Over The Road Air Conditioning

[Jim Blackwood]

I see, so basically there's one guy on here who might know and he ain't sayin'. S'OK, I can figure it out.

Jim

[chessie4905]

So, then you don't have any manuals? I can give you the info on the Trane 3 cylinder used on GMC's, but it may be too different from yours. BTW, they pump it in. A specific procedure.

[Jim Blackwood]

I plan to buy the manuals on CD when I run down to Louisville to get a windshield but that will probably be sometime next summer. In the meantime I've got a not-very-good downloaded manual that doesn't match the bus and has missing parts and is on a computer I don't use very often to work from. I can look at it, it's in an out of the way place.

It's not the most urgent thing though, I'd rather get the condenser door fixed first. And somewhere along the line I need to get a tank I can evacuate the freon into. I have a refrigerator compressor pump that should be able to do that. Might be slow but I have time. For a tank I suppose I could use a 100lb propane tank that I have handy.

Sometime in the next couple years I plan to do some research and buy a couple of compressors to run off the shore line (may end up buying household condenser units  depending on the price breaks and just remove the pumps) at which point I'll need to evacuate the system to work on the plumbing. Part of that plan includes solenoid valves to isolate the evaporators. In the end I expect to be able to run the three smaller evaporators (2 bin units and the dash air) off the new compressors, selecting the ones I want to run based on heat load and power available.

So, If I haven't added oil I can do it then. In the meantime I just want to keep the system operational and run it occasionally.

Jim 

[Jim Blackwood]

I looked up a few things.
System charge with r134 is 36lbs.
A full charge should show freon in the lower sight glass after running 30 minutes.
High pressure safety switch is 300psi.
Pump suction can be used to suck oil into the crankcase without purging any freon.
Oil should be checked after running for 30 minutes and with the engine off.
Level should be full at the engine side sight glass and empty at the curb side.
Do not overfill.

Jim

[buswarrior]

Excellent report!

Takes a lot of time to work on the coach AC

Definitely not yer car!

Happy coaching!
Buswarrior

[Jim Blackwood]

I found that the condenser door can be muscled shut by lifting and shoving in stages, no doubt that is the accepted practice. Next time around I will look for some way to use a pry-bar on the bottom rear corner.

Some updated info.
Dash TXV is 1 ton, not 1-1/2 so total is 14 ton.
Evaporator motors are 2hp each (~65A) and appear to be set up to run in series or parallel. (for high and low speed)

Jim