topic Re: Wiring Compatibility in Nest Thermostats

Wiring Compatibility

Vwilson23 — Sat, 08 Apr 2023 14:22:39 GMT

Good morning, as instructed I am just looking to see if my existing wiring is compatible with the Google Nest thermostat Model GA02082-US.

Any help is appreciated, thank you.

Re: Wiring Compatibility

sporfrog — Sat, 08 Apr 2023 23:12:35 GMT

It's unusual to see a two wire thermostat with terminals labeled R and C. Do you know any details about your HVAC system? Is it a very basic heat only system or something more complicated? Do you know the model of the existing/old thermostat?

Re: Wiring Compatibility

Vwilson23 — Sun, 09 Apr 2023 00:42:35 GMT

I see Lennox Model CX34–25A-6F- 1.

Serial # 6016E46127

thermostat - Honeywell

model # THX9421R5021WW

Should be basic heat system was updated 2017

Re: Wiring Compatibility

sporfrog — Sun, 09 Apr 2023 17:06:26 GMT

I am not sure, but it appears the thermostat is using a proprietary wiring system - at least at that location. The thermostat supports RedLINK, which further implies some level or proprietary system. Sometimes a thermostat is more of a satellite controller, often if a home has multiple thermostats, for a larger central system thermostat controller located elsewhere. My guess is that you could not install a Nest thermostat using that cable and those wires in the picture.

Re: Wiring Compatibility

zoeuvre — Wed, 12 Apr 2023 17:25:14 GMT

Hi Vwilson23,

I wanted to check if you managed to see sporfrog's post. Please let me know if you have any questions from here. I would be happy to assist, and make sure you are good to go.

Thanks,

Zoe

Re: Wiring Compatibility

zoeuvre — Sat, 15 Apr 2023 18:00:42 GMT

Hi there,

We haven’t heard from you so I'll go ahead and lock this thread in 24 hours. If you run into any more issues in the future, please feel free to create a new thread.

Regards,

Zoe