Mini Split A/C's and Heat Pumps

[luvrbus]

David, i have 2 condensers in the spare tire compartment of my Eagle and one in the rear i had trouble with the 1 by the engine till i built a box to keep the heat away from it i have 2 small evaporators in the bed room i large 1 in the living room and 1 large over the ref in the kitchen the evaporators come in all different shapes and size i love the adjustable fan speeds but not the price of the units maybe Nick can save you some money i had to get mine from a marine dealer in Texas about 6 grand for 3 complete units

[Sojourner]

Caution important thing to unknowledgeable ....Split System is Always contain a pair of lines between unit.....that is NOT called self-contain unit....Like it read "Split System". Otherwise self-contain unit have ducting system which is NOT Split-System.

About either (non RV) residential & commercial unit can be design into larger or heavy vehicle type if you add isolators or insulators between loose tubing inside of compressor unit with tie-wrap and stronger grade mounting bolts & washers for compressor. You notice I quoted "heavy vehicle" not light vehicle that jars & very bumpy while traveling over pot holes with small diameter tires.

You can find Split System unit take-out for free if it came from school system been thorough damaging storm. Most of them are fine but being removed to rebuild school building with all new systems. Some of them are 110v/single/phase unit. I have many of them for free to install in a old (1926) 8 fireplace brick home and MCI-8.

Whatever you do, always keep high pressure smaller line hot from compressor until reach expansion valve or restricted line/hole via wrapping with good insulator...especially ex-long line of 10 ft or more. Need to maintain highest pressure as possible at evaporator point to get the maximum cooling differential effect. Another word hot high pressure will result lower pressure if cooled at the other end.

FWIW

Sojourn for Christ, Jerry

[jjrbus]

Hi David,

Just from, been there done that, you need 3 mini splits in a 40 ft bus. Thoose 12,000 btu units that are 115v seem to be a little undersized in

their ratings...??..??  I have 2 customers that can tell you that now. Daniel Odio, and Dave Schmidtt.. Both ended up having us install a 3rd mini split
[/font]
            When putting in AC units we have to take into consideration the bus. Is it insulated? How much and what kind. Windows area, insulated or single pane. I have a 35 ft bus with the Saudi roof, spray foam insulation and large thermopane windows. There is also 1 1/2 in closed cell foam in the floor. The bus is painted ultra white, I chose this color, not becuse I like white but becuse it reflects heat!! A little common sense in a conversion goes a long way.
I have 2 13.5 K ducted roof top units, they are too big!! I have a 30 amp service so never run them both at the same time but if I did I could go into the frozen produce transport business.
When I said I would put 3 units in, i was thinking of 2 small units like maybe 6,000 BTU      a
nd a 12,000 in the front.

[Tony LEE]

In another method specified by one manufacturer, the compressor/condenser units are slightly overcharged and once the lines are hooked up, one specified fitting is cracked and the isolating valve opened for a set time to purge the air from the lines and then the fitting is tightened.  Crude but seems to work OK.