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07-21-2012, 07:51 PM
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#1
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Senior Member
Forest River Owners Club
Join Date: Jun 2012
Location: Central PA
Posts: 734
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Water dripping from A/C ceiling return grille
Hi all,
I just installed a new rooftop air unit (Coleman Mach 15). All was going reasonably well until today, when I decided to run the air while giving the inside of the rig a thorough cleaning.
After running it for maybe an hour or two, I discovered quite a lot of condensation dripping from the main ceiling return grille (this is a ducted rig). I took the grille and sheetmetal cover off and found that there was a lot of sweat accumulated on the metal surfaces of the A/C unit, and also on the tubular metal framework that Jayco uses to reinforce that part of the ceiling opening.
I'm guessing this isn't exactly normal, but I'm not really sure what one does about it, and I don't see anything obviously wrong. Does anyone else have this problem? There is "normal" condensate dripping steadily off the roof exterior (as you would expect), so I don't think its a case of the regular condensate getting into the interior. I think it's only sweat generated from the inside / bottom surfaces of the A/C unit.
Any thoughts?
Thanks very much!
__________________
Steve & Carol
2014 Forest River Georgetown 351DS pushed by 2014 Jeep Wrangler (JKUR) 6-speed
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07-21-2012, 08:00 PM
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#2
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Senior Member
Fleetwood Owners Club
Join Date: May 2012
Location: NC
Posts: 1,682
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While you were cleaning were you going in and out of the unit often like to carry stuff in to the house if so a lot of humid air was coming in and it will sweat at the return until the A/C removes all the humid air out of the unit.
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Mark Anderson - Nebo NC - western NC - RV Restoration tech - 9 Doggies - Outdoors person
1990 33ft Wilderness Cimarron 33X
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07-22-2012, 05:29 AM
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#3
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Senior Member
Join Date: Apr 2012
Location: Louisville, KY
Posts: 1,489
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Sounds like you have some sort of outside air coming in where it shouldn't. Make sure the seal between the cold air return isn't pulling in outside air.
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Mark Anderson - FMCA 351514 - NRVIA Certified Level 2 Inspector
Louisville, KY
2011 Tiffin Phaeton 40QTH
2006 Jeep Commander
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07-22-2012, 05:43 AM
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#4
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Community Administrator
Join Date: Aug 2009
Posts: 53,432
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A clogged drain hole or a bad ( poorly installed ) gasket will cause the situation you describe.
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Cliff,Tallulah and Buddy ( 1999-2012 )
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07-22-2012, 10:29 AM
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#5
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Senior Member
Forest River Owners Club
Join Date: Jun 2012
Location: Central PA
Posts: 734
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Thanks for all of the suggestions... I went back up on the roof today and pulled off the shroud as well as the sheetmetal over the evaporator core. Everything looked fine and the drain holes for the plastic evaporator pan (onto the roof) had water drips, so I think they're working okay. I re-smooshed some of the "dumgum" in a couple of places and also added some additional aluminum duct tape in a couple of spots where I thought outside air might get in.
I really wonder if it wasn't caused mostly (as nightrider said above) by coming and going, as well as some additional dampness from my cleaning activities. I'm going to run the unit for a few hours today and see what develops.
Thanks again!
__________________
Steve & Carol
2014 Forest River Georgetown 351DS pushed by 2014 Jeep Wrangler (JKUR) 6-speed
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07-22-2012, 12:14 PM
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#6
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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On my coach the Carrier Air Vs will drip into the house via the intake vent/filters if the front of the coach is not high enough.. Try raising the front 1-2 inches and see if that helps.
Water is SUPPOSED to run out the back of the tray, not the front. But water runs DOWNHILL. even on Mystery Mountain.
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Home is where I park it!
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07-22-2012, 01:57 PM
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#7
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Senior Member
Forest River Owners Club
Join Date: Jun 2012
Location: Central PA
Posts: 734
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Quote:
Originally Posted by wa8yxm
On my coach the Carrier Air Vs will drip into the house via the intake vent/filters if the front of the coach is not high enough.. Try raising the front 1-2 inches and see if that helps.
Water is SUPPOSED to run out the back of the tray, not the front. But water runs DOWNHILL. even on Mystery Mountain.
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Thanks - I just checked and it was slightly nose-down. Will level out & try again.
Another observation: it seems that all of the water is on the blower side, not the return side. Some appears as beads of condensation on the metal and white foam up near the fan. I'm also wondering if the fan is actually pulling condensation off of the evaporator core and through into the blower side. I'm trying running the fan on low to see if that makes much difference.
__________________
Steve & Carol
2014 Forest River Georgetown 351DS pushed by 2014 Jeep Wrangler (JKUR) 6-speed
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07-22-2012, 06:21 PM
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#8
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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Yes the fan (Blower) will pull condensate through the coils, I mean it's approaching tornado velocities up there. Not a problem designed that way, Keep fan on high.
With the nose down water can overflow the front lip of the drip tray.
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Home is where I park it!
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07-22-2012, 07:50 PM
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#9
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Senior Member
Join Date: Apr 2012
Location: Knoxville, TN
Posts: 185
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It's most likely high humidity from the door opening and closing. I experienced this very same thing last week... got 4 drops formed on the ceiling package from running in and out and shampooing carpet, etc. And I've had a rash of calls wanting on site rv service for the same thing.
__________________
1997 National Seabreeze 133 Limited
1993 Mazda Miata
2005 Basset Hound, "Fred"
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