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Thread: Substituting C wire with G wire

  1. #1
    Junior Member

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    Substituting C wire with G wire

    I have a 25 year old Carrier central AC with electrical baseboard heaters with no fans in the baseboards. Everything is electrical, there is no gas or propane, or heat pump. There is no other source of heat aside from the baseboards.




    The current thermostat is mechanical. The options on it are Fan : Automatic or On. Temperature: Heat, Cool or Off. So basically the one thermostat cools with the central AC and heats with the electrical baseboards.

    I'm trying to install the RTH8580WF Honeywell WiFi Thermostat but I have no common wire. Can I use my G wire instead of the C wire?

    I called Honeywell and they weren't even sure.

    Currently, the wires on the old thermostat are G, R, W, Y, 4.

  2. #2
    Junior Member

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    You need a 24V signal to fire the Therm....

    SInce you don't have central AC you could always add a 24 plug in transformer for your C wire.

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