.lbs. max torque.
Cold Start BoilerApplication
Tankless Coil BoilerApplication
Specifications:PRODUCT NUMBER TRANSFORMER MAXIMUM DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR504 4 with Priority 120 VAC Input 20 amps 10 1/4" 6 3/4" 2 3/4"SR506 6 with Priority 120 VAC Input 20 amps 11 3/4" 7 1/2" 3"
All Switching Relays are relay type DPST, have a thermostat current of .18, and have a single phase motor rating per zone of 1/3 hp (7.2A) @ 120 VAC.
Instruction SheetSR504 & SR506 Switching Relay
Features: External Indicator LightsSwitchable PrioritySimplified WiringFully Enclosed Snap-Out RelaysCompact DesignFuse Protected100% Factory TestedIsolated End SwitchContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL Approved24 volt Power Input or Output TerminalExtended 3 Year WarrantyMade in the USA
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., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2005
TACO, Inc.
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.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 and appro-priate circulator are energized when the boiler temperature is above theset 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.Jumper Placement: MOVE the jumper between terminals ZC and ZRto end switch X and ZC. Connect terminal ZC to ZC terminal on theaquastat control. Connect the other end switch X to ZR terminal on theaquastat control. Confirm polarity is consistent between boiler aquas-tat 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.
Warning: When using Alternative Wiring diagram, wiring instructions must be followed so power originates from the boiler aquastat. Failure tofollow these wiring instructions may result in a secondary source of power being connected to the boiler that may activate it under certain cir-cumstances, causing injury or death.
91
TO: 120 VAC POWER
CIRCULATOR
POWER
T STAT
TO: "TT" on Boiler Aquastat
THERMOSTAT
TO: 120 VAC POWER
POWER
T STAT
TO: ZC on Boiler Control
TO: DHW Aquastat if PC700Boiler Reset is installed.
CIRCULATOR
THERMOSTAT
TO: ZR on Boiler Control
N ZC ZRH H HPOWERINPUT
120VACINPUT
120VACOUTPUT
CIRCOUTPUT
PRIORITYOUTPUT
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X COMT/WT/RX 1 12 243 X COMT/WT/RX 1 12 243
JUMPER
SR 501-EXP
RESET
POWERCONTROLS
FUSE1 AMP NORMAL
MODE
SR 501-EXP
RESET
POWERCONTROLS
FUSE1 AMP NORMALMASTER
SLAVE
MODE
FUSE5 AMP
TO: DHW Aquastat if PC700Boiler Reset is installed.
TT
K1-A
K1-B K2-A K2-A
K1 K2
N ZC ZRH H HPOWERINPUT
120VACINPUT
120VACOUTPUT
CIRCOUTPUT
PRIORITYOUTPUT
MASTER
SLAVE
FUSE5 AMP
K1-A
K1-B K2-A K2-A
K1 K2
Operation: When the thermostat calls for heat, the appropriate circulator is ener-gized and the isolated end switch (X and X) will start the boiler. Priority Outputhas power all the time, except when the thermostat is calling.
Mode Operation: When the mode switch is set to NORMAL, the end switchrelay will be energized if any zone is in operation. When the switch is set toRESET, the end switch relay will only be energized through the operation of aplug-in reset control or closure of Priority Input.Jumper Placement: The jumper should be placed between terminals ZC and H.Connect the isolated end switch to the aquastat control on the boiler.
Power Input: Connect 120 volt ac power input to terminals N and H. Neutralwire to terminal N. Hot wire to terminal H.Expansion Connections: Set the expansion switch to MASTER on the switchingrelay that has the designated priority zone or is utilizing the PowerPort options.Set all other daisy chained controls to SLAVE. Connect thermostat wire (18-22gauge) between terminals 1, 2, 3, 4 on the master control to the corresponding1, 2, 3, 4 on the SLAVE control(s). Controls may be daisy chained up to 20 zonesusing any combination of -EXP controls.
