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
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.
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
H1, H2, etc.
X1, X2, etc.
V
Hz
ø
RC
G
H
SW
HI
LO
C
“J” Box
S/W
O.L.C.
SPDT
DPDT
VA
L1, L2, L3
T1, T2, T3
Transformer
Transformer Primary Terminals
Transformer Secondary Terminals
Volts
Hertz
Phase
Relay Contactor Coil
Ground
Hot
Switch
High
Low
Common
Junction Box
Summer/Winter Switch
Overload Contacts
Single Pole Double Throw Switch
Double Pole Double Throw Switch
Volt-Ampere
Load Terminals (Connect to Supply Voltage)
Motor or Motor Starter Terminals
Wire Color Coding
BK
Black
BR
Brown
BL
Blue
R
Red
W
White
GY
Gray
Y
Yellow
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.
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.
WIRING DIAGRAM SELECTION
Select the correct wiring diagram as follows:
1.
2.
Determine the 12 digit unit heater model number. Example: PTS350SS0122
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
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.
Review Table 2.2 to determine if any additional wiring diagrams are necessary based on accessories included.
3.
4.
Table 2.1 – Unit Heater Wiring Diagram Page Location Index
Propeller
Type
Model
Size
Power Code
Supply Voltage
HD/HDS
30-125
01 c
115V/1ph
150-350
PTC
HDB/HDC
Blower
01 c
115V/1ph
PTS
Control
Code
11 or 21
Single Stage
Wiring
Diagram
5H079963B1
12 or 22
Two Stage
5H079963B2
4
11 or 21
Single Stage
5H079963B1
3
Gas Controls
Page
3
12 or 22
Two Stage
5H079963B2
4
11 or 21
Single Stage
5H079963B3
5
400
01 c
115V/1ph
12 or 22
Two Stage
5H079963B4
6
135-215
01 c
115V/1ph
11 or 21
Single Stage
5H080716B1
11
260-310
01 c
115V/1ph
11 or 21
Single Stage
5H080716B2
12
11 or 21
Single Stage
5H079963B1
3
12 or 22
Two Stage
5H079963B2
4
11 or 21
Single Stage
5H079963B1
3
12 or 22
Two Stage
5H079963B2
4
11 or 21
Single Stage
5H080273B1
7
12 or 22
Two Stage
5H080273B2
60-125
150
BTS
01 d
115V/1ph
01 d
115V/1ph
02, 13, 24,35 d
115/230V/1ph
8
08, 11, 19, 22, 30, 33, 38,
11 or 21
Single Stage
5H080274B1
9
41, 42, 44, 49, 53, 55, 60, 208/230/460/575V/3ph
12 or 22
Two Stage
5H080274B2
10
64, 66, 71, 75, 77 d
c 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.
150-400
d 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
2
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
6-461.1
6-461.1
C
R
W
G
Y
R
WH
FLAME ROLLOUTS
(SEE NOTE 6)
1 4 7
2 5 8
3 6 9
BL
R
SEC
COM
COM
N
E
U
T
R
A
L
N
E
U
T
R
A
L
24VAC
L1
L1
L1
IND
EAC
EAC/BLO
IND
PARK
XFMR
PARK
M1
UT
LABEL
COOL
HONEYWELL
LABEL
L2, (WH)
R
Y
L1, (BK)
BK
WH
SWITCH
CAUTION:
FAILURE TO WIRE THIS UNIT ACCORDING
TO THIS WIRING DIAGRAM MAY RESULT
IN INJURY TO THE INSTALLER OR USER.
FOR DEVIATIONS CONTACT THE FACTORY.
3. VERIFY THE POWER SOURCE AND
THE UNIT POLARITY.
ATTACH WIRES NOT USED
TO "PARK" TERMINALS
P1-8
P1-3
P1-6
P1-5
P1-4
NTRL
P1-9
NTRL
P1-2
MV
C
NTRL
R
P1-7
24V
COM
SEC
115V
L1
NTRL
6. TWO SWITCHES: 30-75, ONE SWITCH: 100-125
NOT USED ON 150-400 UNITS.
WIRING DIAGRAM, SINGLE STAGE
W
* INTEGRATED
CONTROL
EAC
SPARK
IGNITOR
7. OPTIONAL UNIT DISCONNECT SWITCH.
5H079963B1 REV L
XFMR
IND
BLOWER
MOTOR
GND
115V Unit Power
5H079963B1
COM
FAN
MOTOR
L1
INDUCER
MOTOR
REFER
NOTE 7
*SHOWN WITH UNITED TECHNOLOGIES
LABEL, SEE CHART FOR OTHER LABELS
5. USED ON PROPELLER MODELS 100 AND LARGER.
4. USE TYPE 105°C REPLACEMENT WIRE
300V OR GREATER.
2. ALL COMPONENTS MUST AGREE WITH
THEIR RESPECTIVE POWER SOURCE.
WH-NEUTRAL
BK-HI
BL-MED
RED-LO
24
120
PE
MOTOR
REFER NOTE 7
1. ALL WIRING MUST COMPLY WITH NATIONAL
ELECTRIC CODE AND ALL LOCAL CODES.
NOTES TO INSTALLER:
SINGLE STAGE, DIRECT SPARK IGNITION,
100% SHUT-OFF, MULTIPLE RETRY W/ AUTO RESET FROM LOCKOUT
LIMIT CONTROL
(SEE NOTE 5)
Y
PIN 6
PIN 5
Y
FOR BLOWER MOTORS,
LIMIT
CONTROL
PRESSURE
SWITCH
LOW VOLTAGE
THERMOSTAT
(BY OTHERS)
O
IGNITION
CONTROL
SPARK
IGNITOR
115V/60HZ/1Ø POWER
CIRCUIT BREAKER (BY OTHERS)
CALL FOR HEAT
L2, (WH)
L1, (BK)
THERMOSTAT
GR, (G)
ROLLOUT
GND
HIGH LIMIT
FLAME
SENSOR
ROLLOUT
GAS
VALVE
BK
115V/60HZ/1Ø
L1 L2
CIRCUIT
BREAKER
(BY OTHERS)
PRESSURE
INDICATES TERMINAL
BOARD CONNECTION
HIGH LIMIT
24V
GAS
VALVE
LINE
FUSE
WIRING LEGEND
FLAME
SENSOR
FACTORY WIRING
INTERNAL COMPONENT WIRING
FIELD WIRING
WIRE NUT
WIRING DIAGRAMS – MODELS HD/HDB, HDS/HDC, PTS/BTS
3
6-461.1
LIMIT CONTROL
(SEE NOTE 5)
R
FLAME ROLLOUTS
(SEE NOTE 6)
CAUTION:
FAILURE TO WIRE THIS UNIT ACCORDING
TO THIS WIRING DIAGRAM MAY RESULT
IN INJURY TO THE INSTALLER OR USER.
