Question about Mastercool 67680 Evaporative Cooler Air Conditioner

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When i run my rooftop unit, water runs down the outside of the roof jack and some leaks into the house

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Could be that the float is not set properly to where the water shuts off when filled. Make sure that you adjust the float so that water doesn't spill outside the pan when the unit is turned off. But that enough water is available so that your pump has enough water to feed the pads. If you run the pump dry, you may overheat and ruin it.
Also, make sure the ducts are properly sealed so water doesn't leak into the house.


Posted on May 10, 2010

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1 Answer

How do you remove front panel on unit?


It is highly likely that the condensate drain line is blocked and water is building up inside the unit. Find the drain line on the outside of the house and clear the blockage in the end of the pipe. The pipe typically just runs onto the ground, but may go into the gutters if the unit is on the roof. Occassionaly the blockage will be inside the indoor unit, but this is rare, so check the outside first.

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My coleman air conditioner 7300 series is leaking water on the inside


Water in an air conditioner is generally condensation building up on the indoor coil. This happens when the temperature of the coil is below the current dew point of the atmosphere. You have possibly two issues going on.

1) the condensation drip line, which carries the water to the outside is blocked or disconnected (most likely blocked with wet dust build up etc) and can typically be cleared by using an air hose to blow the blockage clear.

2) excessive water can be an indicator that you may have a slow leak in the refrigerant system. reduced pressures will lower the temperature of the coil causing it to condense more water, more frequently. While you might enjoy the seeming better performance of the unit, if there is a leak it will eventually reach a point where the water will freeze(cutting off the air flow so no cooling) and eventually stop working altogether. Have a certified technician check your system for leaks. Remember that most rooftop units use R-22 refrigerant, not R-134a automotive refrigerant. The wrong refrigerant in the system can be very damaging to components and seals, and can cause the unit to function improperly.

Jun 19, 2014 | Dometic Rooftop RV Air Conditioner

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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?

May 17, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

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

Water leaks from the roof unit


This is condensate (which of course is water) that is coming from your unit. This is very normal ... Is it leaking inside or running across the roof and down the side of your unit? If it is going inside, there is a drain in your roof unit that is clogged. You must clear the clog. Remove the cover and inspect the base. Turn the unit off first.

Sep 19, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

When set at coojest setting, water begins to pool on roof of my motor home


It is normal for water to come out of your unit. On some units there is a drain line if you take the top off of the unit you will see the line hooked to the condenser side (cold) of the unit. But most units just let water run out on the roof and run off. Your unit may have settled or if you have applied a sealant on your roof you may have changed the flow of the discharged water. The water is moisture that condenses from the air inside your rv. This should not cause you any problems unless you have a leak in your roof.

Aug 08, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

What would cause a rooftop a/c unit to leak water inside the trailer only when the unit is running?


Hi,
There is a drain to run the water outside and it is plugged...this units produces water when running as it dehumidifies the air...

Here is a tip about trouble shooting your air conditioner...

Air Conditioner Trouble -Review the Possibilities
http://www.fixya.com/support/r3571569-air_conditioner_trouble_review_the_possi

heatman101

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It is entirely possible that a five minute test would not produce any noticeable amount of water. Turn off everything in the house that is using electricity and your 20 AMP service will be sufficient to run your AC.

Jul 06, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

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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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3 Answers

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Either your 14"x14" a/c gasket is lose on the roof allowing the condensation to flow into your RV or you have a cracked condensation tray under the evaporator. I'm guessing the later

JGRV

Aug 01, 2008 | Dometic Rooftop RV Air Conditioner

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