Operation: When the thermostat calls for heat, the appropriate circulator is ener-gized when the boiler’s aquastat is above the set low limit. The ZR (120VAC) out-put will signal the boiler to start. Priority Output has power all the time, exceptwhen the thermostat is calling.Mode Operation: When the mode switch is set to NORMAL, the end switchrelay will be energized if any zone is in operation. When the switch is set toRESET, the end switch relay will only be energized through the operation of aplug-in reset control or closure of Priority Input.Jumper Placement: REMOVE the jumper between terminals ZC and H. Connectterminal ZC to ZC terminal on the aquastat control. Connect terminal ZR to ZRterminal on the aquastat control. Confirm polarity is consistent between boileraquastat and switching relay.Power Input: Connect 120 volt ac power input to terminals N and H. Neutralwire to terminal N. Hot wire to terminal H.Expansion Connections: Set the expansion switch to MASTER on the switchingrelay that has the designated priority zone or is utilizing the PowerPort options.Set all other daisy chained controls to SLAVE. Connect thermostat wire (18-22gauge) between terminals 1, 2, 3, 4 on the master control to the corresponding1, 2, 3, 4 on the SLAVE control(s). Controls may be daisy chained up to 20 zonesusing any combination of -EXP controls.
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 with a minimum temperature rating of 60/75°C. Failure to follow this instruction canresult in personal injury or death and/or property damage. 12-18 gauge wire recommended for 120 VAC connections, 14-22 gauge wire for thermostat connections, and 14-22 gauge wire for 24 VAC sourceconnections.
Cold Start Boiler Application
Tankless Coil Boiler Application
Specifications:PRODUCT NUMBER POWER TRANSFORMER MAXIMUM DIMENSIONS OF ENCLOSURENUMBER OF ZONES CONTROLS VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR501-EXP 1 1 120 VAC Input 5.0 amps 4 1/4" 5 1/4" 2 3/4"
All Switching Relays are relay type DPDT, have a thermostat current of .18, and have asingle phase motor rating per zone of 1/3 hp (5.0A) @ 120 VAC.
Instruction SheetSR501-EXP Switching Relay
Features: External Indicator LightsIdeal for RetrofittingPriority OutputSimplified WiringAdd-On Power ControlsSealed RelaysCompact DesignFuse Protected100% Factory TestedIsolated End Switch
Expandable to 20 ZonesContractor Friendly PC Board
LayoutUniversal Thermostat
CompatibilityUL Approved24 volt Power Input or Output
TerminalExtended 3 Year WarrantyMade in the USA
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., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2005
TACO, Inc.
Warning: When using Alternative Wiring diagram, wiring instructions must be followed so power originates from the boiler aquastat. Failure tofollow these wiring instructions may result in a secondary source of power being connected to the boiler that may activate it under certain cir-cumstances, causing injury or death.
92
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ONOFF
PRIORITY
120V RELAY
PLUG-IN CARDS
FUSE 1 AMP
24 VACPOWER
EXPANSIONCONNECTIONS
SLAVE
MASTER
1234
RESET NORMAL
POWERCONTROLINTERFACE
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VAC INPUTTO: "TT" ON BOILER
ZONE1 ZONE2
ZONE3
ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
THERMOSTATS
SR 506-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4ZONE 5ZONE 6
JUMPER
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ONOFF
PRIORITY
120V RELAY
PLUG-IN CARDS
FUSE 1 AMP
24 VACPOWER
EXPANSIONCONNECTIONS
SLAVE
MASTER
1234
RESET NORMAL
POWERCONTROLINTERFACE
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWER
INPUT
120 VAC INPUT
ZONE1 ZONE2
ZONE3
ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
THERMOSTATS
SR 506-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4ZONE 5ZONE 6
TO: "ZC" ON AQUASTAT
TO: "ZR" ON AQUASTATJUMPER
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 is energized.
Warning: Wiring connections must be made in accordance with all applicable electrical codes and these instructions. Use copper wire only. Failure to follow this instruction can result in personal injury ordeath and/or property damage. 10-18 gauge wire recommended for 120 VAC connections with 9 in.lbs. max torque, 12-22 gauge wire for thermostat connections with 9 in.lbs. max torque, and 12-22 gauge wirefor 24 VAC source with 5 in.lbs. max torque.
