Page 1 of 4 1234 LastLast
Results 1 to 13 of 41

Hybrid View

  1. #1
    Join Date
    Feb 2004
    Posts
    15
    Post Likes
    I have read that you can pressure test a system with CO2, but have always been taught to only use dry nitrogen. Does anyone know of a reason why CO2 cannot be used?

  2. #2
    Join Date
    Mar 2001
    Location
    Halifax, PA
    Posts
    187
    Post Likes
    DO NOT use...i repeat DO NOT use co2 to pressurize any refrigeration system. The reason for this is becouse co2 has a high moisture content, which will be very very bad for your system if you add co2 to it. That is why dry nitrogen is used. You will be having moisute problems in the least for the next 100 years......Eric
    If you cant find the time to do it right the first time, then you wont find the time the second time around....

  3. #3
    Join Date
    Jul 2005
    Location
    Tulsa
    Posts
    15,603
    Post Likes
    Quote Originally Posted by bowman View Post
    DO NOT use...i repeat DO NOT use co2 to pressurize any refrigeration system. The reason for this is becouse co2 has a high moisture content, which will be very very bad for your system if you add co2 to it. That is why dry nitrogen is used. You will be having moisute problems in the least for the next 100 years......Eric
    old thread and full on BS .. the lowest grade of CO2 from Airgas is 99.9%+ pure
    what trace bit of water introduced by using CO2 gas will make next to zero difference
    one has to carry a bulky medium size nitrogen tank to equal a small CO2 tank for number of jobs

    nitrogen is filled by pressure vs CO2 is filled by weight and is mostly liquid when full

    http://airgassgcatalog.com/catalog/P...Pure_Gases.pdf
    The Election History Engine
    Search a database of counting... Reddit posts from two top political subreddits starting from Nov 2, 2016.
    http://adestefa.com/HE/

  4. #4
    Join Date
    Dec 2014
    Location
    In my truck, driving
    Posts
    1,315
    Post Likes
    Quote Originally Posted by cy View Post
    old thread and full on BS .. the lowest grade of CO2 from Airgas is 99.9%+ pure
    what trace bit of water introduced by using CO2 gas will make next to zero difference
    one has to carry a bulky medium size nitrogen tank to equal a small CO2 tank for number of jobs

    nitrogen is filled by pressure vs CO2 is filled by weight and is mostly liquid when full

    http://airgassgcatalog.com/catalog/P...Pure_Gases.pdf
    They lie.
    Or bootleg the proper measures.
    I find a lot of water in CO2, enough times to kill me if is did not treat it as contaminated.
    Jermichael Decorean Finley,
    I was squazzed... NPR interview.

  5. #5
    Senior Tech Guest
    You read wrong...or someone wrote wrong...no co2 for pressure testing period.

  6. #6
    Join Date
    Oct 2001
    Location
    Waterford Michigan
    Posts
    2,684
    Post Likes
    We use it all the time no problems.

  7. #7
    Senior Tech Guest
    Originally posted by johnl45
    We use it all the time no problems.
    You mean no problems yet, puts moisture in system, guaranteed.

  8. #8
    Join Date
    Aug 2014
    Location
    new york
    Posts
    140
    Post Likes
    Quote Originally Posted by Senior Tech View Post
    You mean no problems yet, puts moisture in system, guaranteed.
    everyone has different opinions & experience with co2,I have used it for the past 8yrz I do a deep vacuum after, which solves the moister problem my boss used it for 30yrs with no issue

    Sent from my SM-G9208 using Tapatalk

  9. #9
    Join Date
    Oct 2001
    Location
    Waterford Michigan
    Posts
    2,684
    Post Likes
    Originally posted by senior tech
    Originally posted by johnl45
    We use it all the time no problems.
    You mean no problems yet, puts moisture in system, guaranteed.
    No I mean no problems ever on systems that we have service for years!

  10. #10
    Join Date
    Feb 2002
    Location
    Yuma, Arizona
    Posts
    943
    Post Likes
    Dry nitrogen is the best and preferred item to put into a system other the refrigerant.
    Now, I did work once with an elder statesman tech that said CO-2 could be used in a pinch. But you do need to take added care. Problems can (and more often do) show up.

    As for absolute NO's in this trade, it keeps changing all the time. Note the thread on mixing some of the gasses.

    But the best to use is a dry product.

    Yuma,
    What is snow? Is it that white stuff in a freezer?

  11. #11
    Join Date
    Feb 2004
    Location
    Midwest
    Posts
    9,939
    Post Likes
    I've only done it once but it was on an a/c system, not a refrigeration system. I was trying to open a clogged cap tube, and purged it with dry nitrogen afterwards. That was 20 years ago, and I haven't had the inclination to do it since.

    Conventional wisdom is that, as the others said, the moisture content's too high, but also keep in mind that the pressures are anywhere up to 2,000 psi on a hot day!!! Which brings to mind some problems with what you're going to use to get the CO2 into the system.

    Just blowing out condensers with a refrigerant hose (with the fitting cut off one end), I've had the hose blow a big chewing gum bubble in the middle and pop

    Couldn't hear much for a few minutes.

    Then I got "smart" (NOT!) and flared a piece of 1/4" copper, and it froze to my forearm while blowing out a condenser







  12. #12
    bryan l Guest
    Here is a link to a three page discousion on this topic http://hvac-talk.com/vbb/showthread.php?threadid=35599

    If you scroll down page one and read the third from last on that page there will be a link. The link will show you what is in CO2. The whole topic is a good read.

  13. #13
    Join Date
    Sep 2001
    Location
    East Stroudsburg, PA
    Posts
    13,185
    Post Likes
    How about pure Oxygen? I hear that's always an exciting leak test...

Page 1 of 4 1234 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
  •  

Related Forums

Plumbing Talks | Contractor MagazineThe place where Electrical professionals meet.