Do all units have the roof weither they have a single A/c unit or 2?

Im concidering possibly putting a second unit on but it currently only has one central unit.

Rich, Some, like my Canyonlands, came without a rear vent or A/C. There is however, the framing and wiring to install a fan or A/C under the skin.

6cuda6 wrote on Sun, 01 September 2019 13:37

Do all units have the roof weither they have a single A/c unit or 2?

Im concidering possibly putting a second unit on but it currently only has one central unit.

my 77 didn't have any wiring or framing for the rear AC.
just a hole with the vent van.
I had to use some aluminum 1-1/2 x 1 " L to frame it and ran a wire to the fuse box .

All day affair. Had 3 of my kids and one granddaughter to help.

pjburt wrote on Sun, 01 September 2019 16:48

Rich, Some, like my Canyonlands, came without a rear vent or A/C. There is however, the framing and wiring to install a fan or A/C under the skin.

6cuda6 wrote on Sun, 01 September 2019 13:37

Do all units have the roof weither they have a single A/c unit or 2?

Im concidering possibly putting a second unit on but it currently only has one central unit.

Do all units have the roof weither they have a single A/c unit or 2?

Im concidering possibly putting a second unit on but it currently only has one central unit.

Our 76 Eleganza II has two DuoTherm units front and rear. The rear unit does interfear with the original rear-ladder/railing. In our case the piece that goes from the left had ladder rail to the railing section that goes across the back is missing. I think that the second unit was added some time after production, since I would assume that during production they would have move this railing section backward to clear the unit. Additionally the roof cross bracing is not the same. For the front unit the unit is boxed in with aluminum ribs while in the rear, the unit has small aluminum stand-off's like the front vent fan has to keep the unit's inside surface flush with the cieling. I currently have the cieling removed if anyone would like pictures.

Rich Kinas
76 Elaganza II
Orlando, FL

The 26" roof structure is the same in all the coach bodies. That means that there are 3 areas of the roof structure that you can mount either a vent fan assembly or an AC unit along the centerline of the roof. Typically the coach comes with a vent fan in the front location and rear location with an AC mounted in the center location. A 12/2 W/GRN is run to the middle opening and the rear opening has a 12/2t W/GRN in the foam coiled up, you have to kind of dig it out. The rear wiring is not terminated in the CB box, but coiled up inside the box. Most coaches only came with a center air and front and rear vent fans. A limited number had twin AC units with the front being a15500BTU and the rear a 13500 BTU unit. The wiring varies depending if you have 50 or 30 amp shore cable. For the coaches that have been converted to 30 amp power cords you can only run one AC unit. Coaches that have the 30 amp cord typically run a separate 20 amp cable that provides power to the rear AC unit on it own circuit if so equipped with second AC. The 50 amp cord can be your friend.

J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5' Stretch
75 GMC Avion (Under Reconstruction)
Michigan
> On Sep 4, 2019, at 9:49 AM, Rich Kinas via Gmclist wrote:
>
> I'll take some pictures tonight and post them. Also I was checking out the GMC Assembly manual which clearly shows that the single front A/C unit
> would be identified as RPO "CNL" and the Twin roof mounted units as RPO "CNV". The specification decal on the inside of the glove box for our 76
> Elaganza II shows "CNL602" which seems to verify only front roof mounted installed at factory. Also if you look at UPC 1C3 sheet 1 in the assembly
> manual you can see front and rear "hatch opening" where the A/C's mount. Also RPO UNR (UPC 1K3 sheet 29) is prewire Regular Production Option for rear
> roof mounted Air Conditioner. Your glove box sheet would show this option if the coach originally was wired this way.
>
> Rich
>
>
> --
> Rich Kinas
> 1976 Elaganza II
> Orlando, FL
>
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