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Old 07-28-2006, 05:02 PM   #1
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1973 31' Excella 500
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Dometic RM 75 dead - can't be repaired

I am sorry to say that the RM 75 unit that I have in my 1973 31' Excella had the dreaded ammonia smell when I tried it shortly after buying it. I suspected it was shot and negotiated accordingly.

I think I exhausted all resources trying to get the cooling unit repaired. I did find a guy in Soddy Daisy (gotta love the name), TN about three miles from where I picked up the trailer to bring it to Florida. The fellow said that he could fix it but it is the most expensive - about$750 not including shipping and time to remove the unit, etc.

I called Palamino and the have a replacement unit that is slightly smaller 1 1/2 inches shorter and 1/2 in narrower for $800 plus shipping. This unit comes with a warranty and should not be hard to install.

I'll have to salvage the wood panels on the front of the old box as they match the rest of the trailer.

Can any one use the old one?

Joe
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Old 07-30-2006, 04:03 PM   #2
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Hi, Joe,

That's a kind offer. While I don't need any parts, I think that the most important thing you can do for an ammonia cycle fridge is to leave it running. The RM 75 in my'75 Argosy has been operating since I bought it in Nov. 1992. In all that time, the only replacement part I've done was one heating element after a thunderstorm.

Lamar
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Old 08-21-2006, 02:02 AM   #3
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1975 28' Argosy 28
Homewood , Alabama
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Fridge parts

I might be interested in some fridge parts! I just took mine out last night and have it over on its head to burp the unit. I may need the burner unit with the baffle. I have a RM76 unit in my '75 Argosy.( Wondering if parts are compatible?) I really don't know if parts will solve my problem yet but nice to know they can be had if need be! Thanks!
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Old 08-21-2006, 10:09 PM   #4
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Hello,

Nice offer. While I don't need the specific parts you have... I would be sure and post a notice in classifieds to let folks know you might be willing to part your old one out.... trim pieces, etc. could be real finds for some people! Might get an offer from someone who is willing to part with a little $ for some of the pieces.

Mrs. NorCal Bambi (traveling in S Tardis)
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Old 08-22-2006, 05:25 PM   #5
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Fridge Parts II

Hey Y'all,
I have gone thru all the steps for burping the fridge and it STILL won't attempt to get cold. I guess I won't be needing parts. Need a whole new/used fridge. I do have a small Kenmore apt sz, but is really too small if you happen to be living in the trailer! I do know someone with a fridge like mine that may part with it(it is not installed in a trailer). I just don't have the $$ for a new one! Any Ideas?
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Old 08-22-2006, 07:17 PM   #6
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Dometic 75 dead

Joseph,

If you don't mind having a total electric, Home Depot has a nice one for $139.00.

Good Luck,

Lee Pace
72 Tradewind
Greenville, Tx
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Old 08-22-2006, 07:27 PM   #7
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Thanks Lee, I may do something like that for the time being. I really would like to have the 2-way or even a 3-way. Cost prohibitive right now tho. What color options and what model would this be and does it fit tight in the old fridge space? Thanks again for your suggestion!
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Old 08-23-2006, 05:01 AM   #8
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RVnDixie,

I was going to part with my old refrigerator but I found a new lead on someone who might be able to repair it. I definately don't want to stray from the original type of box - gas/electric. I just talked to a fellow who was at a vintage Airstream rally in the northeast. He indicated that they would kill to have the original box in their units. It is a status thing and apparently increases the value of these vintage trailers. PM me and I'll try to forward the places that I tried. they may work for you.

What make and model refrigerator do you have?

Joe
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Old 08-23-2006, 06:33 AM   #9
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Quote:
Originally Posted by defelice
I just talked to a fellow who was at a vintage Airstream rally in the northeast. He indicated that they would kill to have the original box in their units.
I'm assuming you are referring to the recent Region One rally held in Rochester, NH. Stu Snyder held a vintage refrigeration seminar/demo during vintage day on Saturday during the rally. He did indicate that a rig is worth more if it has the original working refrigerator in it. Apparently there is a huge market for these refrigerators (and parts) so keep that in mind if you plan on parting with yours. I would suggest the classifieds or eBay to get maximum exposure. Stu also buys old refrigerators.