Cold Start Boiler Application
Tankless Coil Boiler Application
Specifications:PRODUCT NUMBER POWER TRANSFORMER MAXIMUM DIMENSIONS OF ENCLOSURENUMBER OF ZONES PORTS VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR503-EXP 3 with Priority 3 120 VAC Input 20 amps 10 1/4" 6 3/4" 2 3/4"SR504-EXP 4 with Priority 3 120 VAC Input 20 amps 10 1/4" 6 3/4" 2 3/4"SR506-EXP 6 with Priority 3 120 VAC Input 20 amps 11 3/4" 7 1/2" 3"
All Switching Relays are relay type DPST, have a thermostat current of .18, and have a single phase motor rating per zone of 1/3 hp (7.2A) @ 120 VAC.
Instruction SheetSR503-EXP, SR504-EXP & SR506-EXP Switching Relay
Features: External Indicator Lights
Plug-In PowerPort CardsSwitchable PrioritySimplified WiringAdd-On Power ControlsFully Enclosed Snap-Out
RelaysCompact DesignFuse Protected100% Factory Tested
Isolated End SwitchExpandable to 20 ZonesContractor Friendly PC Board
LayoutUniversal ThermostatCompatibilityUL Approved24 volt Power Input or Output
TerminalExtended 3 Year WarrantyMade in the USA
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., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2005
TACO, Inc.
Operation: When any thermostat calls for heat, the appropriate circulator isenergized and the isolated end switch (X and X) will start the boiler.
Priority Operation: When zone 6 is switched to the priority setting and is actu-ated, all other zones will stop operation until zone 6 is satisfied. When zone 6 isnot switched to priority, all zones will operate independently.
Mode Operation: When the mode switch is set to NORMAL, the end switchrelay will be energized if any zone is in operation. When the switch is set toRESET, the end switch relay will only be energized if priority zone is in operation,or through the operation of a plug-in reset control.
Jumper Placement: The jumper should be placed between terminals ZC and ZR.Connect the isolated end switch to the aquastat control on the boiler.
Power Input: Connect 120 volt ac power input to terminals N and H. Neutralwire to terminal N. Hot wire to terminal H.
Expansion Connections: Set the expansion switch to MASTER on the switchingrelay that has the designated priority zone or is utilizing the PowerPort options.Set all other daisy chained controls to SLAVE. Connect thermostat wire (18-22gauge) between terminals 1, 2, 3, 4 on the master control to the corresponding1, 2, 3, 4 on the SLAVE control(s). Controls may be daisy chained up to 20 zonesusing any combination of -EXP controls.
Operation: When any thermostat calls for heat, the boiler and appropriate cir-culator are energized when the boiler temperature is above the set low limit.
Priority Operation: When zone 6 is switched to the priority setting and is actu-ated, all other zones will stop operation until zone 6 is satisfied. When zone 6 isnot switched to priority, all zones will operate independently.
Mode Operation: When the mode switch is set to NORMAL, the end switchrelay will be energized if any zone is in operation. When the switch is set toRESET, the end switch relay will only be energized if priority zone is in operation,or through the operation of a plug-in reset control.
Jumper Placement: MOVE the jumper between terminals ZC and ZR to endswitch X and ZC. Connect terminal ZC to ZC terminal on the aquastat control.Connect the other end switch X to ZR terminal on the aquastat control. Confirmpolarity is consistent between boiler aquastat and switching relay.
Power Input: Connect 120 volt ac power input to terminals N and H. Neutralwire to terminal N. Hot wire to terminal H.
Expansion Connections: Set the expansion switch to MASTER on the switchingrelay that has the designated priority zone or is utilizing the PowerPort options.Set all other daisy chained controls to SLAVE. Connect thermostat wire (18-22gauge) between terminals 1, 2, 3, 4 on the master control to the corresponding1, 2, 3, 4 on the SLAVE control(s). Controls may be daisy chained up to 20 zonesusing any combination of -EXP controls.
Warning: When using Alternative Wiring diagram, wiring instructions must be followed so power originates from the boiler aquastat. Failure tofollow these wiring instructions may result in a secondary source of power being connected to the boiler that may activate it under certain cir-cumstances, causing injury or death.
