Question about Heating & Cooling
On a heat pump A/C unit the orange wire going to the thermostat operates the reversing valve. default is the heat cycle. Without the orange wire connected the unit will only run heat. Most straight cool units have no orange wire. Red wire to the thermostat is for 24 volt DC. Red wire to the blower motor is low speed Black is high speed. Hook up both and MELT THE MOTOR !
Posted on Nov 10, 2014
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Posted on Jan 02, 2017
this board needs a 24 volt supply run from the furnace to power up the communicating board
check your wiring diagram on the inside of the panel this will help you
Posted on Apr 05, 2011
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