Modine PDP150AE0130 Modine Wiring Diagram

6-446

April, 2005

WIRING DIAGRAMS

Models PDP/BDP gas-fired unit heaters

Diagram Selection

Diagrams are provided for both single and three-phase circuits,
and are readily identified in the Selection Table on the following
page. The Selection Table enables easy selection of the correct
wiring diagram after the electrical components of the unit
heater have been determined. The control codes are listed to
aid in locating the correct diagram.

Diagram Interchangeability

The following gas-fired unit heater wiring diagrams are for
either 115-volt, 60-Hertz, single-phase power, or for 230-volt,
60 Hertz, three-phase electrical service.

The 115v/60Hz/1φ diagrams may also be utilized for 230v/60Hz/
1φ by substituting 230-volt components for the 115-volt shown.

The 230v/60 Hz/3φ diagrams may be modified to 460v/60
Hz/3φ by adding a 460v to 230v step down transformer and
wiring the unit as shown in the wiring “inset” on all 3-phase
wiring diagrams.

The 460v/60Hz/3φ diagrams may also be utilized for 575v/60Hz/
3φ by substituting 575-volt components for the 460-volt shown.

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.

CAUTION

Turn off all power and gas to unit before wiring. Failure to wire
this unit according to this wiring diagram may result in injury
to the installer or user. For deviations, contact factory.

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
V Volts
Hz Cycle or Hertz
φ Phase
LC Limit Control
THERM or TH Thermostat
MV Main Valve
PV Pilot Valve
SO Shut Off
RC Relay Contact or Coil
G Ground
H Hot
SW Switch
EPS Electric Pilot Switch
HI High
Lo Low
C Common
“J” Box Junction Box
H1, H2, etc. Transformer Primary Terminals
SUM Summer Contact (Summer/Winter Switch)
WIN Winter Contact (Summer/Winter Switch)
S-W Summer/Winter Switch
O.L.C. Overload Contact
C.S. Power Venter Centrifugal Switch
FTc Fan Timer Contact
SPDT Single-Pole Double-Throw Switch
VA Volt-Ampere
W Watts

Wire Color Coding

BK Black
BL Blue
R Red
W White
Y Yellow
X1,X2, etc. Transformer Secondary Terminals
L1, L2, etc. Electric Load Terminals
T1, T2, etc. Starter or Motor Terminals

6-446 — MODELS PDP/BDP

Unit Power Requirements (AMPS) – PDP Models

Power PDP 30, PDP 75, PDP 125, PDP 175, PDP 250 PDP 300 PDP 350,
Supply 50 100 150 200 400

115/1 2.7 3.3 4.0 5.1 7.7 9.8 11.1
208/1 1.3 1.9 1.9 2.8 - - ­ 208/1

① 2.4 2.4 2.4 4.8 4.8 7.2 7.2

230/1 1.3 1.9 1.9 2.8 3.7 4.7 5.5
230/1 ① 2.2 2.2 2.2 3.3 4.4 6.5 6.5
208/3 ① 2.4 2.4 2.4 4.8 4.8 7.2 7.2
230/3 ① 2.2 2.2 2.2 3.3 4.4 6.5 6.5
460/3 ① 1.1 1.1 1.1 1.6 2.2 3.3 3.3
575/3 ① 0.9 0.9 0.9 1.3 1.7 2.6 2.6

① With accessory transformer.

Unit Power Requirements (AMPS) – BDP Models

Power HP BDP BDP BDP BDP BDP BDP BDP BDP BDP BDP BDP
Supply 50 75 100 125 150 175 200 250 300 350 400

115/1 1/4 6.0 6.0 6.0 6.0 6.0 - 6.0 - - - ­ 230/1 1/4 4.0 4.0 4.0 4.0 4.0 - 4.0 - - - ­ 200/3 1/4 2.6 2.6 2.6 2.6 2.6 - 2.6 - - - ­ 230/3 1/4 2.5 2.5 2.5 2.5 2.5 - 2.5 - - - ­ 460/3 1/4 1.9 1.9 1.9 1.9 1.9 - 1.9 - - - ­ 575/3 1/4 1.8 1.8 1.8 1.8 1.8 - 1.8 - - - ­ 115/1 1/3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 - - ­ 230/1 1/3 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 - - ­ 200/3 1/3 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 - - ­ 230/3 1/3 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 - - ­ 460/3 1/3 1.9 1.9 1.9 1.9 1.9 1.9 1.9 1.9 - - ­ 575/3 1/3 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 - - ­ 115/1 1/2 10.3 10.3 10.3 10.3 10.3 10.3 10.3 10.3 - - ­ 230/1 1/2 5.3 5.3 5.3 5.3 5.3 5.3 5.3 5.3 - - ­ 200/3 1/2 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 - - ­ 230/3 1/2 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 - - ­ 460/3 1/2 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 - - ­ 575/3 1/2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 - - ­ 115/1 3/4 13.3 13.3 13.3 13.3 13.3 13.3 13.3 13.3 - - ­ 230/1 3/4 6.7 6.7 6.7 6.7 6.7 6.7 6.7 6.7 - - ­ 200/3 3/4 4.1 4.1 4.1 4.1 4.1 4.1 4.1 4.1 - - ­ 230/3 3/4 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 - - ­ 460/3 3/4 2.6 2.6 2.6 2.6 2.6 2.6 2.6 2.6 - - ­ 575/3 3/4 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 - - ­ 115/1 1 - 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 15.7 ­ 230/1 1 - 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 ­ 200/3 1 - 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.9 ­ 230/3 1 - 4.8 4.8 4.8 4.8 4.8 4.8 4.8 4.8 4.8 ­ 460/3 1 - 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 ­ 575/3 1 - 2.6 2.6 2.6 2.6 2.6 2.6 2.6 2.6 2.6 ­ 115/1 1-1/2 - - - 17.5 - 17.5 17.5 17.5 17.5 17.5 17.5
230/1 1-1/2 - - - 8.9 - 8.9 8.9 8.9 8.9 8.9 8.9
200/3 1-1/2 - - - 6.1 - 6.1 6.1 6.1 6.1 6.1 6.1
230/3 1-1/2 - - - 6.1 - 6.1 6.1 6.1 6.1 6.1 6.1
460/3 1-1/2 - - - 3.6 - 3.6 3.6 3.6 3.6 3.6 3.6
575/3 1-1/2 - - - 3.1 - 3.1 3.1 3.1 3.1 3.1 3.1
115/1 2 - - - - - - - - - - ­ 230/1 2 - - - - - - - - - - ­ 200/3 2 - - - - - 8.1 - 8.1 8.1 8.1 8.1
230/3 2 - - - - - 7.3 - 7.3 7.3 7.3 7.3
460/3 2 - - - - - 4.3 - 4.3 4.3 4.3 4.3
575/3 2 - - - - - 3.5 - 3.5 3.5 3.5 3.5
115/1 3 - - - - - - - - - - ­ 230/1 3 - - - - - - - - - - ­ 200/3 3 - - - - - - - - 11.2 11.2 11.2
230/3 3 - - - - - - - - 9.5 9.5 9.5
460/3 3 - - - - - - - - 5.4 5.4 5.4
575/3 3 - - - - - - - - 4.6 4.6 4.6
115/1 5 - - - - - - - - - - ­ 230/1 5 - - - - - - - - - - ­ 200/3 5 - - - - - - - - - 16.5 16.5
230/3 5 - - - - - - - - - 14.3 14.3
460/3 5 - - - - - - - - - 7.8 7.8
575/3 5 - - - - - - - - - 6.5 6.5

i

6-446 — MODELS PDP/BDP

Wiring Diagram Selection

A. Field and Submittal Wiring Diagram Selection

Wiring in the field changes little when the brand of the

controls furnished on the unit heater changes. Select correct
wiring diagrams as follows:

1. Determine unit heater model and size.

2. Select control code number from Table 1.

3. Reference unit heater model in the Page Location Index
with control code number and determine correct page
number for single-phase or three-phase control. Single­phase wiring diagram page numbers are in the upper left
of box and three-phase diagrams are in the lower right of
box.

4. Wiring diagrams for unit heater accessories are listed in
Table 2. Use the accessory diagrams along with the unit
wiring diagrams for complete wiring instructions.

B. Service and Troubleshooting

Because internal or factory wiring may vary depending
on controls manufacturer, the wiring diagrams must be
selected with the series identity number when servicing
or troubleshooting a unit heater control system. Wiring
diagrams in this bulletin are for unit heaters manufactured
after June 2003 and the series identity number is the 5th
thru the 7th digits of the unit heater serial number.

