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Old 09-13-2015, 11:16 AM   #1
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AC Question

Over the Labor Day weekend, we were camping at Ft Boonesborough State Park in Kentucky. The weather was quite miserable, with daily temperatures hanging around 95. We had our 2016 21BD in a site that got quite a bit of sun so as you can expect the AC (standard 13,500) had to work pretty hard. I had the Gizmos installed on both tent ends, but the trailer had a very hard time cooling. I ended up closing one of the bunk ends hoping to make a difference, which did help a bit, but still did not decrease the trailer temp to a level that I thought it would. Has anyone ever looked at the air returns on their units? It seems the holes in my ceiling are quite small when compared to the size of the return slots on the unit. I would expect when the AC is running at full steam that if you put a piece of tissue or paper up to the returns it would suck it up toward the roof - this did not happen. Before calling the dealer and possibly taking the unit back to the dealer for inspection, I would see what everyone else has experienced. Again I know it was very hot and expect the conditions to be quite taxing on the AC, but we have a less than 20' trailer that I would expect this size of AC to be able to cool efficiently even in 90 degree weather.

Thanks!
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Old 09-13-2015, 11:29 AM   #2
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If my 29HFS was at 95 degrees it would take a blue moon to cool it down to... say 78. And, I don't have tents on each end. The return air on the Dometic 13.5 is at the unit. MY unit is really 31 feet, but I close off 10 feet of it (the toy bay), so I am only cooling 21 feet MOL.

the AC will suck up tissue and hold it to the filter.

I've run a cord from generator in truck to trailer and run the AC while going down the road, in order to cool it before arriving and this was pretty sweet.

Also, did you try closing the flap to direct air from the unit, which closes off the ducts? This will cool it faster, too?
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Old 09-13-2015, 11:33 AM   #3
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Purely a guess, but if a piece of paper can not be held up against the register, then you have a leak in between the evap and the blower and sucking the air across. In case you ask what that means it means that you are not getting the correct drop.
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Old 09-13-2015, 11:38 AM   #4
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Thank you both for the reply. I did try closing off the ducts, which did help a bit, but the unit definitely still struggled. I had hoped by testing to see if a piece of paper would get sucked up to the returns would be a good measure to see if something is wrong, so I am glad to hear my assumption was correct. It sounds like I have a problem leaning toward a leak.
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Old 09-13-2015, 12:07 PM   #5
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Quote:
Originally Posted by jgoldwood View Post
Thank you both for the reply. I did try closing off the ducts, which did help a bit, but the unit definitely still struggled. I had hoped by testing to see if a piece of paper would get sucked up to the returns would be a good measure to see if something is wrong, so I am glad to hear my assumption was correct. It sounds like I have a problem leaning toward a leak.
You would have to drop the ceiling grill, then you should have a metal plate installed on the other end of the return. Alot of times like everything else things have not been installed correctly or missed. The blower can only suck from the filter area, any place else it will reduce your cooling drastically. If you can't remove the heat through the R/A then the transfer is not being made.
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Old 09-13-2015, 12:39 PM   #6
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"Air Returns"? That should be in the center of the a/c unit. Yours should be like mine, so I would take the filter covers off (should be too new to be clogged). But, with the thermostat set to Fan, check the suction. 95 (and probably humid as well) is pretty hard for our units to try to keep cool, but should get to a reasonable temp. I've closed the curtains on mine (never the bunks) and you should have on the a/c itself ducts you can open. If you open them, it reduces what comes out the ported ducts in your camper but really cools mine down quicker. Good luck.
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