Dual Zone wiring

[AlexD1377]

New Nest installation replacing 2 thermostats in a dual zone system. Which wire do I need for the OB slot on the main?

 

 

 

[AlexD1377]

to clarify, I do have a second Nest thermostat to install in the other location to control the 2nd zone.

[Patrick_Caezza]

@AlexD1377 

Do you have a picture of the original thermostat wiring that you can post?

What is the manufacture and model # of the zone controller?

[AlexD1377]

@Patrick_Caezza

Carrier is the brand. Not sure i have the exact model number. Just whats on the wiring diagram.

The original only used 4 lines, so maybe I just wire it up the same? Just unclear if Nest needs it, or if the board takes care of it.

 

[Patrick_Caezza · Accepted solution]

@AlexD1377 

It looks like your system is not compatible with any Nest thermostat.

That is a proprietary interface which Nest doesn't support