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Thermostat compatibility

Danjohn
Community Member

4B1D0CDA-C0C5-4795-8198-CD393ACC4178.jpeg

This is my current wiring for thermostat. Was wondering how to wire to my new nest thermostat? Any help would be greatly appreciated 

8 REPLIES 8

CoolingWizard
Platinum Product Expert
Platinum Product Expert

Just follow the Nest installation instructions included with the thermostat and it will guide you through the steps.  

Ken, The AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner. If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo.

aatienza
Community Specialist
Community Specialist

Hey Danjohn,

 

Checking in — we hope you've got the answer you're looking for. Let us know if you have more questions in mind.
 

I appreciate the help, CoolingWizard.

 

Thanks,

Archie

aatienza
Community Specialist
Community Specialist

Hey there,

 

I just wanted to follow up to see if you still need our help. Please let us know as we would be happy to answer any questions you may have. 
 

Thanks,

Archie

Danjohn
Community Member

My nest thermostat is hooked up and works for a short time then loses power

Jake
Community Specialist
Community Specialist

Hey there,

 

Thanks for the help CoolingWizard.

 

I wanted to check in and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.

Best regards,
Jake

Jake
Community Specialist
Community Specialist

Hey there,

 

I wanted to check in, and let you know that I will be locking the thread in 24 hours.

 

Best regards,

Jake

CoolingWizard
Platinum Product Expert
Platinum Product Expert

DanJohn,

If your thermostat is losing power, then in all likelihood, the B wire on your old thermostat is not attached to the common side of the transformer in your air handler. Your old thermostat did not have a terminal connection on the C. Therefore some of those use the B terminal as the common landing point. It does not necessarily mean that the other end was connected to common though. One way you can check this is to get a volt, ohm multimeter and check the power of the AC incoming between R and C of your nest back plate. You should see about 24 Volts of AC power. 

The AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner. If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo.

aatienza
Community Specialist
Community Specialist

Hey Danjohn,

 

I'd like to jump in here and check if you've seen Patrick_Caezza's response. Let us know if you need more help by replying to this thread.
 

Thanks,

Archie