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  1. #40
    Join Date
    May 2019
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    13
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    Thread Starter
    the question still unanswered: could NYLOG have messed that up? I use it for the first time

  2. #41
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    30,267
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    If used correctly, no.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

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  3. #42
    Join Date
    Dec 2009
    Location
    maroon lazyboy
    Posts
    2,320
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    Propane would be insane to use as a standard pressure test gas. You’re checking for leaks after all... are you gonna scout all areas for candles etc before pressure testing?

    Also propane has a higher moisture content vs R290 and CO2 has a higher moisture content vs dry nitrogen. Do you really want them in your system?

    The only problem I’ve ever had with nylog, is sometimes if too much is on the flare it will actually squeeze right out through the nut as you torque it down. (Small diameter only) I doubt this is the case for you, so no the nylog likely did not cause it.

  4. #43
    Join Date
    Aug 2018
    Location
    Piedmont Triad, NC
    Posts
    298
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    Not to mention unless you are pulling a vacuum before you pressure test, you still have air in the lines. And if you’re pulling a vacuum before you pressure test...well that’s like wiping before you poop, makes no sense.


    Sent from my iPhone using Tapatalk

  5. #44
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    20,789
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    Quote Originally Posted by sepuku View Post
    gases only burn if mixed / exposed to oxygen. you can test it with any gas as long as it does not react / attack the piping and the valves. Now, for those who say it is first year course: you just dont do what they tell you shouldn't but do you ever ask WHY? Same copper piping is used on propane water heaters (in fact in my store they will even sell me the same coil of copper if Iask for propane or HVAC), maybe except the valves (however inside it is pretty the same thing). As long as you evac the gas again from the piping and do not let it to the compressor I really see no point (except burning hazard). So unless you can point me to some other problem I see no issues testing the piping+wall unit with propane
    I'm pretty sure you could test it with compressed air / Co2 etc, whatever is at hand. I dont say you should always use propane but just in case you have no nitrogen at hand, it would work - exceptionally - with propane or compressed air etc.
    WTF is this and if your really staying using LP for pressure testing is safe your Freeking Nuts!

  6. #45
    Join Date
    May 2004
    Posts
    13,434
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