Keeping Thermostat Backlit Display On With No C Wire - HVAC - Page 2 - DIY Chatroom Home Improvement Forum
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Old 06-10-2020, 09:27 AM   #16
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Re: Keeping thermostat backlit display on with no c wire


Quote:
Originally Posted by 57TinkerMan View Post
You mentioned that you had only 3 wires in use before you pulled a common wire, is this a cooling only application?


Attachment 602377
No, But this is a slave tstat to a master, where the fan is controlled by the master. System is using a 2 zone controller with master and slave tstats.
So this controls only a call for heat or a call for cool.
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