Google Nest Thermostat compatibility

[wiltoncraig53]

Can a Google Nest Thermostat  with 6 wire connectors be compatible for my current 7 wire Honeywell  thermostat? Please Advise.    If compatible where does the 7th wire get connected? Thanks, Craig

current Honeywell Therm diagram

[sporfrog]

Do you know which type of HVAC system you have?  The thermostat wiring has two columns of terminal labels -one for Conventional (inner columns), and one for Heat Pump (outer columns). 

The "Nest Thermostat" will not work 100% with your system. However you can use a Nest Learning Thermostat 3rd Gen.  

To verify see the Compatibility Checker.  You will need to know which terminal labels apply though to be sure.

It's maybe possible you could give up on some feature and use a "6 wire connectors" thermostat depending on which labels apply to your system.

[wiltoncraig53]

Hello Sporfrog!

I have a Trane HVAC System Model NO. 2TEE3F31A1000AA 200-230 VOLTS  with a Heat Pump.

Thanks, Craig 

[sporfrog]

Hi @wiltoncraig53 ,

As @Patrick_Caezza indicated the 3rd Gen is compatible with your system.

In some cases, if folks want to purchase a less expensive thermostat, they can even though they have "seven wires".

For example if you have a conventional furnace with A/C that has 2 stage heating and cooling. If your climate is such that cooling or heating needs aren't extreme, it is possible to not connect one of the 2nd stage wires. The 2nd stage simply would never be called by the thermostat. Further, in some cases it is possible to program the logic board of the furnace (usually with a jumper or dip switch) to automatically switch to second stage after xx minutes - in which case the furnace controls 2nd stage not the thermostat. I generally would not recommend, but it works.  It is usually better to just get a thermostat that is 100% compatible. 

This isn't a good option in your case.

Good luck with your thermostat purchase and install!

[MelbaDT]

Hey folks, 

Thanks again for responding and for your recommendation, sporfrog. 

wiltoncraig53, how's everything now? Still have more questions in mind?

Best, 

Melba

[MelbaDT]

Hey wiltoncraig53, 

Checking back in — still need our help?

Best, 

Melba

[MelbaDT]

Hi, 

I haven't heard from you in a while so I'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community.
 

Best, 

Melba

[Patrick_Caezza]

Only the Nest 3rd Gen Learning Thermostat is compatible with your system.

It would be wired something like this.

Blue - C to C

Green - G to G

Yellow - Y to Y1

Orange - O/B to OB

Red - RC to Rc (jumper to R not needed)

Black - AUX to W2

White - E to * (set for emergency heat)

[MelbaDT]

Hey folks, 

Appreciate both of your responses here, sporfrog and Patrick_Caezza. 

wiltoncraig53, I'm chiming in here to check if everything is good to go. Feel free to let us know if you still have some questions in mind.

Best, 

Melba