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  1. #1
    Join Date
    Sep 2007
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    Nitrogen testing

    I have had thus question for a while and never got around to ask anyone.

    On a system with a hard lockout TXV (I think that is what it is called), when putting nitrogen in a system to leak test through the liquid line, the low side stops at around 200 psi. Should I then open the suction side on the gauges to equalize the pressure so I have 400 psi on both sides? This would be for a 410a heat pump? Or an I going to hurt the TXV?
    Can someone please explain to me -
    Why is there never enough time to do it right the first time, but plenty of time to do it twice?


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  2. #2
    Join Date
    Aug 2002
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    Southold, NY
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    Raise the pressures equally. Avoid putting too much pressure on one side or the other.

    This also applies to valve plates, Scroll check valves everything.

  3. #3
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    Thread Starter
    Quote Originally Posted by pecmsg View Post
    Raise the pressures equally. Avoid putting too much pressure on one side or the other.

    This also applies to valve plates, Scroll check valves everything.
    OK. Thanks.
    Can someone please explain to me -
    Why is there never enough time to do it right the first time, but plenty of time to do it twice?


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  4. #4
    Join Date
    Jun 2018
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    Open both your gauges all the way and turn on the nitrogen tank.

  5. #5
    Join Date
    May 2018
    Location
    FLORIDA
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    i also open bot gauges all the way and let the nitrogen flow in slowly, but not going up to 400 PSI
    i stop at 250
    Visit our website at www.airconcomfortcooling.com

  6. #6
    Join Date
    Aug 2002
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    Quote Originally Posted by AIRCON8 View Post
    i also open bot gauges all the way and let the nitrogen flow in slowly, but not going up to 400 PSI
    i stop at 250
    R410A systems need much higher test pressure

    600%’s

  7. #7
    Join Date
    May 2018
    Location
    FLORIDA
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    nope i'm not go that high LOL
    250 is the limit period
    Visit our website at www.airconcomfortcooling.com

  8. #8
    Join Date
    Jan 2010
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    What if your leak doesn't show up till 300# ?

  9. #9
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    Aug 2002
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    Quote Originally Posted by AIRCON8 View Post
    nope i'm not go that high LOL
    250 is the limit period
    What’s the high pressure limit on that System?

    What’s the Test Pressure on that system?

  10. #10
    Join Date
    May 2018
    Location
    FLORIDA
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    i do residential up to 5 tons
    pressure switches txv coils and compressor valve
    no need to go to 600 psi
    not me
    Visit our website at www.airconcomfortcooling.com

  11. #11
    Join Date
    May 2018
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    Quote Originally Posted by pecmsg View Post
    What’s the high pressure limit on that System?

    What’s the Test Pressure on that system?
    don't know i was just answering to a guy here
    Visit our website at www.airconcomfortcooling.com

  12. #12
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    Mar 2016
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    Quote Originally Posted by AIRCON8 View Post
    i do residential up to 5 tons
    pressure switches txv coils and compressor valve
    no need to go to 600 psi
    not me
    Discharge at the compressor is going to be over 400 psi on a 410a unit.

    Just saying.


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  13. #13
    Join Date
    Jan 2004
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    PA
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    When its a heat pump. Put the nitrogen in through the vapor side. The TXV is only hard shut off in cooling mode. It will still let nitrogen flow from the vapor side to the liquid line.
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