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Your C wire is indeed the one that's labeled C While your setup with the condensate pump is a bit more complicated than most, it doesn't change the fundamental way things work. Your thermostat still puts 24V on Y to call for cooling, which gets passed on by the condensate pump to the Y1 terminal on your control board. Your AC compressor is connected to ...


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I'd get a "piggyback" crimp connector and use that to land the common C wire on the C terminal Given that your board does not supply outgoing C terminals, we have only one sane place to tap C left, and that's at the terminal where it comes into the board from the transformer. However, we still need to be able to connect the incoming C wire to that ...


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It looks like all the yellows and blues from the thermostats were nutted together with an unconnected pigtail all ready and waiting to do this. So you just need to know where to connect that one loose wire. Near the top left of the board are two yellow wires, the 24V supply, marked C and R. The top one is C. Worst case you'll have to connect there, though ...


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