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  1. #1
    Join Date
    Apr 2012
    Location
    Charlotte Area NC
    Posts
    844

    Why flush the line?

    Follow up diagnostic after 2 compressors have been installed, system building ridiculously high head pressure (like almost 650 psig) with a very low suction pressure (read 0)...
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    The txv screen was so clogged I ended up cutting the line set adapter out to try and clean it and just ended up replacing the whole txv and adapter all together. Also a new filter drier was installed after I cleared the lines with rx-11 and nitrogen sweep
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    Cut in multiple spots to show clog to boss



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  2. #2
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,327
    sounds like they added 5 more lbs to get suction up ... bam 650

  3. #3
    Join Date
    Feb 2006
    Location
    Tn.
    Posts
    1,344
    Wouldnt be the first time thats been done.

  4. #4
    Join Date
    Aug 2013
    Location
    OKLAHOMA
    Posts
    143
    How could they miss that. lol

  5. #5
    Join Date
    Oct 2013
    Location
    Lynnwood wa
    Posts
    22
    Looks like someone didn't braze with nitrogen lol

  6. #6
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,596
    Quote Originally Posted by okie1997 View Post
    How could they miss that. lol
    Because low suction pressure ALWAYS means more gas.


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    There are people who live and learn, while others are just livin'. Don't be the latter.

  7. #7
    Join Date
    Jan 2004
    Location
    Northern California Central Valley
    Posts
    90
    I don't think brazing without N2 would cause that much build up, that looks like a major oil problem. N2 is always a great protocol but how many units have been burned in without driers or N2? And they ran for years.
    I wonder if this was a retro from R-22 to R-410A?

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  8. #8
    Join Date
    Oct 2013
    Location
    Lynnwood wa
    Posts
    22
    Quote Originally Posted by rselby View Post
    I don't think brazing without N2 would cause that much build up, that looks like a major oil problem. N2 is always a great protocol but how many units have been burned in without driers or N2? And they ran for years.
    I wonder if this was a retro from R-22 to R-410A?

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    Brazing without nitrogen can cause is if you have a idiot that has multiple crappy joints. I had a installer that worked at the company I work for use a stick a joint. He caused multiple TxV and filter dryer failures due to him not brazing with nitrogen and not being able to braze. But your right many units have worked for many years without doing it. It also could be from the line not being flushed from a burn out compressor or r22 from the old system. Who knows. Either way no matter how it happened, the guy who installed it didn't do his job correctly

  9. #9
    Join Date
    Jan 2004
    Location
    Northern California Central Valley
    Posts
    90
    That is a fact, he didn't do his job. A stick per joint, that's going to be expensive in more ways than one. I sure hope he didn't have any leaks? ;-)

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  10. #10
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,596
    It looks like carbonized oil to me, personally. Did this system have a burnout on the first 2 compressors?


    ---------------------------------
    There are people who live and learn, while others are just livin'. Don't be the latter.

  11. #11
    Join Date
    Oct 2013
    Location
    Mobile, Alabama, United States
    Posts
    288
    How many tanks of oxy/acet did he go through per job?

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  12. #12
    Join Date
    Feb 2013
    Location
    Cary NC
    Posts
    683
    Compressor burn outs, no nitro, stick per joint...... Looks like Grandpa's hashish pipe.

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  13. #13
    Join Date
    Nov 2007
    Location
    California
    Posts
    15
    Quote Originally Posted by rselby View Post
    I don't think brazing without N2 would cause that much build up, that looks like a major oil problem. N2 is always a great protocol but how many units have been burned in without driers or N2? And they ran for years.
    I wonder if this was a retro from R-22 to R-410A?

    Sent from my SCH-I535 using Tapatalk now Free
    I agree, this was definitely caused by an A/C unit with a very bad smoking problem.
    Its parents were smokers and this one picked up the habit at an early age.
    Even after multiple heart transplants, it still never learned.

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