Bryant Plus 90i Dual Fuel system

[hauser775]

I am trying to connect the Nest Thermostat.  Current thermostat is a Honeywell.  See picture.  Wondering if the B wire is actually the C common wire. 

[Markjosephp]

Hello hauser775,

Thanks for reaching out about your systems' compatibility with the Nest Thermostats. I'd be happy to take a look at this for you.

It appears that your heat pump system wiring setup is compatible. The blue wire would be your 24 V common. So, you should connect it to the C terminal for the Nest Thermostat. Also, please follow these guides for your wiring configuration so you have a reference:

• W/W1 (white)
• Y/Y1 (yellow)
• R/Rc (red)
• G (green)
• O/B (orange)
• C (blue)

Let me know if you need more help.

Best regards,

Mark

[Markjosephp]

Hey there,

I wanted to see if you still needed help. Please let us know if you have any other questions or concerns.

Thanks,

Mark

[Markjosephp]

Hi hauser775,

I'm checking in to make sure that you've seen my response. Please let us know if you have any additional questions or concerns before we lock this thread in 24 hours. 

Thanks,

Mark