Question about Heating & Cooling
I just got this ac replaced and they left blue wire at handler disconnected now I'm trying to install a Honeywell wifi thermostat and need to hook that wire correctly,, thank you
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Posted on Jan 02, 2017
Typically if you have a yellow wire in the "y" terminal blue is used as common or "c". As far as your jumper from rc to rh, that will depend upon what type of heat you have. If all of your heat and cooling come from your packaged unit outside, yes you will need the jumper. If this does not work maybe you have a bad breaker or transfomer.
Posted on Oct 14, 2007
If you have a heat pump do not put your blue wire on b. Put it on x or c. If you don't have an inline fuse you may have blown your transformer.
Posted on Dec 04, 2007
this link has a good diagram of the wiring. It should help you.
Posted on Nov 05, 2009
For Trane sytems, B is your "Common" wire. O is your reversing valve relay, G is your fan, Y is your compressor contactor, R is Hot, Brown will not be used on your electronic tstat. X2 is your backup electric heaters. Without knowing what terminals are on your new tstat, I cannot offer more information than this. The installation manual may indicate what each terminal is controlling. I strongly suggest to write down ALL of the terminals and colors from your old t-stat and be sure to turn off the power to your air handler. Put the fan switch on your tstat to ON before turning off the power. Make sure the fan is running. Then turn the power off to your Air Handler. If your fan stops running, you have turned the power off to your tstat and are ready to start replacing it with your new tstat. I hope you find this helpful. Good Luck!!!
Posted on Feb 07, 2010
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