FOR DEVIATIONS CONTACT THE FACTORY.
UNITS ARE FACTORY WIRED
FOR HIGH SPEED OPERATION.
ATTACH WIRES NOT USED
TO "PARK" TERMINALS
WH-NEUTRAL
BK-HI
BL-MED
RED-LO
R
COM
24V
FS
IND
L1
C
R
HEAT
W2
UT
LABEL
PARK
O
PARK
1 4 7
2 5 8
3 6 9
BL
IGNITION
CONTROL
SPARK
IGNITOR
FLAME
SENSOR
G
WH
HI
L2, (WH)
BK
Y
BK
WH
SWITCH
7. OPTIONAL UNIT DISCONNECT SWITCH.
6. TWO SWITCHES: 30-75, ONE SWITCH: 100-125
NOT USED ON 150-400 UNITS.
5. USED ON PROPELLER MODELS 100 AND LARGER.
4. USE TYPE 105°C REPLACEMENT WIRE
300V OR GREATER.
3. VERIFY THE POWER SOURCE AND
THE UNIT POLARITY.
2. ALL COMPONENTS MUST AGREE WITH
THEIR RESPECTIVE POWER SOURCE.
24
120
PE
MOTOR
REFER NOTE 7
COM
XFMR
FAN
MOTOR
GND
115V/60HZ/1Ø POWER
L2, (WH) CIRCUIT BREAKER (BY OTHERS)
L1, (BK)
1. ALL WIRING MUST COMPLY WITH NATIONAL
ELECTRIC CODE AND ALL LOCAL CODES.
NOTES TO INSTALLER:
L1, (BK)
R
TWO STAGE, DIRECT SPARK IGNITION,
100% SHUT-OFF, MULTIPLE RETRY W/ AUTO RESET FROM LOCKOUT
Y
LO
COM
W1
Y
HONEYWELL
GAS VALVE
MOTOR LEAD COLOR FOR DIRECT
DRIVE BLOWER MOTORS ONLY.
LIMIT
CONTROL
PRESSURE
SWITCH
PIN 8
Y
HI
LOW VOLTAGE
THERMOSTAT
(BY OTHERS)
CALL FOR FAN
1ST STAGE
2ND STAGE
M
COM COM
WHITE ROGERS
GAS VALVE
P6
P9
R
INDUCER
MOTOR
G
IND
L1 L2
W2
HEAT
T-STAT
W1
24V
115V
BLOWER
MOTOR
P2
GND
P4
P7
HI
M
COM
LO
HONEYWELL
GAS VALVE
FS
WIRING DIAGRAM, TWO STAGE
HI
WHITE ROGERS
GAS VALVE
COM
P8
PRESSURE
SWITCH
P3
* INTEGRATED
CONTROL
COM
SPARK
IGNITOR
115V Unit Power
5H079963B2
24V
L1
HI
IND
REFER
NOTE 7
ROLL
OUT
ROLL
OUT
115V Unit Power
HIGH LIMIT
115V/60HZ/1Ø
CIRCUIT
BREAKER
(BY OTHERS)
W2
INDICATES TERMINAL
BOARD CONNECTION
W1
24V
CALL FOR
HEAT
HIGH LIMIT
LO
FIRE
LINE
HI
FIRE
WIRING LEGEND
FLAME
SENSOR
4
FACTORY WIRING
INTERNAL COMPONENT WIRING
FIELD WIRING
WIRE NUT
WIRING DIAGRAMS – MODELS HD/HDB, HDS/HDC, PTS/BTS
6-461.1
C
R
W
1 4 7
2 5 8
3 6 9
R
SEC
COM
COM
N
E
U
T
R
A
L
24VAC
L1
IND
N
E
U
T
R
A
L
L1
L1
IND
EAC
XFMR
PARK
COOL
PARK
UT
LABEL
EAC/BLO
M1
HONEYWELL
LABEL
SWITCH
REFER
NOTE 6
L2, (WH)
L1, (BK)
R
Y
BK
WH
PE
MOTOR
L2, (WH)
COM
0
6. OPTIONAL UNIT DISCONNECT SWITCH.
5. USED ON PROPELLER MODELS 100 AND LARGER.
4. USE TYPE 105°C REPLACEMENT WIRE
300V OR GREATER.
3. VERIFY THE POWER SOURCE AND
THE UNIT POLARITY.
2. ALL COMPONENTS MUST AGREE WITH
THEIR RESPECTIVE POWER SOURCE.
1. ALL WIRING MUST COMPLY WITH NATIONAL
ELECTRIC CODE AND ALL LOCAL CODES.
NOTES TO INSTALLER:
24
120
1
XFMR
FAN
MOTOR
3 4 2
7 86
115V/60HZ/1Ø
UNIT POWER
CIRCUIT BREAKER
(BY OTHERS)
SINGLE STAGE, DIRECT SPARK IGNITION,
100% SHUT-OFF, MULTIPLE RETRY W/ AUTO RESET FROM LOCKOUT
R
WH
CAUTION:
FAILURE TO WIRE THIS UNIT ACCORDING
TO THIS WIRING DIAGRAM MAY RESULT
IN INJURY TO THE INSTALLER OR USER.
FOR DEVIATIONS CONTACT THE FACTORY.
