Tips On Removing A/C Roof Cover

[mecsim]

My Rockwood trailer has a Dometic roof A/C unit, non-ducted. The unit is vibrating badly when running -- worse on med and high. I believe dirt daubers may have built a nest on the blower wheel, causing the fan wheel to be out of balance. Does anyone have any tips or things to watch out for when removing the A/C shroud so that I can access and clean the wheel ? Is it fairly easy to get to the screws and remove ? I plan to put plywood on the roof to get to the unit -- don't want to risk damaging the roof from walking on it.

Any other things that could be causing the bad vibration ? Are there any other holddown screws or bolts that should be tightened while I'm up there (or inside for that matter) ?

I do remember turning the A/C on in the past, and pieces of dirt and bugs have blown out. That's why I think the dirt daubers are the culprit. I also had to dig two big nests out of the hot water heat flue, so I know they are around the storage location.

[youroo]

Cover pan hd bolts come out and then the cover lifts off,easy part. Clean fan blades and cover inside &out. Go to Dom.Site above and it tells you how to check & tighten the unit,WATCH to NOT overtighten the GASKET! Youroo!!

[rattleNsmoke]

There should be two Phillips pan head screws on the rear sides and two up front sorta underneath. Really easy to get to. Bring up a pail of water or garden hose and fill the drain pan to make sure all drains are free of debris\leaves\bugs etc.
Check your fan blades really well. Wiggle the impeller housing to see if it's unusually loose (just a thought), like you mentioned if there's anything stuck to them and retighten the unit with the long pass-thru bolts as per Dometics instructions. There's not much else that can go wrong up there. Let us know how you make out.

[mecsim]

Does anyone know if you can get to both fans from the roof ? I looked at the exploded diagram and see that the condenser fan with the large blades should be exposed and easy to get to. It wasn't so obvious for the evaporator fan (the one that blows the air into the trailer). Do you have to remove a metal cover or housing to gain access to the blower wheel ? Or will the blower wheel be visible by just removing the large plastic housing ?

[VinceU]

Originally Posted by mecsim

Does anyone know if you can get to both fans from the roof ? I looked at the exploded diagram and see that the condenser fan with the large blades should be exposed and easy to get to. It wasn't so obvious for the evaporator fan (the one that blows the air into the trailer). Do you have to remove a metal cover or housing to gain access to the blower wheel ? Or will the blower wheel be visible by just removing the large plastic housing ?

The open impellor under the roof cover is the condenser fan. The cage evap fan is inside and should not need cleaning if filter is in place.