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WIRING
Terminal Designations
C
24 VAC Common
O
Heat pump reversing valve energized
In cooling
B
Heat pump reversing valve energized
in heating
W
Heat relay Stage 1
W2
Heat relay Stage 2
RH
24 VAC power for heating
RC
24 VAC power for cooling
G
Fan relay
Y
Compressor relay Stage 1
Y2
Compressor relay Stage 2
Notes
Wire specifications
Use 18- to 22-gauge thermostat wire.
Shielded wire is not required.
10
Common wire
The C (common wire) is optional when
the thermostat is powered by batteries.
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