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Old 05-30-2011, 11:57 AM   #29
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Here's the key information from his first post:

"I bought a new rotary compressor that had a bit more capacity (13k vice 11k BTUs) but pulled less current than the old compressor. I also bought a new fan motor. I also decided to make the unit a heat pump instead of just an a/c. So I bought a reversing valve and new bi-directional filter/drier. Since these old units have capillary tubes instead of TXVs (thermal expansion valves), the refrigerant can flow either direction. "

He completely re-built it with more power, less current draw, and also made it into a heat pump!

I am still astounded.
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Old 05-30-2011, 07:23 PM   #30
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Very fine work, and thread! Bookmarked. I may never run into one these again. Could have had one for the asking last year, but no trailer and place to store, plus the parts chase dilemma . . . well, I believe I could find a place for it what with all this information.

Plus, a cool custom shroud would sure be a great look on any vintage of aluminum trailer. I like to think that this level of re-building can be extended to the other parts as needed.

Thanks, jmpratt!

.
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Old 05-31-2011, 11:08 AM   #31
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Jason,

Looking at the pictures, it does not look like the newer style compressor is all that much taller than the old one, if any?

Was it the connections that created the extra height?
The new compressor and tubing is about 6" taller than the old one. If you use a reciprocating compressor vice a rotary, you won't have to modify the cover.
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Old 05-31-2011, 11:33 AM   #32
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I've seen on the new ac/heat systems they seem to have the same type as yours but in a hoz. mount compressor. Any thoughts?
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Old 06-01-2011, 12:14 PM   #33
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I've seen on the new ac/heat systems they seem to have the same type as yours but in a hoz. mount compressor. Any thoughts?
Rotary compressors are made in both horizontal and vertical orientations. I used the one I did because it was available and cheap. A horizontal one will work as well, assuming it would fit.
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Old 06-01-2011, 01:45 PM   #34
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I was thinking if you could use a hoz model thus it might take away the need to changed the cover and still look original?
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Old 06-02-2011, 08:44 AM   #35
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I was thinking if you could use a hoz model thus it might take away the need to changed the cover and still look original?
Yes, but you'd have to make sure it fits.
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Old 04-24-2012, 11:53 PM   #36
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Thank you too Jason! Now could you drop by my place and do mine? <G>
I have an original Armstrong too, and it still works, kinda. I wouldn't get much out of it in Phoenix, but in Flagstaff it's more than adequate. But would LOVE a rebuild/refurbish job. Just too old and not savvy enough to do it. Oh well. Will keep this handy just in case.
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Old 04-25-2012, 07:10 AM   #37
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You must have some refrigeration experience to do all this, good job on the rebuild. I put a new Dometic on my trailer and still have the old Coleman that needs a fan motor and lots of TLC. A fan motor for mine was $150. I am sure it need the three capacitors replaced as well. I may try to get used parts and fix mine up.

Perry
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Old 04-25-2012, 10:28 AM   #38
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My refer experience is just from my tinkering. I'm an engineer, so these things make sense to me. BTW, the unit made it through the whole winter just fine! Toasty warm!
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Old 04-25-2012, 06:56 PM   #39
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I thought I smelled another engineer.

Perry
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Old 04-26-2012, 09:11 AM   #40
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Since you have gone this far, you could take the parts and make a split system and get rid of the roof box alltogether. There many folks on here that would like such a system the preserves the line of their older trailers. I expect the majority of the stuff could go under a couch or bed. Personally, I don't mind the roof top AC.

Perry
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Old 04-27-2012, 05:23 PM   #41
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Since you have gone this far, you could take the parts and make a split system and get rid of the roof box alltogether. There many folks on here that would like such a system the preserves the line of their older trailers. I expect the majority of the stuff could go under a couch or bed. Personally, I don't mind the roof top AC.

Perry
I have thought about doing that, too. More because I would like to be able to service the unit without having to climb on top. If this one dies and I get a lot of free time, maybe I'll try that.
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Old 05-15-2012, 11:03 PM   #42
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jmpratt

My compliments to you on the engineering improvements you have made to an Armstrong AC/HP. I have bookmarked this thread. I have an original unit on my 66 TW and will add this to my list of planned improvements. I plan to use my 66 for another 20 years and then pass it on to another traveller.

Dan
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