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ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse
or switching the appropriate circuit breaker to the Off position before removing the existing
thermostat.
1. Turn off power to the heating and cooling system by removing the fuse or switching off the appropriate
circuit breaker.
2. Remove cover of old thermostat. This should expose the wires.
3. Label the existing wires with the enclosed wire labels before removing wires. See table below for old
and new label identification.
4. After labeling wires, remove wires from wire terminals.
5. Remove existing thermostat base from wall.
6. Refer to the following section for instructions on how to install this thermostat.
Replace the old labels with the enclosed new labels:
Old New Type
R, V-VR or VR-R R 24 VAC, return
Y, Y1 or M Y1 Stage 1 cooling/heating circuit
O or R O Reversing valve (cooling active)
B B Reversing valve (heat active)
G or F G Fan contactor circuit
W1, W2 or W-U W2 2nd stage heating circuit
E E Emergency heating circuit
C, X or B C 24 VAC, transformer common side
Replacing Wiring Labels
To Remove Existing Thermostat
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