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Old 03-12-2013, 07:30 PM   #21
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Thanks! Is this doable by one person or should I have help standing by?
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Old 03-12-2013, 09:28 PM   #22
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Personally, probably good idea to have a 2nd person to help lift A/C.
One can go down and make sure everything looks good from the underside after its in place.
From a safety standpoint, on the roof with a heavy lift just makes good sense.

JMHO

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Old 03-13-2013, 05:22 AM   #23
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http://www.rvcomfort.com/rvp/pdf_documents/1976b520.pdf ... installation instructions for an AC unit close to yours - maybe the same. Figure 5, Item C explains the compression of the gasket. The tabs are usually yellow.

You seem to have a good knowledge of repairs so this doesn't have to be said, but if it were mine ... make sure seal surfaces are smooth and clean, place AC unit STRAIGHT down on gasket to eliminate any movement (2 people becomes a good idea at this point), "snug" the mounting bolts.

Coleman / Airxcel describes the seal as "optimum" when the indicating tabs are even with the roof (that doesn't take much torque). Also, that leaves room for further compression in coming years.

I would just snug the bolts on the ceiling unit as well. They don't need to be tight, and it makes it easier to get in and snug everything up later.

I sure hope you'll keep us informed.
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Old 03-13-2013, 04:28 PM   #24
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Thanks for the link, that is very helpful. It does seem this would go better with two people. The gasket actually arrived today, if the weather holds I'm hoping to get this done Friday. This one seems to be of a slightly different material, hopefully that's a good thing
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Old 03-14-2013, 06:21 PM   #25
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Well, the new gasket is on and the AC sits a good 1/4" higher than it did before. The old gasket was VERY compressed, probably more than it should have been, it was barely 1/4" thick in places. One of the "drains" was actually starting to rub through the roof The white part is gone in a very small spot and the black is showing through. Not sure why it had been tightened so much, It looks much better now and it's centered. I am fairly certain it was leaking because it had been over tightened. The new gasket is also more "dense" than the old one, it did take a bit to get it compressed to the tabs, but its very even all the way around now. Along with using the tabs, I also took measurements at all 4 corners between the AC base and the mounting plate, they are all equal. I also replaced all the pads on the rear half of the AC, the ones that were on it were all but flat.

Pics of the old gasket

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I did actually do this by myself, there really isn't much room up there for two people and it really isn't all that heavy. I did have my son help guide it into place from inside, that was very helpful.

I dumped some water out of a bucket around it, so far so good. Tomorrow I am planning to wash the roof, that should be a good test.

Thanks again exjay1 for taking all the pics, they are very helpful.
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Old 03-14-2013, 06:50 PM   #26
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Great job Amabee,
exjay1's write up with be most helpful to many people as we run into this issue.

Best regards,
Doug
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Old 03-15-2013, 06:32 AM   #27
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Good job! Quite a difference between the two gaskets side by side huh?
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Old 03-15-2013, 04:19 PM   #28
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Quote:
Originally Posted by exjay1 View Post
Good job! Quite a difference between the two gaskets side by side huh?
Yep, almost scary. And it passed the roof cleaning test, lots of water, NO leak! Now its up to mother nature to give it a real test, but I think it will be OK.
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