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Nest Thermostat wiring
Old 07-02-2018, 12:55 PM
Wiotte Wiotte is offline
Join Date: May 2017
Location: TV
Posts: 5,044
Default Nest Thermostat wiring

Originally Posted by LyndaS View Post
I installed a nest thermostat about a year and a half ago. I poured over all the videos and read and re-read the instructions. I originally had a Robert Shaw thermostat. Here is a pic of the wiring of the original thermostat and then the Nest that I replaced it with.

It can get tricky here with the O/B terminal. This will energize or de energize your reversing valve if you have a heat pump. You need to know what the sequence is and hope the thermostat logic can be switched to accommodate your system.
I also see no provision for emergency heat on the Nest.

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