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Make: Travel Supreme
Model: Motor Home
Refrigerant Type: R134a
Country of Origin: United States
Tim or anybody have any specs on this? All I found while looking around on it was it has a R134a sticker but no info printed on it. Amount of refrigerant needed or anything. Was going to add some to it to see about bringing the temps down a little cooler. Big vehicle to cool so I know it probably not going to cool it down a lot. My boss just complains it doesn't seem to blow cold air like when I redid his Chevy truck or his Ford. Thanks to Tim and the guys for the help and parts on those vehicles. This will be first time doing anything on this vehicle since he bought it last year. Any idea on pressures to look for? I will have to hook my gauges up to it and see what it has currently, but probably not get a chance till this weekend. Forgot to add this is a 38 footer in length.
Edited: Mon June 04, 2012 at 6:16 PM by Toddc72
Pressures are always pretty much the same depending on if a vehicle is a CCOT or expansion device system. My data does not cover Motor Homes.
With mine, got bounced back and forth between Chevy and Pace Arrow for even a basic refrigerant and electrical circuit. Let alone any information about charging.
On mine the evaporator and its housing was custom made, no manufacturer or name on it, no one at Pace Arrow knew who made it. So took it apart, leak tested it, and cleaned it. Also a dual fan blower motor, never seen one like that before, so took that apart, cleaned it and checked the brushes. Blower control was with nichrome resistors on a board, that was easy enough.
Compressor was a York, least found information on that, uses an expansion valve with an evaporator capillary tube that was shot, couldn't even find one close to it anywhere, again no name nor manufacturer. So I designed one using diodes for a temperature sensor, knew I wanted to kick it off at 33*F and back on again at 39*F.
Climate control looked like GM, but never saw a climate control with all spade lugs on it rather than a multi-pin connector. Someone got in there and screwed it all up. Took it all apart, cleaned the switches and the vacuum switch and made a circuit diagram of it so it could be wired properly. Knew at Max, the recir door should be close, air out the defrost vents in defrost, out the floor vents in normal, out the dash vents in Vent. Found hornet nests everywhere, so added screens, was blocking the mode doors from operating properly. Found those in the range vent as well and behind the refrigerator, cleaned up all that and added screens, replaced all the top vents, weren't sealing properly.
With an R-12 system charged to 29 psi at 85*F, high side was showing at 220 psi. Been seven years ago, think it took around seven pounds.
Its only a 27 footer but gets darn hot if sitting in the hot sun on pavement. To keep my girls happy, when starting off, switch on the generator and use the overhead AC to cool it down for about ten minutes. Then after rolling for awhile, say its too cold. This uses a variable heater valve with a slow delay time, so have to play with that to add heat to keep them happy.
Never heard about your motorhome, name doesn't make much difference, what chassis is it on, and what kind of components does it use?
Need some more information on the unit. Motorhome companies change names & models on a whim.
Which end is the engine in?
Compressor make & model?
Where is the condensor located?
Where is the dryer located?
From there we can make some educated guesses about the system from past experiences.
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.
Pusher engine layout on chassis. Chassis is Spartan Mfg.
Compressor has: Tama Mfg. on it with a Model number of J-639
Condenser is located in front of left front tire
Evap core says: Evans on it with a part number of RV200532 and is located a little to the left of center line on the front of the firewall
Accu Dryer is located a little to the right of the center line on the firewall below the condenser
Evap and Dryer locations are located when staring at the front of the firewall looking towards the back direction
Hope this helps some?
Edited: Tue June 05, 2012 at 6:00 PM by Toddc72
Something like this?
A bit too much for me, I am getting old, with the compressor way at the rear powered by a Cummins diesel with line running clear to the front to the condenser, then to the evaporator, then clear back to the compressor with either a receiver or an accumulator stuck some place. Where are the service ports?
If it is low on refrigerant, looking at approximately 80 feet of line where anywhere can be a leak. That motorhome is sitting very low, can you even jack it up?
Then you say its for your boss, is this the guy you depend upon for a living? Are you experienced with MVAC? Call my wife the boss, she loves that since she was from Venezuela from a very male dominated society and was treated like a slave. She always wanted a motorhome, so we got one. Seen homes like that, I have a 30 by 15 foot level concrete slab on the side of my garage and a four ton 24" floor jack. That 27 footer has a gross vehicle weight of 12,000 pounds, I can handle that. Put douglas fir blocks under all six wheels so I could lift it to drop the AT that needed to be rebuilt. Sure couldn't handle this.
Is a King's Camper in Wausau, they have a huge shop with a gigantic lift for these big things, a bit too much for me to do the work myself.
We saw a 42 footer she like, king size bed at the rear, a laundry room with a washer and a dryer, side pull outs. Just said, we are lucky just to go out for weekend, a week at most, I can't handle that, not even enough space to park it. A man has got to know his limitations and these motorhome people charge 100-125 bucks per hour!
Are you sure you can handle this?
EPA had a paper on R-134a refrigerant loss per year kind of requesting, certainly not demanding that manufacturers do a little better job to reduce leaks.
Their paper stated an average annual loss of refrigerant of 10% for passenger vehicle and up to 50% for commercial vehicles! R-134a ports, whoever approved of them should be shot, a major cause of refrigerant loss. But done to please the manufacturers so they can use a quick coupler rather than take two extra seconds and screw one on.
In general, after checking over the entire system for any oil leaks, I mean this vehicle is already eleven years so refrigerant loss can be major. If no detectable oil leaks any where, just top it off by pressures. This can be done without knowing the capacity.
Just did that with my 88 Supra I had in storage for the last eight years, AC worked, never was charged before, checked it over for any refrigerant and oil leaks, found none. So added about 5 ounces of R-12 to top it off. Could never find 5/8's ounce leakage per year, but will keep an eye on it. Only 24 ounce system to start with so running at 80% can make a substantial difference in cooling. It did, blasting out ice cold air now.
But if I found oil leaks, would mean recovering finding the repairing the leak, a complete flush and adding the correct amount of oil. But I already know how much oil it should take.
Oil is the problem, and something you should know in advance. Could try calling:
66149 SR 19
Wakarusa, IN 46573
And perhaps somebody there knows. Didn't have that luck with Pace Arrow, but you could be lucky. Let us know how you make out.
I'm not going to be any help on the AC repair, but maybe the motorhome part. I don't know how much RV experience the owner has. It is pretty well known that the class C motorhomes - the ones that are GM/Ford van based - have a usable "dash" AC system, because they are good OEM systems. In class A's, whether gas or diesel, the dash AC is a joke, for many of the resasons already described (length of plumbing, oddball parts, inadequate and poorly located vents). The volume of interior space and glass makes the systems useless. I don't know if I ever used mine, and I was not alone. Running down the road in the summer, the generator was on and the roof AC's were used for cooling.
This is the AC/heater box in my 27 foot Pace Arrow, works very well, even on those zero degree days we get up here. But rarely gets above the 90's.
Box is 18" across to give you the idea of its size.
Who made this box and what heater core or evaporator is in there? Don't ask me. Won't worry about that until it breaks.
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