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Old 09-13-2018, 11:17 PM   #51
Bus Geek
 
Join Date: May 2009
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Year: 1991
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Chassis: International S3800
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dash air blows cold with engine running... how about key on but engine stopped...

im guessing there is a compressor under the alternator.. I think thats where Bracketry systems locates it ..


Steve - whather there were 1 or 2 compressors usually depended on how the original Van chassis was ordered,, if it was ordered with a Chassis A/C prep kit option themn the Van was equipped only with Dash A/C switches and an evaporator.. wiring was provided for a compressor as well as the normal engine brackets for A/C using a ford FS-10 compressor.. most times no compressor was included..


a 3rd party like carrier, Trans/AIR, ACC, MCC (many ithers) would install a 'Tie-IN' system in which a high capacity compressor, rear evaporator, rear switches, skirt mount condensor and screw-On O-ring fittings, etc.. the dash evaporator was tied in..


if the Van chassis was ordered with Full A/C then it came from the factory with a fully working dash A/C system such would be like you received if ordering a cargo van or Chassis designed for a Box truck..



the aftermarket A/C company would locate their own compressor.. usually with brackets from red-dot or bracketry systems..



hard to see from your pics... following the suction line out of the evaporator is usually how to get to the compressor..

ive seen sepoarate compressors in the larger shuttle busses... the ones with 6 or 7 windows. as they need the capacity
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Old 09-14-2018, 09:15 AM   #52
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With the no-idling rules becoming more popular, I wonder if they did an electric compressor so that it could run for short times from the batteries without having to keep the bus running?
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Old 09-14-2018, 09:47 AM   #53
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The compressor should be on the lower passenger side of the engine. You might not see it from the bottom. You go through the wheel well to replace it so look through there.

I'd be extremely surprised if it has a 12v powered compressor. Once again, the amount of power required to run an ac compressor is 2-3 kw. They have gotten more efficient over the years but not efficient enough to run off of a typical vehicle battery with the vehicle off.
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Old 09-14-2018, 12:49 PM   #54
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Quote:
Originally Posted by Booyah45828 View Post

I'd be extremely surprised if it has a 12v powered compressor. Once again, the amount of power required to run an ac compressor is 2-3 kw. They have gotten more efficient over the years but not efficient enough to run off of a typical vehicle battery with the vehicle off.
I would be inclined to agree.

You would need quite a large battery to support the roughly 200 amps (or more) draw for any period of time at all.

Even with the engine running, you would need a VERY substantial alternator to support it. Remember, automotive alternators are not rated for continuous duty. If you pull 200 amps from your 200 amp alternator for too long and you will let the magic smoke out.

I would love to be wrong here. I would be ecstatic to find a 12volt compressor that will support enough a/c capacity to cool effectively and be practical to run from the bus charging system. If you you find such a unicorn please share the details.
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Old 09-14-2018, 01:28 PM   #55
Bus Geek
 
Join Date: May 2009
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Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
Jegs offers Hoptrod A/C compressors that are electric.. at 3700 BTU they pull 31 amps.. the compressors are electric on hybrid cars.. those use the high voltage batteries and are DC inverter type compressors...



150 amps is about right for what it would take to run the average Dash air..
-Christopher
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