EXAMPLE: Serial No. – 01121010697 has a series identity
number of 101.

To select the correct wiring diagram:

1. Determine unit heater model and size from serial plate
located on the side of the unit.

2. Determine the control code numbers from box marked
Control Code, also on the serial plate.

3. Determine the series identity number of the unit heater,
then proceed with Step 3 of Field and Submittal Wiring
Diagram Selection.

Example Selection

Select correct single-phase wiring diagram for a PDP175A
Control Code 11, series identity number 101.

Locate the Page Location Index which shows the page numbers
for PDP and BDP units with series identity number 101 (see
page iii). Select the page number where the column for the
PDP175 intersects with the line for control code 11. The correct
single phase wiring diagram for this unit is found on page 1 in
the upper left portion of box. If the unit also had a summer/winter
switch the accessory wiring diagram found on page C-2 as per
Table 2, would also be required for complete wiring information.

Two-in-one Diagrams

Two wiring diagrams are furnished for each circuit configuration
in this manual. Included are a connection diagram at the left
for field installation and circuit schematic at the right to aid in
continuity and trouble shooting.

The heavier lines in the connection diagram indicate line voltage;
the lighter lines indicate low voltage. Solid lines show pre-wiring
performed at the factory; dotted lines inform the installer of
connections required to put the heater in operation.

Table 1
Control Code Descriptions

Control Code
Number Description

11,12,13,14 Single-Stage, Standing Pilot, 100% Shut-Off, Natural Gas

81,82,91,92 Single-Stage, Standing Pilot, 100% Shut-Off, Propane Gas

25,26 Two-Stage, Standing Pilot, 100% Shut-Off, Natural Gas

83,84 Two-Stage, Standing Pilot, 100% Shut-Off, Propane Gas

30,31,32,33 Single-Stage, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Natural Gas

85,86,93,94 Single-Stage, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Propane Gas

59,60 Mechanical Modulation with Automatic Pilot Ignition, Non-100% Shut-Off, Natural Gas, BDP Only

89,90 Mechanical Modulation with Automatic Pilot Ignition, Non-100% Shut-Off, Propane Gas, BDP Only

63,64 Two-Stage, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Natural Gas

87,88 Two-Stage, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Propane Gas

Table 2
Accessory Wiring Diagram Page Location Index ➀

Page Accessory

C-1 Energy-Saver Kit

C-2 Summer/Winter Switch

➀ See paragraph A, step 4 under “Wiring Diagram Selection”.

ii

6-446 — MODELS PDP/BDP

Models PDP or BDP Page Location Index ➀

Control Model Size (series identity 101) ➀
Code 30 50 75 100 125 150 175 200 250 300 350 400

11 or 12 1 1 1 1 1 1 1 1 1 3 3
2 2 2 2 2 2 2 2 2 4 4
13 or 14
17 17 17 17 17 17 17 17 17 18 18
25 or 26 5 5 5 5 5 5 5 7 7 7 7 7
6 6 6 6 6 6 6 8 8 8 8 8
30 or 31 9 9 9 9 9 9 9 9 9 9 9
10 10 10 10 10 10 10 10 10 10 10
32 or 33
19 19 19 19 19 19 19 19 19 19 19
59 or 60 11 11 11 11 11 11
12 12 12 12 12 12
63 or 64 15 15 15 15 15 15 15 15 15 15 15 15
16 16 16 16 16 16 16 16 16 16 16 16
81 or 82 1 1 1 1 1 1 1 1 1 1 1
2 2 2 2 2 2 2 2 2 2 2
83 or 84 5 5 5 5 5 5 5 5 5 5 7 7
6 6 6 6 6 6 6 6 6 6 8 8
85 or 86 9 9 9 9 9 9 9 9 9 9 9
10 10 10 10 10 10 10 10 10 10 10
87 or 88 15 15 15 15 15 15 15 15 15 15 15 15
16 16 16 16 16 16 16 16 16 16 16 16
89 or 90 11 11 11 11 11 11
12 12 12 12 12 12
91 or 92
17 17 17 17 17 17 17 17 17
93 or 94

19 19 19 19 19 19 19 19 19 19 19

Control Model Size (series identity 102) ➀
Code 30 50 75 100 125 150 175 200 250 300 350 400

11 or 12 1 1 1 1 1 1 1 1 3 3 3 3
2 2 2 2 2 2 2 2 4 4 4 4

13 or 14
17 17 17 17 17 17 17 18 18 18 18
25 or 26

30 or 31 9 9 9 9 9 9 9 9 9 9 9 9
10 10 10 10 10 10 10 10 10 10 10 10
32 or 33
19 19 19 19 19 19 19 19 19 19 19
59 or 60 13 13 13 13 13 13 13 13 13 13
14 14 14 14 14 14 14 14 14 14
63 or 64 20 20 20 20 20 20 20 20 20 20 20 20
21 21 21 21 21 21 21 21 21 21 21 21
81 or 82 1 1 1 1 1 1 1 1 1 3 3 3
2 2 2 2 2 2 2 2 2 4 4 4
83 or 84

85 or 86 9 9 9 9 9 9 9 9 9 9 9 9
10 10 10 10 10 10 10 10 10 10 10 10
87 or 88 20 20 20 20 20 20 20 20 20 20 20 20
21 21 21 21 21 21 21 21 21 21 21 21
89 or 90 13 13 13 13 13 13 13 13 13 13
14 14 14 14 14 14 14 14 14 14
91 or 92
17 17 17 17 17 17 17 17 17 18 18
93 or 94

19 19 19 19 19 19 19 19 19 19 19

Control Model Size (series identity 103) ➀
Code 30 50 75 100 125 150 175 200 250 300 350 400

11 or 12 3 3 3 3
4 4 4 4
13 or 14
18 18 18 18
25 or 26

30 or 31 9 9 9 9 9 9 9 9 9 9 9 9
10 10 10 10 10 10 10 10 10 10 10 10
32 or 33
19 19 19 19 19 19 19 19 19 19 19
59 or 60

63 or 64

81 or 82 3 3 3 3
4 4 4 4
83 or 84

85 or 86 9 9 9 9 9 9 9 9 9 9 9 9
10 10 10 10 10 10 10 10 10 10 10 10
87 or 88

89 or 90

91 or 92
18 18 18 18

93 or 94 19 19 19 19 19 19 19 19 19 19 19

➀ Cell format represents single phase or three phase power as shown in the following example.

1-Ph

3-Ph

iii

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Combination

Gas

Control

TR

TH

Second Circuit

Breaker Req'd.

For 230V,200V,1Ø

Circuit Breaker

(By Others)

L2

(W)

L1

(BK)

115V/60Hz/1Ø Power Shown

Low

Volt

Therm

(By Others)

R

UNIT HEATER WIRING DIAGRAM

Limit

Control

BL

Ter mi n al

TD Relay

Board

Power

TDC

T2

BL

Motor

Exhauster

3

1

F

T1

R

TD Relay

C

TDC

Fan

V

4

2

G

Motor

Gnd

H

Pressure

2

Switch

Terminal

Board "G"

Switch

Limit

Control

VC

Indicates Terminal Board Connection

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

Xfmr

24V

115 V

t°

TD Relay

G

Heater

H

T1

F

Therm

T2

1

Alternate

Combination

Gas Control

Pressure

W

Pressure

Switch

BL

J-Box

BL

Gas Control

24V.LINE

WIRING LEGEND

FACTORY

FIELD

WIRE NUT

Power

Exhaust

Motor

L2(W)

L1(BK)

Second Circuit

115V/60Hz/1Ø Power Shown

Circuit Breaker

(By Others)

Breaker Req'd

Fan

Motor

For 230V,200V,1Ø

W

4

3

H

1

H

2

T-D Relay

BK

BL

BK

W

* 24V

BL

XFMR

Combination

5H78233C6 REV A Single-Stage, Standing Pilot, 100% Shut-Off, Single-Phase.

W

TR

TH

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.

Note to installer:

Attach this diagram near heater.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

to pressure switch wire routed outside

of J-box.