93
24 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
FUSE (5 A
MP M
AX
)
T T T T T T T T T T
ZVC 405
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5POWER
FIVE ZONE ZONE VALVE CONTROL
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER 120 VAC
INPUT
WHITE
BLACK
ENDSWITCH
N/O COM N/C
TT
TO CIRCULATOROR BOILERAQUASTAT RELAY
DRYCONTACTS
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
Operation/External Diagnostics: When any thermostatcalls for heat, the appropriate zone valve is energized andthe yellow light goes on. When the zone valve is fullyopen, the red light goes on and energizes the end switchrelay. The green light should always be on, indicating thatpower is connected.
The Taco Connection: Combine the reliability of the TacoZone Valves, Priority Zoning Circulators, Thermostats, andthe “00” family of circulators with the advanced features ofthe Taco Zone Controls to achieve total system integra-tion. No matter the application, Taco now provides theproducts to maximize system performance while simplify-ing both installation and service.
Warning: Wiring connections must be made in accordance with all applicableelectrical codes. Use copper wire only. Failure to follow this instruction can resultin personal injury or death and/or property damage. 10-18 gauge wire recom-mended for 120 VAC connections with 9 in.lbs. max torque, 12-22 gauge wire forthermostat connections with 9 in.lbs. max torque, and 12-22 gauge wire for 24VAC source with 5 in.lbs. max torque.
WiringDiagram
Specifications:PRODUCT NUMBER TRANSFORMER MAX OUTPUT DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE AT 24 VAC WIDTH HEIGHT DEPTH
ZVC403 3 Zone 120 VAC Input 40 VA 10 1⁄4" 6 3⁄4" 2 3⁄4"ZVC405 5 Zone 120 VAC Input 80 VA 113⁄4" 71⁄2" 3"
All Zone Valve Controls are relay type DPDT and have a single phase motor rating per zone of 1⁄6 hp (5A) @ 120 VAC.
Instruction SheetZVC403 & ZVC405 Zone Valve Control
Features: External Indicator Lights
Simplified WiringWorks with 2, 3, or 4-
Wire Zone ValvesCompact DesignFuse Protected100% Factory TestedIsolated End Switch
Extra Set of Dry ContactsContractor Friendly PC
Board LayoutUniversal Thermostat
CompatibilityUL ApprovedSturdy Screw ConnectionsExtended 3 Year WarrantyMade in the USA
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., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2000
TACO, Inc.
ENDSWITCH
N/O COM N/C
TT BOILER
HOT
NEUTRAL
120 VAC
Installation ofOptional SystemCirculator
94
24 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
MODENORMAL RESET
FUSE (7 A
MP M
AX
)
T T T T T T T T T T T T
ZONE 6 PRIORITY
OFF
ON
ZVC 406
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
INDIRECTWATER HEATERAQUASTATOR THERMOSTAT
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5T STAT 6VALVE 6POWER
SIX ZONE ZONE VALVE CONTROLWITH OPTIONAL PRIORITY
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
N/O COMZONE 6 RELAY
TT
TO CIRCULATOROR BOILERAQUASTAT RELAY
DRYCONTACTS
ENDSWITCH
EXTRAEND
SWITCH
MAIN N/C
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
Operation/External Diagnostics: When any thermostatcalls for heat, the appropriate zone valve is energized and theyellow light goes on. When the zone valve is fully open, thered light goes on and energizes the end switch relay. The greenlight should always be on, indicating that power is connected.
Priority Operation: When zone 6 is switched to the prioritysetting and is actuated, all other zones will stop operation untilzone 6 is satisfied. When zone 6 is not switched to priority, allzones will operate independently. Note: When a circulator isused on the priority zone instead of a zone valve, jumper 3 and4 of the priority zone.
Mode Operation: When the mode switch is set to NORMAL,the end switch relay will be energized if any zone is in opera-tion. When the switch is set to RESET, the end switch relaywill only be energized if priority zone is in operation.
The Taco Connection: Combine the reliability of the TacoZone Valves, Priority Zoning Circulators, Thermostats, and the“00” family of circulators with the advanced features of theTaco Zone Controls to achieve total system integration. Nomatter the application, Taco now provides the products tomaximize system performance while simplifying both instal-lation and service.
