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Posted by Bubba on November 15, 2007, 5:29 pm
wrote:
>
>I have a York combination system with an oil fired furnace and a heat
>pump. Everything is working fine but I have a question about how the
>heat pump and furnace work together.
>
>The thermostat is a 2 stage, when the first stage calls for heat, the
>heat pump alone comes one. If the room temperature drops another
>degree or so, the second stage calls for heat also and the furnace
>then comes on. Here is where my question comes in. When the second
>stage calls for heat and the furnace comes on, the heat pump
>compressor still remains on. As the furnace heats up, the heat pump
>condenser input air is getting hotter and hotter. The heat pump is
>trying to heat air that has already been heated by the furnace. At
>some point when the furnace warms up enough, the heat pump does
>eventually shut off , but it seems that it is shutting off due to a
>high pressure safety or something and that the line pressure is very
>high at that point. I imagine I can hear the compressor straining to
>pump heat into the already heated air and I'm thinking this can't be
>good for the compressor.
>
>Is it normal for a dual system to be designed so that the heat pump
>and furnace both are operating at the same time or should the controls
>be wired to turn the heat pump off immediately when the furnace comes
>on for second stage?
>
>thanks
>
>Mark
Did "HVACguy" wire this for you?
Bubba
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