I'm replacing a home thermostat and need help verifying that I rewired the unit correctly?

Question

My old thermostat was ancient and I replaced it with a more modern version.

I want to verify that I correctly placed the wire correctly on the new unit, as none of the letter codes or wire colors were consistent between models or in the manual.

I tested it out and everything works fine- both heat and ac. I just want to make sure there isn't a fire risk or something just incase I am wrong.

Please note that the old red wire was attached to Rh. The old blue wire was attached to either "C" or "G".

THANK YOU!

Farid · Accepted Answer

Hello,

Yes, I believe you have wired the new one correctly. Here are what the wires represent:

C = common wire: This is used to power the thermostat (optional, not needed. Saves you from replacing batteries)
W/W1 = 1st stage heating (must be present)
Y = Cooling wire (connects to cooling system)
G = Fan
R/RH = System power

C or G should not be mixed up, as they are both 2 different wires

Just make sure wires are tightened, not loose (not too tight though) and you should be all set

Frank · Answer

No fire risk. It's only 24V. You would short out the internal fuse if you wired it wrong. Then nothing would work.

Hockeytown562 · Answer

This is the new unit. Thank you!!

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I'm replacing a home thermostat and need help verifying that I rewired the unit correctly?

3 Answers