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01-11-2017, 11:09 AM
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#1
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Junior Member
Join Date: Jan 2017
Posts: 2
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Basement heat pump frosting over
Hello,
I have a 2004 Winnebago Adventurer with the True Air basement heat pump. I have an issue that needs an answer. When I use the heat pump to warm up the cabin, it begins to frost over completely on the outside. The outside air temp has been between 18-30 degrees outside. Is it normal for the heat pump to frost over in theses Temps?
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01-11-2017, 11:36 AM
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#2
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Yes, most heat pumps quit working at about 35° unless they are equipped with defrosting units. Also, most heat pump controls will switch over to a backup heat source like a propane furnace, but not all do that.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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01-11-2017, 11:40 AM
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#3
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Junior Member
Join Date: Jan 2017
Posts: 2
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Mr. D,
Thank you very much for the input. I will just use the propane furnace and small space heaters to keep the cabin warm.
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01-11-2017, 12:10 PM
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#4
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Senior Member
National RV Owners Club
Join Date: Mar 2012
Location: Lac Du Bonnet, Manitoba
Posts: 685
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It is normal for these to freeze over in cooler outside temperatures around freezing and can freeze over quicker if the outside humidity is high. Ours eventually stops and causes the gas furnace to take over.
__________________
Ellen & Greg
08 National Dolphin DL-35Ci, RoadMaster Rear Sway Bar, Rear Trac Bar, Koni Shocks Front,
Workhorse W22, Kelderman Air Ride, Towing 2016 Smart Car
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01-11-2017, 04:33 PM
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#5
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Community Administrator
Tiffin Owners Club
Join Date: Sep 2013
Location: DFW, Texas
Posts: 21,267
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It is perfectly normal for them to frost over at anything below 36 or so. We have a heat pump at our home and it will some times frost over solid. It is designed so that one time each hour it reverses itself into AC mode so the outside coils will warm up and melt the ice. Unfortunately, RV heat pumps don't have this function.
__________________
2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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01-11-2017, 04:40 PM
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#6
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by Lt Dan
Unfortunately, RV heat pumps don't have this function.
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Some do, the 13.5 ones in our '02 DSDP had the function. It was an option the Newmar specified for their units in some lines.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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01-11-2017, 05:52 PM
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#7
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Moderator Emeritus
Country Coach Owners Club Freightliner Owners Club
Join Date: Sep 2004
Location: Glen Allen, VA
Posts: 7,902
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We had the same heat pump in our previous coach, a 2002 Journey. It heated very well down to about 36F. Lower than that, it will ice up since it does not have a defrost cycle like a residential heat pump.
At the temps you are describing, you will need to rely on your LP furnace. We also used a portable electric space heater up front.
__________________
2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018.
2019 Grand Designs 384GK-R 5th wheel. Glen Allen, VA
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