Emerson 1f85u-22pr to nest third generation

[ali43]

Hello, 

i have a heat pump with cooling too, and i have an electric heat furnace that should go on when the heatpump is not sufficient anymore (around -20 to -30 c).

how to setup my wiring.

On the emerson, i have wires on the:
RC, O/B, Y, G, W/E, C and W2*.

[ali43]

the heatpump and furnace seems to be managed by an interface module.

how do i setup the wires on the nest?

[tajennifer]

Hi ali43,

Thanks for posting. I understand you need assistance with the wiring setup for your Nest Learning Thermostat 3rd Gen, specifically for use with your electric heat furnace. I appreciate the detailed information you provided; that's really helpful. Don't worry, I'm here to help!

• Could you please provide a picture of the previous wiring configuration?

Please keep me posted.

Best regards,

Jenny

[ali43]

i forgot to mention that i have the carrier module: Carrier KSAIC0301230. my heat pump and the furnace are carrier too.

how do u upload picture?

when i drag and drop it says i do not have permission.

thanks.

[ali43]

 Here is the emerson thermostat:

here is the controler wiring:

 

[tajennifer]

Hi ali43,

Thanks for your reply and the pictures provided. Based on your wiring system description and pictures, it seems to be compatible. 

You can check this wiring diagram below for the base placement and also you can check our "How to install the Google Nest Learning Thermostat" video for visual help.

Please let me know if you have more questions.

Regards,

Jenny