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Old 11-19-2010, 05:46 PM   #1
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Replacing A/C with Dometic Duo Therm

I have the old Armstrong AC off now I am preparing the top of the Argosy for the new AC. I have purchased a water drainage kit that anchors to the new AC but the way the directions state seems a bit tacky. The directions state to cut thru the foam gasket so the drain kit can anchor over the drain holes on each side of the new AC but that seems like it will cause leak problems in the future no matter how much caulking I put on it. Does anyone who has done this have any better suggestions on mounting the drain kit on the new Domestics AC? Thanks jjustice
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Old 11-19-2010, 07:00 PM   #2
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If you have the Dometic auxiliary drip kit # 3107688.016, then follow this procedure.

You do indeed have to cut a gap in the sealing gasket that is installed by the factory on the bottom of the unit. Install the cups first (you probably have to remove a 1/4" hex head screw near or underneath each the mounting location of each of the cups. Use a couple of TEK (drill point) screws to mount the cups to the underside of the A/C base pan centered on the drain spout.

Next, lay the drain hose on top of the gasket and trial fit it to the flanged spout so you know exactly where to cut the gasket.

Now remove the hose and cut the gasket right down to the base pan and remove the piece.

Install the drain tubing onto both drain fittings and be sure to attach the clamp BEFORE connecting to the fitting so it is already on the hose when you attach the hose to the fitting. Then move the clamp over the hose and fitting and it will make a tight seal.

Now completely fill in the gap you cut (a little over fill is fine) with Vulkem, SikaFlex 221 or any other good sealant like DAP. DO NOT USE SILICONE!!! Be sure to get your sealant under the hose as well by lifting it slightly and then re-seating it in the sealant. The sealant fills in the gap and completes the water tight seal.

The final step is to add the second gasket right over the original so that you now have a double layer of gaskets. It should be self stick...just peel off the paper and apply. It should be identical to the original.

You are now ready to install the unit on your roof. Tighten the 4 bolts from the underside so that the gaskets compress approx. 50%, connect the drain hose from inside the A/S and you are ready to install the air distribution box from underneath.

Have fun!
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Old 11-20-2010, 11:37 AM   #3
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Thanks a bunch for the info. jjustice
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Old 11-20-2010, 12:26 PM   #4
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One more question to you.

lewster,

One other question. Is it really necessary to add this drip kit? With the pain of having it leak on the roof anyway do the advantages outway the disadvantages?
Thanks for your comments
jjustice




Quote:
Originally Posted by lewster View Post
If you have the Dometic auxiliary drip kit # 3107688.016, then follow this procedure.

You do indeed have to cut a gap in the sealing gasket that is installed by the factory on the bottom of the unit. Install the cups first (you probably have to remove a 1/4" hex head screw near or underneath each the mounting location of each of the cups. Use a couple of TEK (drill point) screws to mount the cups to the underside of the A/C base pan centered on the drain spout.

Next, lay the drain hose on top of the gasket and trial fit it to the flanged spout so you know exactly where to cut the gasket.

Now remove the hose and cut the gasket right down to the base pan and remove the piece.

Install the drain tubing onto both drain fittings and be sure to attach the clamp BEFORE connecting to the fitting so it is already on the hose when you attach the hose to the fitting. Then move the clamp over the hose and fitting and it will make a tight seal.

Now completely fill in the gap you cut (a little over fill is fine) with Vulkem, SikaFlex 221 or any other good sealant like DAP. DO NOT USE SILICONE!!! Be sure to get your sealant under the hose as well by lifting it slightly and then re-seating it in the sealant. The sealant fills in the gap and completes the water tight seal.

The final step is to add the second gasket right over the original so that you now have a double layer of gaskets. It should be self stick...just peel off the paper and apply. It should be identical to the original.

You are now ready to install the unit on your roof. Tighten the 4 bolts from the underside so that the gaskets compress approx. 50%, connect the drain hose from inside the A/S and you are ready to install the air distribution box from underneath.

Have fun!
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Old 11-20-2010, 04:54 PM   #5
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Quote:
Originally Posted by jjustice View Post
lewster,

One other question. Is it really necessary to add this drip kit? With the pain of having it leak on the roof anyway do the advantages outway the disadvantages?
Thanks for your comments
jjustice
I would definitely add this drip kit. Allowing the A/C to drain on the roof will eventually leave discoloration marks in your aluminum. It's really no big deal to install one. generally takes me about 15-20 minutes.

Most large diesel motor homes use internal drain lines also, and I have to add a new drip kit to every one that I change out when being replaced.
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