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We have a Dometic B1900s on our caravan and the water from the outlet drain just runs all over the roof does anyone know if we can fix an outlet pipe to it to direct the drainage off the roof

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Yes you can modify the pipes. Just be sure that your pipes are installed at a downward slope to allow for the water to drain.

Posted on Feb 20, 2009

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2 Answers

I have a jayco pop up camper with a Duo-Therm BriskAir roof top a/c. im having problem with it leaking water inside of the camper? Is there a drain hose? Or wat do u think is wrong?Thanks


Yes there are drain holes in base of upper unit (on roof), which may be plugged. Couple of questions though to see if we can better troubleshoot this for you.
-Do you remember seeing water (condensation) running off roof before when AC was used?
-Have you cleaned filter inside at ceiling lately?

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My Dometic roof mounted aircon appears to discharge the water straight onto the roof. 1) Is this normal operation. 2) Is there a drain tube fitted, and if yes, where would I find it? Assistance will be...


Yes it is normal for AC to drain on to roof as the drain holes are in base of AC unit. The time to worry is when you don't see it draining on to roof, as this indicates holes may be plugged.

Jan 30, 2011 | Dometic Rooftop RV Air Conditioner

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My Dometic AC is mounted on a sloped roof (as are a lot today). However in humid weather when the AC is putting out a lot of water, the fast speed of the fan pulls water out of the evaporator pan and...


Clean air filter and evaporator coil periodically. And also insulate tightly for the pipelines including drain pipe also. The heat hose observe the water over the pipelines and evaporate. Thanks and helpful?

Jan 17, 2011 | Dometic Rooftop RV Air Conditioner

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I have a travel trailer with a coleman 7300 roof top ac unit. the unit will blow cold air but water leaks thru the plenum. i was told by the previous owner that it needs a new seal. i would like to fix it...


If it's leaking inside where filter cover is, then real good chance the drains being plugged is the only problem. If water (condensation) not running off roof when operating in cool mode, then I'd bet drains, which are located under unit on roof, and you should see them sticking down like buttons. They have a hole in side that needs cleaning with a pipe cleaner or similar to open them up. If need be, shut off power to unit and remove top cover on roof unit and look for the drain holes in base, and clean them out. If water comes in while raining, but AC not running, then it's gasket. That is remedied by removing ceiling assembly (just screws) and 4 bolts that pull/hold the upper and lower assemblies together, unplug wiring to upper unit, and simply lift it off, change gasket and re-install. Tighten those 4 bolts equally when gasket is aligned properly over hole, only until gasket is approx 1/2, original thickness. Plug harness back in and your done. (about an hours work.) Only other thing that may be wrong is styrofoam drip tray for cooling unit, under cover on roof may have a crack , allowing condensation to leak in. If that 's the case, you can try to find a sealant compatible with styrofoam to seal those cracks.

Nov 14, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

13.5 Dometic rooftop rv ac design has changed since I purchased 2006 Monaco Camelot rv. The collection cups leading to the drain line do not fit well on the roof seal and a good seal is hard to achieve. If...


I've not run into the problem your having yet, so I will apologize up front for asking you to furnish more information. These drain cups that I assume are little round pieces attached to the base of the unit where it meets the roof, were not common on dometic, but were common on Coleman AC units. Those are the outlets for condensation to the roof anyway, are they not?
Also, as far as gasket goes, no I wouldn't recommend using 2. We were always advised by manufacturer to compress gasket to half the original thickness when installing either Dometic, or Coleman (RV Products). Coleman at one time, had tabs under gasket that when gasket was compressed, and they touched the roof surface inside, that was far enough, which was approximately half the original thickness. Believe it or not, over-tightening is more likely to cause a leak. Stick with half original thickness, or close to it.

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1 Answer

My roof top RV air conditioner is dripping water inside my RV


Check run-of on roof & see if it's been reduced lately, it may just be a plugged drain at base of unit on roof.

Jul 29, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

ROOF TOP AC UNIT ON COLEMAN POP-UP LEAKS


Does water drip out of unit on the roof while running ? If you look under the unit on the roof, you should see one or two little drains sticking down., that may be plugged up. Piece of wire or something and poke in the holes on the sides of those drains to make sure they're clear. Usually there is a plastic/nylon pan on roof unit to catch that moisture, and drain it off. Could be overflow because of the plugged drains, or I have seen the odd one crack but not too much recently, mostly back 5 yrs ago or so they had a run of them.

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Thess units are designed to discharge the condensed water onto the roof under normal conditions. HOWEVER you should be able to have a sheet metal person make up a drain pan to fit under the unit.
You would ten need to add an additional gasket between the drain pan to roof and drain pan to A/C unit. The drain pan could have a hose connection attached to the drain pan. Try it, you might like it.
Also you may have to get longer screws to tighten down the A/C from below.

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why is our dometic roof top a/c on our boat draining water back into boat. is there a way to clean the drain?

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1 Answer

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It is not leaking. that is the condendensation it is pulling out of the air. It is suppose to leak on the roof and off the camper.

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