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Old 01-04-2012, 08:15 AM   #1
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2001 34' Limited S/O
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Post Heat Pump

I live in north Florida and the temp was 18 last night, I cut the heat pumps on zone one and two on 61 to keep it warm. I checked it this morning and the heat pumps were not running and would not come on, but the furnace was running even though it was not set on the furnace. Any ideas what is going on? I would like the heat pumps to work in the freezing nights and not use up the propane. Any help would be appreciated. Thanks, Glen

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Old 01-04-2012, 08:26 AM   #2
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Heat pumps will cut off and the furnace will come on when it gets really cold. 20 here in Gainesville last night. jim
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Old 01-04-2012, 08:39 AM   #3
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The CCC automatically switches from Heat Pump to Furnace when the sensor on the roof senses 30°. This is to provide heat to the tanks and plumbing to prevent plumbing freezing up. It will switch back to Heat Pump operation around 38°. Heat pumps also decrease in efficiency as the temperature drops so there is a practical limit on how much warmth you can extract from outside air when it really gets cold outside. You could use an electric space heater, and some roof units accept optional heat strips, but remember, these don't circulate warm air under the floor.
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Old 01-04-2012, 08:39 AM   #4
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Your system worked perfectly as designed. The heat pump loses efficiency in the mid to upper 30's, and the furnace takes over.
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Old 01-04-2012, 08:43 AM   #5
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Keep in mind a little coverd factoid in the manual. If you disconnect the battery, you must reprogram the CCC or else the automatic switchover to furnace will not happen. It's is now on my "every spring out of storage to-do-list".
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Old 01-04-2012, 08:54 AM   #6
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Originally Posted by dznf0g
Keep in mind a little coverd factoid in the manual. If you disconnect the battery, you must reprogram the CCC or else the automatic switchover to furnace will not happen. It's is now on my "every spring out of storage to-do-list".
Some have noticed a loss of these special functions if the 12V was disconnected from the coach (batteries and converter) typically during storage. The button arrangement on the 5-button CCC and the newer model are different but the process is the same to perform a reset.

What isn't in mentioned in the book is when you release the buttons, the CCC screen will go blank. Simply select a mode and all will display once again.
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Old 01-04-2012, 09:08 AM   #7
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Heat pumps can be designed with a higher "lift" (input to output temps) but the simple ones in RV units are not made that way. They have a cutout when it gets below their design temp, somewhere in the 35 degree range as I recall.

Home units generally work into the 20's, and special two stage units can work at even lower temps.
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Old 01-04-2012, 09:11 AM   #8
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Some have noticed a loss of these special functions if the 12V was disconnected from the coach (batteries and converter) typically during storage. The button arrangement on the 5-button CCC and the newer model are different but the process is the same to perform a reset.

What isn't in mentioned in the book is when you release the buttons, the CCC screen will go blank. Simply select a mode and all will display once again.

Yup, do we really know when that change occurred? My 07 loses all it's memory if battery is disconnected.
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Old 01-04-2012, 09:13 AM   #9
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heat pump

Thanks everyone for the information

Glen
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Old 01-04-2012, 09:28 AM   #10
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Originally Posted by dznf0g

Yup, do we really know when that change occurred? My 07 loses all it's memory if battery is disconnected.
I was thinking I hadn't observed that, and assumed I had a newer CCC. I keep mine plugged in next to the house and will try to remember to disconnect the batteries and pull the plug when it gets colder to test the CCC functionality after a power loss.
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