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  1. #1
    Join Date
    Jun 2002
    Posts
    460
    I had a contractor out today to do a leak detection on my HVAC system. He identified the leak as being in the evaporator coil, and showed me how the pressure of the nitrogen he was using for detecting the leak would quickly leak out of the sytem with just the lineset and evaporator coil being pressurized.

    He was using 500 psi for this test. I thought normal pressures during operation were only 250 psi or so. Are coils actually rated for this much pressure?

  2. #2
    Join Date
    Feb 2003
    Location
    Huntsville,AL
    Posts
    4,125
    @ ICP we used that much pressure, but coils were inside HEAVY steel cage!

  3. #3
    Join Date
    Jul 2001
    Location
    Delaware
    Posts
    1,232

    500#

    I understand some manufacturers are using up to 600# on their coils now. I know 10 years ago, York was testing to 450#. Unless it is an R-410a system, I usually don't go over 300#.
    Work is for people who don't know how to fish.

  4. #4
    Join Date
    Jul 2002
    Location
    Zelienople, Pa
    Posts
    2,965
    Trane coils are burst tested w/ 2000psi...
    How tall are you Private???!!!!

  5. #5
    Join Date
    Apr 2004
    Posts
    7,680
    They are not rated for it but they can propbably handle it. Really he should be able to perform that test at 150psi, it just takes a little patiece as the exsisting leak will have a smaller differential pressure. Your guy is just one of the many who believe "If a little is good, alot must be better"

  6. #6
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,586
    500 is a bit too much for leak checking, but since it didn't blow apart, he got away with it.
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  7. #7
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    with the leak in the system it probably didnt hold pressure long enough to cause any problems
    he showed you the gages but did he show you the leak
    or at least hear it in the coil
    150 to 200 should have shown the leak to

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