Ductless Mini-split AC clearances - Fiberglass RV


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Old 04-19-2017, 12:39 PM   #1
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Name: Billy Sharpstick
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Ductless Mini-split AC clearances

The specs for the mini split units I've looked at call for considerable clearance to the rear of the outside AND inside units. Typically about 12" and 7" respectively. How necessary is that? having that much clearance on my 14' Burro is difficult. I'd like to mount the compressor unit on the tongue close to the camper body. Do they exhaust to the rear? And for the inside unit, I'd like to mount it right to the upper part of the front window, with appropriate support rails. If I try to mount it with 7" behind it, it will be hanging down so close to the dinette table that we will be bumping our heads on it.
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Old 04-19-2017, 12:53 PM   #2
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My unit requires clearance on top of the inside unit and blows out in front.
Look at my pictures because I don't have the total required clearances but it works ok.
Remember the RV is a LOT smaller than any room it might be mounted in.
U
The outside unit pulls air in at the side and rear.
I have clearance but not as much as the book calls for since air will also have airflow from under the trailer.
The LP tank sits in front, but it is round and I don't think it interferes much with the air flow.
I find that with the inverter control the unit rarely runs wide open anyway.
Usually the outside unit is just moving a small amount of air..
I wouldn't worry if you don't have the full clearance for the manual.
It may not be as 's efficient but it will probably be better than a rooftop unit anyway.
My unit is rated 20 seer and no RV unit I am aware of is that good.
My unit peaks at around 9 amps maxed out and has no starting surge since it is an inverter unit.
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Old 04-19-2017, 01:05 PM   #3
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Quote:
Originally Posted by redbarron55 View Post
My unit requires clearance on top of the inside unit and blows out in front.
Look at my pictures because I don't have the total required clearances but it works ok.
Where are your pics?
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Old 04-19-2017, 01:34 PM   #4
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Quote:
Originally Posted by sharpstick View Post
The specs for the mini split units I've looked at....
Seeing how this is a camping trailer forum and mini-split AC units are very rare on them (at least for now), you might also want to check over at HVAC-Talk: Heating, Air & Refrigeration Discussion

There are a number of true professionals in the HVAC field on that forum who are happy to help (and a few who might be quite aggravating).
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Old 04-20-2017, 10:20 AM   #5
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Quote:
Originally Posted by gordon2 View Post
Seeing how this is a camping trailer forum and mini-split AC units are very rare on them (at least for now), you might also want to check over at HVAC-Talk: Heating, Air & Refrigeration Discussion

There are a number of true professionals in the HVAC field on that forum who are happy to help (and a few who might be quite aggravating).
They have a fairly strict "No DIY" policy and I was encouraged to go elsewhere.
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Old 04-20-2017, 01:03 PM   #6
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Mini Split

Sharpstick,

I have a mini split in my home, it is great. If an HVAC manufacture of mini splits where to make a scaled down, RV specific unit they could become millionaires.

KVJ
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Old 04-20-2017, 02:07 PM   #7
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Installation of a Fujitsu 9RL2 120VAC 9000 btu in an Escape. Nice thread, good pics:

Custom Air Conditioning Retrofit - Escape Trailer Owners Community

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Don't drill holes, try custom storage you design: http://RVWidgetWorks.com
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Old 04-20-2017, 03:20 PM   #8
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Name: Wayne & Barbara
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Mobile A/C

For a truly custom made, or fitted, Air Conditioner that will fit in small spaces, yet have great performance, and be able to stand vibration under rough travel conditions, check out RedDOT Corp, from near Seattle, WA. RDAC.COM
They are a major supplier the the semi tractor/trailer, motor coach and bus, Agricultural, Heavy Equipment industries. As far as I know they use engine driven or hyrdraulic driven compressors. But may also use electric drined ones too. Your Ductless -Mini-Split systems are desighned for home use, where the components are not exposed to vibration and impact. The internal parts may fail over time in a mobile application. Likewise for "window" A/Cs
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Old 04-20-2017, 04:11 PM   #9
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Do a search for redbarron55 pictures.
I have my build in my albums and on many other threads on the subject.
I would post them here, but I am on my phone.
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Old 04-20-2017, 07:53 PM   #10
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Old 09-14-2018, 08:48 AM   #11
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I really like the tongue mount for both the condenser and the water heater. Well played!
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Old 09-18-2018, 01:44 PM   #12
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Name: Jamie
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redbarron55, I'm very interested in taking the same approach on our Casita. Can you post a picture of how you are running the duct work for the air?
I can't tell from the photo but are you running a 3" or 4" duct under the camper?
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Old 09-18-2018, 02:21 PM   #13
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Quote:
Originally Posted by saucesquatch View Post
...
I can't tell from the photo but are you running a 3" or 4" duct under the camper?
As I understand it, this is a duct-less system. You only need to run refrigerant and electrical lines, and a drain from the indoor unit.

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Old 09-18-2018, 02:39 PM   #14
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Ductless system there is a 1/2" and 1/4" refrigerant lines and a small 4 conductor cable (I think) for power and control of the system.
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