ATTACH WIRES NOT USED
TO "PARK" TERMINALS
WH-NEUTRAL
BK-HI
BL-MED
RED-LO
Y
G
LIMIT CONTROL
Y
PIN 6
PIN 5
Y
FOR BLOWER MOTORS,
LIMIT
PRESSURE
SWITCH
LOW VOLTAGE
THERMOSTAT
(BY OTHERS)
BL
O
IGNITION
CONTROL
SPARK
IGNITOR
FLAME
SENSOR
BK
L1, (BK)
See note #6
for motor
connections
8
6
FAN
MOTOR
4
2
7
3
1
0
EAC
P1-8
P1-3
P1-6
P1-5
* INTEGRATED
CONTROL
IND
P1-4
MV
NTRL
P1-9
NTRL
P1-2
C
NTRL
R
FUSE
P1-7
24V
COM
SEC
115V
SPARK
IGNITOR
115V/60HZ/1Ø
UNIT CIRCUIT
CIRCUIT BREAKER
(BY OTHERS)
L1
NTRL
GND
L2
L1
WIRING DIAGRAM, SINGLE STAGE, RELAY
5H079963B3
W
L1
PE
MOTOR
REFER NOTE 7
115V Unit Power
THERMOSTAT
GND
HIGH LIMIT
115V Unit Power
CALL FOR HEAT
INDICATES TERMINAL
BOARD CONNECTION
HIGH LIMIT
GAS
VALVE
24V
PRESSURE
LINE
GAS
VALVE
WIRING LEGEND
FLAME
SENSOR
FACTORY WIRING
INTERNAL COMPONENT WIRING
FIELD WIRING
WIRE NUT
WIRING DIAGRAMS – MODELS HD/HDB, HDS/HDC, PTS/BTS
5
6-461.1
Y
R
COM
24V
FS
REFER
NOTE 6
SWITCH
L2, (WH)
L1, (BK)
R
Y
BK
WH
PE
MOTOR
24
120
6. OPTIONAL UNIT DISCONNECT SWITCH.
5. USED ON PROPELLER MODELS 100 AND LARGER.
4. USE TYPE 105°C REPLACEMENT WIRE
300V OR GREATER.
3. VERIFY THE POWER SOURCE AND
THE UNIT POLARITY.
2. ALL COMPONENTS MUST AGREE WITH
THEIR RESPECTIVE POWER SOURCE.
0
COM
1
XFMR
FAN
MOTOR
3 4 2
7 86
115V/60HZ/1Ø
UNIT POWER
CIRCUIT BREAKER
(BY OTHERS)
1. ALL WIRING MUST COMPLY WITH NATIONAL
ELECTRIC CODE AND ALL LOCAL CODES.
NOTES TO INSTALLER:
GND
L1, (BK)
L2, (WH)
TWO STAGE, DIRECT SPARK IGNITION,
100% SHUT-OFF, MULTIPLE RETRY W/ AUTO RESET FROM LOCKOUT
LIMIT CONTROL
(SEE NOTE 5)
R
L1
C
IND
HEAT
R
PARK
UT
LABEL
PARK
O
G
1 4 7
2 5 8
3 6 9
BL
W1
WH
IGNITION
CONTROL
SPARK
IGNITOR
FLAME
SENSOR
W2
Y
HI
COM
115V Unit Power
CAUTION:
FAILURE TO WIRE THIS UNIT ACCORDING
TO THIS WIRING DIAGRAM MAY RESULT
IN INJURY TO THE INSTALLER OR USER.
FOR DEVIATIONS CONTACT THE FACTORY.
LIMIT
CONTROL
PRESSURE
SWITCH
PIN 8
Y
HI
LOW VOLTAGE
THERMOSTAT
(BY OTHERS)
CALL FOR FAN
1ST STAGE
2ND STAGE
M
COM COM
LO
BK
HONEYWELL
GAS VALVE
GND
GND
L1
L2
REFER
NOTE 7
115V/60HZ/1Ø
UNIT POWER
CIRCUIT BREAKER
(BY OTHERS)
GND
24V
P6
L1
P9
IND
R
G
W2
T-STAT
W1
P2
* INTEGRATED
CONTROL
P4
P7
HEAT
HI
HI
M
LO
HONEYWELL
GAS VALVE
COM
P8
PRESSURE
SWITCH
P3
WHITE ROGERS
GAS VALVE
COM
FS
COM
SPARK
IGNITOR
0
1
4
3
GND
2
6
See note #6
for motor
connections
FAN
MOTOR
8
7
WIRING DIAGRAM, TWO STAGE, RELAY
5H079963B4
24V
115V
PE
MOTOR
115V Unit Power
HIGH LIMIT
WHITE ROGERS
GAS VALVE
W2
INDICATES TERMINAL
BOARD CONNECTION
W1
24V
CALL FOR
HEAT
HIGH LIMIT
LO
FIRE
LINE
HI
FIRE
WIRING LEGEND
FLAME
SENSOR
6
FACTORY WIRING
INTERNAL COMPONENT WIRING
FIELD WIRING
WIRE NUT
WIRING DIAGRAMS – MODELS HD/HDB, HDS/HDC, PTS/BTS
C
R
W
LIMIT CONTROL
(SEE NOTE 5)
Y
PIN 6
PIN 5
Y
Y
G
R
WH
LIMIT
CONTROL
PRESSURE
SWITCH
LOW VOLTAGE
THERMOSTAT
(BY OTHERS)
GAS
VALVE
C
R
W
LIMIT CONTROL
(SEE NOTE 5)
Y
PIN 6
PIN 5
Y
Y
G
R
WH
O
R
IND
N
E
U
T
R
A
L
IND
N
E
U
T
R
A
L
SEC
L1
COM
L1
COM
EAC
L1
XFMR
24VAC
PARK
COOL
PARK
UT
LABEL
EAC/BLO
M1
HONEYWELL
LABEL
REFER
NOTE 7
SWITCH
L1, (BK)
1 4 7
2 5 8
3 6 9
BL
O
R
SEC
COM
COM
N
E
U
T
R
A
L
N
E
U
T
R
A
L
24VAC
L1
L1
IND
L1
IND
EAC
XFMR
PARK
COOL
PARK
UT
LABEL
EAC/BLO
M1
HONEYWELL
LABEL
IGNITION
CONTROL
SPARK
IGNITOR
FLAME
SENSOR
L2, (WH)
Y
230V/60HZ/1Ø
FAN CIRCUIT POWER
CIRCUIT BREAKERS
(BY OTHERS)
CONTROL CIRCUIT MUST BE 115V POWER
230V Fan/Blower Power Only
1 4 7
2 5 8
3 6 9
>Disconnect relay power leads (#2 & #6) from 115V
supply and connect 230V as shown.
>All other unit power must be 115V as shown.
>See note #6 for motor connections.
