22
UNIT WIRING
Figure 22.1
Unit Heater Wiring Diagram (Series 103)
5H78166B REV
from Lockout, Single-Phase.
Single-Stage, Hot Surface Ignition, 100% Shut-Off, Multiple Retry with Auto Reset
unit polarity.
Verify the power source and the
Use 105˚C wire for replacements.
For deviations contact the factory.
in injury to the installer or user.
Combination
Gas Control
Hot Surface
Igniter
Power
Exhaust
Motor
Combination
Gas Control
Flame
Sensor
Pressure
Switch
COM
R
H
H
L2
L1
R
GR(G)
Y
Y
Y
R
BK
BK
W
W
BK
XFMR
Press
Switch
Fan
Motor
Flame
Rollout
Switch
Limit
Control
Flame
Sensor
BL
W
BK
W
BK
P
Plug
BK
Hot
Surface
Igniter
O
R
R
W
Plug
Power
Exhaust
Motor
W
BK
Honeywell
Combination
Gas Control
R
R
24V
115V
Xfmr
L2
(W)
L1
(BK)
Low Volt
Therm
(By
Others)
Wiring Legend
Line
24V
Factory
Field
Wire Nut
Caution
Failure to wire this unit according
to this wiring diagram may result
Note to installer:
All wiring must comply with national
electric code and all local codes.
All components must agree with
their respective power source.
Combination Gas Control
Circuit Breaker
(By Others)
Therm
t˚
TD Relay
Fan
Motor
TDC
UNIT HEATER WIRING DIAGRAM
Flame
Rollout
Switch
Indicates Terminal Board Connection
Limit
Control
24VAC
W
115V/60Hz/1Ø Power
Shown
115V/60Hz/1Ø Power
Circuit Breaker (By Others)
L1(BK)
L2(W)
R
Flame
Rollout
Switch
R
R
G
TR1
TR2
Flame
Rollout
Switch
24V
120V
COM
C3
C2
C1
ON
OFF
W
R
TD
Relay
24 VAC
TR2
TR1
BK
G
COM
G2
XFMR L2
XFMR L1
W
BK
BK
