modine hot dawg® heater wiring diagram - qc supply

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

Prop

elle

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

wer

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

BLO

WER

MO

TOR

P1-

7

* IN

TEG

RA

TED

CO

NTR

OL

115V

IND

UC

ERM

OTO

RS

PA

RK

IGN

ITO

R

24V

MV

P1-

9P

1-2

PRESSURE

P1-

5P

1-3

SE

C

P1-

6

CO

M

P1-

4

FLAMESENSOR

GASVALVE

ROLLOUT

HIGH LIMIT

THERMOSTAT

L1IN

D

P1-

8W

GN

D

L1L2

CALL FOR HEAT

ROLLOUT

NTR

LN

TRL

NTR

L

NTR

L

L1

EAC

R

FUSE

C

115V

/60H

Z/1Ø

CIR

CU

ITB

REA

KER

(BY

OTH

ER

S) HIGH LIMIT

REF

ERN

OTE

7

115V

Uni

t Pow

er

IND

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RD

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, DIR

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24V

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ITH

UN

ITE

D T

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NO

LOG

IES

LAB

EL, S

EE

CH

AR

T FO

R O

THE

R L

ABEL

S

14

7 85

2 36

9

G W R CY

GN

D

O

WH

CO

M

L1, (

BK

)

R

YP

IN 6

120

R

CO

M24

R

FAN

MO

TOR

Y

WH

BK

SE

C

PIN

5Y

XFM

R

PR

ESS

UR

ES

WIT

CH

PE

MO

TOR

LOW

VO

LTA

GE

THE

RM

OS

TAT

(BY

OTH

ER

S)

LIM

ITC

ON

TRO

LGA

SV

ALV

E11

5V/6

0HZ/

1Ø P

OW

ER

CIR

CU

IT B

RE

AK

ER

(BY

OTH

ER

S)

FLA

ME

SE

NS

OR

BL

GR

, (G

)

BK

L2, (WH)

L2, (

WH

)

N E U T R A L

INDL1L1

EA

C

PA

RK

HO

NE

YWE

LLLA

BE

L

SP

AR

KIG

NIT

OR

UT

LAB

EL

IGN

ITIO

NC

ON

TRO

L

CO

M24

VA

CN E U T R A L

IND

XFM

RL1

EA

C/B

LOM1

PA

RK

CO

OL

5H07

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B1

RE

V L

LIM

IT C

ON

TRO

L(S

EE

NO

TE 5

)

L1, (BK)

SW

ITC

HRE

FER

NO

TE 7

FLA

ME

RO

LLO

UTS

(SE

E N

OTE

6)

5H07

9963

B1

WIR

ING

DIA

GR

AM

, SIN

GLE

STA

GE

NO

TES

TO

INS

TALL

ER

:

1. A

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G M

UST

CO

MP

LY W

ITH

NAT

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AL

ELE

CTR

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OD

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OC

AL C

OD

ES.

2. A

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OM

PON

ENTS

MU

ST A

GR

EE W

ITH

T

HE

IR R

ESP

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PO

WER

SO

UR

CE

.

3. V

ERIF

Y TH

E P

OW

ER S

OU

RC

E AN

D

TH

E U

NIT

PO

LAR

ITY.

4. U

SE

TYP

E 1

05°C

REP

LAC

EMEN

T W

IRE

3

00V

OR

GR

EAT

ER.

5. U

SED

ON

PR

OPE

LLE

R M

OD

ELS

100

AND

LAR

GER

.

6. T

WO

SW

ITC

HES

: 30-

75, O

NE

SW

ITC

H: 1

00-1

25

NO

T U

SED

ON

150

-400

UN

ITS.

7. O

PTIO

NA

L U

NIT

DIS

CO

NN

ECT

SWIT

CH

.

CAU

TIO

N:

FAIL

UR

E TO

WIR

E T

HIS

UN

IT A

CC

OR

DIN

GTO

TH

IS W

IRIN

G D

IAG

RA

M M

AY R

ESU

LTIN

INJU

RY

TO T

HE

INST

ALL

ER

OR

US

ER.

FOR

DEV

IATI

ON

S C

ON

TAC

T TH

E FA

CTO

RY.

