Reply
 
Thread Tools Display Modes
 
Old 03-02-2017, 11:48 AM   #1
Bus Geek
 
Join Date: May 2016
Location: Eastern WA
Posts: 4,542
Year: 2002
Coachwork: Bluebird
Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
Mini-Split A/C install question?

Hey Everyone,

As I watch the last of the snow melt I am contemplating the obvious... Air conditioning.

I am seriously considering installing 2 x 12k Btu mini-split's:

https://sharkaire.com/epages/fd93bb6...f7/Products/12

The units come with copper lines that, as best I understand, are not the best choice for mobile installation.

I wonder if it is practical to replace those lines with an automotive type of refrigerant line?

If so, what type of line & fittings?

Any special steps or precautions I need to consider?

Any other thoughts?

Thanks.

S.
PNW_Steve is offline   Reply With Quote
Old 03-02-2017, 12:04 PM   #2
Bus Crazy
 
Join Date: Sep 2016
Location: SE Florida
Posts: 1,064
Year: 2003
Coachwork: International
Engine: T444E
Rated Cap: 65 pax
These are exactly what I am planning on installing, so I'm looking forward to the responses you get.
Sandi
www.thismidwifetravels.com
Living full-time on my Skoolie.
WanderWoman is offline   Reply With Quote
Old 03-02-2017, 12:16 PM   #3
Bus Crazy
 
Njsurf73's Avatar
 
Join Date: Jan 2017
Location: Massachusetts
Posts: 1,497
Year: 2002
Coachwork: Bluebird
Chassis: Bluebird
Engine: 5.9 Cummins 24v
Rated Cap: 72 pax
Quote:
Originally Posted by PNW_Steve View Post
Hey Everyone,

As I watch the last of the snow melt I am contemplating the obvious... Air conditioning.

I am seriously considering installing 2 x 12k Btu mini-split's:

https://sharkaire.com/epages/fd93bb6...f7/Products/12

The units come with copper lines that, as best I understand, are not the best choice for mobile installation.

I wonder if it is practical to replace those lines with an automotive type of refrigerant line?

If so, what type of line & fittings?

Any special steps or precautions I need to consider?

Any other thoughts?

Thanks.

S.
I don't know if you have looked and decided that 2 units are best, but they make double splits... One "outdoor" compressor and 2 indoor condensers. Less space taken up by 2 seperate units. As for the copper, I am interested to hear opinions on that as well.

Sent from my XT1254 using Tapatalk
Njsurf73 is offline   Reply With Quote
Old 03-02-2017, 12:21 PM   #4
Bus Geek
 
Join Date: May 2016
Location: Eastern WA
Posts: 4,542
Year: 2002
Coachwork: Bluebird
Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
Quote:
Originally Posted by WanderWoman View Post
These are exactly what I am planning on installing, so I'm looking forward to the responses you get.
Sandi
www.thismidwifetravels.com
Living full-time on my Skoolie.
I would call this a bit on the "experimental" side. I have seen a few folks do it and I like what I see so far.

No "lumps" on the roof.

More control over where I place the air handlers

QUIET!

Much more energy efficient than roof air.

MUCH lower startup current draw than roof air. This means you can run them on a much smaller generator or inverter. It looks to me like, with some care, I can run two of them on a 3-4kw generator.

I plan on putting the outdoor units in the (modified) storage bays.

Grab some popcorn, sit back and watch
PNW_Steve is offline   Reply With Quote
Old 03-02-2017, 12:23 PM   #5
Bus Geek
 
Join Date: May 2016
Location: Eastern WA
Posts: 4,542
Year: 2002
Coachwork: Bluebird
Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
Quote:
Originally Posted by Njsurf73 View Post
I don't know if you have looked and decided that 2 units are best, but they make double splits... One "outdoor" compressor and 2 indoor condensers. Less space taken up by 2 seperate units. As for the copper, I am interested to hear opinions on that as well.

Sent from my XT1254 using Tapatalk
I have looked at the "Double 12k" units and the outdoor unit would not fit the available space as well and I like the idea of a bit of redundancy.

Good thought though.

