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Old 12-26-2014, 11:48 PM   #1
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Repaired A/C Installation

While going through our rear A/C unit checking all the seals and fasteners to correct a water leak we have in our Rear Bedroom Light fixture I found another issue with the A/C unit installation

What I found was the foam that fills the space and seals between the Air Conditioner intake / return from the registers and supply to the vents.

With this foam out, the air flow just circulates in a loop from the supply side back to the return side of the A/C unit.

This will make a significant difference in the A/C Unit performance.
This would explain why we had problems with our A/C keeping up during the summer heat here in the South.

Rear A/C unit with foam seal out of cavity


Front A/C unit with the foam strip out of cavity



Rear A/C unit with foam replaced and foil tape applied to keep it sealed between the supply and return.

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Old 12-27-2014, 03:34 AM   #2
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A buddies heartland had the same issue !!!

basically the return was sucking in the cold air and it wasn't taking it from the coach !
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Old 12-27-2014, 03:47 AM   #3
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Yep, instead of sucking the warm air in from the filter grills and cooling it, the cold air from the supply is going back into the intake side.
Hope the A/C system works better when the warm summer air gets here, it should work quite a bit better.
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Old 12-27-2014, 04:19 PM   #4
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Curious how you accessed that part of the AC? Did you pull down ceiling?
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Old 12-27-2014, 05:31 PM   #5
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I had the same question Atom.
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Old 12-27-2014, 05:34 PM   #6
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Quote:
Originally Posted by atom ant View Post
Curious how you accessed that part of the AC? Did you pull down ceiling?
Nope AA, you go up on the roof, remove the top / outside plastic cover from the A/C unit, then remove the front metal cover on the A/C unit and it exposes the intake side (you can see all the way down to the roof intake plenum) and front side of the cooling coils that the air is sucked through.
In the center you will see the divider between the two sides of the A/C unit (Intake & Supply). The Roof framing requires a gasket / seal of some type to keep the two cavities divided so they use a piece of foam with sticky tape on one side to hold it in place. The tape did not hold and the foam got sucked up into the cooling coils on the intake side.
(On the front unit, the Romex wire for the A/C unit power was embedded in the foam gasket that seal the two cavities.)

I always wondered when one unit was running why I could feel air blowing out the side intake registers of the other unit.
Now that the A/C units have been sealed between the intake and the supply output like they should be, we have a much better air draw at the side intake registers with the filters and now I do not feel any air coming out of the intake registers of the unit that is not running.

Since temperatures have been very mild the last few days, will not be able to see if the fix will improve A/C performance but I believe it is going to make a significant difference in our A/C performance.
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Old 12-27-2014, 05:38 PM   #7
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Thanks Robert! I feel much better that these can be serviced now. I used to think they had to be removed from the roof to access anything on the bottom.
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Old 12-27-2014, 05:48 PM   #8
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Quote:
Originally Posted by atom ant View Post
Thanks Robert! I feel much better that these can be serviced now. I used to think they had to be removed from the roof to access anything on the bottom.
AA, it looks like you can service and clean the coils on the intake side and access all electrical components from the top, it appears the only thing with no access from the top without removing the unit is the supply area and duct plenum below.
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Old 12-27-2014, 05:53 PM   #9
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Quote:
Originally Posted by johnboytoo View Post
A buddies heartland had the same issue !!!

basically the return was sucking in the cold air and it wasn't taking it from the coach !
I could see this issue on one unit as a mistake at assembly, but I had the same issue on both units.

Guess I would find it hard to believe I am the only Redwood owner with this issue, makes me wonder if some of the other forum members that have had A/C performance issues in the hotter climates have the same problem?
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Old 12-28-2014, 01:02 AM   #10
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That's the great part of this forum, someone figuring out their own issues & a relatively simple solution & sharing it with all of us. It sure has saved my bacon several times. I would like to give all a great big ATTABOY!!
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