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Yes, that C connector on the valves is what you want. The nest thermostats use very little power, so that shouldn't be an issue for your transformer. There are two wires coming from the transformer. On a typical HVAC system, the red wire is used for control, and the other wire is what gets used as the "common" or C-wire. In your diagram it looks like ...


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I am really not sure you have asked a question. Your heading mentions a diagram but you have no diagram just pictures. So when you send in better pictures per @ThreePhaseEel request you might see if you could post up some sort of diagram. If you real question is, Why isn't my cooling coming on? Then one of the reasons is that you haven't connected you're ...


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