We had a problem with our refrigerator too -- it lit just fine but it didn't cool. During the Region rally, Stu worked on our refrigerator for two hours and was able to get it to work. The problem ended up being a simple one to solve -- a good burner cleaning including the orifice in the burner. Apparently, when lit, the flame is supposed to look like a blue Hershey's kiss candy. Our "kiss" was missing the pointed top but after Stu finished cleaning things up, it is now working beautifully. He needed a piece of ultrafine copper wire to clean the orifice. After stripping a few wires, we were able to find one fine enough to fit in the orifice.

For more refrigerator info, here is a link to Stu's website:

http://www.snydersrvrefrigeration.com/
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Old 08-23-2006, 10:08 AM   #10
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Don't Try This At Home!!

Quote:
Originally Posted by yukionna
I'm assuming you are referring to the recent Region One rally held in Rochester, NH. Stu Snyder held a vintage refrigeration seminar/demo during vintage day on Saturday during the rally. He did indicate that a rig is worth more if it has the original working refrigerator in it. Apparently there is a huge market for these refrigerators (and parts) so keep that in mind if you plan on parting with yours. I would suggest the classifieds or eBay to get maximum exposure. Stu also buys old refrigerators.

We had a problem with our refrigerator too -- it lit just fine but it didn't cool. During the Region rally, Stu worked on our refrigerator for two hours and was able to get it to work. The problem ended up being a simple one to solve -- a good burner cleaning including the orifice in the burner. Apparently, when lit, the flame is supposed to look like a blue Hershey's kiss candy. Our "kiss" was missing the pointed top but after Stu finished cleaning things up, it is now working beautifully. He needed a piece of ultrafine copper wire to clean the orifice. After stripping a few wires, we were able to find one fine enough to fit in the orifice.

For more refrigerator info, here is a link to Stu's website:

http://www.snydersrvrefrigeration.com/
I know Stu and we have been communicating for a while. He does good work. One word of caution: NEVER put anything into an LP orifice! The hole is precision drilled and even a little scratch will distort the flame and decrease the effeciency of the unit. Any orifice cleaning should ALWAYS be done chemically and NOT mechanically.

If the orifice can't be properly cleaned....REPLACE IT!!

(This is a public service message.....your results may vary)
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Old 08-23-2006, 11:27 AM   #11
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Dometic RM 75 dead

I didn't realize until yesterday that Vintage Trailer Supply now has refrigerators, Dometic and Norcold. The prices are cheaper than the RV places. You might want to check it out.

Good luck,

Lee Pace
72 Tradewind
Greenville, Tx.
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Old 08-23-2006, 04:29 PM   #12
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If you want the cheapest prices on new refrigerators, call Palamino. Their number is on another thread or I can get it and post later.

Joe
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Old 08-23-2006, 06:20 PM   #13
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Quote:
Originally Posted by lewster
One word of caution: NEVER put anything into an LP orifice! The hole is precision drilled and even a little scratch will distort the flame and decrease the effeciency of the unit. Any orifice cleaning should ALWAYS be done chemically and NOT mechanically.
Hmmmm...well Stu used an ultrafine piece of copper wire to clean our orifice. With regards to your comment about that action decreasing the efficiency of the unit...how can I gauge whether or not the efficiency of our refrigerator was affected by this action?
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Old 08-24-2006, 10:49 AM   #14
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Quote:
Originally Posted by yukionna
Hmmmm...well Stu used an ultrafine piece of copper wire to clean our orifice. With regards to your comment about that action decreasing the efficiency of the unit...how can I gauge whether or not the efficiency of our refrigerator was affected by this action?
The question is whether the copper (soft wire) did any scratching to the brass (also soft) orifice. Probably not in this case, as I assume that the single piece of wire was smaller than the orifice itself, thus causing no distortion to the opening.

The bottom line......if your refer is getting cold and staying cold, you don't have to worry much about the orifice.OTOH, if you have any other cooling problems noticed while running on propane ONLY, you might want to get a new orifice of the proper size. The number is usually stamped right on the orifice and is also listed in your appliance manual.
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