Edit: I think the condenser is outside and the evaporators are inside. Do I have this right??
PNW_Steve is offline   Reply With Quote
Old 03-02-2017, 01:03 PM   #6
Bus Crazy
 
Njsurf73's Avatar
 
Join Date: Jan 2017
Location: Massachusetts
Posts: 1,497
Year: 2002
Coachwork: Bluebird
Chassis: Bluebird
Engine: 5.9 Cummins 24v
Rated Cap: 72 pax
Quote:
Originally Posted by PNW_Steve View Post
I have looked at the "Double 12k" units and the outdoor unit would not fit the available space as well and I like the idea of a bit of redundancy.

Good thought though.

Edit: I think the condenser is outside and the evaporators are inside. Do I have this right??
Probably. I am not an HVAC tech, by any stretch of the imagination lol

Sent from my XT1254 using Tapatalk
Njsurf73 is offline   Reply With Quote
Old 03-02-2017, 02:15 PM   #7
Bus Crazy
 
Join Date: Feb 2012
Location: Salt Lake City Utah
Posts: 1,538
Year: 2000
Chassis: Blue Bird
Engine: ISC 8.3
Quote:
Originally Posted by PNW_Steve View Post
I think the condenser is outside and the evaporators are inside. Do I have this right??
Yes that's right. I always have to pause and think it through... At the indoor unit, heat from the room causes liquid refrigerant to boil into gas. It evaporates. Likewise at the outdoor unit refrigerant gas is compressed which makes it very hot, and as it cools it forms dew drops inside the pipe.. condensate.. and turns to liquid again.

I know you're not quite in a big metro area so this may not be much help, but I'd expect an industrial hose supplier could make an R410A compatible hose to your spec. Here in Salt Lake I routinely have hydraulic, brake, air, and other hoses made at Evco House of House, which is a division of Lewis-Goetz, which also has a branch nearer to you in Kent, WA.

I say just go with the copper and upgrade it later if you have to. Use vibration-tolerant installation techniques, for example bend tube in a full circle plus another 90 degrees rather than making a 90 degree bend directly. Mount the tube so it's supported but remains free to move a little. Hopefully that'll minimize the risk of work hardening small areas leading to eventual cracking.
family wagon is offline   Reply With Quote
Old 03-02-2017, 04:54 PM   #8
Bus Crazy
 
somewhereinusa's Avatar
 
Join Date: Nov 2010
Location: Andrews,Indiana
Posts: 2,007
Year: 1991
Coachwork: Bluebird
Chassis: AARE
Engine: 3116 Cat 250hp
Rated Cap: Just the two of us.
Quote:
The units come with copper lines that, as best I understand, are not the best choice for mobile installation.

I wonder if it is practical to replace those lines with an automotive type of refrigerant line?
Mini splits use much higher pressures, I tried using the AC lines I took out, they soon developed leaks. I checked into rubber lines that would handle the pressure they are made of unobtainium and unaffordium. What I ended up doing was slitting the insulation on the original copper tubing, very carefully routing the copper then putting the insulation back on with silicone and tie wraps.
I was able to route inside of dash and around windshield. You do need about a foot behind the unit for a nice sweeping bend out the back. I also recommend that you add a second drain. These things make a LOT of water.

I think you will find that the Double 12k units are all 240V. When I was looking 12K was the biggest you could get that are 120V. I installed one in front and one in rear.
somewhereinusa is offline   Reply With Quote
Old 03-02-2017, 05:02 PM   #9
Bus Nut
 
Join Date: Apr 2010
Location: Lebanon, IN
Posts: 250
Year: 1998
Chassis: TC 2000 bluebird
Engine: 5.9 cummins
Rated Cap: 66
Its not a big deal, or hard. Search for "barrier ac hose" on eBay. Hose, fittings, and the crimping tools are there.

Bill
miltruckman is offline   Reply With Quote
Old 03-02-2017, 05:15 PM   #10
Bus Crazy
 
somewhereinusa's Avatar
 
Join Date: Nov 2010
Location: Andrews,Indiana
Posts: 2,007
Year: 1991
Coachwork: Bluebird
Chassis: AARE
Engine: 3116 Cat 250hp
Rated Cap: Just the two of us.
Quote:
Originally Posted by miltruckman View Post
Its not a big deal, or hard. Search for "barrier ac hose" on eBay. Hose, fittings, and the crimping tools are there.

Bill
Thanks, when I was looking 2 years ago I couldn't find anything like that. Maybe just didn't know how to ask.
If I have trouble with the copper, I'll go with that.

Dick
somewhereinusa is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 08:04 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.