5
STEP 1. REMOVE THE COVER FROM
YOUR OLD THERMOSTAT
1. Most covers snap off easily but some are attached by screws.
2. Note if either of the following apply to your old thermostat:
a. If you do not have a wire connected to C, two alkaline AA batter-
ies are required.
b. If you have wires connected to Rh and Rc and C, you’ll use two
breakers or switches to disconnect power in Step 2.
3. If you find that you have additional wires labeled anything other than
those shown in the diagram below – STOP and review to see if this
model thermostat is compatible with your system
O/B - reversing valve
Y1 - Cooling
Low Stage
Rc - 24 VAC, from cooling equipment
Rh - 24 VAC, from heating equipment
W - Heating
C - Common 24 VAC
G - Fan
Y/Y2 - Cooling High or Single Stage
A09271
4. Reattach the cover of your old thermostat. You’ll use it in Step 2 to
confirm the power is disconnected.
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