1

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Circuit Breaker

(By Others)

L1 L2 L3

230V/60Hz/3Ø Power Shown

L3

L2

L1

Fan

Motor

Starter

Coil

Starter

Overload

TD Relay

TDC

Motor

Power

Exhauster

3

1

3

TDC

TD Relay

1

230V

Xfmr

24V

t°

Therm

G

T1

TD Relay

Heater

TR

TH

Combination

Gas

Control

Pressure

HH

Switch

Limit

Control

F

VC

Indicated Terminal Board Connection

T2

Low

UNIT HEATER WIRING DIAGRAM

3 Phase

Starter

(By Others)

L3

L2L1

C

24V.Line

Volt

Therm

(By Others)

T3T2T1

Limit

Control

Fan

Motor

2

1

Alternate

Combination

Gas Control

Ter m in a l

Board "G"

Pressure

Switch

F

T2

Ter mi n alBoard

C

R

BL

T1

R

BL

BR

3

1

O

BK

W

G

V

W

4

H

H

2

T-D Relay

BK

BL

BL

Pressure

Switch

BL

Gnd

W

Gas Control

BL

TR

TH

J-Box

Combination

* Alternate Xfmr

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

L1

L2

Wiring Legend

Factory

Field

Wire Nut

L3

230V/60Hz/3Ø Power Shown

Circuit Breaker

(By Others)

Power

Exhaust

Motor

* 24V

Xfmr

5H78233C6 REV A Single-Stage, Standing Pilot, 100% Shut-Off, Three-Phase.

2

Failure to wire this unit according

to this wiring diagram may result

in injury to the installer or user.

Caution

Note to installer:

For deviations contact the factory.

Attach this diagram near heater.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

to pressure switch wire routed outside

of J-box.

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Fan

Circuit Breaker

(By Others)

L2

(W)

L1

(BK)

Second Circuit

Breaker Req'd.

For 230V,200V,1Ø

Power

Exhaust

3

TD Relay

TDC

1

Motor

42

TD Relay

TDC

Motor

Xfmr

G

24V

115 V

T1

t°

Therm

TD Relay

Heater

Combination

H

H

F

Gas

Control

Pressure

Switch

Limit

Control

TR

ECO

TH

Indicates Terminal Board Connection

115V/60Hz/1Ø Power Shown

Combination

Alternate

ECO

Low

Volt

Therm

(By Others)

UNIT HEATER WIRING DIAGRAM

Limit

Control

Gas Control

Connections

ECO

R

BL

Board "G"

Ter m in a l

TR

TH

Switch

Pressure

Ter mi n al

Board

V

T2

C

TR

Board "G"

Terminal

TH

ECO

Gas Control

Combination

Alternate

W

F

T2

T1

BL

G

V

C

Gnd

R

BL

J-Box

Pressure

Switch

ns

Connectio

ECO

Switch

Pressure

TH TR

Combination

Gas Control

ECO

Connection

ECO

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

W

4

3

H

1

H

2

T-D Relay

BK

BL

BK

W

* 24V

BL

Xfmr

24V.LINE

WIRING LEGEND

FACTORY

FIELD

WIRE NUT

Fan

Motor

Power

Exhaust

Motor

L2(W)

L1(BK)

Second Circuit

115V/60Hz/1Ø Power Shown

Circuit Breaker

(By Others)

Breaker Req'd

For 230V,200V,1Ø

5H78233C7 REV A Single-Stage, Standing Pilot, 100% Shut-Off, Single-Phase.

Note to installer:

Caution

Failure to wire this unit according

to this wiring diagram may result

in injury to the installer or user.

Attach this diagram near heater.

For deviations contact the factory.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

to pressure switch wire routed outside

of J-box

3

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Starter

Coil

Motor

Power

Circuit Breaker

(By Others)

L3

L1 L2 L3

L2

L1

230V/60Hz/3Ø Power Shown

Starter

Overload

Fan

Motor

TD Relay

TDC

24

Exhaust

3

TD Relay

TDC

1

230V

Xfmr

G

24V

T1

t°

Therm

TD Relay

Heater

H

H

F

Combination

Gas

Control

Pressure

Switch

Limit

Control

TR

ECO

TH

Indicates Terminal Board Connection

Low

Volt

Therm

(By Others)

UNIT HEATER WIRING DIAGRAM

3 Phase

Starter

(By Others)

L3

L2L1

C

24V.Line

CV

TR

TH

ECO

Connections

ECO

Switch

Pressure

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

Alternate

Combination

Gas Control

ECO

ECO

Connections

Terminal

Board "G"

TR

TH

Pressure

Switch

Board "G"

Terminal

Gas Control

Combination

Alternate

T2

TH TR

F

T2

Terminal

Board

R

Limit

Control

BL

T3T2T1

Fan

Motor

T1

BL

BR

BK

G

ECO

Combination

Gas Control

ECO

V

C

BL

Gnd

R

W

4

3

1

2

BK

O

BL

J-Box

H

H

T-D Relay

BL

Pressure

Switch

Connection

Wiring Legend

Factory

Field

Wire Nut

230V/60Hz/3Ø Power Shown

Circuit Breaker

L2

L3

(By Others)

L1

Power

Exhaust

Motor

* 24V

Xfmr

Caution

Failure to wire this unit according

5H78233C7 REV A Single-Stage, Standing Pilot, 100% Shut-Off, Three-Phase.

4

Note to installer:

Attach this diagram near heater.

to this wiring diagram may result

in injury to the installer or user.

For deviations contact the factory.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

to pressure switch wire routed outside

of J-box.

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Second Circuit

Breaker Req'd.

Circuit Breaker

(By Others)

L2

(W)

L1

(BK)

115V/60Hz/1Ø Power Shown

For 230V,200V,1Ø

Power

Exhauster

TDC

TD Relay

3

1

Motor

Fan

4

TDC

TD Relay

2

Motor

115 V

Xfmr

Two-Stage

Therm

24V

t°

High

G

T1

Combination

C

t°

Low

A

B

Gas Control

TD Relay

Heater

1

W

21

Low-Stage

Operator

Combination

H

Gas Control

BA

High-Stage

Operator

H

Switch

C

Pressure

Limit

Control

V

Indicates Terminal Board Connection

F

T2

2

W

Low High

(By Others)

Therm

Low Volt

Two-Stage

C

UNIT HEATER WIRING DIAGRAM

24V.

Line

Wiring Legend

Factory

Field

Wire Nut

L1(BK)

L2(W)

115V/60Hz/1Ø Power Shown

Circuit Breaker

(By Others)

Second Circuit

Breaker Req'd.

For 230V,200V,1Ø

Limit

Power

Exhaust

Control

r

Moto

BL

F

T2

Terminal

Board

T1

R

BL

Fan

Motor

BL

W

G

V

C

R

3

1

BK

Gnd

W

4

H

H

2

T-D RELAY

BK

BL

BL

* 24V

Xfmr

BL

J-Box

Switch

Pressure

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.

Note to installer:

Attach this diagram near heater.

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

Some models may have limit control

to pressure switch wire routed outside

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

of J-box.

Use 105°C wire for replacements.

5H78233C11 REV B Two-Stage, Standing Pilot, 100% Shut-Off, Single-Phase.

5

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

A

Circuit Breaker

(By Others)

L1 L2 L3

230V/60Hz/3Ø Power Shown

21

Xfmr

G

Low-Stage

24V

Power

Exhauster

3

TDC

1

Motor

230V

Therm

Two-Stage

t°

High

TD Relay

Heater

H

H

F

T1

C

t°

Low

C

T2

A

B

1

Coil

Starter

L3

L2

L1

Fan

Motor

Starter

Overload

3

TDC

TD Relay

1

TD Relay

Combination

Gas Control

Switch

Pressure

Limit

Control

2

Operator

V

BA

High-Stage

Operator

Indicated Terminal Board Connection

W

Gas Control

Combination

UNIT HEATER WIRING DIAGRAM

24V.

Line

Two-Stage

L3L2

L1

Low Volt

Therm

(By Others)

3Ø Starter

(By Others)

C

HighLow

C

W

200V/60Hz/1Ø-BK & R

Primary Xfmr Wires

* Alternate Xfmr.

F

T2

Board

Terminal

C

R

Control

Limit

T3

T2

Fan

Motor

BL

T1

BL

BR

3

T1

1

O

BK

W

G

V

Gnd

R

W

4

H

Relay

H

2

T-D

BK

BL

BL

BL

J-Box

Switch

Pressure

Wire nut the wire not used.

230V/60Hz/1Ø-BK & Y (OR O)

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.

Wiring Legend

Factory

Field

Wire Nut

230V/60Hz/3Ø Power Shown

L3

Circuit Breaker

L2

(By Others)

L1

Power

Exhaust

Motor

Xfmr* 24V

5H78233C11 REV B Two-Stage, Standing Pilot, 100% Shut-Off, Three-Phase.

6

ttach this diagram near heater.All wiring must comply with national

electric code and all local codes.

Note to installer:

All components must agree with

Some models may have limit control

to pressure switch wire routed outside

their respective power source.

of J-box.

