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Old 08-09-2018, 09:27 AM   #11
boxcar
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Mystery is over - I have the Coleman Mach 15 verified by my user manual and the model number under the shroud. Dealer is looking at the airflow today and installing (I hope) a second Mach 15.

Thanks for all the help!
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Old 08-09-2018, 11:26 AM   #12
KOZKO
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Looks just like my Coleman Mach 15 at the rear of our camper. If you are adding up front be careful about heights. The Mach 15 is tall! I installed a Dometic Penguin II because I was afraid of being too high. It is a different brand but same color, but up to you. I also, chose the penguin because I read a lot of reviews that the Coleman Mach 8 is very loud and I also confirmed this with Coleman - their tech service agreed it was much louder than the Mach 15.
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Old 08-10-2018, 05:02 AM   #13
boxcar
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Apparently I just expect too much.

The dealer (Keystone authorized warranty center) checked out my original air conditioner by feeling that cool air was coming out of the vents. The tech's statement was that it seemed cool in the 90 degree heat that day. The service manager said that 4 degrees drop from outside temperature in the 93 degree heat (my measurements from before) was within Coleman specs and about all you can expect on a unit that is more than 30' and you have to have a second air conditioner.

Secondly, they installed the unit nose down when the manual clearly states it must be installed no more than 15 degrees nose up but never nose down at all. Service manager states that he always installs them nose down and can get an exception from Coleman. I will follow up on that.

Third, dealer had said this wouldn't make my unit too tall as it was on the sloped front of the camper. My 297FWRLS height spec is 12.5' and I've never measured it, but it looks to me as though this will put me above 13.5'. Now I wish I'd have gone with the Mach 8 in spite of the noise.

Forth, and this is good, I only have a 30amp outlet on the outside of my garage (will install a 50amp today) and the second unit works. I thought it would only come on when the 50amp receptacle was in use so I have some things to learn about the electrical in my unit.

Finally, I love the unit and it's really cold. Now I have to go through all the ducting fixes others have posted on the forums before I head out to western Colorado next week. I have my inspection camera and insulation all ready and will order some high-flow vents today. I already know my bedroom duct extends well past the bedroom outlet.
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Old 08-10-2018, 10:20 AM   #14
PSD Andy
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Our Sprinter measured 12 feet 10 inches when I checked it on flat driveway slab hitched up to the truck. Long 2x held level on top of the mach 15. Trailer tows close to level wirh small bias towards nose high.

I was planning to use the mach 8 over the bedroom so we stay at that height. Now after reading the other post maybe the low profile Dometic is preferred? I might be able to use the Mach 10 but I'd have to check that with a level 2x to see where the height would be.
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Old 08-10-2018, 08:07 PM   #15
boxcar
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Thanks for that info Andy. I'm backed into the drive at my farm garage and not level at all so I can't do the same measurement you did.

I had to wait for dark and used my laser level to determine that the top of my front Mach 15 is 10 inches higher than the top of my rear Mach 15. That will put the camper at a semi-trailer height, 13'5". Of course I need to verify that when my camper is on level ground - probably out at the barn where I have a 15' high door.

I'll sleep better tonight believing that I'm not too high for standard overpasses.

I worked this afternoon on the main A/C. The endoscope revealed that the air ducts are all intact and I didn't see any significant issues. The metal tape is actually quite well done in the circular ducts. As others surmised, my plenum between the intake and exhaust needed work as there were some holes, but not the major cavity that others have reported.

The biggest issue was the cover built by Coleman (now Airxcel). The foam inside was fairly messed up. I replaced it all with rubber foam of a similar thickness.

Interestingly, the fiber board blocking the supply from the intake needs to be slanted to keep the maximum opening for the supply to the air ducts, at least from the position that my panel is screwed in. But I got it done and the air flow is great - now I have to maintain my objectivity because I'm convinced it's working right. I cut one of the grandkid's styrofoam noodle to block the air duct that goes past the front vent - he won't miss the 8" until next summer.

The nice surprise is that I kept the camper at 78 degrees throughout with only the new bedroom Mach 15 on high cool and a fan blowing into the living area. High of 90 today, but having the backup A/C could make a difference if one fails during a camping trip.

With the 50amp circuit and both A/Cs running, it's too cold. I'll test tomorrow when it gets hot again, but I'm pumped!

One oddity - the Airxcel thermostat reads the temperature that I measure at the top of the thermostat housing, and that's a good 3 degrees warmer than the wall next to it and the bottom and sides of the thermostat housing. That skews my earlier testing as I'd never noticed it. Does anyone else have similar differences on the thermostat?
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