FOR

BLO

WER

MO

TOR

S,

WH

-NEU

TRAL

BK-

HI

BL-

MED

RED

-LO

ATTA

CH

WIR

ES

NO

T U

SED

TO "P

ARK

" TER

MIN

ALS


4 6-461.1

5H07

9963

B2

BLO

WER

MO

TOR

CO

M

* IN

TEG

RAT

EDC

ON

TRO

L

115V

IND

UC

ERM

OTO

R

SPA

RK

IGN

ITO

R

P3P7

P2G

W1

P4

FLAMESENSOR

LOFIRE

W1

HIGH LIMIT

RP6

GN

D

L1L2

ROLLOUT

IND

FSP8

115V

/60H

Z/1Ø

CIR

CU

ITBR

EAKE

R(B

Y O

THER

S)

W2

P9

24V

24V

HI

IND

HEA

T

L1

HIFIRE

WH

ITE

RO

GE

RS

GA

S V

ALV

E

ROLLOUT

CALL FORHEAT

PR

ES

SU

RE

SWIT

CH

W2

T-S

TAT

HI

CO

MM

HO

NE

YWE

LLG

AS

VA

LVE

HI

LOC

OM

HIGH LIMIT

115V

Uni

t Pow

er

REF

ERN

OTE

7

IND

ICAT

ES T

ERM

INAL

BOA

RD

CO

NN

ECTI

ON

TWO

STA

GE,

DIR

ECT

SPA

RK

IGN

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N,

100%

SH

UT-

OFF

, MU

LTIP

LE R

ETR

Y W

/ AU

TO R

ESE

T FR

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CKO

UT

WIR

ING

LEG

END

FAC

TOR

Y W

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GIN

TER

NAL

CO

MPO

NEN

T W

IRIN

GFI

ELD

WIR

ING

WIR

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UT

LIN

E

24V

14

7 85

2 36

9

G W1 C RY

GN

D

O

WH

CO

M

L1, (

BK

)

R

Y12

0

R

CO

M24

R

FAN

MO

TOR

Y

WH BK

24V

PIN

8Y

XFM

R

PR

ESS

UR

ES

WIT

CH

PE

MO

TOR

CA

LL F

OR

FA

N

LIM

ITC

ON

TRO

L

CO

M11

5V/6

0HZ/

1Ø P

OW

ER

CIR

CU

IT B

RE

AK

ER

(BY

OTH

ER

S)

FLA

ME

SE

NS

OR

BL

BK

L2, (WH)

L2, (

WH

)

FSL1

HE

AT

PA

RKS

PA

RK

IGN

ITO

R

UT

LAB

EL

IGN

ITIO

NC

ON

TRO

L

PA

RK

FLA

ME

RO

LLO

UTS

(SE

E N

OTE

6)

IND

WH

ITE

RO

GE

RS

GA

S V

ALV

EC

OM

HI

M

W2

LOW

VO

LTA

GE

THE

RM

OS

TAT

(BY

OTH

ER

S)

1ST

STA

GE

2ND

STA

GE

CO

M

HO

NE

YW

ELL

GA

S V

ALV

E

HI

LO

LIM

IT C

ON

TRO

L(S

EE

NO

TE 5

)

L1, (BK)

SWIT

CH

REFE

R NO

TE 7

115V

Uni

t Pow

er

WIR

ING

DIA

GR

AM

, TW

O S

TAG

E

NO

TES

TO

INS

TALL

ER:

1. A

LL W

IRIN

G M

UST

CO

MP

LY W

ITH

NAT

ION

AL

ELE

CTR

IC C

OD

E AN

D A

LL L

OC

AL

CO

DES

.

2. A

LL C

OM

PON

ENTS

MU

ST A

GR

EE W

ITH

T

HEI

R R

ESPE

CTI

VE P

OW

ER S

OU

RC

E.

3. V

ERIF

Y TH

E P

OW

ER S

OU

RC

E AN

D

TH

E U

NIT

PO

LAR

ITY.

4. U

SE T

YPE

105°

C R

EPLA

CEM

ENT

WIR

E

300

V O

R G

RE

ATER

.

5. U

SED

ON

PR

OPE

LLER

MO

DEL

S 10

0 AN

D L

AR

GER

.

6. T

WO

SW

ITC

HES

: 30-

75, O

NE

SW

ITC

H: 1

00-1

25

NO

T U

SED

ON

150

-400

UN

ITS.

