Subject: re: gmc: (gmc) Conversion of ac to 134A




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AIR CONDITIONERS

Date: Sun, 05 Apr 1998 13:18:36 -0400

From: Marcus McGee

Subject: RE:GMC: (GMC) Conversion of AC to 134A
My original Transmode is having a problem with thw AC Compressor and it may need to be replaced. Has any one done the R12 to 134A conversion and what was involved? Any suggestions?
Thanks

Marcus

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Date: Sun, 5 Apr 1998 13:30:58 -0500

From: "Gilbert R. Bethel"

Subject: Re: GMC: RE:(GMC) Conversion of AC to 134A
I have seen it done but you will get less cooling with 134a. It was recommended to me that I not use 134a on a vehicle that the air conditioner is marginal at best (i.e. a large van with single unit). I would keep it R12 if at all possible to ensure that the front ac kept the coach cool in the hot summer time. I guess you could run the Onan and the roof units but that would be hard on fuel economy.
If you decide to go with the 134a you will have to replace the expansion valve/orifice tube, drier and all of the o-rings plus clean out as much of the mineral based oil out to the system as possible. I would go to a reputable automotive air conditioner specialty shop to have it done. I would stay away from places like Pep Boys and the like as they do not specialize in change over. It will be expensive either way you go. If you think you can live with less efficiency from the unit then you may want to consider the changeover, otherwise bite the bullet and pay the high price for the R12. I don't know where you live but R12 is not very expensive in Mexico. It is illegal to bring cans of it back into the USA. I don't know about having a unit serviced in Mexico and then bringing the vehicle back to the USA. One would have to check on that.

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Date: Sun, 12 Jul 1998 22:53:59 -0400 (EDT)

From: "Thomas G. Warner"

Subject: Re: GMC: A/C belt part numbers ??
Assuming you have a 455:
Dayco 15620

Gates 7619

GM (7/16" X62") 9433776

NAPA 25-15733
At 11:54 AM 7/12/98 -0500, you wrote:

>I lost the air conditioner belt this morning on the way home from work.

>Would someone have the part numbers for this belt?

>

>Russ Bethel

>rbethel#stic.net
Date: Wed, 12 Aug 1998 21:41:26 -0700

From: "Skid"

Subject: GMC: Coach a/c performance
I've been following the "maiden trip from hell" thread since it's inception, and I have to admit that it's dimming my enthusiasm for the coach a bit. I made the mistake of letting my wife read over my shoulder, and now she says "let's get an ad in right away!"
All of you sharing your stories (including Bob, who started the whole shebang!) are to be commended for providing us with a lot of nervous laughter...
Regarding the coach a/c capacity questions, we've had several big coaches (a 35'er and a 38'), and both could be very comfortably cooled with just the front (roof) a/c running while on the road. They both had the Dometic (Penguin) units, if that matters to anybody. Our '76 Eleganza II has had it's one roof unit replaced with a 13.5K BTU Mach III Coleman unit that seems to do a good job also, although we've only been in heat up to about 100 degrees (with fairly low humidity). You folks in the heartland that have both high temps and high humidity may have a different story to tell...but with only 26' to cool, I'd be surprised if more than one a/c was needed, even with all of the windows!
My a/c experts here in the Seattle area (yes, we do use it around here 3 or 4 times per year!) tell me that the roof units to lose their charge over time, as do most a/c systems, it seems. They recharge them, but I didn't ask the price, as I've never had to have it done.

My $.02 - maybe only worth $.01?!

Bill Marx

E-mail: billmarx#pobox.com

'76 Eleganza II - for sale (really...), as it's just too small for us

to full-time in...

