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Old 06-29-2011, 05:37 PM   #15
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Thanks everybody. I tore the thing apart and have capacitors and relays, etc. out. What I have is a Coleman 13,500. I cannot read the model number on the data sheet as it is too faded; the only portion of it I can get is the 6799 part. I have a "Potential Relay, Essex part# 128226-1945PC which, while I have it out I might as well replace. I have another Aerovax M capacitor part# 88-108MFD 250VAC, which I can also replace. Now, there are two more capacitors, bundled with the Aerovax one that are so rusted that I am unable to get any numbers off of them. Can anybody help me out with these? Any suggestions on where to go to get all of them at once at a fair price?
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Old 06-29-2011, 05:53 PM   #16
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I had the same problem with mine shutting down. My air conditioner was made in 1975. I found out there are oil ports on my Coleman air. They are only on the old air conditioners. They are by the electric motor. I put oil in them by using a hypodermic plunger. My air conditioner started to run and did not shut down. That was one year ago I added the oil. I recently added more oil in the ports. I am only familiar with the 1970's Coleman.

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Old 06-29-2011, 05:59 PM   #17
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Originally Posted by Lothlorian View Post
I had the same problem with mine shutting down. My air conditioner was made in 1975. I found out there are oil ports on my Coleman air. They are only on the old air conditioners. They are by the electric motor. I put oil in them by using a hypodermic plunger. My air conditioner started to run and did not shut down. That was one year ago I added the oil. I recently added more oil in the ports. I am only familiar with the 1970's Coleman.

Brian
Replacement blower motors usually have oil ports, at least the ones I've bought have. The original equipment ones don't seem to anymore.
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Old 06-29-2011, 08:01 PM   #18
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Quote:
Originally Posted by RichWoodward View Post
Thanks everybody. I tore the thing apart and have capacitors and relays, etc. out. What I have is a Coleman 13,500. I cannot read the model number on the data sheet as it is too faded; the only portion of it I can get is the 6799 part. I have a "Potential Relay, Essex part# 128226-1945PC which, while I have it out I might as well replace. I have another Aerovax M capacitor part# 88-108MFD 250VAC, which I can also replace. Now, there are two more capacitors, bundled with the Aerovax one that are so rusted that I am unable to get any numbers off of them. Can anybody help me out with these? Any suggestions on where to go to get all of them at once at a fair price?
http://www.amazon.com/128226-1945PC/dp/B00401B65S

http://www.amazon.com/Gemline-11045-.../dp/B0026GLEX8

If you have an account with Grainger or know someone who does you can probably get better prices and service from them than the dealers on Amazon. Here's the start cap: StartCapacitor, 88-108mfd, 220-250 VAC, Rnd - Capacitors - Motor Supplies - Motors : Grainger Industrial Supply

Despite the rust the oil-filled run capacitors are probably still OK unless they are bulging or leaking. One is for the compressor, one for the fan motor. Here's the Grainger link which if you click around will get you a list of sizes and ratings which might help you decide which one you have: Run Capacitor, 20 MFD, 370 VAC, Oval - Capacitors - Motor Supplies - Motors : Grainger Industrial Supply
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Old 06-29-2011, 08:35 PM   #19
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AWESOME! The relay I have already found. There is a Grainger in Greensboro I used to deal with. I have finally figured out that the other capacitors are also Aerovox. One is numbered Z23P3712N and the other Z26P3735M. I can find numbers similar to these on Aerovox's site but on the first one the "P" is replaced with an "S" while I cannot find quite the same number for the other. I suspect that there are minor variances in the capacitors; often times it doesn't matter that much but, in this case, I don't know. Can you help me out there?
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Old 06-29-2011, 08:36 PM   #20
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I recently had the same issue. I replaced the breaker and it still tripped the breaker. I have it plugged into a 30 amp dedicated circuit. I had the A/C checked locally and at Texas RV Oarts they could not get it to trip. Brought it home and bought a 30 amp extension cord and have not had it trip since
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Old 06-29-2011, 10:56 PM   #21
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you can check with these folks:
Out-of-Doors Mart
they're pretty close to you.
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Old 06-30-2011, 09:56 AM   #22
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Originally Posted by RichWoodward View Post
AWESOME! The relay I have already found. There is a Grainger in Greensboro I used to deal with. I have finally figured out that the other capacitors are also Aerovox. One is numbered Z23P3712N and the other Z26P3735M. I can find numbers similar to these on Aerovox's site but on the first one the "P" is replaced with an "S" while I cannot find quite the same number for the other. I suspect that there are minor variances in the capacitors; often times it doesn't matter that much but, in this case, I don't know. Can you help me out there?
It's just a difference in oil formulation (impregnate). The "P" version is obsolete.

