6
Step 4. Take a photo
Take a picture of the wires connected to the terminal of your old
thermostat. You may need to reference this photo later.
RC
RH G
C
Y1 Y2
W1
W2 O/B
Step 3. Compatibility Check
If you find a thick wire with wire nuts on the backplate of the old
thermostat, or if the voltage of your old system is 120v or higher, it will not
be compatible with PCT513. If none of the above, then please proceed to
the next step.
OR
120V
or
higher
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