Should AC compressor come on when heater comes on?


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Old 01-12-11, 07:45 AM
J
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Should AC compressor come on when heater comes on?

I just moved into this house. There are 2 zones. Upstairs and downstairs. When heat is set for upstairs, only the upstairs blower comes on, not the outside compressor. When heat is set for downstairs, the outside compressor also comes on when air flows through vents. The air is warm but not hot like upstairs. Does this sound right? I have never seen where an outside compressor comes on when heat is selected.
 
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Old 01-13-11, 08:01 AM
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What type of heating systems do you have? If gas or oil, no the outdoor condensing unit should not come on.
 
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Old 01-13-11, 10:01 AM
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it should if it is a heat pump system.
 
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Old 01-16-11, 07:19 PM
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apparently you have two separate systems. the one that runs the outside unit is a heat pump. the compressor runs and the freon flow is rerouted. the inside coil and outdoor coil reverse roles so that heat energy is extracted from the air outside and transferred to the inside. you have backup electric heat strips to assist the heatpump when it is needed. electric heat is also used when the heat pump is non-functional. this is accomplished via the emergency heat switch on the thermostat. additionally, if ice builds up on the outdoor coil, the defrost cycle signals the thermostat to run the electric heat strip while ice is melting off.

if you are having performance problems, they could be attributable to a problem with the freon system. you may need to have a technician test it.
 
 

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