WiringDiagram
Specifications:PRODUCT NUMBER TRANSFORMER MAX OUTPUT DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE AT 24 VAC WIDTH HEIGHT DEPTH
ZVC404 4 with Priority 120 VAC Input 40 VA 101⁄4" 63⁄4" 23⁄4"ZVC406 6 with Priority 120 VAC Input 80 VA 113⁄4" 71⁄2" 3"
All Zone Valve Controls are relay type DPDT and have a single phase motor rating per zone of 1⁄6 hp (5A) @ 120 VAC.
Instruction SheetZVC404 & ZVC406 Zone Valve Control
Features: External Indicator LightsSwitchable PrioritySimplified 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
Warning: Wiring connections must be made in accordance with all applicable electrical codes. Use copperwire only. Failure to follow this instruction can result in personal injury or death and/or property damage.10-18 gauge wire recommended for 120 VAC connections with 9 in.lbs. max torque, 12-22 gauge wire forthermostat connections with 9 in.lbs. max torque, and 12-22 gauge wire for 24 VAC source with 5 in.lbs.max torque.
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., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2000
TACO, Inc.
Installation ofOptional Systemand/or DHW Circulator
N/O COM N/C
TT BOILER
HOT
NEUTRAL120 VAC
ENDSWITCH
EXTRAEND
SWITCH
MAIN
(See Note)
SYSTEM CIRCULATOR
DHW CIRCULATOR
95
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
INDIRECTWATER HEATERAQUASTATOR THERMOSTAT
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
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
�SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTOL
WITH OPTIONAL PRIORITY
24 VAC 24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO CIRCULATOROR BOILER
AQUASTAT RELAY
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
BOILER
ENDSWITCH
BPUMP
TO CIRCULATOROR BOILER
AQUASTAT RELAY
Operation/External Diagnostics: When any thermostat calls forheat, the appropriate zone valve is energized and the yellow light goeson. When the zone valve is fully open, the red light goes on and ener-gizes the end switch relays. The green light should always be on, indi-cating 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.Mode Operation: When the mode switch is set to NORMAL, both endswitch relays will be energized if any zone is in operation. When themode switch is set to RESET, the end switch relay “A” will only be ener-gized when the priority zone is in operation. The end switch relay “B”will be energized when any zone is in operationPower Input: Connect 120 volt ac power input to leads on trans-former. Neutral to white wire. Hot to black wire.Expansion Connections: Set the expansion switch to MASTER on thezone valve control that has the designated priority zone or is utilizingthe PowerPort options. Set all other daisy chained controls to SLAVE.Connect thermostat wire (18-22 gauge) between terminals 1, 2, 3, 4 onthe master control to the corresponding 1, 2, 3, 4 on the SLAVE control(s).Controls may be daisy chained up to 20 zones using any combinationof Switching Relay -EXP or Zone Valve -EXP controls.
The Taco Connection: Combine the reliability of the Taco Zone Valves,Priority Zoning Circulators, Thermostats, and the “00” family of circula-tors with the advanced features of the Taco Zone Controls to achievetotal system integration. No matter the application, Taco now providesthe products to maximize system performance while simplifying bothinstallation and service.
WiringDiagram
Specifications:PRODUCT NUMBER TRANSFORMER MAX OUTPUT DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE AT 24 VAC WIDTH HEIGHT DEPTH
ZVC404-EXP 4 with Priority 120 VAC Input 80 VA 113⁄4" 71⁄2" 3"ZVC406-EXP 6 with Priority 120 VAC Input 80 VA 113⁄4" 71⁄2" 3"
All Zone Valve Controls are relay type DPDT and have a single phase motor rating per zoneof 1⁄6 hp (5A) @ 120 VAC.
Instruction SheetZVC404-EXP & ZVC406-EXP Zone Valve Control
Features:External Indicator LightsPlug-In PowerPort CardsSwitchable PrioritySimplified WiringAdd-On Power ControlsWorks with 2, 3, or 4-Wire
Zone ValvesUL ApprovedFuse Protected100% Factory Tested
Isolated End SwitchExpandable to 20 ZonesExtra Set of Dry ContactsContractor Friendly PC
Board LayoutUniversal Thermostat
CompatibilitySturdy Screw ConnectionsExtended 3 Year WarrantyMade in the USA
Warning: Wiring connections must be made in accordance with all applicable electrical codes. Use copper wire only. Failure to follow this instruction can result in personal injury or death and/or propertydamage. 10-18 gauge wire recommended for 120 VAC connections with 9 in.lbs. max torque, 12-22 gauge wire for thermostat connections with 9 in.lbs. max torque, and 12-22 gauge wire for 24 VAC source with5 in.lbs. max torque.
