WARNING IMPORTANT - Growers Solution diagrams – models hd/hdb, hds/hdc, pts/bts 6-461.1 3 blower motor p1-7 * integrated control 115v inducer motor spark ignitor 24v mv p1-9 p1-2

6-461.1

September, 2009

WIRING DIAGRAMS gas-fired, power vented and separated combustion unit heaters

for models HD/HDB, HDS/HDC, PTS/BTS, PTC

THIS MANUAL IS THE PROPERTY OF THE OWNER. PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN YOU LEAVE THE JOB.

Modine Manufacturing Company has a continuous product improvement program, and therefore reserves the right to change design and specifications without notice.

WARNING

1. Fuel supply shall be shut-off and the electrical power disconnected before proceeding with the installation. Failure to do so could result in fire, explosion, electrical shock, or the unit starting suddenly resulting in injury.

2. All units must be wired strictly in accordance with wiring diagram furnished with the unit. Failure to wire this unit according to this wiring diagram could result in a hazard to persons and property. For deviations, contact the factory.

3. All wiring must be done with a wiring material having a temperature rating of at least 105°C.

IMPORTANT

1. The use of this manual is specifically intended for a qualified installation and service agency. All installation and service of these kits must be performed by a qualified installation and service agency.

2. These instructions must also be used in conjunction with the Installation and Service manual originally shipped with the appliance being converted, in addition to any other accompanying component supplier literature which supersedes these instructions.

Diagram Selection Diagrams are provided for both single and three-phase circuits, and are readily identified in the selection table on page 2. The selection table enables easy selection of the correct wiring diagram after the electrical components of the unit heater have been determined. NOTE: As indicated in every diagram, all wiring must comply with the National Electrical Code and all local codes. All components must agree with their respective power source.

Abbreviations and Symbols

To facilitate interpretation and enable simplification the abbreviations and symbols have been selected as recommended by ANSI (American National Standards Institute) and NEMA (National Electrical Manufacturers Association) standards.

XFMR or TR Transformer

H1, H2, etc. Transformer Primary Terminals

X1, X2, etc. Transformer Secondary Terminals

V Volts

Hz Hertz

ø Phase

RC Relay Contactor Coil

G Ground

H Hot

SW Switch

HI High

LO Low

C Common

“J” Box Junction Box

S/W Summer/Winter Switch

O.L.C. Overload Contacts

SPDT Single Pole Double Throw Switch

DPDT Double Pole Double Throw Switch

VA Volt-Ampere

L1, L2, L3 Load Terminals (Connect to Supply Voltage)

T1, T2, T3 Motor or Motor Starter Terminals

Wire Color Coding

BK Black

BR Brown

BL Blue

R Red

W White

GY Gray

Y Yellow

WIRING DIAGRAM SELECTION

2 6-461.1

Select the correct wiring diagram as follows:

1. Determine the 12 digit unit heater model number. Example: PTS350SS0122

2. Breakdown the model number into the following parts (using the above example):

a. Model: PTS

b. Size : 350

c. Power Code: 01

d. Control Code: 22

3. Review the model number breakdown against Table 2.1 to select the correct wiring diagram.

For the example in Step 2 above, the correct wiring diagram is located on page 6.