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Date: Thu, 13 Aug 1998 11:59:05 -0400

From: "Bartz, Paul"

Subject: RE: GMC: Coach a/c performance
Bill, et al:
I agree that one rooftop a/c unit should be sufficient to cool the interior of the coach.
Several years ago, while on a trip into the Houston area during July, with temps in the upper 90's and same with humidity, had no problem keeping cool with our rooftop a/c unit (original).
Anyone experiencing problems otherwise, recommend you have the output of your a/c unit checked out.
Paul Bartz

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Date: Sun, 16 Aug 1998 19:55:52 -0700

From: LARRY DTIMOTHY

Subject: GMC: Rooftop Air conditioner
My Rooftop A/C compressor was kicking out after 3-4 seconds. While looking it over for what I don't know, one of the leads to one of the three capacitors broke. We found the A/C to work perfectly without that wire attached. The capacitor was replaced and the A/C works fine whether the wire is attached or not. Now my question is what the wire is supposed to do. I know this is not much information to work with, but I don't know how to identify which capacitor does what, let alone which wire is which. Just in case You haven't guessed by now, the extent of my knowlege of Air Conditioning is that it's supposed to blow cold air.

Thanks for any wisdom, speculation, or whatever You might offer here

Tim Timothy

Date: Sun, 16 Aug 1998 21:28:21 EDT

From:

Subject: Re: GMC: Rooftop Air conditioner
Tim

There are 3 capacitors you say. Ok I have not even got close to looking at mine but I am going to take a leap at this one. I worked on ACs 30 years ago so I may be a little rusty here.
Cap 1 is a start cap for the compressor, If this one is bad compressor will shake and shimmy when trying to start. It will do this for a few seconds then kick out on thermal overload---you will hear a click and compressor will shut down.
Cap 2 is a run cap for the compressor, if this one is bad the compressor will fire and try to run. It will sound like it is changing speeds the pitch of the sound will go up and down. On a cool day it may be able to run. Once head pressure builds on a hot day it won't be able to. Again out on thermal overload.
Cap 3 is a run cap for the fan motor. Again I have not looked but it should be the smallest of the 3. You might get things to work with a lead off this one. The problem is that the fan motor will not be operating at its design speed. This will cause head pressure to rise------ok on a cool day not on a hot. Everything will have to work harder.
A word of warning here If you do not know your way around these things be careful-----they can hurt you. Before touching a cap put a screwdriver across the two connections to discharge it. These things will hold a charge for a long time. Touch both connectors and you will be picking yourself up of the ground. At our ages you could do worse. Just short it out before you

play with it.
Best I can do with out grabbing the Bible.
Take Care

Arch

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Date: Sun, 16 Aug 1998 21:01:20 -0700

From: LARRY DTIMOTHY

Subject: Re: GMC: Rooftop Air conditioner
Per the paperwork I have available, the start capacitor is the round cased one of the Three. It starts normally(I think), NO shaking or shimmying like it is having trouble getting underway. Can't hear "click" - posssibly due to noise of compressor/fan motor

> Cap 2 is a run cap for the compressor, if this one is bad the >compressor will fire and try to run. It will sound like it is changing >speeds the pitch of the sound will go up and down. On a cool day it may >be able to run. Once head pressure builds on a hot day it wont be able >to. Again out

on thermal overload.
The best I can tell from the paperwork and what I understand that You're

saying, this is our culprit. It is the largest of the three.

(30uf) The wire in question goes from here to what appears to be a relay.
Thanks Arch,

And I enjoy your writings. I see no "rambling" as You say.

Tim

------------------------------
Date: Sun, 16 Aug 1998 22:48:54 EDT

From:

Subject: Re: GMC: Rooftop Air conditioner
In a message dated 98-08-16 22:00:51 EDT, you write:
<<

The best I can tell from the paperwork and what I understand that You're

saying, this is our culprit. It is the largest of the three.

(30uf) The wire in question goes from here to what appears to be a relay.

>>

Tim
It should be the biggest. 30 micro f about right. The relay is the start run relay. It starts the compressor on the start cap and then switches it to the run cap. The relay could also be bad but from my experience the cap is more likely to fail. Low voltage at campgrounds causes that. Good luck. If I can be of anymore help holler and I will get out the Bible and see if I know what I am talking about.
Take Care

Arch

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Date: Sun, 16 Aug 1998 22:08:27 -0700

From: LARRY DTIMOTHY

Subject: Re: GMC: Rooftop Air conditioner/Unnecessary Wire????
Thanks Arch,

I now know the capacitor was at least part, maybe all of the original problem. It has been replaced and the A/C works fine WITH or WITHOUT the wire mentioned. I was trying to understand the purpose of the apparently unnecessary wire, which, when attached will not let the A/C function with the faulty capacitor installed.

