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  1. #1
    Join Date
    Jun 2010
    Location
    Jacksonville, Florida
    Posts
    54

    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
    4,482
    Sounds practical.

  3. #3
    Join Date
    Jan 2010
    Posts
    6,829
    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
    Jun 2010
    Location
    Jacksonville, Florida
    Posts
    54
    Yes, back seated valve.

  5. #5
    Join Date
    Oct 2002
    Posts
    1,394
    If Lennox, these are one shot valves and will not close.

  6. #6
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,765
    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.

  7. #7
    Join Date
    Jun 2010
    Location
    Jacksonville, Florida
    Posts
    54
    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
    Jan 2010
    Posts
    6,829
    For what it's worth I personally would not use a pinch off tool on a thru type line. On a process tube or to remove a pressure switch is one thing. Pinching a line then re rounding it is h*ll on the tube wall. That's my

  9. #9
    Join Date
    Sep 2007
    Location
    NH
    Posts
    1,217
    Quote Originally Posted by VTP99 View Post
    For what it's worth I personally would not use a pinch off tool on a thru type line. On a process tube or to remove a pressure switch is one thing. Pinching a line then re rounding it is h*ll on the tube wall. That's my
    I agree.

  10. #10
    Join Date
    Oct 2002
    Posts
    1,394
    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.

  11. #11
    Join Date
    Oct 2007
    Location
    Hallandale Beach, FL.
    Posts
    437
    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.

  12. #12
    Join Date
    Oct 2002
    Posts
    1,394
    Same tool .does both

  13. #13
    Join Date
    Oct 2007
    Location
    Hallandale Beach, FL.
    Posts
    437
    Thanks, that will come in handy.
    I miss you mom and dad.

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