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., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2000
TACO, Inc.
N/O COM N/C
T TBOILER
HOTNEUTRAL
120 VAC
(See Note)
SYSTEMCIRCULATOR
DHWCIRCULATOR
ENDSWITCH
ABOILER
ENDSWITCH
BPUMP
Installation ofOptional Systemand/or DHW Circulator
96
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.
Warning:Wiring connections must be made in accordance withall applicable electrical codes. Use copper wire only.Failure to follow this instruction can result in personalinjury or death and/or property damage. 10-18 gaugewire recommended for 120 VAC connections with9 in.lbs. max torque, 12-22 gauge wire for thermostatconnections with 9 in.lbs. max torque, and 12-22 gaugewire for 24 VAC source with 5 in.lbs. max torque.
M
FanRelay
Line
24 V
AC
1 Speed Air Handler*
THERMOSTAT
Optional Power Wireto Thermostatthat Requires 24VAC
To: OptionalAquastat onReturn Line ofHydro Coil
Dry ContactsTo: “T T” onBoiler orSwitchingRelay
Power OnCall for HeatFan, CoolingFan, Heating
OutdoorCondenserUnit
T T
BOILER AIR HANDLER
G GX X C R Y
C R GYWTHERMOSTAT AQUASTATS
HAFC201HYDRO AIR FAN CONTROL
TTWATER COIL FREEZE PR
To: Optional Aquastator Thermostat to senselow ambienttemperature
Hot
Neutral
Circulator
XXPUMP
5 AMP 1/6 HP RATEDDRY CONTACTS
1 MIN
ON
DELA
Y - FAN
3 MIN
ON
DELA
Y - FAN
2 MIN
@ 24 H
R - PUM
P30 SEC
@ 2 W
K - PUM
P
OFF O
N
Jumper
(or to “T T” onswitching relay)
2 Speed Air Handler*
THERMOSTAT
Optional Power Wireto Thermostatthat Requires 24VAC
To: Aquastat onReturn Line ofHydro Coil
Dry ContactsTo: “T T” on Boileror Switching Relay
Power OnCall for HeatFan, CoolingFan, Heating
OutdoorCondenserUnit
T T
BOILER AIR HANDLER
G GX X C R Y
C R GY TWTHERMOSTAT AQUASTAT
HAFC101HYDRO AIR FAN CONTROL
M
Low
Hig
h
Line
24 V
AC
Fan
Rela
ys
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 PHAZE MOTOR DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD TYPE CURRENT RATING (RELAY) WIDTH HEIGHT DEPTH
HAFC101** 1 Zone 24 VAC Input 5 amps DPDT .18 1/6 HP(5A) @120VAC 4 1/4" 5 1/4" 2 3/4"HAFC201•• 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.
Instruction SheetHydro Air Fan Controls
Printed in USA
Copyright 1999
TACO, Inc.
* Both HAFC101 and 201 capable of 1 and 2 speed applications
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., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 1999
TACO, Inc.
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., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Printed in USA
Copyright 2000
TACO, Inc.
Instruction SheetPC600 Post Purge Timer Plug-In PowerPort Card
102-094
SUPERSEDES: August 1, 1997 EFFECTIVE: May 1, 2000
Plant ID No. 9300-867
Operation:Once the priority zone is satisfied, the PC600 maintains power to the circulator, but does not fire the boiler. The circulator purges excess heat into the priority zone,minimizing standby loss during warm weather months and optimizing boiler operation when used with a boiler reset control. Power can be maintained to the circu-lator from a minimum of 10 seconds to a maximum of 420 seconds. The power LED light is energized when the priority zone or the post purge card is in operation.Installation:The PC600 can be installed in any one of the PowerPort terminals located on the Taco Expandable (-EXP) Control(s). Remove the shunt/jumper between pins 9& 10 on the PowerPort terminal before installing the PC600. Align the connector on the base of the post purge card with the PowerPort terminal on the ExpandableControl and push until the two mate.XX Terminals (Optional):The XX terminals on the post purge card can be wired to TT on the boiler to fire only when the priority zone is calling for heat. If using a boiler with an internalreset control, wire the XX terminals in parallel with the TT connections of the internal reset control.
