Google Nest Thermostat Snow work with AA battery or must have 24 VAC power

[briancam2470]

Google Nest Thermostat Snow work with AA battery or must have 24 VAC power

[Patrick_Caezza]

It depends on the wiring and how the system is set up.

If you use the compatibility checker it will tell you if you need a C wire or not.

Personally, Just use the Nest Power Connector if you don't have a C wire and don't have a spare wire to make one.

[briancam2470]

My in-floor house GAS Heater is TWO millivolt wires to Two AA batteries powered programmable thermostat.  Will the Nest work without 24 VAC C wire?   Or is 24 VAC C wire also the POWER to the NEST?  I see Two AA batteries of to the side, are these for backup power only?

[sporfrog]

The batteries are primarily for backup power purposes. 

Regarding the millivolt system, review the incompatibility information here:

https://support.google.com/googlenest/answer/9246656?hl=en

[Patrick_Caezza · Accepted solution]

You can not run a Nest thermostat directly off of a Millvote system, but you can if you use an external 24VAC transformer and a simple relay.

This is one way to do it.

 

[briancam2470]

Yes this is what I needed to KNOW -- Thanks  Brian

[MelbaDT]

Hey folks, 

Thanks for responses, sporfrog and Patrick_Caezza. 

briancam2470, I'm glad that you've found the answers you're looking for. Let us know if you have more questions in mind. 

Best, 

Melba

[MelbaDT]

Hi, 

I haven't heard from you in a while so I'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community.

Best, 

Melba