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Old 11-21-2011, 07:59 AM   #1
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Roof top heat pumps not working?

2007 Fleetwood Excursion, Staying Reno for Thanksgiving in the 20 at night. Roof top heat pumps put out no heat, Is this normal?
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Old 11-21-2011, 08:23 AM   #2
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There might be a low ambient lockout on them? I do not think a heat pump is going to work well under 40 deg outside.

I think I read in my owners manual that mine "lock out" under 38 deg outside?

Here is a post about outside air temperatures. Link

Maybe others will chime in.
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Old 11-21-2011, 08:32 AM   #3
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Just a general heat pump note. It's good to switch on Heat Pump mode about once a month year round in order to excercise the reversing valve.
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Old 11-21-2011, 08:37 AM   #4
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AS noted, it is in the Owners Manual about cold weather operation. Below about 40 degF, they will not work or they will lock out. Many have a small, 1500Watt electric strip heater to add some supplemental hear in cold weather.

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Old 11-21-2011, 09:13 AM   #5
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Yup what the others said. Heat pumps are not really usable below 40. Use your furnace or a portable heater.
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Old 11-21-2011, 09:58 AM   #6
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below 40 degrees our heat pumps will go into defrost cycles and put out very little heat.
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Old 11-21-2011, 10:04 AM   #7
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More than that, you can damage heat pumps (reverse cycle air) if they freeze up.
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Old 11-21-2011, 04:18 PM   #8
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I wonder if Fleetwood has any owners manuals for this MH?
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Old 11-21-2011, 06:44 PM   #9
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as others have noted . They will produce very little heat when outside temp is 40 or below
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Old 11-21-2011, 08:51 PM   #10
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As mentioned above, several times, your heat pumps will not work below about 40 degrees. I have heard claims of heat pumps working lower than that but they probably have heat strips in the as mentioned by Ken above. Most of the RV heat pumps do not have these heat strips. If you're in temperatures in the 20s you need to be running your propane/diesel heat. Heat pumps do not put any heat into the bays. Your propane/diesel, heating units normally will provide the heat nessesary to keep the wet bay from freezing. In the brand of unit that I have, it is the rear furnace that heats the wet bay.
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Old 11-22-2011, 12:02 AM   #11
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Quote:
Originally Posted by TXiceman View Post
AS noted, it is in the Owners Manual about cold weather operation. Below about 40 degF, they will not work or they will lock out. Many have a small, 1500Watt electric strip heater to add some supplemental hear in cold weather.

Ken
I have yet to see a heat pump with heating strips in them. On ours (Penguin 13.5's) there isn't even an option listed in the parts book for them. Besides, the heat strips give out very little heat, better off with a small heater.
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Old 11-22-2011, 12:54 PM   #12
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Quote:
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I have yet to see a heat pump with heating strips in them. On ours (Penguin 13.5's) there isn't even an option listed in the parts book for them. Besides, the heat strips give out very little heat, better off with a small heater.
The Carrier HP we had on our previous Bounder had heat strips for when the temp dropped below 38.

Some heat pumps work to lower tems than others. Dometic has some BriskAir units that work down to 20. For units to work below 40deg F they need sensors and controls to monitor for ice formation and control defrost cycles. Most of the roof top RV units use a simple switch for ambient air temp at 38 to 40 deg rather than bother with defrost. Most home units work down to 20 and many down to zero or lower.
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