0

I have 2 wires coming up from my basement oil fired furnace and 3 wires coming from my central air handler in attic I am trying to hook up a Honeywell WiFi thermostat. The 2 wires from the basement I believe are easy to hook up. One goes to white and one to Rh. The three from central air are green yellow and red. Which I believe will go to green, yellow and Rc. The question is I have no blue wire, C wire. If I look at the terminal in the attic is shows a blue wire on one side but does not label it C. ( see attached pic). Can I run a wire from #5 to C on thermostat enter image description here

enter image description here

1

You are correct

Based on the wiring diagram and provided photo, you appear to be correct that terminal 5 on your air handler's control block is your C terminal. So, go ahead and run your new thermostat cable, using that as C while matching the existing wiring for the remaining connections.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.