7. O

PTIO

NAL

UN

IT D

ISC

ON

NEC

T SW

ITC

H.

CAU

TIO

N:

FAIL

UR

E TO

WIR

E T

HIS

UN

IT A

CC

OR

DIN

GTO

TH

IS W

IRIN

G D

IAG

RA

M M

AY R

ESU

LTIN

INJU

RY

TO T

HE

INST

ALL

ER

OR

US

ER.

FOR

DEV

IATI

ON

S C

ON

TAC

T TH

E FA

CTO

RY.

MO

TOR

LE

AD C

OLO

R F

OR

DIR

ECT

DR

IVE

BLO

WE

R M

OTO

RS

ON

LY.

W

H-N

EUTR

AL

BK-

HI

B

L-M

ED

RED

-LO

ATTA

CH

WIR

ES N

OT

USE

DTO

"PAR

K" T

ERM

INAL

S

UN

ITS

ARE

FAC

TOR

Y W

IRED

FOR

HIG

H S

PEE

D O

PER

ATIO

N.


6-461.1 5

14

7 85

2 36

9

G W R CY

GN

D

O

WH

CO

M

L1, (

BK)

R

YP

IN 6

120

R

CO

M24

R

FAN

MO

TOR

Y

WH

BKSE

C

PIN

5Y

XFM

R

PR

ESS

UR

ESW

ITC

H

PE

MO

TOR

LOW

VO

LTAG

ETH

ER

MO

STA

T(B

Y O

THER

S)

LIM

IT

GA

SVA

LVE

115V

/60H

Z/1Ø

UNIT

PO

WER

CIRC

UIT

BRE

AKER

(B

Y O

THER

S)FL

AM

ESE

NSO

R

BL

BK

L2, (WH)

L2, (

WH

)

N E U T R A L

INDL1L1

EAC

PAR

K

HO

NE

YWEL

LLA

BEL

SPA

RK

IGN

ITO

R

UT

LABE

L

IGN

ITIO

NC

ON

TRO

L

CO

M24

VAC

N E U T R A L

IND

XFM

RL1

EAC

/BLOM

1

PAR

KC

OO

L

LIM

ITC

ON

TRO

L

L1, (BK)

SWIT

CH

REF

ERN

OTE

6

10

68

7

24

3

115V

Uni

t Pow

er

5H07

9963

B3

WIR

ING

DIA

GR

AM

, SIN

GLE

STA

GE,

REL

AY

IND

ICAT

ES T

ERM

INAL

BOA

RD

CO

NN

ECTI

ON

WIR

ING

LEG

END

FAC

TOR

Y W

IRIN

GIN

TER

NAL

CO

MPO

NEN

T W

IRIN

GFI

ELD

WIR

ING

WIR

E N

UT

LIN

E

24V

FAN

MO

TOR

P1-7

* IN

TEG

RA

TED

CO

NTR

OL

115V

PE

MO

TOR

SPAR

KIG

NIT

OR

24V

MV

P1-9

P1-2

PRESSURE

P1-5

P1-3

SEC

P1-6

CO

M

P1-4

FLAMESENSOR

GASVALVE

HIGH LIMIT

THERMOSTAT

L1IN

D

P1-8

W

GN

D

L1L2

CALL FOR HEAT

NTR

LN

TRL

NTR

L

NTR

L

L1

EAC

R

FUSE

C

115V

/60H

Z/1Ø

UN

IT C

IRC

UIT

CIR

CU

IT B

REA

KER

(BY

OTH

ERS

)

HIGH LIMIT

0 1

34

2 68

7

115V

Uni

t Pow

er

See

note

#6

for m

otor

conn

ectio

ns

RE

FER

NO

TE 7

SIN

GLE

STA

GE

, DIR

ECT

SPAR

K IG

NIT

ION

,10

0% S

HU

T-O

FF, M

ULT

IPLE

RET

RY

W/ A

UTO

RE

SET

FR

OM

LO

CK

OU

T

NO

TES

TO

INS

TALL

ER:

1. A

LL W

IRIN

G M

UST

CO

MP

LY W

ITH

NAT

ION

AL

ELE

CTR

IC C

OD

E AN

D A

LL L

OC

AL

CO

DES

.

