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Ronald G Tisdale Posted on Feb 13, 2015
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I have a Domestic AC unit that runs when I have the heat on I need to see a wiring diagram at the thermostat to se if it was wired wrong.

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gbob59

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  • Dometic Master 3,063 Answers
  • Posted on Feb 13, 2015
gbob59
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Joined: Feb 17, 2008
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Could it be a heat pump? If the outside part is cold air not warm air that would be the case.

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When my unit comes on the ac blower and furnace fan come at the same time we replaced the unit and thermostat and probaly wired it wrong need wireing diagram

Yes you probably did. First question: Why did you replace thermostat? (This will give us a better clue as to what is actually wrong since thermostat is rarely the problem.) You'll have to give us more info. What brand and model thermostat, furnace and ac do you have. How many conductors (wires) are at thermostat location? And what color are they? Also make sure that the thermostat is set to either gas electric or heat pump. Model numbers will tell us. Another possibility is that there's a short in your wiring.
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Thermostat wiring diagram for Domestic RV rooftop AC

go on internet look up troubleshooting dometic rv a/c's
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WIRING THE THERMOSTAT TO AC UNIT THEN FROM THE UNIT TO HANDLER

Generally, you would go from the thermostat to the air handler, and then, from the air handler to the outdoor unit. I don't know if you have a heat pump or not, so I will give you a simple diagram and you can contact me if you need more.

Thermostat : Y G R W and sometimes C
Air handler: Y G R W and C
Outdoor unit: two wires connecting to the contactor ( not heat pump)

Thermostat; Y--------------Y(air handler cooling)------------------one side of contactor, outdoor unit
G-------------G (air handler, fan)
R--------------R (air handler ,hot)
W-------------W (air handler, heat)
C--------------C (air handler, common)------------other side of contactor, outdoor unit

This is a typical wiring diagram. Just contact me if you have something different. Hope this helps. Stay cool. mark
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AC unit not kicking on...

You need a "Y" terminal. "Y" is pretty standard on every heat pump. It is the wire that will energize the compressor contactor at the outdoor unit, allowing the compressor and condensor fan to run.
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My ac unit wont turn on or off after i changed the thermostat

Sounds like it isn't wired correctly. Check wiring diagram that came with thermostat. Also check to be sure thermostat is for both heating and cooling.
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Carrier 38CKC042300. oUTSIDE UNIT FAN WAS TURNING REAL SLOW. ac UNIT IS OFF BUT FAN TO OUTSIDE UNIT IS STILL TURNING. sHOULD NOT BE TURNING AT ALL WITH AC UNIT OFF

The outside fan may run if the unit is in defrost mode this is normal for most heat pumps it is there way of trying to keep the outside unit from staying iced over so the next time the unit runs it will have air flow through the coil and the ice will not be there to prevent air flow.
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Hi Proper way on wiring furnace.

I can give you a start, For heat only, R terminal on furnace to Red wire to R or RH terminal on thermostat. W terminal to White wire to W terminal on thermostat. G terminal to Green wire to G terminal on thermostat. This will get you heat but not air conditioning.
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