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Old 02-19-2015, 09:52 AM   #1
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Good morning

Here goes remember hearing the only dumb question is the one you don't ask? Well here's my question will the heat pump in the ac be damaged if I run it with the entire coach covered. The covers all breath but!!!! I do my starting routine each month and was thinking it would be a good idea to run whatever systems I could. I tried the furnace the other day but it was to cold and gas was liquid. Any comments are welcome thanks in advance. Steve Lambert
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Old 02-19-2015, 12:03 PM   #2
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No, you don't want to run the heat pump if there's no air circulation to the roof unit.

If it's too cold to run the furnace, it's certainly to cold to run a heat pump. You could damage the compressors.

Gas or Diesel rig? I don't know anything about Gas rigs, but you should NOT be doing a monthly startup on a Diesel rig unless you're going to run it long enough and hard enough to get completely up to operating temperature. Which you're certainly not doing if you're not taking the cover off.
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Old 02-19-2015, 05:18 PM   #3
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I agree, do NOT start unless you're going several miles down the road (10+ miles) to get the engine to operating temps. This has to do with getting oil throughout the engine. Does not happen until things get warm enough.

Never run heating/cooling appliances with clear air flow around them. Trying to run them under a cover will cause mucho dollars damage.
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Old 02-19-2015, 07:52 PM   #4
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Propane vaporizes/turn into a gas a -42 deg. F. There's another reason it would not run. Cycle it off/on several times and each time see it if lights. Heat pumps will not provide heat below 36-39 degrees.
If you cannot drive your MH for a minimum of 30 minutes, it's best to not start the engine at all. Idling the engine just forms moisture in the crankcase, moisture makes oil turn acidic, which is harmful to metal. The oil must get hot enough-long enough to vaporize the moisture.
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Old 02-19-2015, 10:59 PM   #5
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That's one reason I don't use a cover. The other reasons are I've seen them do more damage than good on vehicles I've owned -rubbing paint, mildew...And finally, I take the motorhome out and drive it and wash/wax it frequently. DP's and all Motorhomes do not like to sit.

Cheers!
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Old 02-20-2015, 08:39 AM   #6
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I was asked a question on a PM about needing to run a gas engine down the road similarly to a diesel engine. Here was my answer to that question:
Quote:
I do not know positively about a gas engine, but probably not as much as a diesel because the fuels are very different. Diesel fuel is much thicker than gas. Plus diesel fuel has to be heated to start properly. The oils used in a diesel engine are also different than a gas engine, plus the shear mass of a diesel engine is much heavier than a gas engine. The key here is that to efficiently lubricate a diesel engine it must get to normal operating temp. and this will not occur at idle speeds. A diesel must be run at speed down the road to heat up sufficiently to lubricate everything. I am not sure if this is true of a gas engine because the gas burns hotter, thus heating things up much sooner than on a diesel.
How ever I would not run a gas engine under a cover either. That is how some people commit suicide, but running exhaust fumes in a closed area.
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Old 02-28-2015, 10:37 PM   #7
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Doesn't matter if it's gas or diesel powered, the oil must be maintained at operating temperature for 30 minutes or longer (to evaporate moisture that forms in the crankcase soon after starting the engine) from the crankcase. If you can't drive it don't start it.

alpha99. You are right, most of the problems with motorhomes come from being stored instead of being driven.
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