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Old 05-10-2005, 02:07 PM   #11
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Steve, have you considered isolating the air conditioners side intake vents from the rear to prevent recirculating hot air back through the unit? It might improve efficiency. But what do I know, my bus is a/c-free (always run off batteries).

Chad
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Old 05-10-2005, 02:46 PM   #12
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That is what I was trying to say. The Intake and Exhaust do NOT mix, each are seperatly vented, and insulated inbetween the two.

On my installation there is two louvered vents. One for exhaust and one for intake. On the rear of my ac unit a fan blows out hot air. The entire area behind where this fan sits, a foam vent is constructed from the rear of the ac unit to the exhaust vent. When the fan is running all of the air is blown directly out the vent, not allowed to recirculate back in the sides.

I will try to find a picture to post when I get home, although when I did it, it was hard to take pictures because of the small space above the unit and the roof.
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Old 05-10-2005, 03:04 PM   #13
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Quote:
Originally Posted by Steve
That is what I was trying to say. The Intake and Exhaust do NOT mix, each are seperatly vented, and insulated inbetween the two.
Sorry, didn't read close enough. The pictures don't really show how the vents are separated. Sounds like it should work pretty good how you have it setup.
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Old 05-10-2005, 03:15 PM   #14
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Hi Steve,

That's a great idea for the window air; not only does it look good it's also economical (cost of A/C unit as compared to a roof unit).

I only have one question for you: How do you take care of condensation? what I mean is; when you camp in a humid place, the unit drips from reaching dew point temp. Did you run a drain through the window drain or directly outside?

If you don't have a drain, you might consider it before you ruin the wood.

Thanks,

Roasting8

BTW, I'm also going to try your idea, I really think its great.
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Old 05-10-2005, 03:33 PM   #15
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The model of AC unit I got said you are not supposed to drill a hole for a drain, you may want to look at that before you buy one. This one has a pan around the bottom of it and water that forms on the cool side gets collected and evaporated and blown out by the hot side. The only time I have had trouble with water is when I have been running the AC and then drive the bus right away. Then the water in the pan splashes out. Other than that, when the bus is sitting there isn't any problem with water.
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Old 05-10-2005, 03:42 PM   #16
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my favorite took for cutting straight lines in the side of the bus (if you're still planning to cut holes in yoru bus) is a metal abrasive blade for the standard circular saw. I find this is much easier to cut a straight line with this setup than using a sawz-all.

Wear safety glasses and ear protection. It's amazing how loud it gets!
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Old 05-10-2005, 05:39 PM   #17
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Hi Steve,

Thanks for the information about the A/C units. I was still used to the old type that had a drain hole in it. I also lived in Mississippi, that no matter how much tray you had, it still leaked water.

I might try to put another tray under the A/C unit and avoid the grief.

Thanks again for the info.

Roasting8
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Old 05-11-2005, 12:13 AM   #18
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This is simillar to what I am planning on doing. Many units have a drain plug at the rear of the unit. You can attach a tube to that or drill a hole in the bottom of the unit.
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Old 05-11-2005, 09:47 AM   #19
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Same here. It wouldn't be too hard to run a hose under the bus or out the side. Probably under though so you wouldnt get runs on the side. I love this idea. Soon as I get my electrical figured out, its on.
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Old 05-14-2005, 12:10 PM   #20
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re: ac unit

There was a thread a month or so I started regarding under bus ac units. The plan was to install and vent into the bus. However after doing some figuring (never ending it seems) I have opted to not use under compartments to maintain clearance. So last week I installed my AC unit inside the bus in a similar fashion to steve's. However I went throught the side of the bus. There is about half an inch of the unit visible sticking out the side that vents. There was no concern on this model of condesation after having run it in the house for a few days strait.

I hadn't planned on installing the AC unit until I reached Halifax in the summer because I don't own one. There isn't much of a need for one here in Calgary Alberta. I gets warm but not hot enough for long enough. But when in BC a couple weeks ago I came across a unit in the dump while I happend to be there that somone had tossed. So I plugged it in and it worked great. woohoo!

I also was given an older model 2kw mcoulough (sp) generator. So now I have constructed two small platforms on the back of the bus. On which one is the new home of the generator. I built a box for it that has an intake vent and an exhaust vent. It's insulated with 2 inch blue sheet foam (also donated). The box is lifted off to start the generator. Very high tech. But it makes a huge difference in volume.

So the AC unit is locate in the middle of the bus in the kitchen area beside the propane furnace. It is resting on a 2 by 4 frame with another fresh water tank located underneith (sp) it. This was rescued from a van conversion at a local parts yard. Now I'm up to about 35 gallons of fresh water. I don't have a shower and don't plan on one until I redo the system next year so That should be ample water.

The AC unit has it's power cord run to the main power center. In theroy it could be run off the 1200 watt inverter but I haven't done this. It takes 950 watts to power it. I built an insulated box around the bottom and top. The sides are open and vent into interior compartments that it shares with the furnace so it is able to gather fresh air to push through the coils. So far so good. I will post photo's when able. -Richard
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