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Old 03-02-2021, 11:29 AM   #1
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No roof a/c air flow

Iíve got a msg in for Thor and have posted this in the Thor forum. Nothing definitive yet. Hoping another Vegas or Axis owner has this configuration.
With the air plenum vents inside closed off, I have little to no air flow coming out of my ceiling vents, 2015 Vegas 24.1.
My Thor manual bag contains a manual for the Airxcel 13.5k.. Whatís on the roof is a Dometic 15k penguin II with heat pump. Date stamped 2014. This makes me think itís the factory upgrade?
Do I just need to take the air plenum off on the inside and see whatís blocking the air?
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Old 03-02-2021, 11:55 AM   #2
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I clean the filters every few weeks and leave the vents on the cover closed. I see yours are open.

What I did when I got mine, was take down the inside cover and use foil tape to seal the gaps between the intake and output air.
Otherwise it just pushes the air in circles, above the cover.
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Old 03-02-2021, 12:03 PM   #3
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Quote:
Originally Posted by twinboat View Post
I clean the filters every few weeks and leave the vents on the cover closed. I see yours are open.

What I did when I got mine, was take down the inside cover and use foil tape to seal the gaps between the intake and output air.
Otherwise it just pushes the air in circles, above the cover.
They are open because thatís the only way I can get any air out of the thing. As I said, when closed, I get nothing to speak of.. I have only one filter in the plenum assembly that you can eat off of..
do you have this unit?
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Old 03-02-2021, 03:27 PM   #4
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Talked with Thor and Dometic..Crazy town..
Thor shows my MH as having already received the Colman Mach 15 upgrade. I couldnít tell from the manual in my what this thing was. On the roof is actually a Dometic 15k with heat pump Penguin II (which replaced the BRISK). Thor is confident they did not put this on either as an upgrade or a warranty replacement. The Mach 15 upgrade by Thor doesnít include a heat pump or strip according to Thor. They guess the heat pump as the reason the previous owner upgraded it. However, it is installed with a non ducted ADB when it should really just have a return vent according to Dometic.. Before replacing the ADB, I will be pulling it off to see how I can adapt it to provide air to the ducts..
I let Thor off the phone before I could ask how they install these. On my previous MH, there was nothing on the ceiling. The row of vents on the drivers side were return vents and the row on the passenger side were supply vents. Still need to understand how the vents in the Vegas are used. Are they all supply with the return being in the ceiling cover?
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Old 03-03-2021, 03:47 AM   #5
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Did you purchase new or used? I used, sounds like someone has replaced the factory AC with a non ducted ceiling grill. Coleman units are purchased in two pieces, roof top component and interior grill component, Dometic probably the same.



Sealing joints in the duct/plenum will help. Here is some info on that:


https://www.irv2.com/forums/f121/ace...ml#post2697316


Here are some videos the may help with installation/removal:











May be easier to replace the interior grill with one that is configured for your application (ducted). Cheaper to modify you current grill if possible.
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Old 03-03-2021, 09:18 AM   #6
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Thanks Triplewide...the videos seem to be just what I need..
Interested to note (for me at least), Thor tells me that this is the ADB that should have been installed on my upgraded Mach 15. Itís designed to provide the return as well as a vent that can be opened to provide a straight shot of cold air out the bottom of the unit. When closed it directs air back into the ducted system. The Dometic ADB currently installed in my system may have been an attempt to provide the same option..Will open it up and see whatís going on in there before buying the return only grill. However, since my setup has nothing to do with Thor, I realize my results have no real value to others here.
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Old 03-04-2021, 02:47 AM   #7
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Good luck with it. Please post your solution. Someone down the road will appreciate it.
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Old 03-20-2021, 07:19 AM   #8
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Finished this job by installing the correct air distribution box for the unit on the roof. As Iíve already noted, the existing air handler was is NOT a good indicator as to what was installed on the roof. It was just the incorrect air distribution box, period. Now, after sealing and installing the correct unit, my air flow problem is solved. It will knock you over..
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Old 03-21-2021, 12:30 AM   #9
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Thanks for posing the solution!
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