White Rogers 1F78 Thermostat -> Nest

[magmasystems]

Hello all,

I am trying to determine if the Nest thermostat is compatible with my HVAC setup. I have attached 4 photos
1. From the White Rogers 1F78 user manual showing the setup
2. A rendering of the wiring that I made ... hopefully for clarity.
3 and 4. Actual photos of the wiring 

We would like to replace this old thermostat with a Nest but I would like to be assured that the Nest is compatible with the wiring. We have no "common" and ideally, I don't want to hire an electrician to run a common wire from the HVAC because of the expense. 

Thanks.

[Patrick_Caezza · Accepted solution]

@magmasystems 

Your current thermostat is compatible with any of the Nest thermostats.

Try this wiring,

White - Y to Y1 or Y (jumper to W not needed)

Red - RH to Rc or R (jumper to RC not needed)

Green - G to G

Blue - O to OB or */OB

The "or" is for the Google Nest Thermostat wiring

[magmasystems]

Thanks for the answer, @Patrick_Caezza . Much appreciated.

[Markjosephp]

Hello folks,

Thanks for the help, @Patrick_Caezza.

@magmasystems, I hope you've got the answer you're looking for. If you're still in need of assistance, feel free to let us know, as I would be glad to know what the result of the installation would be.

Regards,

Mark

[Jenelyn_O]

Hi there,

I wanted to follow up if you still need help. Please let me know if you’re still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

I appreciate your help, Mark.

Best,

Jenelyn

[Jenelyn_O]

Hi magmasystems,

We haven't heard from you in a while so we'll be locking this thread if there is no update within 24 hours. If you need assistance or want to discuss topics, feel free to start a new thread.

Thanks,

Jenelyn