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Old 08-18-2017, 07:25 PM   #1
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1995 Monaco Dynasty roof air change out

In the process of changing out the forward roof air on my 1995 Dynasty. Have the replacement AC, parts, etc., and plan to start tomorrow. Just wanted to get the horror stories before I got too deep into the process. Anyone changed out the obsolete Model 620215.321 with the model 3105712 thermostat with the furnace control?

Any and all input would be greatly appreciated.
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Old 08-18-2017, 08:38 PM   #2
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What AC unit are you replacing. The numbers seem to be duoTherm if so I would suggest that you compair the plugs for both units and if they are the same you should have no problem. If they are different note the wire colors and then check the wire colors on your thermostat. and on the thermostata it should tell you what each color does. The replacement is very easy four long screws hold it together just make sure you get the bottom gasket positioned correct and not twisted.
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Old 08-18-2017, 11:09 PM   #3
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Right, the unit being changed is an obsolete DuoTherm 13500 btu controlled with an obsolete monolog thermostat. Thanks so much for your input.
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Old 08-18-2017, 11:16 PM   #4
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Forgot to say that the replacement AC is a Dometic B59516 15000 btu recommended by Dometic. An installation manual was not sent with the unit. Downloaded from internet but it focuses on original installation instead of a replacement for an obsolete ac. Have new thermostat, adapters, etc.,and was just hoping to hear from someone that has actually experienced this installation before to verify flawless change out. LOL.
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Old 08-19-2017, 06:03 AM   #5
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Not sure what thermostat you are installing. Two years ago, we replaced ours with a new Dometic CCC2 unit. When we did, we had another problem. The thermostat is mounted on an outside wall and there is a small cavity behind the thermostat where the wires are run. The high temp in the wall meeting the cool air inside, created condensation on the thermostat's PC board which caused it to short out. To solve this I used low expansion spray foam in the wall cavity and placed a thin piece of sheet foam on the back of the PC board. Be sure to protect the connector leads when doing this. So far, everything is fine.
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Old 08-19-2017, 07:39 PM   #6
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I will use the Dometic model 3314082.011. Don't think that I will have problems with the adapters, wiring, etc. The major problem now is that the AC air outlet on the unit does not mate up with the ceiling duct. Having to do more research and possibly re-design the duct inlet.
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Old 08-19-2017, 07:40 PM   #7
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Also thanks for your input. Good to know.
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Old 08-20-2017, 02:13 PM   #8
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I replaced the front Dometic 13500 AC on our 97 Windsor with a new Domestic 13500 unit. The challenges were the coach had an obsolete 4 button Dometic thermostat. The new AC came with a control board designed for the 5 button thermostat. I had to purchase a new 5 button thermostat and a new 5 button compatible control board for the old rear AC unit.

After figuring out how to hoist the new AC onto the roof it was pretty straight forward. Use a new gasket. The new control board installs in a small compartment in the left front side of the old rear AC. It is under a small cover held on by 3 screws. All the wiring and the 4 main retaining bolts for the new AC are accessed from inside. Do not over tighten.

Make sure you set the dip switches on the new AC for the correct zone. Program the new thermostat by holding down both top and bottom buttons and turn it on. If you have the dip switches set correctly and the new control board in, it will all work.

I did not have any issues with the ducts. Are you sure you have the correct replacement unit?
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Old 08-22-2017, 09:50 PM   #9
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Quote:
Originally Posted by vito.a View Post
I replaced the front Dometic 13500 AC on our 97 Windsor with a new Domestic 13500 unit. The challenges were the coach had an obsolete 4 button Dometic thermostat. The new AC came with a control board designed for the 5 button thermostat. I had to purchase a new 5 button thermostat and a new 5 button compatible control board for the old rear AC unit.

After figuring out how to hoist the new AC onto the roof it was pretty straight forward. Use a new gasket. The new control board installs in a small compartment in the left front side of the old rear AC. It is under a small cover held on by 3 screws. All the wiring and the 4 main retaining bolts for the new AC are accessed from inside. Do not over tighten.

Make sure you set the dip switches on the new AC for the correct zone. Program the new thermostat by holding down both top and bottom buttons and turn it on. If you have the dip switches set correctly and the new control board in, it will all work.

I did not have any issues with the ducts. Are you sure you have the correct replacement unit?

Thanks for your input and sorry for not replying earlier. I am in an internet unfriendly area and I have to go to a central area to use the net.

All of the equipment that I just purchased was recommended by Dometic, not that that is unflawed. I don't think that the issue is the equipment more than it is the lousy job someone did when they installed this AC probably back in 1995 or so. It was a butcher job from the beginning starting with the AC support hardware and bolts securing the unit to the roof, and the sloppy duct tie in. Trust me it was really bad! I have been fabricating new hardware and trying to salvage the existing mediocre ducts but it looks like I am going to have to have a sheet metal duct expert to make the tie in to the new AC, which means the existing duct in the forward roof hole will be eliminated. C'est la vie. So be it. I was just hoping to find some poor soul that has had the same problem with a ducted unit that I am having now and could recommend an easy fix. Thanks again for your input. It was very informative.
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