LIMIT
CONTROL
PRESSURE
SWITCH
LOW VOLTAGE
THERMOSTAT
(BY OTHERS)
BL
IGNITION
CONTROL
SPARK
IGNITOR
FLAME
SENSOR
R
24
120
BK
WH
PE
MOTOR
COM
0
XFMR
See note #6
for motor
connections
FAN
MOTOR
3 4 2
7 8 6
XFMR
See note #6
for motor
connections
FAN
MOTOR
3 4 2
7 86
CAUTION:
FAILURE TO WIRE THIS UNIT ACCORDING
TO THIS WIRING DIAGRAM MAY RESULT
IN INJURY TO THE INSTALLER OR USER.
FOR DEVIATIONS CONTACT THE FACTORY.
24
120
1
0
COM
115V/60HZ/1Ø
CONTROL CIRCUIT POWER
FROM STEP DOWN
TRANSFORMER (BY OTHERS)
GND
L2, (BL)
L1, (BK)
Y
R
BK
WH
PE
MOTOR
1
FAN
MOTOR
8
6
FAN
MOTOR
4
2
See note #6
for motor
connections
7
3
7
3
1
0
2. ALL COMPONENTS MUST AGREE WITH
THEIR RESPECTIVE POWER SOURCE.
W
L1
P1-8
P1-3
P1-6
P1-5
* INTEGRATED
CONTROL
IND
PE
MOTOR
P1-4
MV
NTRL
P1-9
NTRL
P1-2
C
NTRL
EAC
W
L1
7. OPTIONAL UNIT DISCONNECT SWITCH
USED ON 115V UNITS ONLY.
6. UNIT IS SHIPPED WIRED FOR 115V. WHEN
WIRING FOR 230V FOLLOW THIS DIAGRAM
AND MOTOR WIRE LABELS FOR 230V.
P1-8
P1-3
P1-6
P1-5
* INTEGRATED
CONTROL
IND
PE
MOTOR
P1-4
MV
NTRL
P1-9
NTRL
P1-2
C
NTRL
R
P1-7
24V
SEC
COM
SPARK
IGNITOR
115V
L1
NTRL
P1-7
24V
L2
L1
230V/60HZ/1Ø
FAN CIRCUIT POWER
CIRCUIT BREAKER
(BY OTHERS)
115V/60HZ/1Ø
UNIT CIRCUIT
CIRCUIT BREAKER
(BY OTHERS)
*SHOWN WITH UNITED TECHNOLOGIES
LABEL, SEE CHART FOR OTHER LABELS
GND
L1
L2
GND
WIRING DIAGRAM, SINGLE STAGE, RELAY
5H080273B1
SEC
115V
L1
SPARK
IGNITOR
COM
NTRL
115V/60HZ/1Ø
CONTROL CIRCUIT POWER
FROM STEP DOWN
TRANSFORMER (BY OTHERS)
R
CONTROL CIRCUIT MUST BE 115V POWER
5. USED ON PROPELLER MODELS 100 AND LARGER.
4. USE TYPE 105°C REPLACEMENT WIRE
300V OR GREATER.
3. VERIFY THE POWER SOURCE AND
THE UNIT POLARITY.
EAC
230V Fan/Blower Power Only
1
0
1. ALL WIRING MUST COMPLY WITH NATIONAL
ELECTRIC CODE AND ALL LOCAL CODES.
NOTES TO INSTALLER:
8
4
See note #6
for motor
connections
6
2
REFER NOTE 7
Factory 115V Unit Power
THERMOSTAT
GAS
VALVE
THERMOSTAT
115V/60HZ/1Ø
UNIT POWER
CIRCUIT BREAKER
(BY OTHERS)
HIGH LIMIT
GR, (G)
L1, (BK)
L2, (WH)
HIGH LIMIT
HIGH LIMIT
GND
BK
PRESSURE
Factory 115V Unit Power
CALL FOR HEAT
BK
L1, (BK)
GAS
VALVE
SINGLE STAGE, DIRECT SPARK IGNITION,
100% SHUT-OFF, MULTIPLE RETRY W/ AUTO RESET FROM LOCKOUT
GAS
VALVE
INDICATES TERMINAL
BOARD CONNECTION
L2, (WH)
FUSE
24V
5H080273B1 REV _
CALL FOR HEAT
HIGH LIMIT
FLAME
SENSOR
LINE
FUSE
WIRING LEGEND
PRESSURE
6-461.1
FLAME
SENSOR
FACTORY WIRING
INTERNAL COMPONENT WIRING
FIELD WIRING
WIRE NUT
WIRING DIAGRAMS – MODELS HD/HDB, HDS/HDC, PTS/BTS
7
Y
HI
LIMIT
CONTROL
PRESSURE
SWITCH
Y
PIN 8
Y
HI
LOW VOLTAGE
THERMOSTAT
(BY OTHERS)
CALL FOR FAN
1ST STAGE
2ND STAGE
M
COM COM
WHITE ROGERS
GAS VALVE
R
L1
C
LIMIT CONTROL
(SEE NOTE 5)
R
HEAT
LIMIT CONTROL
(SEE NOTE 5)
R
R
L1
C
COM
24V
FS
IND
HEAT
R
PARK
UT
LABEL
W1
O
W2
1 4 7
2 5 8
3 6 9
BL
IGNITION
CONTROL
SPARK
IGNITOR
PARK
WH
HI
COM
LO
FLAME
SENSOR
BK
WH
PE
MOTOR
R
Y
24
120
BK
WH
PE
MOTOR
COM
0
XFMR
GND
See note #6
for motor
connections
FAN
MOTOR
3 4 2
7 8 6
XFMR
GND
See note #6
for motor
connections
FAN
MOTOR
3 4 2
CAUTION:
FAILURE TO WIRE THIS UNIT ACCORDING
TO THIS WIRING DIAGRAM MAY RESULT
IN INJURY TO THE INSTALLER OR USER.
FOR DEVIATIONS CONTACT THE FACTORY.
