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  1. #40
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    Quote Originally Posted by R600a View Post
    The Leak Detection manual from refrigeration Technologies is a must read at least once.

    Sent from mars using Tapatalk
    A lot of manuals need to be read!

  2. Likes R600a liked this post.
  3. #41
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    Quote Originally Posted by HAWK71 View Post
    Usually 200 is sufficient
    there you go
    Visit our website at www.airconcomfortcooling.com

  4. #42
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    Quote Originally Posted by pecmsg View Post
    How many microns?
    well you can google it or you tube
    Visit our website at www.airconcomfortcooling.com

  5. #43
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    Quote Originally Posted by pecmsg View Post
    A lot of manuals need to be read!
    yes if someone is willing to learn
    Visit our website at www.airconcomfortcooling.com

  6. #44
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    May 2014
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    Had a co-worker call me in desperation, said there's refrigerant everywhere, but can't pin point the leak. Asked him what the pressure is, he was up around 400-450. Told him to back it way down, then try again. 3-5 ton York roof top unit.

    Called me up a half hour later, still no luck.

    So I swing by. He still has it at high pressure. I ask him why? I think he was just flustered and figured more was better. By this point he's got Big Blue everywhere, which is a danger for my leak detector. Anyway, I take it down by half, still refrigerant every where. Take it down by half again, rinse and repeat. Think I took it down by half a third time. Awhile ago, can't remember for sure.

    Anyway, now the traces are getting much more slim. The area where we were picking up the most refrigerant no longer triggered. Moved my probe around randomly, and it began triggering near the condenser coil. I'm like NOW get the Big Blue out. Ended up being several small leaks on the micro channel coil sort of clustered right around the middle of the coil.

    Told him, that's why more pressure is not better.


    Quote Originally Posted by joemach View Post
    I usually do 75-100 lbs, then soap my braze joints. The reason being that at 200+ lbs a small leak will just blow the bubbles away and I will not see them. Once I am satisfied with no leaks, I then pump up to manufacturer's recommended pressure.

    I figure there was a reason someone included the install manual with the equipment.
    I do a triple evac with nitro to remove non condensables.

  7. #45
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    May 2018
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    Quote Originally Posted by BBeerme View Post
    Had a co-worker call me in desperation, said there's refrigerant everywhere, but can't pin point the leak. Asked him what the pressure is, he was up around 400-450. Told him to back it way down, then try again. 3-5 ton York roof top unit.

    Called me up a half hour later, still no luck.

    So I swing by. He still has it at high pressure. I ask him why? I think he was just flustered and figured more was better. By this point he's got Big Blue everywhere, which is a danger for my leak detector. Anyway, I take it down by half, still refrigerant every where. Take it down by half again, rinse and repeat. Think I took it down by half a third time. Awhile ago, can't remember for sure.

    Anyway, now the traces are getting much more slim. The area where we were picking up the most refrigerant no longer triggered. Moved my probe around randomly, and it began triggering near the condenser coil. I'm like NOW get the Big Blue out. Ended up being several small leaks on the micro channel coil sort of clustered right around the middle of the coil.

    Told him, that's why more pressure is not better.
    well here another example that im right
    Visit our website at www.airconcomfortcooling.com

  8. #46
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    Quote Originally Posted by AIRCON8 View Post
    well here another example that im right
    B S

  9. #47
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    Quote Originally Posted by AIRCON8 View Post
    well here another example that im right
    Ahhh....the jury is still out on that ....

  10. #48
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    Quote Originally Posted by pecmsg View Post
    B S
    Ive posted documents supporting my opinion.

    Please do the same!

  11. #49
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    Guys, keep in mind, I think we are talking about two separate things.

    One would be pressures to maintain after a new install of a mini split. Required to keep the warranty.

    The other, as I just related, was a repair on an existing install.

    Two totally different things.
    I do a triple evac with nitro to remove non condensables.

  12. #50
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    Jan 2010
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    Do you have low sensitivity on your sniffer ?

  13. #51
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    Probably 1/2 of one ounce per year. Is that low enough?


    Quote Originally Posted by VTP99 View Post
    Do you have low sensitivity on your sniffer ?
    I do a triple evac with nitro to remove non condensables.

  14. #52
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    Quote Originally Posted by BBeerme View Post
    Probably 1/2 of one ounce per year. Is that low enough?

    Not what I'm referring to
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