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Old 08-27-2013, 05:56 PM   #15
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Have changed out car AC systems from R-12 to R134A.

It requires different lube oil, and a change out of the orifice to get the flow right. Compressor and hoses can also be an issue depending upon the system...we had to do it because the compressor died, and it was easier to go to R-134A at the same time.
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Old 08-27-2013, 06:01 PM   #16
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When changing compressors with new or rebuilt why can you not use new style refrigerant as they do this with cars all the time when changing on older cars with r22 and purging systems? My son has done many times.
Older cars used R-12, not R-22. Most car upgrade kits have the necessary parts (such as rmkrum mentioned) for using R-134a as a working fluid instead of R-12. I doubt such a kit is available for an old Armstrong.
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Old 08-27-2013, 06:43 PM   #17
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Car compressors are sold without oil.

Home/business compressors are shipped pre-filled with oil.

Different refrigerants require different oils.

Older cars had R-12 refrigerant. New cars have R-134a refrigerant. R-12 requires mineral-based oil; R-134a requires synthetic oil.

The different oils are incompatible. Here is a link to something I wrote which provides additional insight:

Adventures of a Curious Fellow: Tom’s A/C Wërks

Bottom line - home & automotive A/C compressors have different rules.

Aloha,
Tom
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Old 08-28-2013, 11:33 AM   #18
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Originally Posted by featherbedder View Post
When changing compressors with new or rebuilt why can you not use new style refrigerant as they do this with cars all the time when changing on older cars with r22 and purging systems? My son has done many times.
R-22's thermal properties are different than R-12 and R-134a. You would have to redesign the system and change out the capillary tubes and use a compatible compressor. It is likely that the BTU/h capacity of the resulting system would be lower, because R-134a generally provides less cooling than R-12, and R-12 provides less cooling than R-22.

Newer RV air conditioners use R-410a which operates at much higher pressures and requires thicker walled tubing. If you switched to that it would work great until you burst a tubing wall on a hot day.
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Old 08-28-2013, 12:21 PM   #19
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Legally R-22 can be produced until 2020 (see January 1, 2020 under "Phaseout Schedule"), but NEW systems were prohibited from using R-22 after 1 Jan 2010 and have to use reclaimed/recycled refrigerant. I'm sure that prohibition reduced the number of facilities producing R-22 and is part of driving up the price. I suspect part of it is also inventory manipulation by those who are still supplying it.
R-12 was phased out completely in 1996 (no new production as with R-22 as of 2020), and while prices and availability have fluctuated, you can still buy the stuff if you have an EPA license. They have it in stock at the local NAPA for $50 a pound. Recycled refrigerant, mainly from junk pre-1996 cars, has been more than enough to keep up with demand.

R-22 will probably have fewer problems with price and availability than R-12, because it isn't used in cars. Automotive air conditioning systems will all eventually leak, but that isn't true of the home air conditioning systems and appliances for which R-22 has been used.
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Old 08-28-2013, 02:00 PM   #20
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Try grainger.com for a new compressor.

Perry
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Old 08-29-2013, 06:38 AM   #21
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I still don't know how to find what compressor will fit/work in my ac. Do any of you know how to determine the correct compressor for my Armstrong 14? Many of you seem to be very knowledgeable in ac's.
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Old 08-29-2013, 10:07 AM   #22
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If you can find the original manufacture and part number for the compressor that is in it right now grainger might be able to match it up.

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Old 08-29-2013, 10:15 AM   #23
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I still don't know how to find what compressor will fit/work in my ac. Do any of you know how to determine the correct compressor for my Armstrong 14? Many of you seem to be very knowledgeable in ac's.
This excellent thread, stickied at the top of the same category our current thread lives in, has info about the specific replacement compressor and other parts the poster used to rebuild his Armstrong.
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