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TYPICAL WIRING
1F80-0224/1F86-0244
1F80-0261/1F87-0261
TYPICAL WIRING DIAGRAMS
R C
24 VAC 120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Typical wiring diagram for single transformer single stage systems
TRANSFORMER
(Class II Current Limited)
Changeover
Relay*
Y O/B
Compressor
Contactor
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
Heat Relay
Fan
Relay Optional
Optional Jumper for
Single Stage Heat Pump
R C
24 VAC 120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Typical wiring diagram for two transformer single stage systems with NO safety circuits
TRANSFORMER
(Class II Current Limited)
Changeover
Relay*
Y O/B
Compressor
Contactor
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
Heat Relay
Fan
Relay Optional
Limit or
Safety
Switches
TWO COMMONS MUST
BE JUMPERED TOGETHER!
HOT
NEUTRAL
120 VAC 24 VAC
CUT AND
TAPE OFF!
If safety circuits are in
only one of the systems,
remove the transformer
of the system with NO
safety circuits.
NOTE
Optional Jumper for
Single Stage Heat Pump
155
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