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  1. #1
    Join Date
    Jun 2010
    Location
    Jacksonville, Florida
    Posts
    50

    Bad liquid service valve

    Went out today to do a simple coil-pull-and -clean and low and behold a huge problem. Went to do a pump down and shut the liquid line service valve and guess what? It would not shut down. I took and pressed down on it to get the threads started but that did not work. Duhhhhhhhh......

    Had to explain to the customer that I now need to replace service valve as well as the coil clean. Lucky he understood and I grabbed the recover tank and recovery machine to reclaim the R22. Cut coil out and cleaned with my coil gun, man I love that thing.

    Reinstalled coil and added new heat pump dryer while at it. Cut service valve out and installed new one. Charged to proper superheat using my Amp-probe to take WB readings and plugged in the super heat reading to SMAN3 to dial it in.

    I am thinking the installer must have cooked the valve and when he opened the valve on start up , front seated to valve to much. What do you guys think?

    Sent from my iPad using Tapatalk HD
    Solutions Heating and Air, Inc. Jacksonville, Florida "Solutions for All Your HVAC Needs"

  2. #2
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,834
    Sounds practical.

  3. #3
    Join Date
    Jan 2010
    Posts
    6,209
    Quote Originally Posted by myott View Post
    Cut coil out and cleaned with my coil gun, man I love that thing.

    Do you always remove the coil to clean ?

    I am thinking the installer must have cooked the valve and when he opened the valve on start up , front seated to valve to much. What do you guys think?

    Sent from my iPad using Tapatalk HD
    Did you mean to say back seated the valve to much ?

  4. #4
    Join Date
    Oct 2002
    Posts
    1,276
    If Lennox, these are one shot valves and will not close.

  5. #5
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,726
    Quote Originally Posted by timjimbob View Post
    If Lennox, these are one shot valves and will not close.
    when they did use them it was only on the suction line, they have not been used in quite a few years though.

  6. #6
    Join Date
    Jun 2010
    Location
    Jacksonville, Florida
    Posts
    50
    Yes, back seated valve.

  7. #7
    Join Date
    Jun 2010
    Location
    Jacksonville, Florida
    Posts
    50
    Quote Originally Posted by timjimbob View Post
    If Lennox, these are one shot valves and will not close.
    It was a Carrier

  8. #8
    Join Date
    Oct 2002
    Posts
    1,276
    myott- get a pinchoff tool or two. You can stop the refrigerant in copper tube like it was a valve and open it later.

    Great for adding a LL filter without having to pump down system, or if your service valve is broke.

  9. #9
    Join Date
    Oct 2007
    Location
    Miami, FL.
    Posts
    427
    Quote Originally Posted by timjimbob View Post
    myott- get a pinchoff tool or two. You can stop the refrigerant in copper tube like it was a valve and open it later.

    Great for adding a LL filter without having to pump down system, or if your service valve is broke.
    Never thought of this. Do you open the tubing using a flaring block?
    I miss you mom and dad.

  10. #10
    Join Date
    Oct 2002
    Posts
    1,276
    Same tool .does both

  11. #11
    Join Date
    Oct 2007
    Location
    Miami, FL.
    Posts
    427
    Thanks, that will come in handy.
    I miss you mom and dad.

  12. #12
    Join Date
    Jul 2006
    Location
    Anytown USA
    Posts
    2,057
    **** happens and valves fail to hold all the time, no need to automatically blame the installer or a person.. That effing valve was probably made in China anyway.

  13. #13
    Valves aren't what they used to be. I heat sink the valves with extra rags...makes brazing a little tougher, but at least I don't cook any more cheap Chinese valves.

    I'd hate to be the guy using a Turbo Torch these day...you have to use them full open and you can't adjust the flame size. Makes for any easy overheat situation.

    I know few guys who can use a Turbo with out over heating line set and valves.

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