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Nest Thermostat Wiring question

kstephen01
Community Member

Hello, I am trying to replace an older Nest learning thermostat (wifi died) with a new Nest Model #G4CVZ. 

But the new model does not have the same number of wire blocks? What wire goes where? 

 

New Nest

New NestNew Nest

Old Nest

Old NestOld Nest

 

 

7 REPLIES 7

Houptee
Silver Product Expert
Silver Product Expert

You have 2 stages of Heat and 2 stages of cooling so you need the Nest Learning Thermostat.

Or if you dont care about the 2 stages you could put the 2 W in the same W terminal and the 2 Y in the Y terminal.

If you do this way you do not have the switching from low stage to high stage anymore it will run full power cooling and full power heating.


Houptee -- NJ Master HVAC Licensed Contractor

Thank You for the response! in your expert opinion what are the benefits i would lose by not having the 2 stages?  

Houptee
Silver Product Expert
Silver Product Expert

It is less efficient and runs full power heating and cooling when it kicks on.

The stages are designed to run at lower power in mild conditions when you don't need 2nd stage and if it senses the house is too hot or cold it brings on the 2nd stage.

Its supposed to be more comfortable with 2 stages.

Only the Nest Learning model has the extra terminals to do 2 stages of both heat and cooling.


Houptee -- NJ Master HVAC Licensed Contractor

EdwardT
Community Specialist
Community Specialist

Hi folks,

 

@Houptee, thanks for the help!

 

@kstephen01, how's it going with your Nest Thermostat? Still need our help?

 

Thanks,

Edward

EdwardT
Community Specialist
Community Specialist

Hi kstephen01,

 

It's me again. I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do. 

 

Thanks,

Edward

No Addtional Questions Thank You, just no thrilled about returning my New Nest and buying another Nest Learning thermostat. the last Nest Learning thermostat I had wifi failed on it after only 2 years with Zero support from Nest. 

EdwardT
Community Specialist
Community Specialist

Hi kstephen01,

 

Thanks for the update. I'm sorry to hear about your experience. Don't hesitate to reach out to us whenever you need assistance. I will be locking this thread in 24 hours. Please feel free to create a new thread should you have some more questions or concerns in the near future and we'll be more than glad to help.

 

Thanks,

Edward