topic Re: Honeywell to Nest. How do I wire this properly? in Nest Thermostats

Honeywell to Nest. How do I wire this properly?

Daniel3 — Mon, 06 Dec 2021 17:57:00 GMT

I just need to know any solution that allows me to wire this in, if possible. I know I can consult a professional installer but I really don't want to spend another $100 if someone can assist me on here.

Re: Honeywell to Nest. How do I wire this properly?

sporfrog — Mon, 06 Dec 2021 18:50:46 GMT

I suspect you are in the same situation as this:

https://www.googlenestcommunity.com/t5/Nest-Thermostats/Connecting-Nest-Thermostat-SKU-GA01334-US-to-Honeywell/td-p/56709

Re: Honeywell to Nest. How do I wire this properly?

laurentbourg — Tue, 07 Dec 2021 16:24:39 GMT

You need to get a Nest learning thermostat, the current one you have (which is the mirrored face one) is not compatible.

Re: Honeywell to Nest. How do I wire this properly?

laurentbourg — Tue, 07 Dec 2021 16:28:12 GMT

And once you have purchased your Nest learning thermostat 3rd Generation, you will need to wire it per below:

Red R to R

Orange O to OB

Blue C to C

Yellow Y to Y1

Brown E to * - set as Emergency heat

Green G to G

White Aux to W2/AUX - set as AUX heat

Re: Honeywell to Nest. How do I wire this properly?

Daniel3 — Tue, 07 Dec 2021 16:54:20 GMT

Is it possible to make the current one work temporarily?

Re: Honeywell to Nest. How do I wire this properly?

laurentbourg — Tue, 07 Dec 2021 17:18:11 GMT

Yes it is, depending on the type of emergency heat you have. I don’t recommend going through the setup to have an incomplete system though. If you never use emergency heat, then you can afford to just disable it and potentially go ahead with your current Nest. Your hvac setup seems to be a heat pump as its primary source for heat and cold, which then gets help from an auxiliary heating system when it gets too cold, most likely a gas furnace. What is the emergency heat, are those electric coils part of the heat pump system?