Will this work with my older trane unit?

[Fixitdude]

 x2 and t wires?  Not listed in compatibility lists 

[LJT1]

Looks like it should.  It depends on which Nest thermostat you have as well sa which one you're replaing.  Go onto Google's Nest compatibility checker. Here's the site: https://store.google.com/us/product/nest_learning_thermostat_3rd_gen?hl=en-US

[Patrick_Caezza]

@Fixitdude 

Your current thermostat is only fully compatible with the Nest Learning Thermostat, 3rd Gen, and would get wired like this.

Red - R to Rc

Brown - T - not used, tape off

Orange - O to OB

Green - G to G

Yellow - Y to Y1

Black - X2 to * (set as emergency heat)

Blue - B to C

White - W to W2 (set as Aux heat)

[Jenelyn_O]

Hi folks,

Thanks for posting in the Google Nest Community forum. I hope you get the answer you're looking for. Please let us know if you still have any questions or concerns, as I'll be willing to assist you further.

I appreciate your help, @Patrick_Caezza and @LJT1.

Best,

Jenelyn

[Dan_A]

Hey there,

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

Regards,

Dan

[Dan_A]

Hello again,

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.
 

Cheers,

Dan