2. A

LL C

OM

PON

ENTS

MU

ST A

GR

EE W

ITH

T

HEI

R R

ESPE

CTI

VE P

OW

ER S

OU

RC

E.

3. V

ERIF

Y TH

E P

OW

ER S

OU

RC

E AN

D

TH

E U

NIT

PO

LAR

ITY.

4. U

SE T

YPE

105°

C R

EPLA

CEM

ENT

WIR

E

300

V O

R G

RE

ATER

.

5. U

SED

ON

PR

OPE

LLER

MO

DEL

S 10

0 AN

D L

AR

GER

.

6. O

PTIO

NA

L U

NIT

DIS

CO

NN

ECT

SW

ITC

H.

CAU

TIO

N:

FAIL

UR

E TO

WIR

E T

HIS

UN

IT A

CC

OR

DIN

GTO

TH

IS W

IRIN

G D

IAG

RA

M M

AY R

ESU

LTIN

INJU

RY

TO T

HE

INST

ALL

ER

OR

US

ER.

FOR

DEV

IATI

ON

S C

ON

TAC

T TH

E FA

CTO

RY.

FOR

BLO

WER

MO

TOR

S,

WH

-NEU

TRAL

BK-

HI

BL-

MED

RED

-LO

ATTA

CH

WIR

ES

NO

T U

SED

TO "P

ARK

" TER

MIN

ALS


6 6-461.1

5H07

9963

B4

WIR

ING

DIA

GR

AM

, TW

O S

TAG

E, R

ELA

Y

IND

ICAT

ES T

ERM

INAL

BOA

RD

CO

NN

ECTI

ON

WIR

ING

LEG

END

FAC

TOR

Y W

IRIN

GIN

TER

NAL

CO

MPO

NEN

T W

IRIN

GFI

ELD

WIR

ING

WIR

E N

UT

LIN

E

24V

TWO

STA

GE,

DIR

ECT

SPA

RK

IGN

ITIO

N,

100%

SH

UT-

OFF

, MU

LTIP

LE R

ETR

Y W

/ AU

TO R

ESE

T FR

OM

LO

CKO

UT

14

7 85

2 36

9

G W1 C RY

O

WH

CO

M

R

Y12

0

R

CO

M24

R

FAN

MO

TOR

Y

WH BK

24V

PIN

8Y

XFM

R

PRE

SSU

RE

SWIT

CH

PEM

OTO

R

CAL

L FO

R F

AN

LIM

ITC

ON

TRO

L

CO

MFL

AM

ESE

NSO

R

BL

BK

L2, (WH)

FSL1

HEA

T

PAR

KSPAR

KIG

NIT

OR

UT

LAB

EL

IGN

ITIO

NC

ON

TRO

L

PAR

K

IND

WH

ITE

RO

GER

SG

AS

VALV

EC

OM

HI

M

W2

LOW

VO

LTA

GE

THER

MO

STA

T(B

Y O

THER

S)

1ST

STA

GE

2ND

STA

GE

CO

M

HO

NE

YW

ELL

GAS

VA

LVE

HI

LO

LIM

IT C

ON

TRO

L(S

EE N

OTE

5)

10

68

7

24

3

GN

D

L1, (

BK)

115V

/60H

Z/1Ø

UN

IT P

OW

ERC

IRC

UIT

BR

EAK

ER

(BY

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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/WINTERSWITCH

(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/ORWIRING. PLEASE CONSULT WIRING INSTRUCTIONS FOR STAT FOR PROPER WIRING.


(BY OTHERS)R C


SUMMER/WINTERSWITCH

(BY OTHERS)




2-S

TAG

E R

OO

M S

TAT

WIT

H S

UB

-BAS

E FA

N S

WIT

CH

SUM

MER

/WIN

TER

SW

ITC

H &

2-S

TAG

E R

OO

M S

TAT

WIT

HO

UT

SU

B-B

ASE

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 VOLTAGEROOM 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

02 4 36 8 7

1

Y

G

R

C

W

TERMINAL STRIPON UNIT HEATER #2

2 4 3

6 8 7

02 4 36 8 7

1

W

1-STAGE LOW VOLTAGEROOM STAT (NO SWITCHING)

(BY OTHERS)R

2 4 3

6 8 7

02 4 36 8 7

1

2 4 3

6 8 7

02 4 36 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

modine hot dawg® heater wiring diagram - qc supply

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