Page 2 of 3 FirstFirst 123 LastLast
Results 14 to 26 of 34
  1. #14
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,665
    Quote Originally Posted by hvacvegas View Post
    There's other ways for non-condensables to get into a system other than a leak.
    one way is maintenance tech not bleading the 410 from there hoses with the low loss fittings and putting a 60 inch hose full of liquid 410a in a r22 unit
    We really need change now

  2. #15
    Join Date
    Jul 2005
    Posts
    5,571
    You can run the test from the LL service port, no problem, even with the LL service valve wide open. Look for a SC reading on the static system with fan running of over 2. You'll know when the liquid in the coil is at ambient temp when your temperature reading has stabilized. Any reading less than 2 SC could possibly be only instrument error, so don't scream noncondensables if your SC reading is above 0 but less than 2. FWIW, if noncondensables are bad enough to cause noticable performance issues, then you'd really be looking for a static SC reading much higher than 2. Convert your saturated temps to pressures, and do the math yourself. A 5 or 10 psi noncondensable partial pressure won't typically cause noticable symptoms. It would be best to get them out anyway, even at low amounts, but don't expect that in and of itself to eliminate the problems that you're trying to diagnose. HTH.

    I've run this test many times. It works.

  3. #16
    Join Date
    Apr 2004
    Location
    MN
    Posts
    1,803
    Thanks medic, that's exactly what I was looking for. I figured there had to be a way.

    catman-speaking from experience? Based on the specific details you listed...
    A Veteran is a person, who at some point in their life, wrote a blank check payable to the United States of America for payment up to and including their life.
    Gene Castagnetti-Director of the National Memorial Cemetery of the Pacific in Hawaii

  4. #17
    Join Date
    Nov 2006
    Location
    Athens, Ohio
    Posts
    1,809
    Quote Originally Posted by Joseph'bidness View Post
    P.s. I keep saying hemoglobin in refrigerant lines would take iron to transport oxygen. Imagine a surfactant lined purge system for non condensable gases?
    Isn't hemoglobin blood? Why would that be in an HVAC system?

  5. #18
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,048
    Hey medic - this reminds me of the system you were helping me on this summer.

    It was a txv indoors with a longish lineset all horizontal that would flash in liquid line close to indoor unit.

    I was sure I had a liquid restriction but it ended up being noncondensibles and the txv had no liquid seal.

    With the entire charge pumped into condensor it was about 25 psi partial or 10deg over ambiehnt.

    I'm not sure how much static subcooling it would have shown with the long lines and all. Interesting.

  6. #19
    Join Date
    Jul 2005
    Posts
    5,571
    Quote Originally Posted by doc havoc View Post
    Thanks medic, that's exactly what I was looking for. I figured there had to be a way.

    catman-speaking from experience? Based on the specific details you listed...
    Just a note, you'll want to verify a liquid seal at the LL service valve when using this method. Easiest way to do that is run it in cooling mode for a few minutes before testing.

  7. #20
    Join Date
    Jan 2002
    Location
    Ft.Worth,Tx
    Posts
    4,584
    It was called VACUUM back in my day, if you have P/T not measure accurate ,recover refrigerant, vacuum, check with micrometer and re-charge, NO more non-condensables
    "Everyday above ground, is a good day".
    "But everyday that you have made a difference in someones life, may insure you stay above ground a little longer".<aircooled>

  8. #21
    Join Date
    Apr 2004
    Location
    MN
    Posts
    1,803
    Quote Originally Posted by aircooled53 View Post
    It was called VACUUM back in my day, if you have P/T not measure accurate ,recover refrigerant, vacuum, check with micrometer and re-charge, NO more non-condensables
    I don't disagree with you, however, there are other things that can make P/T not measure accurate. So, detection and evidence of noncondensables prior to going through the recovery, evacuation and recharge process is somewhat desireable.
    A Veteran is a person, who at some point in their life, wrote a blank check payable to the United States of America for payment up to and including their life.
    Gene Castagnetti-Director of the National Memorial Cemetery of the Pacific in Hawaii

  9. #22
    Join Date
    Feb 2013
    Location
    New Jersey before and after Texas
    Posts
    65

    Pay at the pump

    Quote Originally Posted by doc havoc View Post
    It's not always practical to change the oil. (hermetic compressors with no drain plugs)
    http://www.bestbuyheatingandaircondi...tegory_Code=C3

  10. #23
    Join Date
    Feb 2013
    Location
    New Jersey before and after Texas
    Posts
    65
    Quote Originally Posted by doc havoc View Post
    I don't disagree with you, however, there are other things that can make P/T not measure accurate. So, detection and evidence of noncondensables prior to going through the recovery, evacuation and recharge process is somewhat desireable.
    I don't change oil much... The dealer I have been doing work for is far more interested in just replacing stuff anyhow...

  11. #24
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,048
    How much oil do you really get out with a pump like that anyway. I'm assuming you cut the suction line and try to snake a tube in their? Never tried it but seems impossible on a scroll.

  12. #25
    Join Date
    Feb 2013
    Location
    New Jersey before and after Texas
    Posts
    65

    Oil

    Quote Originally Posted by SBKold View Post
    How much oil do you really get out with a pump like that anyway. I'm assuming you cut the suction line and try to snake a tube in their? Never tried it but seems impossible on a scroll.
    Not enough to fill the frying pan that's for sure... I haven't used either. Only changed oil once, and I dumped it out...

  13. #26
    Join Date
    Feb 2013
    Location
    New Jersey before and after Texas
    Posts
    65
    There is no such thing as extra virgin olive oil either... Interesting fact picked up from Italy.. Anyways, I would think it can pump four to seven ounces per stroke. I would feed the tube through the "skinny" line...

Page 2 of 3 FirstFirst 123 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event