Nest Thermostat E - Two systems/units

[mmalj]

Hi! 

I am trying to get some compatibility information relating to a current Nest Thermostat E I have. 

Setup: 

AC unit (single zone) in attic, Baseboard water fed boiler (3 zone, 3 totally separate thermostats) in basement. 

I have a second floor thermostat I would like to replace with Nest E. This thermostat controls the on/off for AC and the 2nd floor zone for heat.

Wiring: 

RH, W (these come from one system)  & RC, Y, G (there is another white color wire, not connected to anything) - There is no jumper between the RH and RC or anywhere. 

How can I wire up the Nest Thermostat E?

The blue wire connects to the Y screw

[Patrick_Caezza]

The thermostat that controls the AC and 2nd-floor zone needs to be a Nest Learning Thermostat, 3rd Gen. This is because you have two separate systems and each has its own transformer.

The heat side would connect to the W and Rh terminals and the cooling side to the Rc, G, and Y terminals.

[aatienza]

Hey mmalj,

I'd like to jump in here and check if you've seen Patrick_Caezza's response. Let us know if you need more help by replying to this thread.

Thanks,

Archie

[MelbaDT]

Hey there, 

Checking back in should you still have some questions about this. 

Best, 

Melba

[MelbaDT]

Hi, 

We haven't heard from you in a while so we'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