Testing a condenser
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  1. #1
    Join Date
    May 2004
    Location
    Malden Mass
    Posts
    261

    Testing a condenser

    Hello to all,
    I have a five ton Goodman R-22 condenser I pulled out and replaced with a new one last year for a customer.
    Problem: I took this unit out, stored it, but I didn't write down what was wrong with it. I did closed down the refrigerant shut off's. I don't know if it has a huge leak or a bad compressor.
    I wanted to run it to see what is wrong with it.
    I am thinking of connecting a copper loop (few feet long) between the suction and discharge lines, fill it first with nitrogen, check for leaks.
    If I find no leaks, I can run a temporary line voltage and see if the compressor will kick on.
    What do you guys thinks of my methodology?

  2. #2
    Join Date
    Jul 2012
    Location
    San Francisco Bay area
    Posts
    88
    Sounds good to me

  3. #3
    Join Date
    Jul 2007
    Location
    Virginia
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    5,307
    Quote Originally Posted by jdere View Post
    I don't know if it has a huge leak or a bad compressor.
    I would OHM out the windings of the compressor first to see if they are even within limits, before I went to any more trouble.
    Instead of learning the tricks of the trade, learn the trade.

  4. #4
    Join Date
    May 2004
    Location
    Malden Mass
    Posts
    261
    that's a good idea rundawg. I have various size used compressors and I am thinking of getting the condenser working and maybe selling it to a relative on a budget.

  5. #5
    Join Date
    May 2000
    Location
    Urbandale IA. USA
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    4,881
    Quote Originally Posted by jdere View Post
    that's a good idea rundawg. I have various size used compressors and I am thinking of getting the condenser working and maybe selling it to a relative on a budget.
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  6. #6
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,234
    Sounds good

  7. #7
    Join Date
    Jul 2004
    Location
    Massachusetts
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    6,829
    I think if you just run a wad of copper tubing out between the high and low sides you won't have to wonder about the compressor very long! Absent a metering device you'll just be shoving liquid right back into the suction side of the compressor. BANG. So much for that compressor.
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  8. #8
    Join Date
    Dec 2007
    Location
    north suburbs of Chicago
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    513
    Can't it just be started for a sec with the valves shut down? It's really no different than what you are doing when you close the discharge valve to pump down a system.

  9. #9
    Join Date
    Dec 2007
    Posts
    4,661
    can't you pressure test it without the copper, just use your manifold and hoses.
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  10. #10
    Join Date
    Nov 2011
    Location
    Michigan
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    53
    Just using your guages sounds like a good idea.

  11. #11
    Join Date
    Jul 2012
    Location
    North west Arkansas
    Posts
    86
    If the valves are closed, aren't the fittings isolated off, along with the open lines?

  12. #12
    Join Date
    Dec 2007
    Location
    north suburbs of Chicago
    Posts
    513
    Quote Originally Posted by texasgentleman2 View Post
    If the valves are closed, aren't the fittings isolated off, along with the open lines?
    Yeah. I forgot he wanted to pressure test it. I thought he had pumped down the system and was wondering if the compressor worked.

  13. #13
    Join Date
    Jul 2005
    Location
    Boston/Cape Cod
    Posts
    66
    I learned a long time ago to try to never work for friends or relative's
    southshorejohn

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