24
120
1
115V/60HZ/1Ø
CONTROL CIRCUIT POWER
FROM STEP DOWN
TRANSFORMER (BY OTHERS)
GND
0
COM
1
7 8 6
115V/60HZ/1Ø
UNIT POWER
CIRCUIT BREAKER
(BY OTHERS)
L2, (BL)
L1, (BK)
GR, (G)
L1, (BK)
L2, (WH)
230V/60HZ/1Ø
FAN CIRCUIT POWER
CIRCUIT BREAKERS
(BY OTHERS)
CONTROL CIRCUIT MUST BE 115V POWER
G
Y
HONEYWELL
GAS VALVE
R
Y
230V Fan/Blower Power Only
COM
24V
FS
IND
PARK
R
PARK
UT
LABEL
G
O
IGNITION
CONTROL
W1
1 4 7
2 5 8
3 6 9
BL
SWITCH
NOTE 7
SPARK
IGNITOR REFER
FLAME
SENSOR
W2
Y
LO
COM
WH
HONEYWELL
GAS VALVE
>Disconnect relay power leads (#2 & #6) from 115V
supply and connect 230V as shown.
>All other unit power must be 115V as shown.
>See note #6 for motor connections.
LIMIT
CONTROL
PRESSURE
SWITCH
PIN 8
Y
HI
LOW VOLTAGE
THERMOSTAT
(BY OTHERS)
CALL FOR FAN
1ST STAGE
2ND STAGE
M
COM COM
WHITE ROGERS
GAS VALVE
GND
Factory 115V Unit Power
5H080273B2 REV _
GND
115V/60HZ/1Ø
CONTROL CIRCUIT POWER
FROM STEP DOWN
TRANSFORMER (BY OTHERS)
24V
115V
24V
115V
7. OPTIONAL UNIT DISCONNECT SWITCH
USED ON 115V UNITS ONLY.
6. UNIT IS SHIPPED WIRED FOR 115V. WHEN
WIRING FOR 230V FOLLOW THIS DIAGRAM
AND MOTOR WIRE LABELS FOR 230V.
P6
L1
P9
IND
PE
MOTOR
R
G
W2
T-STAT
W1
P2
* INTEGRATED
CONTROL
P4
P7
HEAT
HI
M
HI
LO
HONEYWELL
GAS VALVE
COM
WHITE ROGERS
GAS VALVE
COM
P8
PRESSURE
SWITCH
P3
FS
COM
GND
24V
P6
L1
P9
IND
PE
MOTOR
R
G
W2
T-STAT
W1
P2
* INTEGRATED
CONTROL
P4
P7
HEAT
HI
M
HI
LO
FS
COM
SPARK
IGNITOR
0
1
7
8
FAN
MOTOR
4
GND
2
6
8
FAN
MOTOR
4
GND
2
6
See note #6
for motor
connections
3
7
See note #6
for motor
connections
3
*SHOWN WITH UNITED TECHNOLOGIES
LABEL, SEE CHART FOR OTHER LABELS
SPARK
IGNITOR
0
1
WIRING DIAGRAM, TWO STAGE, RELAY
5H080273B2
HONEYWELL
GAS VALVE
COM
WHITE ROGERS
GAS VALVE
COM
P8
PRESSURE
SW ITCH
P3
CONTROL CIRCUIT MUST BE 115V POWER
230V Fan/Blower Power Only
GND
24V
5. USED ON PROPELLER MODELS 100 AND LARGER.
4. USE TYPE 105°C REPLACEMENT WIRE
300V OR GREATER.
3. VERIFY THE POWER SOURCE AND
THE UNIT POLARITY.
2. ALL COMPONENTS MUST AGREE WITH
THEIR RESPECTIVE POWER SOURCE.
1. ALL WIRING MUST COMPLY WITH NATIONAL
ELECTRIC CODE AND ALL LOCAL CODES.
NOTES TO INSTALLER:
GND
L1
L2
230V/60HZ/1Ø
FAN CIRCUIT POWER
CIRCUIT BREAKER
(BY OTHERS)
L1
L2
115V/60HZ/1Ø
UNIT POWER
CIRCUIT BREAKER
(BY OTHERS)
Factory 115V Unit Power
TWO STAGE, DIRECT SPARK IGNITION,
100% SHUT-OFF, MULTIPLE RETRY W/ AUTO RESET FROM LOCKOUT
HIGH LIMIT
HIGH LIMIT
INDICATES TERMINAL
BOARD CONNECTION
HIGH LIMIT
CALL FOR
HEAT
HIGH LIMIT
24V
CALL FOR
HEAT
LINE
FLAME
SENSOR
WIRING LEGEND
W2
W2
BK
BK
W1
W1
L1, (BK)
L1, (BK)
LO
FIRE
LO
FIRE
L2, (WH)
L2, (WH)
HI
FIRE
HI
FIRE
6-461.1
FLAME
SENSOR
8
FACTORY WIRING
INTERNAL COMPONENT WIRING
FIELD WIRING
WIRE NUT
WIRING DIAGRAMS – MODELS HD/HDB, HDS/HDC, PTS/BTS
6-461.1
Y
PIN 6
PIN 5
Y
R
1 4 7
2 5 8
3 6 9
BL
R
SEC
COM
COM
N
E
U
T
R
A
L
N
E
U
T
R
A
L
24VAC
L1
L1
L1
IND
EAC
EAC/BLO
IND
PARK
COOL
XFMR
PARK
UT
LABEL
M1
HONEYWELL
LABEL
REFER
NOTE 7
SWITCH
L1, (BK)
R
Y
BK
WH
PE
MOTOR
7. OPTIONAL UNIT DISCONNECT SWITCH.
6. NA
5. MAKE MOTOR CONNECTIONS PER THE
MOTOR WIRE DIAGRAM.
4. USE TYPE 105°C REPLACEMENT WIRE
300V OR GREATER.
3. VERIFY THE POWER SOURCE AND
THE UNIT POLARITY.
2. ALL COMPONENTS MUST AGREE WITH
THEIR RESPECTIVE POWER SOURCE.
1. ALL WIRING MUST COMPLY WITH NATIONAL
ELECTRIC CODE AND ALL LOCAL CODES.
NOTES TO INSTALLER:
24
120
COM
See note #5
for motor
connections
3Ø Starter
(By Others)
115V/60HZ/1Ø
CONTROL CIRCUIT POWER
FROM STEP DOWN
TRANSFORMER (BY OTHERS)
SINGLE STAGE, DIRECT SPARK IGNITION,
100% SHUT-OFF, MULTIPLE RETRY W/ AUTO RESET FROM LOCKOUT
C
R
W
G
Y
WH
CAUTION:
FAILURE TO WIRE THIS UNIT ACCORDING
TO THIS WIRING DIAGRAM MAY RESULT
IN INJURY TO THE INSTALLER OR USER.
FOR DEVIATIONS CONTACT THE FACTORY.