If you dig through the Aerovox catalog (try here) you can find the part number decoding.
Z - product series
23/26 - case size
P/S - impregnate
37 - 370 volt
35/12 - capacitance. You have a 35 uF and a 12.5 uF capacitor.
M/N - N is a marker for odd values that don't quite match, so 12 becomes 12.5 for example

Any two 370 volt capacitors, 35 uF and 12.5 uF, from any supplier, should work fine. The Grainger part numbers are 2MEE1 and 2MEC4.
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Old 06-30-2011, 01:14 PM   #23
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Thanks, I certainly appreciate your taking the time to figure that out for me; I get overwhelmed with the details. That part numbering diagram was exactly what I was looking for, I suspected there was something like that but, last night, I was too tired to look. I have found the relay at Out-of-Doors Mart and (inadvertantly) bought the 88-108 capacitor on-line. Perhaps I will get the other two capacitors simply because they will be easy to replace while I have the whole thing apart.

Now, of course, I will probably learn that the problem was the compressor all along but at least I will eliminate everything else. If nothing else, I have learned a BUNCH about my air conditioner.
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Old 06-30-2011, 01:18 PM   #24
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One other question. I notice that there is a "hard start" option for these AC Units. Judging by the pictures, they appear to consist of a relay and capacitor; are these replacements for the original relay and capacitors or something in addition to them? I asked the parts desk at Out-of-Doors Mart but they couldn't help me.
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Old 06-30-2011, 01:29 PM   #25
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The hard start kits just increase the size of the start capacitor. In some cases the kits include a new relay, which can be either the "potential" style relay or just a time delay.

They tend to shorten the life of the compressor and shouldn't be used except when necessary.
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Old 07-18-2011, 09:29 PM   #26
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OK, after waiting for a replacement capacitor for the original that was broken when I received it, plus a week out of town, I finally replaced the capacitor and relay for the compressor. Still doesn't work. I turn it on and it loads up, then pops the breaker. I switched to the unused side of the breaker and while it takes a couple of seconds longer to pop, it won't hold the load either. I suspect that I have a problem with the compressor.

At this point, I think I should just replace the unit; does anybody have any other suggestions? If I do replace it, and I know this is a common question but I cannot find a definative answer, what should I replace it with? Something that will use the original drain tube, healthy and relatively quiet? This is for a 1990, 29' Excella without a remote thermostat.

Thanks
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Old 07-19-2011, 11:18 AM   #27
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The low-profile Dometic "penguin" in the 15,000 btu size is the usual recommendation although to get one that doesn't use a remote thermostat will require a special order. They are loud.

You can also replace the compressor if you can find a refrigeration contractor who's willing to do the work. The parts cost should be around $300 and it can be done without removing the A/C from the trailer. There's a thread with photos here somewhere from someone who did this themselves although it's really not something you should attempt unless you have a background in refrigeration.
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Old 07-19-2011, 06:50 PM   #28
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Thanks. I have looked through the past few years for threads on "AC Replacement" but I end up going around in circles. It sounds as if the Carrier was the preferred choice but is no longer available. Out-of-Doors Mart recommended the DuoTherm Penguin 13,500, model # 640315 at a semi-reasonable rate; they also offer the drain tube hookup and the ceiling unit. When I go to the Dometic web site I find lots of different AC/Heat Pump units but, unfortunately, the 640315 isn't listed. I suspect that it has been superceded but I'm not certain what with. I kind of like the heat strip that was in mine, nice for chilly mornings without firing up the furnace and was wondering about the heat pump version of the Penguin but I cannot find any information on the drain tube sump (or whatever they use). Has anybody tried this unit or am I just wasting my money?
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