Use 105°C wire for replacements.

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Second Circuit

Breaker Req'd.

Circuit Breaker

(By Others)

L2

(W)

L1

(BK)

115V/60Hz/1Ø Power Shown

For 230V,200V,1Ø

Power

Exhauster

3

TDC

TD Relay

1

Motor

Fan

TDC

TD Relay

Motor

4

2

115 V

Two-Stage

Xfmr

Therm

24V

t°

High

ECO

BA

High-Stage

Operator

TR

G

TD Relay

Heater

H

H

F

T1

C

Low-Stage

Gas Control

Combination

Switch

Pressure

Operator

TH

t°

Limit

Low

T2

Control

C

V

Indicates Terminal Board Connection

W

BA

R

TH T

ECO

Combination

Gas Control

ECO

Connection

Low High

(By Others)

Therm

Low Volt

Two-Stage

C

UNIT HEATER WIRING DIAGRAM

24V.

Line

Wiring Legend

Factory

Field

Wire Nut

L1(BK)

L2(W)

115V/60Hz/1Ø Power Shown

Circuit Breaker

(By Others)

Second Circuit

Limit

Control

Fan

Motor

Exhaust

Power

Breaker Req'd.

For 230V,200V,1Ø

Motor

W

F

T2

Board

Terminal

T1

R

BL

BL

W

G

V

C

R

3

1

BK

Gnd

W

4

H

H

2

T-D Relay

BK

BL

BL

XFMR

* 24V

BL

J-Box

Switch

Pressure

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.

Note to installer:

Attach this diagram near heater.

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

Some models may have limit control

to pressure switch wire routed outside

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

of J-box.

Use 105°C wire for replacements.

5H78233C12 REV A Two-Stage, Standing Pilot, 100% Shut-Off, Single-Phase.

7

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Circuit Breaker

(By Others)

L1 L2 L3

230V/60Hz/3Ø Power Shown

ECO

BA

High-Stage

Operator

Indicated Terminal Board Connection

TR

Xfmr

G

24V

230V

Coil

Starter

L3

L2

L1

Fan

Motor

Power

Exhauster

Motor

T1

C

Starter

Overload

3

TDC

TD Relay

1

3

TDC

TD Relay

1

Two-Stage

Therm

t°

High

t°

Low

TD Relay

Heater

H

H

F

T2

Gas Control

Combination

Pressure

Limit

C

Low-Stage

Operator

TH

Switch

Control

V

W

BA

TH TR

ECO

Combination

Gas Control

ECO

Connection

HighLow

Two-Stage

Low Volt

Therm

(By Others)

C

UNIT HEATER WIRING DIAGRAM

24V.

Line

L3L2

L1

3Ø Starter

(By Others)

C

Ter mi n al

R

Control

Limit

BL

T3

T2

Fan

Motor

T1

Board

F

T2

C

T1

R

BL

W

BR

4

3

H

1

H

2

BK

O

BK

BL

Wiring Legend

Factory

Field

Wire Nut

L3

L1

230V/60Hz/3Ø Power Shown

L2

Circuit Breaker

(By Others)

Power

Exhaust

Motor

* 24V

Xfmr

5H78233C12 REV A Two-Stage, Standing Pilot, 100% Shut-Off, Three-Phase.

W

G

V

Gnd

T-D Relay

BL

Switch

Pressure

BL

J-Box

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.

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

Note to installer:

Attach this diagram near heater.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105°C wire for replacements.

Some models may have limit control

to pressure switch wire routed outside

of J-box.

8

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Fan

Second Circuit

Breaker Req'd.

For 230V,200V,1Ø

Circuit Breaker

(By Others)

L2

(W)

L1

(BK)

115V/60Hz/1Ø Power Shown

Power

TD Relay

TDC

Motor

Exhaust

3

1

42

TD Relay

TDC

Motor

Xfmr

G

24V

115 V

T1

t°

Therm

TD Relay

Heater

H

Pressure

Switch

H

O

Limit

Control

F

V

T2

C

SPARK

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

SPARK

SPARK

IgnitorBKIgnitor

G

GND

GND

GND

GND

Y

W

TR(GND)

TR(GND)

24V(GND)

24V(GND)

BL

PV/MV

PV/MV

MV/PV

MV/PV

C

(MV/PV)

Pilot

Operator

Main

Operator

Combination

Gas Control

P

M

(PV)

(MV)

R

MV

MV

PV

PV

TH(24V)

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

Indicates Terminal Board Connection

2

Alternate

Combination

Gas Control

1

(By Others)

Therm

Volt

Low

UNIT HEATER WIRING DIAGRAM

Power

24V.LINE

Limit

Control

Exhaust

Motor

R

BL

Fan

Motor

Gnd

Gas Control

Combination

Alternate

BL

J-Box

PV/MV

TH TR

MV

Pressure

W

Switch

Ignitor

Ignitor

G

G

O

O

SPARK

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

K

K

SPAR

SPAR

D

GND

GND

GND

GND

D

Y

W

Y

W

TR(GND)

TR(GND)

24V(GND)

24V(GND)

BL

BL

PV/MV

PV/MV

MV/PV

MV/PV

PV

HONEYWELL ROBERTSHAW

COMBINATION GAS CONTROL

BK

R

R

MV

MV

PV

PV

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

M 1

MV

C 2

MV/PV

P 3

PV

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

W

43

PV/MV

PV

MV

W

F

d

Terminal

Boar

T2

T1

BL

W

G

V

C

R

W

4

3

H

1

H

2

T-D Relay

BK

BL

BK

BL

WIRING LEGEND

FACTO RY

FIELD

WIRE NUT

115V/60Hz/1Ø Power Shown

L2(W)

L1(BK)

Circuit Breaker

(By Others)

Second Circuit

Breaker Req'd

For 230V,200V,1Ø

* 24V

Xfmr

Note to installer:

Caution

Failure to wire this unit according

to this wiring diagram may result

in injury to the installer or user.

Attach this diagram near heater.

For deviations contact the factory.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

5H78233C10 REV A Single-Stage, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Single-Phase.

to pressure switch wire routed outside

of J-box.

9

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Starter

Coil

Motor

Power

Circuit Breaker

(By Others)

L3

L1 L2 L3

L2

L1

230V/60Hz/3Ø Power Shown

Fan

Starter

Motor

Overload

4

TD Relay

TDC

2

Exhaust

3

TD Relay

TDC

1

230V

Xfmr

Therm

24V

t°

G

T1

TD Relay

Heater

H

Pressure

Switch

H

Limit

Control

F

V

T2

C

Ignitor

Ignitor

G

G

O

O

SPARK

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

SPARK

SPARK

GND

GND

GND

GND

Y

W

Y

W

TR(GND)

TR(GND)

24V(GND)

24V(GND)

BL

BL

PV/MV

PV/MV

MV/PV

MV/PV

C

(MV/PV)

Pilot

Operator

Main

Operator

Gas Control

P

M

(PV)

(MV)

R

R

BK

MV

MV

PV

PV

TH(24V)

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

Indicates Terminal Board Connection

UNIT HEATER WIRING DIAGRAM

24V.Line

Low

Volt

Therm

(By Others)

3 Phase

L3

L2L1

Starter

(By Others)

C

T3T2T1

Alternate

Combination

Limit

Control

Fan

Motor

2

Gas Control

1

R

BL

MV

Terminal

Board

PV/MV

TH TR

W

D

D

PV

COMBINATION GAS CONTROL

M 1

MV

HONEYWELL ROBERTSHAW

C 2

MV/PV

P 3

PV

W

43

PV/MV

PV

Gas Control

Combination

Alternate

MV

Ignitor

Ignitor

W

F

T2

G

O

W

G

R

BL

Y

BK

Ignitor

V

C

T1

R

BL

W

BR

4

3

H

1

H

2

T-D Relay

BK

O

BK

BL

Pressure

Switch

BL

Gnd

x

J-Bo

BL

HONEYWELL ROBERTSHAW

HONEYWELL ROBERTSHAW

SPARK

SPARK

SPARK

SPARK

GND

GND

GND

GND

PV/MV

PV/MV

TR(GND)

TR(GND)

MV/PV

MV/PV

24V(GND)

24V(GND)

MV

MV

PV

PV

TH(24V)

TH(24V)

PV

PV

24V

24V

MV

MV

* Alternate Xfmr.

IGNITION CONTROLLERIGNITION CONTROLLER

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

Wiring Legend

Factory

Field

Wire Nut

230V/60Hz/3Ø Power Shown

Circuit Breaker

L2

L3

(By Others)

L1

Power

Exhaust

Motor

* 24V

Xfmr

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.

