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I would like to connect my new Honeywell WiFi thermostat (RTH6580WF1001) to a Lennox Elite dual Heater and Cooler system. I don’t have a C wire in my old thermostat. I have read online that I can connect the G wire into the C terminal, at the thermostat and heater cooler system. In the terminal block I already have a wire connected (see photo) in the C terminal, Is it OK if connect the G wire in the same in the C terminal given that there is already a red wire in the C terminal at the furnace? thank you

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mike65535
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Antonio Monserrat
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