LIMIT
CONTROL
PRESSURE
SWITCH
LOW VOLTAGE
THERMOSTAT
(BY OTHERS)
O
IGNITION
CONTROL
SPARK
IGNITOR
BK
FLAME
SENSOR
L2, (WH)
L3
L2
L1
L2
T3
L3
FAN
MOTOR
T2
C
XFMR
T1
L1
5H080274B1 REV. ~
GND
T1
L1
L3
T3
FAN
MOTOR
T2
C
L2
L1 L2 L3
EAC
W
L1
L1
P1-8
P1-3
P1-6
P1-5
* INTEGRATED
CONTROL
IND
PE
MOTOR
115V/60HZ/1Ø
CONTROL CIRCUIT POWER
FROM STEP DOWN
TRANSFORMER (BY OTHERS)
3Ø/60HZ
FAN POWER CIRCUIT
CIRCUIT BREAKERS
(BY OTHERS)
P1-4
P1-9
NTRL
C
NTRL
R
P1-7
24V
COM
SEC
115V
L1
NTRL
SPARK
IGNITOR
WIRING DIAGRAM, SINGLE STAGE, 3 Ø
MV
P1-2
NTRL
L2
*SHOWN WITH UNITED TECHNOLOGIES
LABEL, SEE CHART FOR OTHER LABELS
5H080274B1
See note #5
for motor
connections
3Ø Starter
(By Others)
GND
CALL FOR HEAT
3Ø/60HZ
FAN CIRCUIT POWER
CIRCUIT BREAKERS
(BY OTHERS)
THERMOSTAT
INDICATES TERMINAL
BOARD CONNECTION
HIGH LIMIT
24V
PRESSURE
GAS
VALVE
3 Phase
GAS
VALVE
115V
FUSE
WIRING LEGEND
FLAME
SENSOR
FACTORY WIRING
INTERNAL COMPONENT WIRING
FIELD WIRING
WIRE NUT
WIRING DIAGRAMS – MODELS HD/HDB, HDS/HDC, PTS/BTS
9
6-461.1
Y
LO
R
COM
24V
FS
L2, (WH)
L1, (BK)
BK
R
Y
BK
WH
PE
MOTOR
5. MAKE MOTOR CONNECTIONS PER THE
MOTOR WIRE DIAGRAM.
4. USE TYPE 105°C REPLACEMENT WIRE
300V OR GREATER.
3. VERIFY THE POWER SOURCE AND
THE UNIT POLARITY.
2. ALL COMPONENTS MUST AGREE WITH
THEIR RESPECTIVE POWER SOURCE.
24
120
COM
See note #5
for motor
connections
3Ø Starter
(By Others)
115V/60HZ/1Ø
CONTROL CIRCUIT POWER
FROM STEP DOWN
TRANSFORMER (BY OTHERS)
1. ALL WIRING MUST COMPLY WITH NATIONAL
ELECTRIC CODE AND ALL LOCAL CODES.
NOTES TO INSTALLER:
TWO STAGE, DIRECT SPARK IGNITION,
100% SHUT-OFF, MULTIPLE RETRY W/ AUTO RESET FROM LOCKOUT
R
L1
C
IND
HEAT
R
PARK
UT
LABEL
PARK
O
W1
1 4 7
2 5 8
3 6 9
BL
IGNITION
CONTROL
SPARK
IGNITOR
FLAME
SENSOR
W2
WH
HI
COM
G
Y
HONEYWELL
GAS VALVE
CAUTION:
FAILURE TO WIRE THIS UNIT ACCORDING
TO THIS WIRING DIAGRAM MAY RESULT
IN INJURY TO THE INSTALLER OR USER.
FOR DEVIATIONS CONTACT THE FACTORY.
LIMIT
CONTROL
PRESSURE
SWITCH
PIN 8
Y
HI
LOW VOLTAGE
THERMOSTAT
(BY OTHERS)
CALL FOR FAN
1ST STAGE
2ND STAGE
M
COM COM
WHITE ROGERS
GAS VALVE
L3
L2
L1
L2
T3
L3
FAN
MOTOR
T2
C
XFMR
T1
L1
5H080274B2 REV. ~
GND
24V
115V
L2
P6
P9
IND
PE
MOTOR
R
G
W2
T-STAT
W1
P2
P4
L2
P7
HI
M
LO
HONEYWELL
GAS VALVE
COM
P8
FS
COM
SPARK
IGNITOR
FAN
MOTOR
See note #5
for motor
connections
WIRING DIAGRAM, TWO STAGE, 3 Ø
HI
T3
L3
PRESSURE
SWITCH
P3
WHITE ROGERS
GAS VALVE
COM
T2
C
3Ø/60HZ
FAN POWER CIRCU
CIRCUIT BREAKERS
(BY OTHERS)
* INTEGRATED
CONTROL
HEAT
T1
L1
GND L1 L2 L3
3Ø Starter
(By Others)
5H080274B2
GND
24V
L1
L1
115V/60HZ/1Ø
CONTROL CIRCUIT POWER
FROM STEP DOWN
TRANSFORMER (BY OTHERS)
HIGH LIMIT
3Ø/60HZ
FAN CIRCUIT POWER
CIRCUIT BREAKERS
(BY OTHERS)
W2
INDICATES TERMINAL
BOARD CONNECTION
CALL FOR
HEAT
24V
W1
3 Phase
LO
FIRE
115V
HI
FIRE
WIRING LEGEND
FLAME
SENSOR
10
FACTORY WIRING
INTERNAL COMPONENT WIRING
FIELD WIRING
WIRE NUT
WIRING DIAGRAMS – MODELS HD/HDB, HDS/HDC, PTS/BTS
W
6-461.1
BL
GY
R
1 4 7
2 5 8
3 6 9
R
UNIT LIMIT
CONTROL
AUTO RESET
C
R
W
G
Y
BK
O
R
Y
N
E
U
T
R
A
L
N
E
U
T
R
A
L
W
W
NOTES TO INSTALLER:
1. ALL WIRING MUST COMPLY WITH NATIONAL
ELECTRIC CODE AND ALL LOCAL CODES.
2. ALL COMPONENTS MUST AGREE WITH
THEIR RESPECTIVE POWER SOURCE.