Note to installer:

Attach this diagram near heater.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

to pressure switch wire routed outside

of J-box.

5H78233C10 REV A Single-Stage, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Three-Phase.

10

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Fan

Second Circuit

Breaker Req'd.

For 230V,200V,1Ø

Circuit Breaker

(By Others)

L2

(W)

L1

(BK)

115V/60Hz/1Ø Power Shown

Power

Exhaust

Motor

Motor

Xfmr

G

24V

115 V

T1

Pressure

Switch

O

O

Limit

Control

SPARK

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

V

T2

C

SPARK

SPARK

Ignitor

Ignitor

G

G

GND

GND

GND

GND

Y

W

Y

W

TR(GND)

TR(GND)

24V(GND)

24V(GND)

BL

BL

PV/MV

PV/MV

MV/PV

MV/PV

C

Operator

Main

Operator

Pilot

Mechnical

Gas Control

Combination

P

M

BK

R

R

MV

MV

PV

PV

TH(24V)

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

D

Modulating

Gas Control

D

Indicates Terminal Board Connection

Combination

Gas Control

UNIT HEATER WIRING DIAGRAM

24V.LINE

Limit

Power

Control

Exhaust

Motor

R

BL

Fan

Motor

BK

1

Terminal

Board

W

2M3

C

T2

BL

BK

P

D

Modulating

Gas Control

Pressure

Switch

D

Ignitor

Ignitor

G

G

O

O

SPARK

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

SPARK

SPARK

GND

GND

GND

GND

Y

W

Y

W

TR(GND)

TR(GND)

24V(GND)

24V(GND)

BL

BL

PV/MV

PV/MV

MV/PV

MV/PV

R

R

BK

MV

MV

PV

PV

TH(24V)

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

Mechanical

R

W

F

G

V

C

T1

Gnd

J-Box

W

BKBLBL

BL

WIRING LEGEND

FACTORY

FIELD

WIRE NUT

L2(W)

L1(BK)

Second Circuit

115V/60Hz/1Ø Power Shown

Circuit Breaker

(By Others)

Breaker Req'd

* 24V

For 230V,200V,1Ø

Xfmr

Note to installer:

Caution

Failure to wire this unit according

to this wiring diagram may result

in injury to the installer or user.

Attach this diagram near heater.

For deviations contact the factory.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

to pressure switch wire routed outside

of J-box.

5H78233C5 REV B Mechanical Modulation, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Single-Phase.

11

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Starter

Circuit Breaker

(By Others)

L3

L1 L2 L3

L2

L1

230V/60Hz/3Ø Power Shown

Fan

Coil

Starter

Overload

Motor

Power

Exhaust

Motor

230V

Xfmr

24V

G

T1

Pressure

Switch

Limit

Control

V

T2

C

Ignitor

Ignitor

G

G

O

O

SPARK

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

SPARK

SPARK

GND

GND

GND

GND

Y

W

Y

W

TR(GND)

TR(GND)

24V(GND)

24V(GND)

BL

BL

PV/MV

PV/MV

MV/PV

MV/PV

C

Operator

Main

Operator

Pilot

Modulating

Mechnical

Gas Control

Combination

P

M

DD

R

R

BK

MV

MV

PV

PV

TH(24V)

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

Gas Control

Indicates Terminal Board Connection

UNIT HEATER WIRING DIAGRAM

3 Phase

Starter

(By Others)

L3

L2L1

C

BK

Y

231

P

C

M

D

Modulating

Gas Control

BL

x

J-Bo

D

Pressure

Switch

Ignitor

Ignitor

G

G

O

O

SPARK

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

SPARK

SPARK

GND

GND

GND

GND

Y

W

Y

W

TR(GND)

TR(GND)

24V(GND)

24V(GND)

BL

BL

PV/MV

PV/MV

MV/PV

MV/PV

R

R

BK

MV

MV

PV

PV

TH(24V)

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

Mechanical

R

W

BK

W

F

T2

Terminal

Board

R

Limit

Control

BL

T3T2T1

Fan

Motor

T1

BL

G

V

C

Gnd

24V.Line

O

BK

BL

BL

Wiring Legend

Factory

Field

Wire Nut

230V/60Hz/3Ø Power Shown

Circuit Breaker

(By Others)

L1

L2

L3

Power

Exhaust

Motor

* 24V

Xfmr

Caution

Failure to wire this unit according

to this wiring diagram may result

in injury to the installer or user.

Note to installer:

For deviations contact the factory.

Attach this diagram near heater.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

to pressure switch wire routed outside

of J-box.

5H78233C5 REV B Mechanical Modulation, Intermittent Pilot Ignition, 100% Shut-off with Continuous Retry, Three-Phase.

12

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Fan

Second Circuit

Breaker Req'd.

For 230V,200V,1Ø

Circuit Breaker

(By Others)

L2

(W)

L1

(BK)

115V/60Hz/1Ø Power Shown

Power

Exhaust

Motor

Motor

Xfmr

G

24V

115 V

T1

Pressure

Switch

O

O

Limit

Control

SPARK

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

V

T2

C

W

SPARK

SPARK

Ignitor

Ignitor

G

G

GND

GND

GND

GND

Y

W

Y

W

TR(GND)

TR(GND)

24V(GND)

24V(GND)

BL

BL

PV/MV

PV/MV

MV/PV

MV/PV

D

Automatic

Gas Control

Mechanical

Modulating

D

BK

R

R

MV

MV

PV

PV

TH(24V)

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

Gas Control

Indicates Terminal Board Connection

UNIT HEATER WIRING DIAGRAM

24V.LINE

Limit

Power

Control

Exhaust

Motor

R

BL

Fan

Motor

Terminal

Board

Mechanical

Modulating

Gas Control

T2

T1

BL

W

BK

F

C

BKBLBL

Y

D

D

W

G

V

Gnd

BL

J-Box

Pressure

Switch

Ignitor

Ignitor

O

O

SPARK

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

SPARK

SPARK

G

G

GND

GND

GND

GND

Y

W

Y

W

TR(GND)

TR(GND)

24V(GND)

24V(GND)

Automatic Gas

BL

BL

TH(24V)

PV/MV

PV/MV

24V

24V

MV/PV

MV/PV

Control

R

BK

R

R

MV

MV

PV

PV

PV

PV

MV

MV

IGNITION CONTROLLERIGNITION CONTROLLER

result

ording

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

T

WIRING LEGEND

FACTO RY

FIELD

WIRE NU

115V/60Hz/1Ø Power Shown

L2(W)

L1(BK)

Circuit Breaker

(By Others)

Second Circuit

Breaker Req'd

For 230V,200V,1Ø

* 24V

Xfmr

Caution

Failure to wire this unit acc

to this wiring diagram may

in injury to the installer or user.

For deviations contact the factory.

Note to installer:

Attach this diagram near heater.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

to pressure switch wire routed outside

of J-box

5H78233C4 REV A Mechanical Modulation, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Single-Phase.

13

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Starter

Circuit Breaker

(By Others)

L3

L1 L2 L3

L2

L1

230V/60Hz/3Ø Power Shown

Fan

Coil

Starter

Overload

Motor

Power

Exhaust

Motor

230V

Xfmr

24V

G

T1

Pressure

Switch

Limit

Control

V

T2

C

Ignitor

Ignitor

G

G

O

O

K

K

SPAR

SPAR

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

K

K

SPAR

SPAR

GND

GND

GND

GND

Y

W

Y

W

TR(GND)

TR(GND)

24V(GND)

24V(GND)

BL

BL

PV/MV

PV/MV

MV/PV

MV/PV

D

Automatic

Gas Control

Mechanical

Modulating

Gas Control

D

BK

R

R

MV

MV

PV

PV

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

Indicates Terminal Board Connection

UNIT HEATER WIRING DIAGRAM

3 Phase

Starter

(By Others)

L3L2

C

L1

Mechanical

Modulating

Gas Control

Limit

T3T2T1

Control

Fan

Motor

W

Y

D

D

W

Automatic Gas

Control

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

IgnitorBKIgnitor

Pressure

Switch

F

T2

Ter mi n al

Board

R

BL

T1

BL

G

R

BL

Y

W

G

O

V

C

BL

Gnd

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

x

J-Bo

SPARK

SPARK

SPARK

SPARK

GND

GND

GND

GND

PV/MV

PV/MV

TR(GND)

TR(GND)

(GND)

(GND)

MV/PV

MV/PV

24V

24V

MV

MV

PV

PV

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

24V.Line

Wiring Legend

Factory

Field

Wire Nut

230V/60Hz/3Ø Power Shown

Circuit Breaker

L2

L3

(By Others)

L1

Power

Exhaust

Motor

BK

O

BK

BL

BL

* 24V

Xfmr

Caution

Failure to wire this unit according

to this wiring diagram may result

in injury to the installer or user.