4. Review Table 2.2 to determine if any additional wiring diagrams are necessary based on accessories included.

Table 2.1 – Unit Heater Wiring Diagram Page Location Index

Type Model Size Power Code Supply Voltage Control Code

Gas Controls Wiring

Diagram Page

11 or 21 Single Stage 5H079963B1 3 HD/HDS 30-125 01 ! 115V/1ph

12 or 22 Two Stage 5H079963B2 4

11 or 21 Single Stage 5H079963B1 3 150-350 01 ! 115V/1ph

12 or 22 Two Stage 5H079963B2 4

11 or 21 Single Stage 5H079963B3 5 PTS

400 01 ! 115V/1ph 12 or 22 Two Stage 5H079963B4 6

135-215 01 ! 115V/1ph 11 or 21 Single Stage 5H080716B1 11

Pro

pe

lle

r

PTC 260-310 01 ! 115V/1ph 11 or 21 Single Stage 5H080716B2 12

11 or 21 Single Stage 5H079963B1 3 HDB/HDC 60-125 01 " 115V/1ph

12 or 22 Two Stage 5H079963B2 4

11 or 21 Single Stage 5H079963B1 3 150 01 " 115V/1ph

12 or 22 Two Stage 5H079963B2 4

11 or 21 Single Stage 5H080273B1 7 02, 13, 24,35 " 115/230V/1ph

12 or 22 Two Stage 5H080273B2 8

11 or 21 Single Stage 5H080274B1 9

Blo

we

r

BTS

150-400 08, 11, 19, 22, 30, 33, 38, 41, 42, 44, 49, 53, 55, 60,

64, 66, 71, 75, 77 " 208/230/460/575V/3ph

12 or 22 Two Stage 5H080274B2 10

! All propeller models (HD/HDS/PTS/PTC) are Power Code 01 for 115V/60Hz/1ph supply voltage only. To operate the unit on a supply voltage other than 115V/1ph, an accessory step down transformer is required. Refer to the latest revision of Literature #6-567 for instructions on properly wiring the unit heater and transformer.

" All blower models (HDB/HDC/BTS) that are operated with a supply voltage other than 115V/1ph, an accessory step down transformer is required. Refer to the latest revision of Literature #6-567 for instructions on properly wiring the unit heater and transformer.

Table 2.2 – Accessory Wiring Diagram Page Location Index Model Accessory Page

All Thermostat with Fan On/Auto Subbase Switching 13

All Thermostat without Fan On/Auto Subbase Switching and Summer/Winter Switch 13

All Wiring Multiple Single Stage Unit Heaters to a Single Thermostat 14

PTC Terminal Board Jumper Removal for Accessory Wiring 14

WIRING DIAGRAMS – MODELS HD/HDB, HDS/HDC, PTS/BTS

6-461.1 3

BL

OW

ER

MO

TO

R

P1

-7

* IN

TE

GR

AT

ED

CO

NT

RO

L

11

5V

IND

UC

ER

MO

TO

RS

PA

RK

IGN

ITO

R

24

V

MV

P1

-9P

1-2

PRESSURE

P1

-5P

1-3

SE

C

P1

-6

CO

M

P1-4

FLAMESENSOR

GASVALVE

ROLLOUT

HIGH LIMIT

THERMOSTAT

L1

IND

P1-8

W

GN

D

L1

L2

CALL FOR HEAT

ROLLOUT

NT

RL

NT

RL

NT

RL

NT

RL

L1

EA

C

R

FUSE

C

11

5V

/60

HZ

/1Ø

CIR

CU

ITB

RE

AK

ER

(BY

OT

HE

RS

)

HIGH LIMIT

RE

FE

RN

OT

E 7

11

5V

Un

it P

ow

er

IND

ICA

TE

S T

ER

MIN

AL

BO

AR

D C

ON

NE

CT

ION

SIN

GL

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TA

GE

, D

IRE

CT

SP

AR

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F, M

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EN

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GF

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GW

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24

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WN

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H U

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NO

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7 85

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9

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GN

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M

L1

, (B

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R

YP

IN 6

12

0

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OT

OR

Y

WH

BK

SE

C

PIN

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MR

PR

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H

PE

MO

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R

LO

W V

OL

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GE

TH

ER

MO

ST

AT

(BY

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HE

RS

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LIM

ITC

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TR

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AS

VA

LV

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11

5V

/60

HZ

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PO

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RC

IRC

UIT

BR

EA

KE

R (

BY

OT

HE

RS

)

FL

AM

ES

EN

SO

R

BL

GR

, (G

)

BK

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L2

, (W

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N E U T R A L

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SP

AR

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TR

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24

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CN E U T R A L

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C/B

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M1

PA

RK

CO

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5H

07

99

63

B1

RE

V L

LIM

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ON

TR

OL

(SE

E N

OT

E 5

)

L1, (BK)

SW

ITC

HR

EF

ER

NO

TE

7

FL

AM

E R

OL

LO

UT

S(S

EE

NO

TE

6)

5H

07

99

63

B1

WIR

ING

DIA

GR

AM

, S

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LE

ST

AG

E

NO

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S T

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ST

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R:

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ALL

WIR

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MU

ST

CO

MP

LY

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H N

AT

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AL

ELE

CT

RIC

CO

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AN

D A

LL

LO

CA

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OD

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2.

