Hello, is my Nest Thermostat E compatible with my existing wiring?

rgaila — Tue, 31 Aug 2021 14:55:48 GMT

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Original Poster: Dpj

Determine compatibility, and how to wire

Re: Hello, is my Nest Thermostat E compatible with my existing wiring?

rgaila — Tue, 31 Aug 2021 14:56:10 GMT

Hi Dpj,

Thanks for reaching out to us and welcome to our community! I'd be happy to decode your wiring setup.

Just for clarification, here's what your photo shows:

O: This is usually an auxillary heating wire, or a changeover valve that switches between hot and cool.
R: The R wire is the power wire for your heating and cooling system. If you only have one R wire (no Rh or Rc), you can connect your R wire to either Rc or Rh on the Nest thermostat.
B: Sometimes this is paired with the O wire, but it can also be a common wire (c-wire), which helps your Nest Thermostat charge. I would consult with a Nest Pro to ensure which wire it is.
X2/W: This looks like your heating wire, but to the best of my knowledge, the X2 port is uncommon in use with the thermostats.
Y: This controls your cooling system.
G: This controls your fan.

It looks like it would support a Nest Thermostat, but needs a professional lookover to make sure its installation doesn't damage your HVAC system.

Hope this helps! Let me know if you have any further questions for us.

Best,

-From Ai, Community Specialist.

topic Re: Hello, is my Nest Thermostat E compatible with my existing wiring? in Nest Thermostats

Hello, is my Nest Thermostat E compatible with my existing wiring?

Re: Hello, is my Nest Thermostat E compatible with my existing wiring?