Wiring Guide
6-446 — WIRING DIAGRAMS MODELS PDP/BDP
16
5H78233C2 REV A Two-Stage, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Three-Phase.
UNIT HEATER WIRING DIAGRAM
Power
Exhaust
Motor
2
4
H
H
T-D Relay
3
1
R
Gnd
Limit
Control
BL
R
T1
T2
C
F
V
G
BL
BL
BL
BK
O
W
Terminal
Board
J-Box
BL
T1 T2 T3
Fan
Motor
L1 L2
L3
C
Wiring Legend
Line 24V.
Factory
Field
Wire Nut
BK
BR
L3
L2
L1
230V/60Hz/3Ø Power Shown
Circuit Breaker
(By Others)
W
TD Relay
L3
L2
L1
Circuit Br
eaker
(By Others)
L1 L2 L3
Starter
Coil
Starter
Overload
4
2
TDC
Indicates Terminal Board Connection
Fan
Motor
230V/60Hz/3Ø Power Shown
TD Relay
Heater
H
H
Limit
Control
T2
F
C
Two-Stage
Therm
t°
t°
High
Low
C
T1
G
Xfmr
230V
24V
V
Pressure
Switch
Combination
Gas Control
2
1
43
* 24V
Xfmr
3 Phase
Starter
(By Others)
* 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° wire for replacements.
Two-Stage
Low Volt
Therm
(By Others)
Low High
C
1
3
Power
Exhaust
Motor
Y
R
TD Relay
TDC
4
Pilot
Operator
1
Low-Stage
Operator
2
High-Stage
Operator
3
Pressure
Switch
R
BL
Y
W
G
O
Ignitor
GY
R
BL
Y
W
G
O
Ignitor
R
BL
Y
W
G
O
Ignitor
BK
R
BL
Y
W
G
O
ROBERTSHAWHONEYWELL
MV
MV
SPARK
24V
PV
MV/PV
24V(GND)
GND
PV
SPARK
PV/MV
TR(GND)
GND
ROBERTSHAWHONEYWELL
MV
MV
SPARK
24V
PV
MV/PV
24V(GND)
GND
TH(24V)
PV
SPARK
PV/MV
TR(GND)
GND
ROBERTSHAWHONEYWELL
MV
MV
SPARK
24V
PV
MV/PV
24V(GND)
GND
TH(24V)
PV
SPARK
PV/MV
TR(GND)
GND
ROBERTSHAWHONEYWELL
MV
MV
SPARK
24V
PV
MV/PV
24V(GND)
GND
TH(24V)
PV
SPARK
PV/MV
TR(GND)
GND
Ignitor
IGNITION CONTROLLERIGNITION CONTROLLER
IGNITION CONTROLLERIGNITION CONTROLLER
P
M
C
HI
Alternate
Combination
Gas Control
PV
MV
PV/MV
Therm
"High"
Some models may have limit control
to pressure switch wire routed outside
of J-box.