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TYPICAL SINGLE-STAGE
HEAT PUMP WIRING
Figure 12
110
GYWRHBORC
COMP
FAN
24 VAC HEAT
TRANSFORMER
CHG.
OVER
ADD
JUMPER
BETWEEN
Y & W
ALT.
110
TYPICAL COOLING AND
HEATING SYSTEM
(5-WIRE)
FAN
COOL
COMP
GAS
VALVE
24 VAC HEAT
TRANSFORMER
110
Figure 11
24 VAC COOL
TRANSFORMER
REMOVE
JUMPER
BETWEEN
RH & RC
GYWRH RCOB
TYPICAL COOLING AND
HEATING SYSTEM
(4-WIRE)
Figure 10
110
GAS
VALVE
COOL
COMP
FAN
24 VAC HEAT
TRANSFORMER
GYWRH RCOB
TYPICAL HOOKUP FOR 3-WIRE
HEAT SYSTEM IF THIRD
WIRE IS FAN WIRE
Figure 9
GAS
VALVE
110
FAN
24 VAC
TRANSFORMER
GYWRH RCOB
TYPICAL HOOKUP FOR 2-WIRE
24V HEATING SYSTEM AND
MILLIVOLT SYSTEM
Figure 8
GAS
VALVE
110
24 VAC
TRANSFORMER
OR
THERMOPILE
GYWRH RCOB
These diagrams below are provided for new installations or unreferenced wires.
NOTE
If you have an electric system and the blower does not operate after installation, find the factory installed
yellow wire currently attached to the “Y” terminal and move it to the “A” terminal on the sub-base.