Wiring hvac 24 ac transformer color code8/25/2023 Once you’ve located the HVAC control board, verify there is a common terminal. If you’re unable to locate your HVAC control board or are uncomfortable doing so, please contact a certified HVAC technician in your area for additional assistance. In most cases the control board can be found at your furnace or air handler. The HVAC control board is where the thermostat wires connect to your heating and cooling system. Locating your HVAC control board and identifying the common terminal: All options require a common terminal at your HVAC control board. If the previous thermostat did not have a common wire and used batteries for power or you had a mercury thermostat, there are several options available to connect a common wire. IDevices Thermostat requires a 24V common or ‘C’ wire, which provides continuous power for features like Wi-Fi connectivity and the backlit display.
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