topic Nest thermostat compatible in Nest Thermostats

Nest thermostat compatible

TheDweeb — Wed, 03 May 2023 14:24:55 GMT

Hello, I am wondering if my existing wiring is compatible with the Nest.

is the blue (B) wire common in my setup?

is the brown wire for O/B? It is currently not connected to anything.

The previous thermostat was a Trane T8411R

thanks in advance!

Re: Nest thermostat compatible

CoolingWizard — Wed, 03 May 2023 18:55:11 GMT

@TheDweeb , the absolute easiest way to verify if indeed, the blue wire attached to the B Terminal is your common, you need to use a multimeter and with the power on, check for AC voltage between B and R terminals. If your meter measures somewhere between 23 and 27 V of AC power, the B blue wire is indeed common.

The AC Cooling Wizard

Re: Nest thermostat compatible

Patrick_Caezza — Sun, 07 May 2023 05:35:45 GMT

@TheDweeb

Many old Trane thermostats label the C wire as B in the Thermostat, and X2 is the emergency heat convection.

Your current thermostat is not fully compatible with the Google Nest Thermostat. Only the Nest Learning Thermostat, 3rd Gen, is fully compatible.

Re: Nest thermostat compatible

Jenelyn_O — Wed, 10 May 2023 16:35:29 GMT

Hi folks,

Thanks for reaching out. I hope you get the answer you're looking for. Please let us know if you still need help, as we'll be willing to assist you further.

I appreciate your help, @CoolingWizard and @Patrick_Caezza.

Best,
Jenelyn

Re: Nest thermostat compatible

TheDweeb — Wed, 10 May 2023 16:46:34 GMT

@CoolingWizard I will test this once I am able to get back into the home (being painted atm)

@Patrick_Caezza I will return mine for that one then, thanks!

Re: Nest thermostat compatible

Jenelyn_O — Wed, 10 May 2023 16:58:14 GMT

Hey TheDweeb,

That sounds like a plan! I'll just keep this thread open to ensure everything will be taken care of. Please keep us posted.

Thanks,

Jenelyn

Re: Nest thermostat compatible

Markjosephp — Sat, 13 May 2023 18:37:29 GMT

Hi TheDweeb,

I'm checking back in — how's it going? Still need our help?

Regards,

Mark

Re: Nest thermostat compatible

Jenelyn_O — Sun, 14 May 2023 21:34:50 GMT

Hi folks,

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 for your help, mark.

Best,

Jenelyn