Originally Posted by USMCJS
Well, it seems that the original buyer of our 17b did not feel they needed to wire the unit for A/C. At least Escape has checked the build sheet and so advised. So, my question now is ... has anyone here added an A/C to a 17b when the unit was not pre-wired for it ? It's beyond me why the original buyer would omit this but, apparently they did. Any advice appreciated.
Perhaps of interest ...
At ~6:35+ in the video below you can see how ETI routed a bunch of wires under the ceiling to the 14x14 opening for the roof-mounted AC when that's installed. You can also see the 'framing' in that area before the interior ceiling is installed. Note that the 14x14 opening in the roof of the shell is not cut-out at this point in the video, that comes later, keep watching the video for completion of the ceiling construction.
If indeed your 17b lacks that wiring, perhaps the video gives a hint how you (or an installer) might
, with a bit of innovative thinking and effort, be able to 'fish' the required wires hidden under the ceiling between the vent/AC opening and the overhead cabinet space after the vent-frame is removed to expose the perimeter of that opening/framing. Yes, it's quite possible that insulation installed between the framing in the ceiling will make all of this impossible, it's hard to tell if there's an air-gap between that insulation and the lower ceiling panel.
From review of that video, I'd be inclined to try it
by drilling a hole from inside the OH cabinet through the framing strip against the shell roof and 'fishing' from there toward the 14x14 opening. Not suggesting it'd be particularly easy, and it might be for naught, but the 'experiment' would be hidden inside the overhead cabinet.
IF you go with the roof-mounted Houghton unit previously mentioned you will only need to 'fish' a single
'romex' 3-wire power cable from the vent/AC opening to the overhead cabinet (and thence down to your electrical panel via the OH cabinet and behind the removable interior corner-trim in the trailer). That because the Houghton unit does not require any other 'controller/thermostat' wires since it uses a wireless remote for those functions - it only needs the single 3-wire 120VAC cable (+, -, neutral) power feed.
Lacking the ability to 'fish' that cable under the ceiling, IMO you're looking at routing that single power cable from the 14x14 opening to the nearest overhead cabinet space 'surface mounted' against the headliner .... and then doing your best to make that aesthetically acceptable with some sort of (glued-on?) strip of covering material. Perhaps not the solution you would prefer in an ideal world, but IMO 'workable'.
I'm sure there's other solutions, this just came to mind as I considered your challenge. Yes, there's the mini-split option which avoids the ceiling area entirely but IMO the roof-mounted Houghton already discussed is probably your overall easiest solution, IMO.