We added an AC to a preexisting sx 80 furnace and we are having a hard time wiring the new thermostat to the furnace, and the condensor to the furnace. Anyone know how to get a wiring diagram?? thanks
furnace will have 5 low voltage terminals,,R,,Y,,G,,W,,C...you have to connect R,,Y,,G,,and W at the furnace to R,Y,G,and W at the thermostat...so you have to use at least 4-conducter tstat wire between the tstat and furnace...typically you would use the red wire to connect the R terminals at tstat and furnace,,green wire for G terminals,,yellow wire for Y terminals and white wire for W terminals.. if your tstat wire doesnt have those exact colors it doesnt matter,,just be sure that the wires connected to R,Y,G,and W at the tstat are connected to R,Y,G,and W at the furnace respectively...if your tstat is programmable and requires a common wire to operate,,then you will need a 5 conducter tstat wire between tstat and furnace...the fifth wire, whatever its color,will need to connect the C terminal at the furnace to the common wire terminal at the tstat,,usually the common terminal at tstat is labeled C but not always.....as far as the outdoor unit goes..you will need at least a 2 conducter tstat wire to connect the Y and C terminals at the furnace to Y and C wires or terminals in the outside unit,,usually 24 volt polarity doesnt matter at the outdoor unit,,in other words as long as the 2 wires outside that are connected to the Y and C terminals in the furnace are connected to the [low voltage] 2 wires / terminals it will work,,unless one of the wires / terminals outside is clearly labeled as common.in that case make sure whatever tstat wire is connected to that wire / terminal is connected to C back at the furnace.....so at the furnace there will be one wire [red] connected to R....2 wires connected to Y. [ one going to Y at tstat,the other going to outdoor unit]...one wire [green] connected to G. and one wire [white] connected to W.....and one wire [common,usually blue] connected to C unless tstat requires a common wire,,in that case there will be 2 wires connected to C at the furnace.......hope i made it clear enough.......dan
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