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WIRING DIAGRAM
Neutral
Unused
Heat
Blower
Motor
Cool
Fault
Code
Retrieval
Code LED
MAIN HARNESS
12 PIN CONNECTOR
1.
HIGH LIMIT OUTPUT
FLAME SENSOR
2.
24 VAC TRANSFORMER, LOW VOLTAGE HIGH SIDE
3.
4.
NOT USED
5.
NOT USED
6.
24 VAC TRANSFORMER, LOW VOLTAGE COMMON
7.
HIGH LIMIT INPUT
8.
GROUND - MUST BE ATTACHED TO CHASSIS
9.
GAS VALVE COMMON
10.
PRESSURE SWITCH INPUT
11.
NOT USED
12.
GAS VALVE
2
EAC
(120V)
HOT
(LINE)
Dipswitch
COOL "OFF" DELAY
HEAT "OFF" DELAY
Status
INDUCER / IGNITOR
4 PIN CONNECTOR
1.
INDUCER HOT SIDE
IGNITOR HOT SIDE
2.
INDUCER NEUTRAL SIDE
3.
4.
IGNITOR NEUTRAL SIDE
HUM (120V)
Inducer
Motor
1
2
3
4
Fuse
3
2
1
6
5
4
9
8
7
12
11
10
Gas
Valve
LEGEND
Low Voltage (24 VAC)
Line Voltage (120 VAC)
Normally closed switch
N. C. =
N. O. = Normally open switch
120 VAC
TH
24 VAC TR
24 VAC CLASS II
TRANSFORMER
NEUTRAL
(LINE)
Ignitor
Twinning
Terminal
Flame
Sensor
High
Aux. High
Limit
Limit (N.C.)
Rollout
(N.C.)
Switch
Pressure Switch
(N.O.)
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