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I am trying to send picture existing thermostat wiring to see if compatible with Nest

patmcgowan
Community Member

Have picture to send to see if my heating system compatible with Nest thermostat

patmcgowan_0-1665235391254.jpeg

 

 

1 Recommended Answer

Patrick_Caezza
Platinum Product Expert
Platinum Product Expert

Yes, your current thermostat is compatible with any of the Nest thermostats, but a C wire is required to make it work.

The easiest way to add a C wire is to use a spare wire in the thermostat cable. If there is not spare wire, then you'll need to use the Google Nest Power Connector and possibly an external 24VAC transformer if there is not C terminal at the heating sysytem.

I'n going to go with no wire and no C terminal.

Try this wiring.

2022-04-06_182952.jpg2022-03-01_173137.jpg

View Recommended Answer in original post

5 REPLIES 5

MrVacca
Silver Product Expert
Silver Product Expert

I don’t believe so @patmcgowan - only those 2 wires is not enough. You’ll def need a C power connector and possibly another line. 

Patrick_Caezza
Platinum Product Expert
Platinum Product Expert

Yes, your current thermostat is compatible with any of the Nest thermostats, but a C wire is required to make it work.

The easiest way to add a C wire is to use a spare wire in the thermostat cable. If there is not spare wire, then you'll need to use the Google Nest Power Connector and possibly an external 24VAC transformer if there is not C terminal at the heating sysytem.

I'n going to go with no wire and no C terminal.

Try this wiring.

2022-04-06_182952.jpg2022-03-01_173137.jpg

Hey patmcgowan,

 

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, MrVacca and Patrick_Caezza.

 

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

aatienza
Community Specialist
Community Specialist

Hi everyone,

 

Just checking in to make sure that you've seen our responses. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.
 

Thanks,

Archie