Instruction SheetPC605 Priority Protection Plug-In PowerPort Card
102-095
SUPERSEDES: MAY 1, 1998 EFFECTIVE: MAY 1, 2000
PLANT ID NO. 9300-1012
Operation:The PC605 Priority Protection Plug-In Card is a solid state control that helps prevent freeze-ups in the event of a priority zone failure. If the priority zone calls for heatcontinuously for more than one hour, power is returned to the space heating (non-priority) zones, allowing all zones to function independently. Once the priority zone issatisfied, the PC605’s auto-reset is activated and the priority zone is again allowed to have priority for up to one hour the next time it calls. The one hour time frame isnot adjustable. The red LED light is energized only when the Priority Protection Card is operating in priority override mode.
Installation:The PC605 can be installed in any unoccupied PowerPort terminal located on the Taco Expandable (-EXP) Control(s). Do not remove the shunt between pins 9 &10 on the Expandable Control unless a PC600 is also installed. Align the connector on the base of the priority protection card with the PowerPort terminal on theExpandable Control and push until the two mate. The PC605 can be used in conjunction with any other Taco PC style PowerPort Cards or Add-on Controls.
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., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Printed in USA
Copyright 2000
TACO, Inc.
Operation:The PC610 Pump Exercise and Timer Plug-In Card is a solid state universal timer designed to cycle all the pumps that are attached to the Expandable Control(s)at selected time intervals. This minimizes seasonal start-up problems generally associated with harsh water conditions. The control can be configured to reducethe chance of freeze-ups by cycling the pumps more often during cold weather months. Bacteria can be minimized in heating systems that utilize domestic hotwater heaters as their heat source by systematically circulating the water.
Installation:The PC610 can be installed in any unoccupied PowerPort terminal located on the Taco Expandable (-EXP) Control(s). Do not remove the shunt between pins 9 & 10 onthe Expandable Switching Relay unless a PC600 is also installed. Align the connector on the base of the priority protection card with the PowerPort terminal on theExpandable Switching Relay and push until the two mate. The PC610 can be used in conjunction with any other Taco PC style PowerPort Cards or Add-on Controls.
Typical Settings:
Instruction SheetPC610 Pump Exercise and Timer Plug-In PowerPort Card
102-096
SUPERSEDES: May 31, 1998 EFFECTIVE: May 1, 2000
Plant ID No. 9300-1025
Application On Time Off TimePump Exercise 30 sec. 2 weeks
Bacteria Minimization 4 min. 12 hoursFreeze Protection 4 min. 1 hour
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., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Printed in USA
Copyright 2000
TACO, Inc.
