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06-29-2015, 06:20 AM
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#1
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Montana Fan
Join Date: Apr 2007
Location: Silverdale
Posts: 275
M.O.C. #7117
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Second A/C Install Complete
Hello all. I installed my second A/C on Saturday morning (Coleman Mach 8 low profile 15K BTU). To get the unit up on the roof I ended up opening my slides and backing my truck up to the big slide on the right side of the 5er. I set an extension ladder up in the back of the truck and braced it against the end of the bed towards the cab. I then extended the ladder about a foot beyond the top of that slide to make a "ramp" of sorts (with a blanket under the ladder so it did not damage the slide edge). I tied some straps around the unit (weight about 90 lbs) and attached a couple of 5 foot 1/4s crosswise to the bottom of the A/C to give it something to slide on and not damage the gaskets on the bottom of the A/C. I had a friend stay in the truck bed to guide it up and I went up on the roof of the 5er and slowly pulled it up the ladder. Once it got to the top I stepped onto the slide roof, grabbed it by the straps and gently set it on the roof of the 5er. The 4 bolts that came with it to attach it to the roof from the ceiling side were about a half inch too short to reach the bottom of the A/C from inside. They were 7 inches long and I needed at least 8 inches to get sufficient thread into the A/C. I went to Home Depot and of course they did not have 8 inch 1/4 - 20 bolts. I bought some 1/4 - 20 thread stock, took it home and cut 4 pieces 8 1/4 inches long. I put double nuts on the bottom side to make a bolt out of it that I could screw up into the bottom of the A/C and it worked fine. I snugged it down about a 1/4 inch to get a good seal on the gasket. The only other "rigging" I had to do was to splice into the junction box forward of the vent to get more wire length. The wires for the A/C were in there, but they were not long enough to be ran into the vent opening to get to the wiring area of the new A/C ceiling controls. I added about 2 feet of 12/3 to it and everything seems to be working well. I went up and scrubbed the roof again yesterday (using my favorite blue Dawn detergent). I purposely shot a little water all around the bottom of the new A/C unit to check for leaks. I went inside a few times after that to make sure it was dry and low and behold, it was! I am going to check the mounting bolts a couple of times after the first road trip to make sure they are staying snug, other than that...should be good to go! Thanks for the advice offered here. -Glenn
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06-29-2015, 06:35 AM
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#2
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Great post, super installation
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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06-29-2015, 07:22 AM
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#3
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Montana Master
Join Date: Aug 2010
Location: Washington Coast
Posts: 2,688
M.O.C. #10696
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Yep good post Glen,this will help anybody that wants to do the same,now when you go to the heat in EA Wash and Idaho the whole family will say Thanx DAD!! AHHHHHHH
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06-29-2015, 07:42 AM
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#4
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Montana Fan
Join Date: Apr 2007
Location: Silverdale
Posts: 275
M.O.C. #7117
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Thanks Mike and Jimmy. The only part I was "worried" about was getting up to the roof without breaking something. I was happy when that part was over.
Also- removing the Dicor sealant from the EPDM roof around the old vent was a little bit of a pain. I set up there about an hour Friday evening after work with some tools carefully scrapping and pulling to get as much off as I could. I think the Keystone folks purchase that stuff by the barrel because they don't seem opposed to using it. I could not get it all off without possibly damaging the roof, but I got is as clean and flat as possible to provide a good seal for the A/C gasket. -Glenn
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06-29-2015, 08:06 AM
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#5
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Montana Master
Join Date: Feb 2007
Location: Winfield
Posts: 7,327
M.O.C. #6846
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Good to hear, the best part of any successful installation occurs at the conclusion knowing that the job was done right (by yourself) and that the hard work is not only over but worth it!
Bingo
__________________
Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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06-29-2015, 09:07 AM
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#6
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Sounds like a great job and some thoughtful engineering.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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06-29-2015, 09:53 AM
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#7
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Montana Master
Join Date: Jun 2010
Location: Colorado Springs
Posts: 3,335
M.O.C. #10496
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Quote:
quote:Originally posted by bncinwv
Good to hear, the best part of any successful installation occurs at the conclusion knowing that the job was done right (by yourself) and that the hard work is not only over but worth it!
Bingo
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Well said! We think the same way on this subject.
__________________
2010 3150RL
LevelUp, Dual 6 volt batteries, Progressive Industries EMS HW50C, Honda EU2000i Generator, Bridgestone Duravis R250 tires, Torklift Glowstep Revolution Stairs, LED Tail lights
2015 RAM 3500 Laramie SRW LB CC Cummins 6.7L Aisin Trans B&W RVK3600
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06-29-2015, 10:15 AM
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#8
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,167
M.O.C. #6433
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So Glenn. What did you finally figure out about a circuit breaker for the 2nd AC?
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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06-29-2015, 10:18 AM
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#9
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Montana Fan
Join Date: Apr 2007
Location: Silverdale
Posts: 275
M.O.C. #7117
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Bill, I did find that there was indeed a separate 20 amp breaker in the panel for the second A/C. The writing on the panel was very poor and hard to make out but with voltage checker in hand and flipping a few breakers I verified what that writing was supposed to say. I then went though all of the breakers in the panel and made sure they were labeled properly. -Glenn
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06-29-2015, 01:09 PM
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#10
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Did you have any problems connecting the duct work and thermostat?
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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06-29-2015, 04:58 PM
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#11
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Montana Fan
Join Date: Apr 2007
Location: Silverdale
Posts: 275
M.O.C. #7117
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David, this one is non ducted and the controls are separate.
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07-14-2015, 11:46 AM
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#12
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Montana Fan
Join Date: Apr 2007
Location: Silverdale
Posts: 275
M.O.C. #7117
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Follow up- we are now back from our very warm trip over to central/eastern Washington and Idaho. At the second RV park I was at I only had 30 amp service, but I was able to run both A/Cs there by putting the fridge and hot water heater on gas. We weren't able run much anything else without turning off one of the A/Cs, but they ran fine on 30 amps without any other major draws. One A/C is a 15K and the other is only a 13.5K, so that might have helped a bit. Funny thing is that the new 13.5K unit (non ducted) put out much cooler air up in the bedroom. I could have hung meat up there even in the 100+ degree weather. -Glenn
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