Note to installer:

For deviations contact the factory.

Attach this diagram near heater.

All wiring must comply with national

electric code and all local codes.

All components must agree with

5H78233C4 REV A Mechanical Modulation, Intermittent Pilot Ignition, 100% Shut-Off with Continuous
Retry, Three-Phase.

14

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

to pressure switch wire routed outside

of J-box.

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Fan

Second Circuit

Breaker Req'd.

For 230V,200V,1Ø

Circuit Breaker

(By Others)

L2

(W)

L1

(BK)

115V/60Hz/1Ø Power Shown

Power

Exhaust

3

TD Relay

TDC

1

Motor

42

TD Relay

TDC

Motor

115 V

Two-Stage

Xfmr

Therm

24V

t°

High

G

T1

C

t°

Low

TD Relay

Heater

H

H

Pressure

Switch

F

Limit

Control

V

T2

C

Ignitor

Ignitor

GWYBLR

O

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

SPARK

SPARK

GND

GND

GND

PV/MV

TR(GND)

MV/PV

MV/PV

24V(GND)

24V(GND)

3

Operator

High-Stage

2

Operator

Low-Stage

Operator

Pilot

1

4

BK

MV

MV

PV

PV

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

Indicates Terminal Board Connection

Low High

Two-Stage

Low Volt

Therm

(By Others)

C

R

Limit

Control

Exhaust

Motor

BL

Fan

Motor

UNIT HEATER WIRING DIAGRAM

Power

LINE 24V.

Terminal

Board

Alternate

Combination

Gas Control

T2

T1

R

BL

W

Combination

Gas Control

Pressure

Switch

O

SPARK

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

SPARK

SPARK

2

43

1

Ignitor

Ignitor

GWYBLR

GND

GND

TR(GND)

TR(GND)

GND

GND

24V(GND)

24V(GND)

PV/MV

PV/MV

MV/PV

MV/PV

Y

R

BK

MV

MV

PV

PV

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

* Alternate Xfmr

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

M

C

P

HI

PV

MV

PV/MV

Therm

"High"

W

F

G

V

C

Gnd

BL

J-Box

W

4

3

H

1

H

2

T-D RE LAY

BK

BL

BK

BL

WIRING LEGEND

FACTORY

FIELD

WIRE NUT

115V/60Hz/1Ø Power Shown

L2(W)

L1(BK)

Circuit Breaker

(By Others)

Second Circuit

Breaker Req'd

For 230V,200V,1Ø

* 24V

Xfmr

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.

5H78233C2 REV A Two-Stage, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry,
Single-Phase.

Note to installer:

Attach this diagram near heater.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Some models may have limit control

to pressure switch wire routed outside

of J-box.

Use 105° wire for replacements.

15

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

L1 L2 L3

eaker

Circuit Br

(By Others)

L3

L2

L1

Starter

Fan

Coil

Motor

Power

Exhaust

Motor

230V

Xfmr

24V

G

H

TD Relay

Heater

H

T1

Pressure

Switch

Ignitor

Ignitor

Pilot

4

High-Stage

Operator

3

Operator

2

Low-Stage

Operator

1

Starter

Overload

4

TDC

Two-Stage

Low Volt

3 Phase

L3

L1 L2

TD Relay

Therm

(By Others)

Starter

(By Others)

C

2

Low High

C

230V/60Hz/3Ø Power Shown

UNIT HEATER WIRING DIAGRAM

Line 24V.

TD Relay

Alternate

T1 T2 T3

3

TDC

1

P

Combination

Gas Control

PV

Limit

Control

Fan

Motor

M

MV

R

BL

C

PV/MV

Therm

HI

Two-Stage

"High"

Terminal

Board

T2

BL

Therm

T1

BR

BK

t°

O

High

F

3

1

C

t°

Low

W

G

W

G

O

O

F

Limit

Control

GND

GND

SPARK

V

T2

C

2

43

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

SPARK

SPARK

Y

GND

GND

Y

Y

PV/MV

PV/MV

TR(GND)

TR(GND)

MV/PV

MV/PV

24V(GND)

24V(GND)

R

BL

R

BL

GY

MV

MV

PV

PV

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

Indicates Terminal Board Connection

R

1

Combination

Gas Control

W

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Ignitor

Ignitor

Pressure

Switch

G

BK

R

BL

Y

W

G

W

G

O

O

V

C

BL

Gnd

R

W

4

2

BK

BL

J-Box

H

H

T-D Relay

BL

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

SPARK

SPARK

SPARK

SPARK

GND

GND

GND

GND

Y

PV/MV

PV/MV

TR(GND)

TR(GND)

MV/PV

MV/PV

24V(GND)

24V(GND)

R

BL

MV

MV

PV

PV

TH(24V)

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

Wire nut the wire not used.

Wiring Legend

Factory

Field

Wire Nut

L3L2L1

230V/60Hz/3Ø Power Shown

Circuit Breaker

(By Others)

Power

Exhaust

Motor

* 24V

Xfmr

Caution

Failure to wire this unit according

to this wiring diagram may result

in injury to the installer or user.

Note to installer:

For deviations contact the factory.

Attach this diagram near heater.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

5H78233C2 REV A Two-Stage, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Three-Phase.

16

to pressure switch wire routed outside

of J-box.

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Xfmr

230V

Therm

Circuit Breaker

(By Others)

L1 L2 L3

460V/60Hz/3ØPower Shown

Starter

230V

X2 X3

Coil

O.L.C.

TD Relay

TDC

r

Power

Moto

Exhaust

TD Relay

TDC

31

4

2

Xfmr

X1

H4

H2H3

460V

H1

Fan

L1 L2 L3

Motor

X4

24V

t°

TR

TH

Combination

Gas

G

Control

T1

H

H

TD Relay

Heater

Pressure

Switch

Limit

Control

F

Indicates Terminal Board Connection

V

T2

C

To

Starter

Coil

Xfmr

To L 2

H2

X3

To 24V Xfmr "O or R"

575V

230V

X2

H1

X4 X1

To L 1

Alternate Wiring For Entrance J-Box

575V Transformer

BK Y

To 24V Xfmr "BK"

L3

UNIT HEATER WIRING DIAGRAM

L1 L2

Line 24V.

ng Legend

Wiri

Factory

Field

Wire Nut

L2L1L3

460V/60Hz/3Ø Power Shown

Circuit Breaker

(By Others)

3 Phase

Starter

(By Others)

C

460V

2

1

Alternate

Combination

Gas Control

Terminal

Board "G"

Pressure

Low

Volt

Therm

(By Others)

R

4

2

Xfmr

W

G

V

W

H

H

T-D Relay

BL

BL

Pressure

J-Box

Switch

Combination

Gas Control

Gnd

Fan

Motor

Terminal

T1 T2 T3

Limit

Control

X1

X4

Power

230V

X2 X3

Exhaust

Motor

R

Y

BK

H4

H2H3

Xfmr

H1

Board

F

T2

C

R

BL

T1

BL

R

3

1

BK

OR

R

24V

Switch

W

BL

TR

TH

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.

Note to installer:

Attach this diagram near heater.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

to pressure switch wire routed outside

of J-box.

5H78233B8 Single-Stage, Standing Pilot, 100% Shut-Off, Three-Phase.

17

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

TR

Circuit Breaker

(By Others)

L1 L2 L3

Alternate Wiring For Entrance J-Box

L1 L2 L3

460V/60Hz/3ØPower Shown

To L 2

H2

575V

H1

To L 1

575V Transformer

Xfmr

To

Starter

X3

230V

X2

X4 X1

Coil

BK Y

To 24V Xfmr "O or R"

To 24V Xfmr "BK"

Fan

Motor

Xfmr

230V

24V

t°

Therm

Ter m in a l

Board "G"

G

Combination

Gas

T1

H

H

TD Relay

Heater

Pressure

F

T2

460V

Starter

230V

X2 X3

Coil

O.L.C.

