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Installation of Google Nest thermostat

Billbolt
Community Member

Trying to install 4 Google Nest Thermostats in 4 zones using the nest power connector. I can see the W and R, but where is C located? Is it the ZC connector with a bridge onto ZR? Should I disconnect the bridge and just use ZC?

 

1 REPLY 1

jack5253
Community Member

Yes, as an expert in multi-zone HVAC systems and Nest installations, I can confirm: on many multi-zone HVAC control boards—especially those from Honeywell or similar zone controllers—the ZC (Zone Common) terminal often functions as the C (Common) wire connection for thermostat power. The ZR-ZC bridge typically exists to carry a 24V path between zones or control relays, not for powering thermostats.