To Remove Existing Thermostat; Replacing Wiring Labels - ICM Controls SC2201 Installation, Operation & Application Manual

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:


To Remove Existing Thermostat

Replacing Wiring Labels

Old New
R, V-VR or VR-R
Y, Y1 or M
O or R
B
G or F
W1, W2 or W-U
E
C, X or B
R 24 VAC, return
Y1 Stage 1 cooling/heating circuit
O Reversing valve (cooling active)
B Reversing valve (heat active)
G Fan contactor circuit
W2 2nd stage heating circuit
E Emergency heating circuit
C 24 VAC, transformer common side
Type