TD Relay

TDC

Power

Exhaust

Motor

TD Relay

TDC

31

Board "G"

Ter m in a l

4

2

Xfmr

X1

H4

H2H3

H1

X4

TR

Gas Control

Combination

Alternate

Low

Volt

Therm

(By Others)

ECO

Connections

ECO

TH

Pressure

Switch

Gas Control

Combination

Alternate

Control

Switch

Limit

TH

Control

V

C

TR

TH

ECO

ECO

ns

Connectio

ECO

Switch

Pressure

Indicates Terminal Board Connection

3 Phase

Starter

(By Others)

L3

UNIT HEATER WIRING DIAGRAM

Line 24V.

ng Legend

Wiri

Factory

Field

Wire Nut

L2L1L3

460V/60Hz/3Ø Power Shown

Circuit Breaker

(By Others)

C

L1 L2

460V

H4

H2H3

Xfmr

H1

X1

X4

Power

230V

X2 X3

Exhaust

Motor

Fan

Motor

Terminal

T1 T2 T3

Limit

Control

R

Y

BK

Board

F

T2

R

BL

T1

BL

R

OR

G

V

C

Gnd

R

W

4

3

1

2

BK

BL

R

24V

Xfmr

J-Box

H

H

T-D Relay

BL

Pressure

Switch

Caution

Failure to wire this unit according

TH TR

Gas Control

Combination

Note to installer:

to this wiring diagram may result

in injury to the installer or user.

For deviations contact the factory.

5H78233B9 Single-Stage, Standing Pilot Ignition, 100% Shut-Off, Three-Phase.

ECO

Connection

ECO

Attach this diagram near heater.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

to pressure switch wire routed outside

of J-box.

18

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Xfmr

230V

24V

G

T1

H

Pressure

H

TD Relay

Heater

Limit

Circuit Breaker

L1 L2 L3

(By Others)

Starter

Coil

Xfmr

X1

H4

H2H3

460V

H1

Fan

L1 L2 L3

Motor

O.L.C.

230V

X2 X3

X4

Power

Exhaust

Motor

Switch

Control

Ignitor

GWYBLR

O

C

(MV/PV)

Operator

Main

Operator

Pilot

Gas Control

Combination

P

M

(PV)

(MV)

Indicates Terminal Board Connection

W

BK

460V/60Hz/3ØPower Shown

To

Starter

Coil

Xfmr

To L 2

H2

X3

To 24V Xfmr "O or R"

575V

230V

X2

H1

X4 X1

To L 1

Alternate Wiring For Entrance J-Box

575V Transformer

UNIT HEATER WIRING DIAGRAM

BK Y

3 Phase

L3

L1 L2

To 24V Xfmr "BK"

Starter

(By Others)

C

Alternate

Combination

Gas Control

Low

T1 T2 T3

Volt

PV/MV

MV

(By Others)

Therm

Fan

TD Relay

TH TR

Motor

TDC

W

t°

31

4

TD Relay

TDC

2

Therm

Alternate

PV

D

D

W

Terminal

Board

F

T2

G

2

Gas Control

Combination

1

F

MV

PV/MV

MV/PV

MV/PV

1

M

PV

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

2

C

P3

GND

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

V

C

T2

SPARK

SPARK

GND

GND

TR(GND)

24V(GND)

24V(GND)

W

43

PV/MV

PV

MV

Pressure

Switch

Ignitor

Ignitor

GWYBLR

O

MV

HONEYWELL ROBERTSHAW

COMBINATION GAS CONTROL

MV/PV

BK

PV

T1

BL

R

W

R

4

3

H

1

H

2

BK

BL

OR

R

24V

Xfmr

Gnd

T-D Relay

BL

J-Box

BL

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

Caution

Failure to wire this unit according

to this wiring diagram may result

GND

GND

SPARK

SPARK

SPARK

SPARK

in injury to the installer or user.

For deviations contact the factory.

PV/MV

PV/MV

TR(GND)

TR(GND)

GND

GND

MV/PV

MV/PV

24V(GND)

24V(GND)

Note to installer:

Attach this diagram near heater.

All wiring must comply with national

MV

MV

PV

PV

TH(24V)

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

electric code and all local codes.

All components must agree with

their respective power source.

Use 105° wire for replacements.

Some models may have limit control

to pressure switch wire routed outside

Line 24V.

ng Legend

Wiri

Factory

Field

Wire Nut

L2L1L3

460V/60Hz/3Ø Power Shown

Circuit Breaker

(By Others)

460V

R

Limit

Control

BL

X1

X4

Power

230V

X2 X3

Exhaust

Motor

R

Y

BK

H4

H2H3

Xfmr

H1

V

C

5H78233B1 REV A Single-Stage, Intermittent Pilot, 100% Shut-Off, with Continuous Retry Three-Phase.

of J-box.

19

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Second Circuit

Breaker Req'd.

For 230V,200V,1Ø

Circuit Breaker

(By Others)

L2

(W)

L1

(BK)

115V/60Hz/1Ø Power Shown

Power

Exhauster

3

TDC

TD Relay

1

Motor

Fan

4

TDC

TD Relay

Therm

Motor

2

"High"

Xfmr

G

24V

115 V

T1

C

t°

Two-Stage

Therm

High

W

W

t°

Low

TD Relay

Heater

H

Pressure

Switch

H

F

Limit

Control

V

T2

C

Ignitor

Ignitor

G

G

O

O

SPARK

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

SPARK

SPARK

GND

GND

GND

GND

W

Y

W

Y

W

TR(GND)

TR(GND)

24V(GND)

24V(GND)

B

A

BL

BL

PV/MV

PV/MV

MV/PV

MV/PV

A

Hi-Stage

Operator

B

C

Operator

Lo-Stage

Operator

Pilot

M

P

R

R

BK

MV

MV

PV

PV

TH(24V)

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

Indicates Terminal Board Connection

Alternate

Combination

Gas Control

Low High

Two-Stage

Low Volt

Therm

(By Others)

C

UNIT HEATER WIRING DIAGRAM

R

Limit

Control

BL

Fan

Motor

24V.

Power

Exhaust

Motor

BA

T2

Terminal

Board

BL

TH TR

MV

T1

P

M

C

PV/MV

BL

J-Box

PV

Switch

Pressure

D

D

W

F

G

V

C

R

1

Gnd

W

4

H

3

H

2

T-D RE LAY

BK

Combination

Gas Control

Ignitor

Ignitor

G

O

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

SPARK

SPARK

GND

GND

GND

Y

Y

W

TR(GND)

24V(GND)

24V(GND)

BL

PV/MV

MV/PV

MV/PV

R

BK

BK

R

PV

MV

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

BL

BK

Line

Wiring Legend

Factory

Field

Wire Nut

L2(W)

L1(BK)

Second Circuit

115V/60Hz/1Ø Power Shown

Circuit Breaker

(By Others)

Breaker Req'd

For 230V,200V,1Ø

W

* 24V

Xfmr

BL

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.

Note to installer:

Attach this diagram near heater.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105°C wire for replacements.

Some models may have limit control

5H78233C3 REV A Two-Stage, Intermittent Pilot Ignition, 100% Shut-Off, with Continuous Retry, Single-Phase.

20

to pressure switch wire routed outside

of J-box.

6-446 — WIRING DIAGRAMS MODELS PDP/BDP

Motor

Fan

TD Relay

Therm

"High"

TDC

W

Motor

4

2

230V

Two-Stage

W

Xfmr

Therm

24V

t°

High

C

t°

Low

TD Relay

Heater

H

Pressure

Switch

H

F

Limit

Control

V

T2

C

G

T1

Circuit Breaker

(By Others)

L3

L1 L2 L3

L2

L1

230V/60Hz/3Ø Power Shown

Fan

Motor

TD Relay

Power

Exhauster

3

TDC

1

Ignitor

Ignitor

G

G

O

O

SPARK

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

K

K

SPAR

SPAR

GND

GND

GND

GND

W

W

TR(GND)

TR(GND)

24V(GND)

24V(GND)

W

Y

Y

PV/MV

PV/MV

MV/PV

MV/PV

B

A

A

Hi-Stage

Operator

B

C

Lo-Stage

Operator

Operator

Pilot

P

M

R

BL

R

BL

BK

MV

MV

PV

PV

TH(24V)

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

Indicates Terminal Board Connection

UNIT HEATER WIRING DIAGRAM

24V.

