Textbook question - piercing valves - Page 2
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  1. #14
    Join Date
    Jul 2011
    Location
    central Alabama
    Posts
    23
    When necessary, I usually will only use piercing valves to recover refrigerant and install permanent access fittings.

  2. #15
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    Quote Originally Posted by Pion View Post
    When necessary, I usually will only use piercing valves to recover refrigerant and install permanent access fittings.
    That's why you use the top picture I posted. You braze it in (with it full of gas) and leave it there. Its a single step instead of using the bolt on one and then removing it and brazing in something else.
    Karst means cave. So, I search for caves.

  3. #16
    Join Date
    Dec 2005
    Location
    New Hampshire
    Posts
    35
    You are supposed to use the piercing fitting to pull out the refrigerant. Then you braze on a new process tube and use one of these http://www.sjdiscounttools.com/rob12458.html to attach your hose to the end of the process tube (its like a rubber compression fitting) and charge by weight. Then you pinch off the tube, remove the fitting and braze over the end of the process tube. This way everything is still hermetic when you are done. It's not that hard as long as you make sure the process tube is long enough to work with.

    Really though, just braze on a regular access fitting and be done with it.

  4. #17
    Join Date
    Aug 2008
    Location
    S. Grand Prairie
    Posts
    244
    Quote Originally Posted by karsthuntr View Post
    That's why you use the top picture I posted. You braze it in (with it full of gas) and leave it there. Its a single step instead of using the bolt on one and then removing it and brazing in something else.
    Same here...had a 20+ year old 10 ton Lennox with a defective high pressure switch a couple weeks ago, no core under the bad switch so I just brazed in the new service valve and wired in a new high pressure switch...took longer to go to the parts house than it did to do the work...
    Originally Posted by ladyfire3374:

    "I used to wake up excited about the challenges of the day. Now the anticipation level is somewhere between a root canal and a colonoscopy."

  5. #18
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    Quote Originally Posted by hceptj View Post
    Same here...had a 20+ year old 10 ton Lennox with a defective high pressure switch a couple weeks ago, no core under the bad switch so I just brazed in the new service valve and wired in a new high pressure switch...took longer to go to the parts house than it did to do the work...
    Lennox is where I found out about the brazed saddle valves. I had a pressure switch go bad on a lennox unit. Lennox sent me the saddle valve and a screw on pressure switch and said to leave the old one in since it was brazed in.
    Karst means cave. So, I search for caves.

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