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  1. #79
    Join Date
    May 2014
    Location
    Bay Area California
    Posts
    26,554
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    Oh, here's the thread I lost. Looking for another thread. Just so I could make a point.

    Bottom line, you want to turn this into a test question for others?

    Post it on this thread:

    https://hvac-talk.com/vbb/showthread...Test-Questions


    Quote Originally Posted by BBeerme View Post
    Oh. I just got that. I was likely speed reading before.

    You pulled a funny. And yes, that is funny !!

    Maybe I'll use that as a test question for the guys I work with. Or new hires; yeah, that might be better.

    I had a thread on here with all sorts of bogus test questions, but I think it got lost when this site's server crashed. It was three pages of hilarious questions. Questions that only a senior tech would be able to see through. Wonder if that thread is still around?
    I do a triple evac with nitro to remove non condensables.

  2. #80
    Join Date
    Dec 2018
    Location
    SW-ARK
    Posts
    23
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    We bleed through while brazing, we raise pressures equally, and we test to near 200. If pressure doesn't hold we soap bubble and listen with an amprobe.

  3. #81
    Join Date
    May 2018
    Location
    FLORIDA
    Posts
    301
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    Quote Originally Posted by DuskEnough View Post
    We bleed through while brazing, we raise pressures equally, and we test to near 200. If pressure doesn't hold we soap bubble and listen with an amprobe.
    Thats what i do but we raise the pressure at 250 and use H10 PRO for eventual leak search LOL

    Great mind think a like
    Visit our website at www.airconcomfortcooling.com

  4. #82
    Join Date
    Jun 2019
    Posts
    49
    Post Likes
    agreed. You are just asking for problems if you start going higher......problems you do not want.

  5. #83
    Join Date
    Jun 2014
    Location
    Dover, DE
    Posts
    11,847
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    Quote Originally Posted by mtsaz100 View Post
    agreed. You are just asking for problems if you start going higher......problems you do not want.
    What problems?
    “I haven’t failed. I’ve just found 10,000 ways that won’t work.” - Thomas Edison

    “It’s not whether you get knocked down, it’s whether you get up.” - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

    Local 486 Instructor & Service Technician

  6. #84
    Join Date
    Jan 2010
    Posts
    19,279
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    Quote Originally Posted by rider77 View Post
    What problems?
    Running out of nitrogen sooner

  7. Likes DuskEnough liked this post.
  8. #85
    Join Date
    Jul 2019
    Location
    Oklahoma home its in the name
    Posts
    1,271
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    It seems to me that not testing to normal operating pressure would be asking for problems.

    Sent from my "smart" phone using Tapatalk

  9. #86
    Join Date
    Aug 2018
    Location
    Piedmont Triad, NC
    Posts
    786
    Post Likes
    So, we had an install class at bakers last week and I asked the guy what pressure to test at. His official slide said the stock standard “set nitrogen relief valve to 150” but he said just don’t exceed what the low side equipment plate says. Makes sense to me.


    Sent from my iPhone using Tapatalk

  10. #87
    Join Date
    Mar 2016
    Location
    NY
    Posts
    99
    Post Likes
    Before I switched companies I would always pressurize to “running condition”, always put the pressure in my wo summaries etc. and at my new company my service manager said never go above the test pressure of the low side. When I’m in doubt, I just read what the manufacturer wants you to test and if they don’t spec it look for the low side test pressure. Just my

    With this said, I have witnessed leaks with higher pressure vs lower pressure and vise versa. For instants I had a unit hold 100psi but when bumped to 200 found a leak. Also had a unit at 250 not show a leak until I reduced down to 100psi. So what I usually do is if I have a known leaker, if I can’t find it I slowly increase pressure if possible
    Last edited by Bombboy90; 03-18-2020 at 02:35 PM. Reason: Added more info
    “Happiness can be found, even in the darkest of times, if one only remembers to turn on the light.”

  11. #88
    Join Date
    Aug 2008
    Location
    Las Vegas NV
    Posts
    88
    Post Likes
    On new installs I only test @ about 200#. Looking for a leak, I creep it up to whatever it takes (never needed 600# though).

    Straight cool systems 600# will exceed the rated pressure on the evap coil.

    https://www.allstyle.com/see-our-pro...num-coils.html

  12. #89
    Join Date
    Jan 2010
    Posts
    19,279
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    Per Mitsubishi specs
    Attached Images Attached Images    

  13. #90
    Join Date
    Mar 2016
    Location
    Dayton Oh
    Posts
    2,340
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    Quote Originally Posted by VTP99 View Post
    Per Mitsubishi specs
    But but but..... 250 should be fine. Been doing it that way 75 years.


    Sent from my iPhone using Tapatalk

  14. #91
    Join Date
    Jul 2019
    Location
    Oklahoma home its in the name
    Posts
    1,271
    Post Likes
    Has anyone here ever blown anything up from over pressure?
    Or heard of it happening?
    What goes first with over pressure?

    Sent from my "smart" phone using Tapatalk

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