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Old 07-04-2014, 04:52 AM   #1
Chuck P.
 
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340 RK Air Conditioner

Just Purchased a new 2013 Columbus 340RK. Have a single 15K Dometic Air Conditioner. System ran full time for 48 hrs in 80+ daytime outside temp and couldn't cool our unit to 75 except at night when temps got down to 60. Made sure all ducts were clear of Styro scraps, etc. Should I expect a single unit to adequately cool this trailer? Any suggestions?
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Old 07-04-2014, 05:35 AM   #2
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Same with our 2013 340 RK. Had the secon AC installed, seems to cool much better, but noisey. We are gonna see if they can look at it at Goshen.
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Old 07-04-2014, 06:50 AM   #3
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Lots you can do to improve the efficiency.

Pimp My Coleman Mach 3 AC

Also, make sure you are using the unit correctly. Sliding it to 65 degrees will not make it cool better; only make it worse.

I set mine at 10 degrees below outside air temperature (so it feels cool inside but has a chance to cycle and remove humidity without freezing up); 90 degrees max if outside temp is over 100.

If your AC does not cycle, it will ice up and slow air flow making the cooling effort worse. If you want it cooler; raise the temperature on the thermostat and you should see an improvement.
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Old 07-04-2014, 08:07 AM   #4
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One thing to check is the window seals near the bottom of the window in the living room area had at least a 1/2 inch gap where you could feel hot air coming in from the outside when the a/c was running had the seals replaced now on 90 degree days with the 15k a/c running it will cycle on and off


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Old 07-04-2014, 10:45 AM   #5
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If all else fails, install a 13K low profile in the bedroom.


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Old 07-05-2014, 05:43 AM   #6
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One other thing to look at. If you have floor heat outlets, try covering them up. We put a magnetic strip from Lowes on them. The cold air will drop and find its way into the basement area through the heater ductwork, unless you need a cool basement.
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Old 07-05-2014, 09:19 AM   #7
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Get the 2nd AC. We have the 2nd AC in our 320 & it takes both when temps at around or above 100. We like our temps no higher than 76 so we choose cool over quite. DW says 90 degree temps inside was why she gave up tent camping a long time ago.

We discovered ours will cool down faster (when arriving to CG on a hot travel day) if both AC's are put on dump for the 1st 30 minutes. Our Columbus does seem to take longer to cool down than our previous 5er. The 'C' is 3 ft longer & has 1 more slide, so maybe that is it. To help with noise; we turn off the BR AC if the outside air cools enough at bedtime. We have a low profile 13.5 in our our BR. I have read about a few that installed a 15 in the BR.
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