Tim

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Date: Sun, 16 Aug 1998 21:25:46 -0700

From: "mr.c"

Subject: Re: GMC: Rooftop Air conditioner
I don't know for sure based on what you said, but the capacitors are usually starting capacitors for the motors and are disconnected when the compressor comes up to speed. It is an aid to getting them going, and they can start by themselves but it makes them easier to start. I hope that is what the capacitor did that you were talking about.

Al Chernoff

Date: Mon, 17 Aug 1998 07:56:02 +0100

From: "Donald W. Miller"

Subject: Re: GMC: Rooftop Air conditioner/Unnecessary Wire????
My guess is, though the compressor motor runs without the capacitor, it probably draws more current and the compressor windings run hotter. I would suggest you make certain it is properly wired.
I worked one summer for Westinghouse as an intern in their industrial A/C design lab. The test cells were always well ventilated because when a compressor using R22 fails it can produce Phosgene, a highly poisonous gas. While I was there, we had compressors fail and blow out the seals around the electrical connections. There is also a flash fire as the oil comes out of the system under pressure and burns violently.
Those guys had enough respect for the potential danger they made a lasting impression on me so 45 years later I still prefer R22 compressors mounted outside the house over those in bedroom windows.
On the other hand, I have never heard of it being a problem outside the lab because the thermal switch keeps it from occurring.
I have several A/C service oriented books which do not mention it so I do

not know if this is well known among people who service A/C units or just to

those who design them.
Next time you hear an R22 compressor thermal switch click, you can count among your blessings the fact that it worked.
Don

Date: Mon, 17 Aug 1998 12:02:06 -0700

From: dlowry#silcom.com (Dave Lowry)

Subject: GMC: Roof A/C
Arch (or anyone else who might know);
The recent post re: capacitors reminded me of another abnormality I have not yet dealt with. Whenever we start the roof a/c, the fan comes on immediately but the compressor doesn't kick in for 60 to 90 seconds. Once working, it cools well and has never failed, but I'm worried that one day it will. We're about to leave on a coast-to-coast-to-coast trip (7,000 mi. or so), and will certainly need the a/c to work.
Is it likely to fail without further warning? How can I prevent failure, or fix it when it fails?
I can't get onto the roof to fix it myself, but I'd sure like to have an idea what was wrong before I had someone else get up there an play with it at my expense.
I travel with all the manuals (thanks to Cinnabar) and many useful snips from the posts on GMCnet, but I haven't found any mauals for the old a/c.

Any ideas what's going on?
TIA, Dave

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Date: Mon, 17 Aug 1998 16:00:51 -0400

From: "Bartz, Paul"

Subject: RE: GMC: Roof A/C
If I'm not mistaken, the roof top A/C manual points out that there is a delayed start for the compressor. I'm not at home now and don't have my manual available to me to tell you the reason.
Paul Bartz

From: Chuck Blanford [mailto:Chuck.Blanford#LPCorp.com]

Sent: Monday, August 17, 1998 1:48 PM

Subject: Re: GMC: Roof A/C
I am also interested in the answer to this post. My compressor doesn't kick in for several minutes, but seems to function well and stay on line once it does.

Chuck

-----------------------------
Date: Mon, 17 Aug 1998 16:01:46 -0400

From: Patrick Flowers


Subject: Re: GMC: Roof A/C
Dave,
Has this unit always behaved this way as long as you've owned it or did it just start doing this recently. IIRC, the roof a/c on my father's old HRC trailer also had a delayed start on the compressor. This was a safety feature to prevent compressor damage if the power went out and came back on quickly. It allowed refrigerant pressures to equalize before the compressor restarted.
Patrick Flowers

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Date: Mon, 17 Aug 1998 14:06:36 -0700

From: "Heinz Wittenbecher"
  1   2   3

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