Forum Discussion

mbrower's avatar
mbrower
Explorer
Apr 25, 2016

Roof top AC mounting??

My signature Fifth wheel has two coleman Mach series AC units. I have no inside mounting frame (that I can find anyways) and was curious if anyone has removed these type of units that could shed some light on how they are mounted to the roof. I would like to replace the seals and would rather have some insight rather than trying to figure out on my own. Thanks!!
  • Allworth's avatar
    Allworth
    Explorer II
    Apr 25, 2016
    I would go to the Coleman website and see if I could find an installation PDF.
  • Jerry_B's avatar
    Jerry_B
    Explorer
    Apr 25, 2016
    Mine is simply bolted to the roof. Take off your ac shroud and you will see four lag bolts near each corner. Piece of cake.
  • ksg5000's avatar
    ksg5000
    Explorer
    Apr 25, 2016
    There are a number of UTube videos on this subject - might help.

    On my rig when you remove the interior shroud you see 1" wide square metal frame which runs along the perimeter of the square hole. There are 4 bolts that run up into the roof air conditioner. You remove those bolts and disconnect the wires ... once that's done you can lift the upper air conditioner.
  • laknox's avatar
    laknox
    Nomad
    Apr 25, 2016
    When replacing the unit after installing the new seal, beware of overtightening the bolts/nuts, as this can crush the seal =too= much, causing leaks. Or so I've read on here about 'leventy-nine times... :-)

    Lyle
  • mbrower's avatar
    mbrower
    Explorer
    Apr 25, 2016
    Jerry B wrote:
    Mine is simply bolted to the roof. Take off your ac shroud and you will see four lag bolts near each corner. Piece of cake.

    I think this may be how mine is mounted. Thanks!
  • mbrower's avatar
    mbrower
    Explorer
    Apr 25, 2016
    Allworth wrote:
    I would go to the Coleman website and see if I could find an installation PDF.

    Tried this first. All the installation PDFs I could find showed the mount using a interior metal mounting frame which mine did not have.
    Thanks!
  • Learjet's avatar
    Learjet
    Explorer
    Apr 25, 2016
    Jerry B wrote:
    Mine is simply bolted to the roof. Take off your ac shroud and you will see four lag bolts near each corner. Piece of cake.


    Ditto with my Dometic Quite cool units
  • bpounds's avatar
    bpounds
    Nomad
    Apr 25, 2016
    Mine clamps to the roof. Pull the inside A/C shroud and you'll probably see the fasteners going up from below. There is nothing on the top side involved in holding mine on.
  • mbrower's avatar
    mbrower
    Explorer
    Apr 25, 2016
    bpounds wrote:
    Mine clamps to the roof. Pull the inside A/C shroud and you'll probably see the fasteners going up from below. There is nothing on the top side involved in holding mine on.

    i Think I have what they call a race track type plenum where both AC units dump into the same duct. Either AC unit can supply the whole coach but when both are working I have much stronger air flow. I like the design but all I have on the inside are small round supply registers and 4 small rectangular return ducts no where close to where the AC units are. The mounting bolts have to be outside under the shrouds.

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