ALL

CO

MP

ON

EN

TS

MU

ST

AG

RE

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ITH

T

HE

IR R

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PE

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IVE

PO

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4. U

SE

TY

PE

10

5°C

RE

PLA

CE

ME

NT

WIR

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300V

OR

GR

EA

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R.

5. U

SE

D O

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RO

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LLE

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OD

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ND

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RG

ER

.

6. T

WO

SW

ITC

HE

S: 3

0-7

5,

ON

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: 1

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ON

150-4

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NIT

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7.

OP

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DIS

CO

NN

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T S

WIT

CH

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CA

UT

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TH

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G D

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AY

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RY

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ST

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R O

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DT

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PA

RK

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ER

MIN

AL

S


4 6-461.1

5H

07

99

63

B2

BL

OW

ER

MO

TO

R

CO

M

* IN

TE

GR

AT

ED

CO

NT

RO

L

115V

IND

UC

ER

MO

TO

R

SP

AR

KIG

NIT

OR

P3

P7

P2

GW

1P

4

FLAMESENSOR

LOFIRE

W1

HIGH LIMIT

RP

6

GN

D

L1

L2

ROLLOUT

IND

FS

P8

11

5V

/60

HZ

/1Ø

CIR

CU

ITB

RE

AK

ER

(BY

OT

HE

RS

)

W2

P9

24

V

24

V

HI

IND

HE

AT

L1

HIFIRE

WH

ITE

RO

GE

RS

GA

S V

ALV

E

ROLLOUT

CALL FORHEAT

PR

ES

SU

RE

SW

ITC

H

W2

T-S

TA

TH

IC

OM

M

HO

NE

YW

ELL

GA

S V

ALV

E

HI

LO

CO

M

HIGH LIMIT

115

V U

nit P

ow

er

RE

FE

RN

OT

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IND

ICA

TE

S T

ER

MIN

AL

BO

AR

D C

ON

NE

CT

ION

TW

O S

TA

GE

, D

IRE

CT

SP

AR

K I

GN

ITIO

N,

10

0%

SH

UT

-OF

F, M

ULT

IPLE

RE

TR

Y W

/ A

UT

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ES

ET

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OM

LO

CK

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T

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ING

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ND

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OR

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CO

MP

ON

EN

T W

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GF

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D W

IRIN

GW

IRE

NU

T

LIN

E

24

V

14

7 85

2 36

9

G W1

C RY

GN

D

O

WH

CO

M

L1

, (B

K)

R

Y1

20

R

CO

M

24

R

FA

NM

OT

OR

Y

WH

BK

24

V

PIN

8Y

XF

MR

PR

ES

SU

RE

SW

ITC

H

PE

MO

TO

R

CA

LL

FO

R F

AN

LIM

ITC

ON

TR

OL

CO

M1

15

V/6

0H

Z/1

Ø P

OW

ER

CIR

CU

IT B

RE

AK

ER

(B

Y O

TH

ER

S)

FL

AM

ES

EN

SO

R

BL

BK

L2, (WH)

L2

, (W

H)

FSL1

HE

AT

PA

RKS

PA

RK

IGN

ITO

R

UT

LA

BE

L

IGN

ITIO

NC

ON

TR

OL

PA

RK

FL

AM

E R

OL

LO

UT

S(S

EE

NO

TE

6)

IND

WH

ITE

RO

GE

RS

GA

S V

AL

VE

CO

M

HI

M

W2

LO

W V

OL

TA

GE

TH

ER

MO

ST

AT

(BY

OT

HE

RS

)

1S

T S

TA

GE

2N

D S

TA

GE

CO

M

HO

NE

YW

EL

LG

AS

VA

LV

E

HI

LO

LIM

IT C

ON

TR

OL

(SE

E N

OT

E 5

)

L1, (BK)

SW

ITC

HR

EF

ER

NO

TE

7

115

V U

nit P

ow

er

WIR

ING

DIA

GR

AM

, T

WO

ST

AG

E

NO

TE

S T

O IN

ST

ALL

ER

:

1. A

LL W

IRIN

G M

US

T C

OM

PL

Y W

ITH

NA

TIO

NA

L

E

LE

CT

RIC

CO

DE

AN

D A

LL

LO

CA

L C

OD

ES

.