97
98
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
99
TACO
Zon
e Co
ntro
ls Cr
oss-
Refe
renc
e
TA
CO
AR
GO
ER
IEH
ON
EY
WE
LL
WH
ITE
-RO
GE
RS
SW
ITC
HIN
G R
EL
AY
S
1 Z
one
Switc
hing
Rel
ay (
DPD
T)
SR50
1A
R82
1 (1
),A
R82
2SR
100
RA
89A
(2)
,RA
845A
(1)
,RA
832A
(1)
889-
189
(2),
829-
845
(1)
1 Z
one
Switc
hing
Rel
ay R
epla
cem
ent
PC B
oard
(D
TSP
)SR
501-
845R
P2
Zon
e Sw
itchi
ng R
elay
with
Pri
ority
SR50
2A
R-8
61-2
(3)
SR20
13
Zon
e Sw
itchi
ng R
elay
with
Pri
ority
SR50
3A
R-8
61-3
(3)
SR30
1R
8888
A10
074
Zon
e Sw
itchi
ng R
elay
with
Pri
ority
SR50
4A
R-8
42SR
601
R88
88B1
005
6 Z
one
Switc
hing
Rel
ay w
ith P
rior
itySR
506
AR
-866
SR60
1 (4
)
SW
ITC
HIN
G R
EL
AY
SW
ITH
PO
WE
RP
OR
T O
PT
ION
S
3 Z
one
Switc
hing
Rel
ay w
ith P
rior
ity a
nd 3
Pow
er P
orts
SR50
3-EX
PA
RM
-861
-DP
(5,6
),A
RM
-3P
4 Z
one
Switc
hing
Rel
ay w
ith P
rior
ity a
nd 3
Pow
er P
orts
SR50
4-EX
PA
RM
-842
-DP
(5,6
),A
RM
-4P
6 Z
one
Switc
hing
Rel
ay w
ith P
rior
ity a
nd 3
Pow
er P
orts
SR50
6-EX
PA
RM
-866
-DP
(5,6
),A
RM
-6P
ZO
NE
VA
LVE
CO
NT
RO
LS
3 Z
one
Valv
e C
ontr
olZ
VC
403
(7)
AZ
-3R
8889
A10
144
Zon
e Va
lve
Con
trol
with
Pri
ority
ZV
C40
4 (7
)A
Z-4
PR
8889
B101
25
Zon
e Va
lve
Con
trol
ZV
C40
5 (7
)A
Z-5
VL5
00 (
8)6
Zon
e Va
lve
Con
trol
with
Pri
ority
ZV
C40
6 (7
)A
Z-6
PV
L500
(8)
ZO
NE
VA
LVE
CO
NT
RO
LS
WIT
H P
OW
ER
PO
RT
OP
TIO
NS
4 Z
one
Valv
e C
ontr
ol w
ith P
rior
ity a
nd 2
Pow
er P
orts
ZV
C40
4-EX
P6
Zon
e Va
lve
Con
trol
with
Pri
ority
and
2 P
ower
Por
tsZ
VC
406-
EXP
PL
UG
IN
PO
WE
RP
OR
T C
AR
DS
Post
Pur
ge T
imer
Plu
g-In
Car
dPC
600
Prio
rity
Pro
tect
ion
Plug
-In C
ard
PC60
5D
PM-1
Uni
vers
al T
imer
/Pum
p Ex
erci
ze P
lug-
In C
ard
PC61
0
100
TACO
Zon
e Co
ntro
ls Cr
oss-
Refe
renc
e (C
ontin
ued)
TA
CO
AR
GO
ER
IEH
ON
EY
WE
LL
WH
ITE
-RO
GE
RS
AD
D-O
N P
OW
ER
CO
NT
RO
LS
Boile
r R
eset
Con
trol
PC70
0D
PM-2
BB12
002-
Stag
e Bo
iler
Res
et C
ontr
olPC
702
Vari
able
Spe
ed P
ump
Inje
ctio
n M
ixin
g C
ontr
olPC
705
BB30
00
FAN
CO
NT
RO
LS
1 Z
one
Hyd
ro A
ir F
an C
ontr
ol (
1 or
2 S
peed
)H
AFC
101
AR
H-1
,AR
H-2
,AR
H-3
WA
300
1 Z
one
Hyd
ro A
ir F
an C
ontr
ol w
ith T
ime
Del
ays
(1 o
r 2
Spee
d)H
AFC
201
RE
PL
AC
EM
EN
T P
AR
TS
24 V
olt
Rep
lace
men
t R
elay
SR02
4-00
1RP
R-3
5EX
P10
120
Volt
Rep
lace
men
t R
elay
SR12
0-00
1RP
R-4
9
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
20 z
ones
usi
ng a
ny c
ombi
natio
n of
-EX
P m
odel
s w
ith n
o sp
ecia
l con
nect
ions
.6.
Incl
udes
onl
y on
e da
ta p
ort
for
addi
ng d
ata
port
mod
ules
.7.
All
TAC
O z
one
valv
e co
ntro
ls in
clud
e an
ext
ra s
et o
f dry
con
tact
s (N
/O,C
omm
on,N
/C).
8.V
L500
is o
nly
5 zo
nes,
4 no
rmal
and
1 p
rior
ity.
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.