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Compatibility
The power extender kit (PEK) requires that your HVAC system has one of the following sets of wires:
If your HVAC does not have these wires, your system may not be compatible with the PEK.
4 Wires: W/W1, Y/Y1, G, and R (including Rc or Rh)
or
3 Wires: Y/Y1, G, and R (including Rc or Rh)
INSTALLING THERMOSTAT WITHOUT A C WIRE (CONT.)
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