2. A

LL C

OM

PO

NE

NT

S M

US

T A

GR

EE

WIT

H

T

HE

IR R

ES

PE

CT

IVE

PO

WE

R S

OU

RC

E.

3. V

ER

IFY

TH

E P

OW

ER

SO

UR

CE

AN

D

T

HE

UN

IT P

OLA

RIT

Y.

4. U

SE

TY

PE

105°C

RE

PL

AC

EM

EN

T W

IRE

3

00

V O

R G

RE

AT

ER

.

5. U

SE

D O

N P

RO

PE

LL

ER

MO

DE

LS

100 A

ND

LA

RG

ER

.

6. T

WO

SW

ITC

HE

S:

30-7

5,

ON

E S

WIT

CH

: 1

00-1

25

N

OT

US

ED

ON

15

0-4

00

UN

ITS

.

7. O

PT

ION

AL

UN

IT D

ISC

ON

NE

CT

SW

ITC

H.

CA

UT

ION

:F

AIL

UR

E T

O W

IRE

TH

IS U

NIT

AC

CO

RD

ING

TO

TH

IS W

IRIN

G D

IAG

RA

M M

AY

RE

SU

LT

IN IN

JU

RY

TO

TH

E IN

ST

AL

LE

R O

R U

SE

R.

FO

R D

EV

IAT

ION

S C

ON

TA

CT

TH

E F

AC

TO

RY

.

MO

TO

R L

EA

D C

OL

OR

FO

R D

IRE

CT

DR

IVE

BL

OW

ER

MO

TO

RS

ON

LY

.

W

H-N

EU

TR

AL

B

K-H

I

BL-M

ED

R

ED

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AT

TA

CH

WIR

ES

NO

T U

SE

DT

O "

PA

RK

" T

ER

MIN

AL

S

UN

ITS

AR

E F

AC

TO

RY

WIR

ED

FO

R H

IGH

SP

EE

D O

PE

RA

TIO

N.


6-461.1 5

14

7 85

2 36

9

G W R CY

GN

D

O

WH

CO

M

L1

, (B

K)

R

YP

IN 6

120

R

CO

M

24

R

FA

NM

OT

OR

Y

WH

BK

SE

C

PIN

5Y

XF

MR

PR

ES

SU

RE

SW

ITC

H

PE

MO

TO

R

LO

W V

OL

TA

GE

TH

ER

MO

ST

AT

(BY

OT

HE

RS

)

LIM

IT

GA

SV

ALV

E

115V

/60H

Z/1

ØU

NIT

PO

WE

RC

IRC

UIT

BR

EA

KE

R

(BY

OT

HE

RS

)F

LA

ME

SE

NS

OR

BL

BK

L2, (WH)

L2, (W

H)

N E U T R A L

INDL1

L1

EA

C

PA

RK

HO

NE

YW

EL

LLA

BE

L

SP

AR

KIG

NIT

OR

UT

LA

BE

L

IGN

ITIO

NC

ON

TR

OL

CO

M

24V

ACN E U T R A L

IND

XF

MRL1

EA

C/B

LO

M1

PA

RK

CO

OL

LIM

ITC

ON

TR

OL

L1, (BK)

SW

ITC

H

RE

FE

RN

OT

E 6

10

68

7

24

3

115

V U

nit P

ow

er

5H

07

99

63

B3

WIR

ING

DIA

GR

AM

, S

ING

LE

ST

AG

E,

RE

LA

Y

IND

ICA

TE

S T

ER

MIN

AL

BO

AR

D C

ON

NE

CT

ION

WIR

ING

LE

GE

ND

FA

CT

OR

Y W

IRIN

GIN

TE

RN

AL

CO

MP

ON

EN

T W

IRIN

GF

IEL

D W

IRIN

GW

IRE

NU

T

LIN

E

24

V

FA

NM

OT

OR

P1

-7

* IN

TE

GR

AT

ED

CO

NT

RO

L

11

5V

PE

MO

TO

R

SP

AR

KIG

NIT

OR

24

V

MV

P1

-9P

1-2

PRESSURE

P1

-5P

1-3

SE

C

P1

-6

CO

M

P1-4

FLAMESENSOR

GASVALVE

HIGH LIMIT

THERMOSTAT

L1

IND

P1

-8W

GN

D

L1

L2

CALL FOR HEAT

NT

RL

NT

RL

NT

RL

NT

RL

L1

EA

C

R

FUSE

C

115V

/60H

Z/1

ØU

NIT

CIR

CU

ITC

IRC

UIT

BR

EA

KE

R(B

Y O

TH

ER

S)

