what does each thermostat wire do?

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Old 03-24-09, 08:34 PM
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what does each thermostat wire do?

I work with industrial heat treating equipment. Out of curiosity I started looking at schematics of my furnace to see how similar they are to industrial heating equip. Everything is pretty clear except when it comes to thermostat wiring. I cannot find any reference that tells me what each wire does. My furnace is a Trane XE90. It has terminals labeled "Y W R G C" for the thermostat. Can anybody tell me how the thermostat wiring works and what each of the terminals do? Or can you point me to a good reference on the topic?
 
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Old 03-24-09, 08:37 PM
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r- red hot wire from furnace transformer (24v) w- white is your return to furnace g- green is your fan y- yellow is your air conditioning
 
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Old 03-24-09, 08:41 PM
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sorry c is your common not always used, usually used with t-stat to keep it on when battery dies
 
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Old 03-24-09, 08:49 PM
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Thanks! - well apparently my reply has to be at least 25 characters.
 
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Old 03-24-09, 08:50 PM
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Originally Posted by Quimrider View Post
Thanks! - well apparently my reply has to be at least 25 characters.
your welcome, I know what you mean thats why iam saying I know what you mean lol
 
 

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