Heat pump dilemma

Old 07-12-01, 07:54 PM
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I have a heat pump unit which I have installed a new digital thermostat last winter. Everything ran fine when the heat was on. When the weather warmed up and cooling was needed we changed the thermostat over to cool but did not get cool air out of the ducts. Instead it was room temp or warmer. Called the service man out and found that the wiring from the original thermostat to the unit is not correct. Question: How can I correct this wiring problem? I have the colored wires at the thermostat and what colors go to each terminal. My problem is how do I identify the same at the unit? PS The problem was somehow the emergency heat was running the same time cooling did causing no cool air. We have disconnected the emergency heat. Thanks for your help.

Bill Withus
Old 07-13-01, 02:03 PM
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Call a "TECH"

have him(or her) wire it correctly.You have already spent big bucks for running a/c and heat together.Also have a complete system while they are there.PDF
Old 07-14-01, 09:31 AM
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Bill, from your description, a good guess is your reversing valve coil is not being energized. Some units need the valve energized for heat and some for cool. I have a Trane, and it is energized for cooling. If the heat pump was heating properly then your reversing valve coil should be energized for cool. Or the reversing valve is energized all the time or is stuck. Most likely you need to have the rev. valve coil energized for cool, in which case you should have an orange wire connected to O on the thermostat and the orange wire spliced to orange at the compressor.
Old 07-15-01, 05:21 AM
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Forgot to ask.Does a/c work good since you have shut of electric/emergency heat?PDF

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