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Old 02-10-2013, 01:52 PM   #1
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Heat pump not working or is it?

I was exercising the generator the other day and to put a load on it I turn both heat pumps on. The rear one worked fine ( heat pump/air conditioner only no furnace interface ) but the front one wanted to switch to furnace. I thought there was a problem with it since the rear one worked. Now I am wondering if the outside temperature may have been to low for the front heat pump to turn on. Outside temperature was around 40 degrees. Initially the front HP attempted to cycle on but immediatly switched to furnace. What do you think? Am I ok?

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Old 02-10-2013, 02:01 PM   #2
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i am thinking you figured it out Moe, way to cold for a heat pump to operate.
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Old 02-10-2013, 03:46 PM   #3
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Old 02-10-2013, 03:54 PM   #4
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When I exercise the gen set I set one heat pump for heat and the other for cold, after about an hour I switch them around. Our heat pumps will work down to about 34 before they switch over to the furnace.
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Old 02-15-2013, 12:22 AM   #5
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The propane furnace will start if the difference between the set point and temp is too great when running the heat pump.
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Old 02-16-2013, 02:47 AM   #6
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agreed at around 40F my heat blows cold and the furnace kicks in, also if I try to raise the ambient temp by more than 4 degrees--that was on an 07 Sunova with 1 a/c. Haven't tried the new one yet
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Old 02-16-2013, 05:58 AM   #7
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I think you are ok as well...My gas heat normally kicks in when it is in the 40's outside...another way to put a load on the genet is by running the hot start...I have a cover on my the hot exhaust coming out would create a call for the local FD :-)
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Old 02-17-2013, 07:40 AM   #8
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40 is not to cold, mine ran at 28 last two nites.

Are you sure both roof airs are heat pumps? Our friends 2010 Adventurer came with one of each.
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