ac connection to thermostat control


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Old 07-14-13, 12:47 PM
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ac connection to thermostat control

i have old wiring in my home,(red blue white).i am trying to connect whichever one of those three wires to the thermostat control (b,o,g,y,w/aux,r,rc).please help me which one goes to which???
 
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Old 07-14-13, 01:43 PM
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Does that control heating or just air conditioning. Red will be your 24v hot, then you have to find out which one does the fan and which one does the cooling. Do you still have the old thermostat?
 
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Old 07-14-13, 06:58 PM
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There is no UNIVERSAL color code for low voltage wiring therefore you need to open the unit that you are controlling to find out how it is wired. Guessing could lead to a short and a blown fuse or transformer.

How was the old thermostat wired?
 
 

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