HIGH LIMIT

0 1

34

2 68

7

115

V U

nit P

ow

er

Se

e n

ote

#6

for

moto

rconn

ections

RE

FE

R N

OT

E 7

SIN

GL

E S

TA

GE

, D

IRE

CT

SP

AR

K I

GN

ITIO

N,

100

% S

HU

T-O

FF

, M

ULT

IPL

E R

ET

RY

W/

AU

TO

RE

SE

T F

RO

M L

OC

KO

UT

NO

TE

S T

O IN

ST

ALL

ER

:

1. A

LL W

IRIN

G M

US

T C

OM

PL

Y W

ITH

NA

TIO

NA

L

E

LE

CT

RIC

CO

DE

AN

D A

LL

LO

CA

L C

OD

ES

.

2. A

LL C

OM

PO

NE

NT

S M

US

T A

GR

EE

WIT

H

T

HE

IR R

ES

PE

CT

IVE

PO

WE

R S

OU

RC

E.

3. V

ER

IFY

TH

E P

OW

ER

SO

UR

CE

AN

D

T

HE

UN

IT P

OLA

RIT

Y.

4. U

SE

TY

PE

105°C

RE

PL

AC

EM

EN

T W

IRE

3

00

V O

R G

RE

AT

ER

.

5. U

SE

D O

N P

RO

PE

LL

ER

MO

DE

LS

100 A

ND

LA

RG

ER

.

6. O

PT

ION

AL

UN

IT D

ISC

ON

NE

CT

SW

ITC

H.

CA

UT

ION

:F

AIL

UR

E T

O W

IRE

TH

IS U

NIT

AC

CO

RD

ING

TO

TH

IS W

IRIN

G D

IAG

RA

M M

AY

RE

SU

LT

IN IN

JU

RY

TO

TH

E IN

ST

AL

LE

R O

R U

SE

R.

FO

R D

EV

IAT

ION

S C

ON

TA

CT

TH

E F

AC

TO

RY

.

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WIRING DIAGRAMS – MODEL PTC

12 6-461.1

WIR

ING

DIA

GR

AM

, P

TC

, R

ELA

Y

5H

08

07

16

B2

IND

ICA

TE

S T

ER

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AL

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AR

D C

ON

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CT

ION

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FA

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OR

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AL

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ON

EN

T W

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IRIN

GW

IRE

NU

T

LIN

E

24

V

PE

LIM

ITC

ON

TR

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MA

NU

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RE

SE

T

14

7 85

2 36

9

G W R CY

GN

D

O

W

CO

M

R

YP

IN 6

120

R

CO

M

24

R Y

BL

SE

C

PIN

5Y

XF

MR

PR

ES

SU

RE

SW

ITC

H

PE

MO

TO

R

GR

N

GA

SV

ALV

E

11

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/60H

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OW

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CIR

CU

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RE

AK

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(BY

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RS

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FLA

ME

SE

NS

OR

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GR

, (G

)

L2, (W)

N E U T R A L

INDL1

L1

PA

RK

HO

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L

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AR

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(BY

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R

BK

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(BK

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(W)

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NM

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T1

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GV

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W

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BR W

*SH

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UN

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EC

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AR

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SP

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MV

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LV

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PE

N

P1-2

PRESSURE

P1-5

P1-3

SE

C

P1-6

CO

M

P1-4

FLAME SENSOR

GAS VALVE

HIGH LIMITAUTO RESET

8

IND

P1-8

W

GN

D

L1

L2

NT

RL

NT

RL

NT

RL

NT

RL

L1

L1

R

FUSE

C

11

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CU

IT B

RE

AK

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(BY

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RS

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ow

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GR

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TO

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TO

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76

40

2

1

3

EA

C

FA

NM

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OR

TH

ER

MO

ST

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CALL FORHEAT

T2

AM

BE

RC

AL

L F

OR

HE

AT

VC

T1

F

NO

TE

S T

O IN

ST

AL

LE

R:

1. A

LL

WIR

ING

MU

ST

CO

MP

LY

WIT

H N

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ION

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E

LE

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CO

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EN

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IVE

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OU

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3. V

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TH

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SO

UR

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AN

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UN

IT P

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4. U

SE

TY

PE

105°C

RE

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AC

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EN

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IRE

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CA

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WIRING DIAGRAMS – THERMOSTAT & SUMMER/WINTER SWITCH

13 6-461.1

Single Stage Thermostat & Summer/Winter Switch Wiring

Y

G

R

C

W

W G

1-STAGE LOW VOLTAGE ROOM

STAT WITH SUB-BASE SWITCHING

(BY OTHERS)

R C

W


STAT WITH NO SWITCHING

(BY OTHERS)

R C

TERMINAL STRIPON UNIT HEATERSUMMER/WINTER

SWITCH

(BY OTHERS)

WINTER

SUMMER

FAN OPERATION:SUMMER - CONTINUOUS FAN

WINTER - INTERMITTENT FAN ON A CALL FOR HEAT

FAN OPERATION (BASED ON FAN SUB-BASE SWITCH):SWITCH = ON - CONTINUOUS

SWITCH = AUTO - INTERMITTENT ON A CALL FOR HEAT

TERMINAL STRIPON UNIT HEATER

1-S

TA

GE

RO

OM

ST

AT

WIT

H S

UB

-BA

SE

FA

N S

WIT

CH

SU

MM

ER

/WIN

TE

R S

WIT

CH

& 1

-ST

AG

E R

OO

M S

TA

T

WIT

HO

UT

SU

B-B

AS

E F

AN

SW

ITC

H

Y

G

R

C

W

W G



(BY OTHERS)

R C



TERMINAL BOARDON UNIT HEATER

T2 F G

C VT1

MODELS HD/HDB, HDS/HDC, AND PTS/BTS MODEL PTC

W



(BY OTHERS)

R C


SUMMER/WINTER

SWITCH

(BY OTHERS)



T2 F G

C VT1

WINTER

SUMMER

Two Stage Thermostat & Summer/Winter Switch Wiring

G

W1

C

R

W2

W2 GW1



(BY OTHERS)

R C

G

W1

C

R

W2

W2W1

NOTE:

GENERIC ROOM STAT TERMINALS SHOWN. ACTUAL STAT MAY USE DIFFERENT TERMINALS AND/OR

WIRING. PLEASE CONSULT WIRING INSTRUCTIONS FOR STAT FOR PROPER WIRING.



(BY OTHERS)

R C


SUMMER/WINTER

SWITCH

(BY OTHERS)






2-S

TA

GE

RO

OM

ST

AT

WIT

H S

UB

-BA

SE

FA

N S

WIT

CH

SU

MM

ER

/WIN

TE

R S

WIT

CH

& 2

-ST

AG

E R

OO

M S

TA

TW

ITH

OU

T S

UB

-BA

SE

FA

N S

WIT

CH

MODELS HD/HDB, HDS/HDC, AND PTS/BTS

WINTER

SUMMER

Notes on Thermostat and Summer/Winter Switch Wiring: Units are equipped as standard with a controller that activates the unit fan in either of the following ways:

! On a call for heat (thermostat closure between R & W terminals (W1 for 2-stage units) on the unit heater terminal strip (T1 & T2 on the external terminal board for model PTC units). The control automatically recognizes a call for heat as requiring fan operation.

! With switch closure between R & G terminals on the unit heater terminal strip (T1 & G on the external terminal board for model PTC units). The control recognizes this as an override to the fan control based on a call for heat and starts the fan.

The diagrams on this page are arranged as follows:

1. Single stage thermostat with a Fan On/Auto switch for fan control.

2. Single stage thermostat without a Fan On/Auto switch and a Summer/Winter switch for fan control.

3. Two stage thermostat with a Fan On/Auto switch for fan control.

4. Two stage thermostat without a Fan On/Auto switch and a Summer/Winter switch for fan control.

Note: A Summer/Winter switch used on these models does NOT require a control relay as was required on previous models.

