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12-01-2014, 11:49 AM
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#1
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Montana Fan
Join Date: Mar 2012
Location: Campbell River
Posts: 194
M.O.C. #12359
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make of air conditions and wiring diagram
We have a 2012 Montana 3750FL, and had some work done on our roof where they had to remove the front air conditioner, we unfortunately, did not try the air conditioner after we got the trailer back. We are now in Arizona and when I tried to use the front air conditioner I got an error which states that there is an open ground, I looked through all of my literature on the 5th wheel but can’t find anything on the air conditioners, does anyone know what make they are and where I can find a wiring diagram. Thanks Michael
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12-01-2014, 12:28 PM
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#2
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Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,198
M.O.C. #13740
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I think they are all dometic, either 13.5 k btu or 15k btu, depending on where in the rig unit is located. Unless you are electric savvy, as well as understand how these work...you will be wiser to have a good mobile tech come do the fix. If you are attempting this yourself...power off, and if the unit is one that has an inside cover, then you have to remove the cover to see the approximately 5 by 7 box that has the circuitry to control the air conditioner. If nothing looks amiss so far, then you will need to remove a cover on this to expose the hot, neutral, and ground for 120 vac. If all are connected there, then it is roof side, remove cover, remove metal cover inside to get to the power connections there. You can fry your unit if you do something wrong. There is also a large capacitor in there that can kill you or cause you to fall off the roof if you get in contact with it. This is why you should contact a tech. John
__________________
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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12-01-2014, 12:43 PM
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#3
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Montana Fan
Join Date: Mar 2012
Location: Campbell River
Posts: 194
M.O.C. #12359
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Thanks John, I think that I will take you advice and leave it to a tech.
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12-01-2014, 12:48 PM
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#4
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Montana Master
Join Date: Oct 2009
Location: Indian Land
Posts: 1,142
M.O.C. #9808
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Michael,
The wire are accessible where the intake filter is. You will see a control box, and you should see wires going to a Romex Wire (kind stuffed back in the roof rafters. The connections are via wire nuts... check all three to make sure the wire are making good contact. They are just stuffed in there so you can pull them out to get a good look at them.
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12-01-2014, 01:06 PM
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#5
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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Yes, when they removed it, there would have been no reason to do anything but take the connections loose in the box you can access. They removed the thermostat wires as well, The thermostat may have to be re-booted.
Start there, that should do it.
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12-02-2014, 10:55 AM
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#6
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Montana Master
Join Date: Jan 2013
Location: Depends on temps
Posts: 1,648
M.O.C. #13157
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What others have said, they would have dis-connected the wires at the junction box that is available thru the return air area. Before you "dink" with this, make sure the breaker is OFF and the feed is dead.
Probably just a loose wire nut on the ground wire. I doubt the problem is on the roof connection.
Jim
__________________
2012 Ram Laramie 3500 DRW 4x4 3.73 Tow Max Pkg B&W Companion 60 gal RDS aux fuel tank. 2014 Montana 3150RL, 2 A/C's, Leather, 6 Point Jacks, Splendede WD2100XC, Mor/ryde X-Factor, Duravis 250 tires with TST 507RV monitors. 2 x Honda EU2000's
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12-02-2014, 02:24 PM
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#7
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Montana Fan
Join Date: Mar 2012
Location: Campbell River
Posts: 194
M.O.C. #12359
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Thanks Jim, John and Ozz I will have a look and before touching anything will disconnect the power, thanks for the tips.
Michael
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12-13-2014, 01:53 PM
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#8
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Montana Fan
Join Date: Mar 2012
Location: Campbell River
Posts: 194
M.O.C. #12359
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Just want to give an update, I did check the wiring, everything look to be connected, so had a tech come out he checked the wiring, then checked both roof airs after sometime going back and forth came back inside and discovered that one wire was plugged into the wrong connection. Re-set the thermostat and we now have both airs working. Phoned camping world and they said they would cover our costs. Good result, so many thanks for the ideas.
Michael
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12-13-2014, 03:14 PM
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#9
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Glad to hear you are up and running!
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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