How to Replace RV AC/HP Unit with Ducted Supply and Return

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This is how I replaced a broken Mach 8 HP/AC Unit with a new Mach 8 on a 2013 Tiffin Phaeton 42LH. In particular, I address the installation based on a ducted supply and return air system, which most Class A motorhomes use. I have done all three on my Phaeton 42, and it was much easier after doing the first one. It seems a little intimidating at first, but as you will see in the video, it is quite straight forward. Hope it helps.

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8 сен 2024

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Комментарии : 2

@ajfields5048 18 дней назад

Did your instructions tell you to add the spacers? Normally, the hold down bolts compress the seal attached to the bottom of the unit. I hope that your spacers do not prevent the seal from being compressed properly. I have been a certified RV tech for about 5 years, and I have never used a sealant, or had to remove sealant when removing an old unit, on the gasket because they are made to be compressed. Usually, I try to get about 50 percent compression of the seal. Because of the sealant used I'm sure you won't have a leak around the unit, I just think it was unnecessary to add spacers, extra strips across the unit and use sealant. Just my opinion, good luck and safe travels

@DEWalker-u6x 17 дней назад

Thanks for your comments. I didn't have any instructions for a ducted installation and could only find info on internet for down draft units. (Thats why I decided to do the video). I think this was my second unit I had to replace, and I eventually replaced all three. All of them were installed at the Tiffin factory with spacers and sealant (I didn't know if that was right or wrong), so I installed the new ones the same way. I did find some information with respect to the little strips on inside of seal, that were there as a compression guide, I assumed so they would not be over compressed. I misplaced the original spacers, so I made some with 1/2" pvc conduit and cut them the depth of the compression guide strips. All three installations went well, and I have not had any issues with water leaks. Again, thanks for your input, I appreciate it.