3. VERIFY THE POWER SOURCE AND THE UNIT POLARITY.
4. USE TYPE 105°C REPLACEMENT WIRE 300V OR GREATER.
BK
LOW VOLTAGE
THERMOSTAT
(BY OTHERS)
T2
F
G
T1
C
V
SEC
IND
IND
COM
L1
COM
L1
L1
XFMR
24VAC
EAC
PARK
PARK
UT
LABEL
EAC/BLO
COOL
M1
HONEYWELL
LABEL
CAUTION:
FAILURE TO WIRE THIS UNIT ACCORDING TO THIS WIRING
DIAGRAM MAY RESULT IN INJURY TO THE INSTALLER OR
USER. FOR DEVIATIONS CONTACT THE FACTORY.
FAN
MOTOR
Y
PIN 6
PRESSURE
SWITCH
PIN 5
Y
GAS
VALVE
BL
BLU
GAS VALVE
OPEN
AMB
R
CALL FOR
HEAT
POWER
GRN
R
R
Y
Y
W
BK
W
BK
W
GND
L1, (BK)
COM
5H080716B1 REV C
115V/60HZ/1Ø POWER
CIRCUIT BREAKER
(BY OTHERS)
L2, (WH)
L1, (BK)
GR, (G)
XFMR
24
120
PE LIMIT
CONTROL
MANUAL
RESET
PE
MOTOR
SINGLE STAGE, DIRECT SPARK IGNITION,
100% SHUT-OFF, MULTIPLE RETRY
W/ AUTO RESET FROM LOCKOUT
W
BR
SPARK
IGNITOR
115V Unit Power
L2, (W)
IGNITION
CONTROL
L1
W
IND
INDUCER
MOTOR
DISCONNECT
SWITCH
P1-8 P1-3
T2
NTRL
T1
C
F
V
R
P1-7
GREEN
POWER
TO UNIT
24V
COM
AMBER
CALL FOR
HEAT
BLUE
GAS VALVE
OPEN
SEC
115V
L1
NTRL
SPARK
IGNITOR
WIRING DIAGRAM, PTC
5H080716B1
THERMOSTAT
MV
C
NTRL NTRL
PE LIMIT
CONTROL
MANUAL
RESET
GND
115V Unit Power
*SHOWN WITH UNITED TECHNOLOGIES
LABEL, SEE CHART FOR OTHER LABELS
P1-6 P1-5 P1-4 P1-2 P1-9
* INTEGRATED
CONTROL
EAC
GROUND
L1 L2
BLOWER
MOTOR
GROUND
CALL FOR
HEAT
FLAME
SENSOR
115V/60HZ/1Ø
CIRCUIT BREAKER
(BY OTHERS)
HIGH LIMIT
AUTO RESET
INDICATES TERMINAL
BOARD CONNECTION
PRESSURE
24V
GAS VALVE
LINE
FUSE
WIRING LEGEND
FLAME SENSOR
11
FACTORY WIRING
INTERNAL COMPONENT WIRING
FIELD WIRING
WIRE NUT
WIRING DIAGRAMS – MODEL PTC
W
BL
6-461.1
BK
0
3
4
2
1
7
8
6
R
W
O
BL
BK
RELAY
1 4 7
2 5 8
3 6 9
UNIT LIMIT R
CONTROL
AUTO RESET
C
R
W
G
Y
R
Y
N
E
U
T
R
A
L
N
E
U
T
R
A
L
W
GY
NOTES TO INSTALLER:
1. ALL WIRING MUST COMPLY WITH NATIONAL
ELECTRIC CODE AND ALL LOCAL CODES.
2. ALL COMPONENTS MUST AGREE WITH
THEIR RESPECTIVE POWER SOURCE.
3. VERIFY THE POWER SOURCE AND THE UNIT POLARITY.
4. USE TYPE 105°C REPLACEMENT WIRE 300V OR GREATER.
BK
LOW VOLTAGE
THERMOSTAT
(BY OTHERS)
T2
F
G
T1
C
V
COM
IND
IND
COM
L1
XFMR
SEC
L1
24VAC
EAC
L1
PARK
PARK
UT
LABEL
EAC/BLO
COOL
M1
HONEYWELL
LABEL
IGNITION
CONTROL
CAUTION:
FAILURE TO WIRE THIS UNIT ACCORDING TO THIS WIRING
DIAGRAM MAY RESULT IN INJURY TO THE INSTALLER OR
USER. FOR DEVIATIONS CONTACT THE FACTORY.
FAN
MOTOR
Y
PIN 6
PRESSURE
SWITCH
PIN 5
Y
GAS
VALVE
FLAME
SENSOR
BLU
GAS VALVE
OPEN
AMB
R
CALL FOR
HEAT
POWER
GRN
R
W
R
Y
Y
BK
W
W
BL
GND
L1, (BK)
COM
5H080716B2 REV C
115V/60HZ/1Ø POWER
CIRCUIT BREAKER
(BY OTHERS)
L2, (W)
L1, (BK)
GR, (G)
XFMR
24
120
PE LIMIT
CONTROL
MANUAL
RESET
PE
MOTOR
SINGLE STAGE, DIRECT SPARK IGNITION,
100% SHUT-OFF, MULTIPLE RETRY
W/ AUTO RESET FROM LOCKOUT
W
BR
SPARK
IGNITOR
FAN
MOTOR
DISCONNECT
SWITCH
2
6
L1
4
8
W
3
7
0
T2
GROUND
NTRL
PE LIMIT
CONTROL
MANUAL
RESET
T1
C
F
V
R
P1-7
GREEN
POWER
TO UNIT
24V
COM
AMBER
CALL FOR
HEAT
BLUE
GAS VALVE
OPEN
SEC
115V
L1
NTRL
WIRING DIAGRAM, PTC, RELAY
5H080716B2
THERMOSTAT
MV
C
NTRL NTRL
SPARK
IGNITOR
115V Unit Power
GND
*SHOWN WITH UNITED TECHNOLOGIES
LABEL, SEE CHART FOR OTHER LABELS
P1-6 P1-5 P1-4 P1-2 P1-9
* INTEGRATED
CONTROL
IND
PE
MOTOR
L1 L2
P1-8 P1-3
EAC
1
CALL FOR
HEAT
115V Unit Power
L2, (W)
115V/60HZ/1Ø
CIRCUIT BREAKER
(BY OTHERS)
HIGH LIMIT
AUTO RESET
INDICATES TERMINAL
BOARD CONNECTION
PRESSURE
24V
GAS VALVE
LINE
FUSE
WIRING LEGEND
FLAME SENSOR
12
FACTORY WIRING
INTERNAL COMPONENT WIRING
FIELD WIRING
WIRE NUT
WIRING DIAGRAMS – MODEL PTC
WIRING DIAGRAMS – THERMOSTAT & SUMMER/WINTER SWITCH
Single Stage Thermostat & Summer/Winter Switch Wiring
