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TIP: The wiring on your old thermostat may look dierent—
just check to see if there’s a C wire.
YES NO
RC RH
RC RHRC RH
RC RH
10
CHECKPOINT: C WIRE
Do you have a C wire connected to your old thermostat?
Great! Continue
to the NEXT PAGE.
Go to PAGE 24 to
install with a PEK.
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