![]() ![]() And yes, I already do not like Nest but it was free so I figured I would try it out. ![]() except maybe for the hookup to the 24 volt transformer. The Nest will never have heat hooked up to it, so the Rh and C wire ports are essentially never going to be used. To make the Nest powered up on a constant basis, and have the battery charged, and to not kill the condenser contactor, I think the 24 volt transformer is the way to go. Additional info: I have access to air handler in attic but I do not see a C terminal. Connecting the transformer into the C and Rh wire plugs will allow the Nest to be powered separately from the Rc air conditioner wire. My idea to fix the missing C wire issue: buy a 24 volt transformer, and install one wire into the C connector on Nest and the other wire into Rh. Nest seemed to work but in a few hours, the contactor was buzzing and nothing more. On the old (battery-backed up thermostat), then on the Nest thermostat, red wire went to Rc and yellow wire went to Y. My wiring: a red wire, and a yellow wire. ![]() I think it is Nest taking power from the red wire that is doing it. ![]()
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