SUMMER/WINTER SWITCH & 1-STAGE ROOM STAT
WITHOUT SUB-BASE FAN SWITCH
1-STAGE ROOM STAT
WITH SUB-BASE FAN SWITCH
MODELS HD/HDB, HDS/HDC, AND PTS/BTS
1-STAGE LOW VOLTAGE ROOM
STAT WITH SUB-BASE SWITCHING
(BY OTHERS)
R
C
W
MODEL PTC
FAN OPERATION (BASED ON FAN SUB-BASE SWITCH):
SWITCH = ON - CONTINUOUS
SWITCH = AUTO - INTERMITTENT ON A CALL FOR HEAT
1-STAGE LOW VOLTAGE ROOM
STAT WITH SUB-BASE SWITCHING
(BY OTHERS)
G
R
2-STAGE ROOM STAT
WITH SUB-BASE FAN SWITCH
G
G
T2
F
G
T1
C
V
TERMINAL BOARD
ON UNIT HEATER
W
R
C
1-STAGE LOW VOLTAGE ROOM
STAT WITH NO SWITCHING
(BY OTHERS)
R
C
FAN OPERATION:
SUMMER - CONTINUOUS FAN
WINTER - INTERMITTENT FAN ON A CALL FOR HEAT
1-STAGE LOW VOLTAGE ROOM
STAT WITH NO SWITCHING
(BY OTHERS)
W
R
C
SUMMER/WINTER
SWITCH
(BY OTHERS)
FAN OPERATION:
SUMMER - CONTINUOUS FAN
WINTER - INTERMITTENT FAN ON A CALL FOR HEAT
W
SUMMER/WINTER
SWITCH
(BY OTHERS)
WINTER
TERMINAL STRIP
ON UNIT HEATER
TERMINAL BOARD
ON UNIT HEATER
WINTER
Y
SUMMER
G
SUMMER
W
T2
F
G
T1
C
V
R
C
MODELS HD/HDB, HDS/HDC, AND PTS/BTS
SUMMER/WINTER SWITCH & 2-STAGE ROOM STAT
WITHOUT SUB-BASE FAN SWITCH
W
TERMINAL STRIP
ON UNIT HEATER
Y
Two Stage Thermostat & Summer/Winter Switch Wiring
2-STAGE LOW VOLTAGE ROOM
STAT WITH SUB-BASE SWITCHING
(BY OTHERS)
R
W1 W2
C
FAN OPERATION (BASED ON FAN SUB-BASE SWITCH):
SWITCH = ON - CONTINUOUS
SWITCH = AUTO - INTERMITTENT ON A CALL FOR HEAT
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.
G
TERMINAL STRIP
ON UNIT HEATER
G
W1
W2
C
R
2-STAGE LOW VOLTAGE ROOM
STAT WITH NO SWITCHING
(BY OTHERS)
R
C
FAN OPERATION:
SUMMER - CONTINUOUS FAN
WINTER - INTERMITTENT FAN ON A CALL FOR HEAT
W1 W2
SUMMER/WINTER
SWITCH
(BY OTHERS)
TERMINAL STRIP
ON UNIT HEATER
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.
WINTER
G
SUMMER
W1
W2
C
R
NOTE:
GENERIC ROOM STAT TERMINALS SHOWN. ACTUAL STAT MAY USE DIFFERENT TERMINALS AND/OR
WIRING. PLEASE CONSULT WIRING INSTRUCTIONS FOR STAT FOR PROPER WIRING.
13
C
FAN OPERATION (BASED ON FAN SUB-BASE SWITCH):
SWITCH = ON - CONTINUOUS
SWITCH = AUTO - INTERMITTENT ON A CALL FOR HEAT
6-461.1
Note: A Summer/Winter switch used on these models does
NOT require a control relay as was required on previous
models.
WIRING DIAGRAMS – ACCESSORIES
Wiring Multiple Single Stage Units to a Single Thermostat
MODELS HD/HDB, HDS/HDC, AND PTS/BTS
1-STAGE LOW VOLTAGE
ROOM STAT (NO SWITCHING)
(BY OTHERS)
R
MODEL PTC
TERMINAL STRIP
ON UNIT HEATER #1
1-STAGE LOW VOLTAGE
ROOM STAT (NO SWITCHING)
(BY OTHERS)
W
R
TERMINAL BOARD
ON UNIT HEATER #1
W
Y
G
T2
F
G
T1
C
V
W
R
C
0
2 4 3
2 4 3
6 8 7
6 8 7
0
DPDT CONTROL
RELAY
(BY OTHERS)
2 4 3
2 4 3
6 8 7
6 8 7
1
DPDT CONTROL
RELAY
(BY OTHERS)
1
Y
G
W
T2
F
G
T1
C
V
R
C
0
2 4 3
2 4 3
6 8 7
6 8 7
DPDT CONTROL
RELAY
(BY OTHERS)
0
1
2 4 3
6 8 7
6 8 7
1
TERMINAL STRIP
ON UNIT HEATER #2
TO ADDITIONAL
UNIT/RELAY PAIRINGS
(IF APPLICABLE)
2 4 3
DPDT CONTROL
RELAY
(BY OTHERS)
TERMINAL BOARD
ON UNIT HEATER #2
TO ADDITIONAL
UNIT/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
T2
F
G
T1
C
V
TERMINAL BOARD
ON UNIT HEATER
SEE NOTE BELOW
FOR REMOVAL OF
JUMPER BARS
ACCESSORY
ACCESSORY
NOTE:
FOR FIELD WIRED CONDENSATE PUMP AUX SWITCH AND/OR CONDENSATE DRAIN
LINE 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 INSTALLATION
INSTRUCTIONS 6-585 FOR THE CONDENSATE PUMP AND/OR 6-586 FOR THE
CONDENSATE DRAIN LINE SAFETY OVERFLOW SWITCH.
14
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THIS PAGE INTENTIONALLY LEFT BLANK
6-461.1
15
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