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R-134a conversion / Vacuum 200 1988

posted by  Fiver on  Fri Apr 15 06:59 CST 2005
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Going to convert my 240 to R-134a, the compressor is shot so I will be replacing pretty much everything including the compressor.

After I've replaced the compressor (with the correct oil), expansion valve, evaporator, and drier, I understand that I need to vacuum the system.

Any reason not to use this to do the job?

http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=92475

After I've vacummed it out for an hour, it is just a matter of running the AC at max and putting in just over 2 lbs of 134-a, correct?

Thanks for any advice.








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    R-134a conversion / Vacuum 200 1988

    posted by  Sumerduckman on  Fri Apr 15 07:16 CST 2005
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    last visit: Tue Aug 21 11:31 CST 2007
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    I started with one like that years ago, and got frustrated with it because it just would not pull enough of a deep vacuum to do a good job. Especially when the system has been apart and full of air, not just an evac and re-fill.
    I bit down real hard, saved my lunch money, and bought the little Robinair two stage 1/8 hp pump. It has paid for itself many times over.
    Running the air powered pump, you also have to make sure your air compressor can deliver 4+ cfm at 90psi for over an hour.
    --
    Gary Gilliam Sumerduck VA, '94 940 na Regina 150k, '86 240 180k








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      R-134a conversion / Vacuum 200 1988

      posted by  Fiver on  Fri Apr 15 07:34 CST 2005
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      Yeah, my compressor can handle that.

      As much as I'd love to have a little Robinair follow me home, I don't know how much use I'd actually get from it.

      Maybye I will just try to rent a vacuum pump from Autozone or something.

      Thanks.







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        R-134a conversion / Vacuum 200 1988

        posted by  Sumerduckman on  Fri Apr 15 10:17 CST 2005
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        last visit: Tue Aug 21 11:31 CST 2007
        [RELATED]

        One of the things the little compressor powered pumps are good for is to be able to pull enough vacuum to check and see if there are any leaks after doing service work. After you change out the ac compressor and other parts,pump it down to 29 in-Hg ( checked with a good set of manifold gauges) and see if it holds for a few hours. If it does, great. You could then take it to a shop and have them deep vacuum and charge, or just deep vacuum if you would want to charge it yourself.
        If it doesn't hold ,charge a can of UV dyed 134.Then get a cheap black light and glasses, find the leak and fix.
        --
        Gary Gilliam Sumerduck VA, '94 940 na Regina 150k, '86 240 180k







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