Trane TCONT900AC43UA - Nest Compatibility?

[SakeM0nk]

Hello, I have a Trane ComfortLink II and wonder if Nest is compatible.  The ComfortLink thermostat has only three wires, D, R, and B.

Thanks,

Daniel

[MelbaDT]

Hi SakeM0nk, 

Sorry for the delayed response but thanks for reaching out to the Google Nest Community. 

Since the wires in your thermostat’s connector that have non-standard labels, it could be that your system is proprietary. I'm afraid these aren’t compatible with Google Nest thermostats. However, some proprietary systems can be rewired by a pro installer to be compatible.

Hope this answers your question. 

Best, 

Melba