WIRING DIAGRAMS – ACCESSORIES

14 6-461.1

Wiring Multiple Single Stage Units to a Single Thermostat

DPDT CONTROLRELAY

(BY OTHERS)

Y

G

R

C

W

W

1-STAGE LOW VOLTAGE

ROOM STAT (NO SWITCHING)

(BY OTHERS)

R

TERMINAL STRIPON UNIT HEATER #1

MODELS HD/HDB, HDS/HDC, AND PTS/BTS MODEL PTC

2 4 3

6 8 7

0

2 4 3

6 8 7

1

Y

G

R

C

W

TERMINAL STRIPON UNIT HEATER #2

2 4 3

6 8 7

0

2 4 3

6 8 7

1

W

1-STAGE LOW VOLTAGE

ROOM STAT (NO SWITCHING)

(BY OTHERS)

R

2 4 3

6 8 7

0

2 4 3

6 8 7

1

2 4 3

6 8 7

0

2 4 3

6 8 7

1

T2 F G

C VT1

T2 F G

C VT1

DPDT CONTROLRELAY

(BY OTHERS)

DPDT CONTROLRELAY

(BY OTHERS)

DPDT CONTROLRELAY

(BY OTHERS)

TERMINAL BOARDON UNIT HEATER #1

TERMINAL BOARDON UNIT HEATER #2

TO ADDITIONALUNIT/RELAY PAIRINGS

(IF APPLICABLE)

TO ADDITIONALUNIT/RELAY PAIRINGS

(IF APPLICABLE)

Notes on Wiring Multiple Single Stage Units to a Single Thermostat When two or more unit heaters are controlled by one thermostat, it is necessary to electrically isolate each unit by using relays. If relays are not used, feedback in the low voltage circuits can occur. This feedback may cause operational problems, damage the electrical components in the low voltage circuit, or cause burnout of the low voltage transformers.

The figure above shows that the thermostat, powered from the terminal strip of unit heater #1 (UH-1), energizes the relay coil of the first relay (RE-1). When the RE-1 coil is energized, the first set of normally open (NO) contacts of that DPDT relay close and activate the gas controls of UH-1. The second set of normally open (NO) contacts on RE-1 are used to energize the relay coil of the second relay RE-2, powered through the terminal strip of UH-2. The first set of NO contacts on RE-2 close and activate the gas controls of UH-2. If a third unit is to be controlled from the same thermostat, a third relay RE-3 coil is wired to the second set of contacts on RE-2. This procedure is repeated for each additional unit which is to be controlled by the thermostat. Generally, there should be a quantity of DPDT relays that is one less than the quantity of heaters to be controlled.

Accessory Wiring for Model PTC Units

NOTE:FOR FIELD WIRED CONDENSATE PUMP AUX SWITCH AND/OR CONDENSATE DRAINLINE SAFETY OVERFLOW SWITCH, REMOVE TERMINAL BOARD JUMPERS AS FOLLOWS:

-FOR ONE ACCESSORY, REMOVE "T1" TO "C" JUMPER -FOR TWO ACCESSORIES, REMOVE "T1" TO "C" & "C" TO "V" JUMPERS

FOR FURTHER INSTRUCTIONS, REFER TO THE LATEST REVISION OF INSTALLATIONINSTRUCTIONS 6-585 FOR THE CONDENSATE PUMP AND/OR 6-586 FOR THECONDENSATE DRAIN LINE SAFETY OVERFLOW SWITCH.


T2 F G

C VT1

ACCESSORYACCESSORY

SEE NOTE BELOWFOR REMOVAL OF

JUMPER BARS

6-461.1 15

THIS PAGE INTENTIONALLY LEFT BLANK

Commercial Products Group ! Modine Manufacturing Company ! 1500 DeKoven Avenue ! Racine, Wisconsin, USA 53403-2552

Phone: 1.800.828.4328 (HEAT) ! www.modine.com © Modine Manufacturing Company 2009 6-461.1 09/09 Litho in USA

Documents

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