Alternate

Combination

Therm

Low Volt

Two-Stage

3Ø Starter

L3L2

C

L1

AB

Gas Control

HighLow

(By Others)

C

(By Others)

P

C

M

TH TR

PV/MV

MV

Limit

Control

T3

Fan

Motor

T2

T1

D

D

Board

Terminal

T2

R

BL

T1

BL

PV

W

F

G

V

C

BL

Gnd

R

W

BR

4

3

1

2

BK

O

BK

BL

J-Box

H

H

T-D Relay

BL

Combination

Gas Control

Switch

Pressure

O

O

SPARK

SPARK

ROBERTSHAWHONEYWELL

ROBERTSHAWHONEYWELL

SPARK

SPARK

BKYR

Ignitor

Ignitor

G

G

GND

GND

GND

GND

Y

W

Y

W

TR(GND)

TR(GND)

24V(GND)

24V(GND)

BL

BL

PV/MV

PV/MV

MV/PV

MV/PV

R

R

BK

MV

MV

PV

PV

TH(24V)

PV

PV

MV

MV

24V

24V

IGNITION CONTROLLERIGNITION CONTROLLER

Line

Xfmr

Wiring Legend

Factory

Field

Wire Nut

L3

L1

L2

230V/60Hz/3Ø Power Shown

Circuit Breaker

(By Others)

Power

Motor

Exhaust

* 24V

* Alternate Xfmr.

Primary Xfmr Wires

230V/60Hz/1Ø-BK & Y (OR O)

200V/60Hz/1Ø-BK & R

Wire nut the wire not used.

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.

Note to installer:

Attach this diagram near heater.

All wiring must comply with national

electric code and all local codes.

All components must agree with

their respective power source.

Use 105°C wire for replacements.

5H78233C3 REV A Two-Stage, Intermittent Pilot Ignition, 100% Shut-Off, with Continuous Retry, Three-Phase.

Some models may have limit control

to pressure switch wire routed outside

of J-box.

21

6-446 — WIRING INSTRUCTIONS FOR ENERGY SAVER CONTROL

Before proceeding with wiring the accessories described,

CAUTION

Turn off all power and gas to unit before wiring. Failure to
wire this unit according to this wiring diagram may result in
injury to the installer or user. For deviations, contact factory.

make sure the unit has been installed, vented piped and wired
according to the Installation/Service Manual and Standard Wiring
Diagram furnished with the unit heater.

Installation

All wiring for this control must comply with the National Electric
Code and all local codes and ordinances.

Do not locate control on an outside wall or where it will be
affected by drafts or radiant heat. It does not require level
mounting.

1. Remove front cover and one wiring access knockout from
control.

2. Attach control to mounting surface with three screws
through back of case. Use a wooden shim for insulation if
surface is metal or masonry.

3. Thread two wires through knockout and connect to R and W
control terminals. Leads must be long enough to extend to
unit heater junction box.

4. Disconnect power to unit heater and open junction box on
unit heater. Select correct wiring diagram for unit heater
model (and size if applicable) and complete wiring of control
to unit.

Operational Check

1. Set room thermostat to its lowest setting and restore power
supply to unit heater.

2. Familiarize yourself with the adjustment knob of the energy­saver control. In step 5 you will want to set it at 3-6 degrees
(approximately) above the thermostat, but for now, turning
the dial clockwise to a lower setting simulates a rise in
temperature and only the unit heater fan should come on. If
the wiring is correct, the controlled equipment will switch on
and off as the temperature dial indicates the approximate
space temperature.

3. If the controlled equipment does not start and stop as the
thermostat dial is turned, disconnect the power supply and
check the wiring and terminal connections.

4. If the controlled equipment operates opposite to the
sequence desired, shut off the power and check for
reversed leads on the switch.

5. After checkout, reset room thermostat to desired comfort
level. Set energy-saver control 3 to 6 degrees above
room thermostat (depending on mounting height, room
conditions, etc.) for ceiling air circulation.

Gravity Vented, Propeller and Blower Models – (Single and Three Phase)

W

R

B

From power supply

TD Relay

TDC

1

3

WIRING INSTRUCTIONS:

1. Turn off power to unit heater.

2. Connect “R” of Energy Saver to
terminal 1 of time delay relay.

3. Connect “W” of Energy Saver to
terminal 3 of time delay relay.

4. Follow operational check
sequences on prior page.

(on units with 1Ø power supply this

To XFMR

is fan motor or on units with 3Ø
power supply this is the starter coil)

Power Exhausted, Propeller and Blower Models – (Single and Three Phase)

WRB

C-1

From power supply

TD Relay

TDC

2

To XFMR

4

(on units with 1Ø power supply this
is fan motor or on units with 3Ø
power supply this is the starter coil)

WIRING INSTRUCTIONS:

1. Turn off power to unit heater.

2. Connect “R” of Energy Saver to
terminal 2 of time delay relay.

3. Connect “W” of Energy Saver to
terminal 4 of time delay relay.

4. Follow operational check
sequences on prior page.

6-446 — MODELS PDP/BDP TYPICAL SUMMER/WINTER SWITCH WIRING

Before proceeding with wiring the accessories described,

CAUTION

Turn off all power and gas to unit before wiring. Failure to
wire this unit according to this wiring diagram may result in
injury to the installer or user. For deviations, contact factory.

make sure the unit has been installed, vented piped and wired
according to the Installation/Service Manual and Standard Wiring
Diagram furnished with the unit heater.

TD Relay

Terminals In Unit

J-Box

4

BK

Summer/
Winter Switch

Terminal

Board

On J-Box

To Thermostat

2

T1

C

V

T2

F

G

Blue

or

Red

Figure 1

To Combination
Gas Control or
Ignition Control

Typical Wiring – Summer/Winter Switch (Modine # 78727)

(24v Thermostat, 115v or 200/230v Summer/Winter Switch)

1. Turn off gas and power supply to unit.

2. Determine which method of summer/winter control is desired, Figure 1, 2 or 3.

3. Wire unit according to the method selected. Note: If the method selected is as

described in Figure 3, the factory supplied buss bar between terminals "T2"
and "F" must be removed prior to wiring in thermostat and subbase.

4. Check wiring using the Check-Out Procedure.

Check-Out Procedure

With the power and gas supply turned off, set the thermostat to its lowest setting and
place the summer/winter switch to the winter position. After making these adjustments

Robertshaw
CM260 T-Stat
w/ Subbase

Fan

On

Off

System

R

G

Auto

W

Auto

proceed as follows:

1. Turn on gas and power supply to the unit. Nothing should happen.

Relay By Others

(24v Relay Coil,

Line Volt Contact)

Terminal

Board

On J-Box

T1

C

V

T2

F

G

Relay

Lead of Power

TD RelayTer minal

3

In J-Box

To Combination
Gas Control or
Ignition Control

Wire to Hot

Exhauster

Motor

Figure 3

Alternate Wiring Using Robertshaw CM260

Thermostat w/SB-3A-1 Subbase

(25v Thermostat and Subbase)

(Modine #79187 and #78785 respectively)

2. Place the summer/winter switch in the summer position. The fan motor should start,
except when wired as shown in Figure 3. In that case, after a delay of
30 to 90 seconds, the fan motor should start.

3. While the summer/winter switch is still in the summer position, and with the fan motor
running, turn the thermostat up to call for heat. The power exhauster motor should
come on, the pressure switch should close, and the main burner should fire. Allow
burner to fire for 1 to 2 minutes.

4. Turn the thermostat down again. The main burner should shut off and the fan motor
should continue to run. During this step, allow the fan to run at least 90 seconds to
make sure it will continue running. Modine units are equipped with a time delay relay
and the motor will run 30 to 90 seconds after the time delay relay has been de­energized.

5. After insuring that the fan motor will continue to run in the summer position, and with
the thermostat set to its lowest setting, place the summer/winter switch in the winter
position and wait for the time delay relay to turn the fan motor off.

6. After the fan motor has stopped, and with the summer/winter switch in the winter
position, turn the thermostat up to call for heat. The power exhauster motor should
come on, the pressure switch should close, the main burner should fire and after a
delay of 30 to 90 seconds, the fan motor should run.

If the above sequence of operation does not occur, recheck all wiring until the
necessary correction to the wiring is found and corrected. Set the thermostat to the
desired set point and place summer/winter switch in desired position. Unit is now ready
for use.

To thermostat

Terminal

Board

On J-Box

Summer/Winter Switch

T1

C

V

T2

F

G

To Combination
Gas Control or
Ignition Control

Relay By Others
(24v Relay Coil,
Line Volt Contacts)

2

Relay

TD Relay Terminals

In J-Box

Figure 2

Typical Wiring – Summer/Winter Switch (Modine # 78727)

(24v Thermostat, 24v Summer/Winter Switch)

4

C-2

For SERVICE contact your local qualified installation and service contractor or appropriate utility company

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

Commercial HVAC

&R Division • Modine Manufacturing Company • 1500 DeKoven Avenue • Racine, Wisconsin 53403-2552

Tel: [phone] (HEAT) • www.modine.com

© Modine Manufacturing Company 2005

4/05 - Litho in USA