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Old 07-07-2017, 12:57 PM   #1
epj
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Bedroom AC unit forming condensation inside.

40' Motorhome with 2 AC units. The one in the living room is perfectly normal. The rear AC runs quite a bit more than the front one. Mrs. J likes the bedroom cool. Anyway, the rear is forming condensate on the bottom of the plastic deflector that holds the filters, etc. the actual condensate pump is working fine. Big puddle at the rear where it discharges. It is very humid here in central Alabama. However, the other Motorhome we had didn't do this and this one didn't do it last summer that I can remember. Our local RV guru came out and replaced the gasket which did leak just a bit in a real downpour. He checked everything else out and said there should be no leaks. I don't think it is leaking from outside, or from the evaporator area. Any ideas of what to check? I did notice that the rear diffuser, or whatever it's called is a lot colder to the touch than the front one is.
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Old 07-07-2017, 01:41 PM   #2
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RV Roof top A/C Units drip condensate INSIDE when evap drip pan drain holes are clogged.

Not familiar with Phaeton set up....whether drip pan drains out onto roof and then runs off or down tubing thru coach to ground

But drip pan is overflowing......fan wheel pulling overflow into discharge plenum
Just remove air return filter and check drip pan level

Roof gasket may NOT have needed replacing.
4 hold down bolts are used to secure A/C Unit to roof.
Gasket is 1" thick and should be compressed to about 1/2".....hold down bolts are just 'SNUG' to do so.
They can vibrate loose.....SNUG is a technical term (40 INCH pounds----INCH not Foot) that is hand tight and then just a snug up with wrench

TOO tight.....gasket can get squished and block drain holes in evap drip pan


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Old 07-07-2017, 02:03 PM   #3
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The drip pan has a pump that removes condensate in a pressurized line that dumps at the rear of the coach. The line is open and the pump is working.
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Old 07-07-2017, 08:36 PM   #4
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Bedroom AC unit forming condensation inside.

The ducted system has a provision for simply opening the vents on what I call the diffuser. That seems to have solved the problem. I think the diffuser, or whatever the proper term is, was getting so cold that the super humid air was just condensing on the surface. We indeed had a leak coming from one corner of the gasket. It had to be raining very hard, but we had plenty of that lately. All seems to be good now.
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