Where to add C wire on this air handler?

Question

Thanks for helping me here. I am adding a new wifi thermostat to my system but need to add a C wire directly to the air handler (system is a First Co air handler with hot water boiler for heat and separate condenser for A/C). I’ve attached a wiring diagram. Can I simply splice into the brown wire directly off the transformer without effecting anything else?

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thermostat thermostat c wire

Tester101 · Answer

Yes, that should work. I'd prefer to make the splice at a terminal or an existing junction, but you can splice it in the middle of the wire just as well (as long as there's enough slack in the wire).

Where to add C wire on this air handler?

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