New Digi Cool AK900 leak
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  1. #1
    Join Date
    Jan 2009
    Location
    PNW
    Posts
    14

    Unhappy New Digi Cool AK900 leak

    So, I've been waffling over a set of digital gauges, and after much research and decision making, I finally bit the bullet and picked up the Digi-Cool AK900.

    Upon initial assembly of the new AK900, I discovered there was a leak on the low side where the manifold connects to the DRSA. After applying nylog and re-seating, I tested with nitrogen and the manifold and hoses showed no leaks at any point, so I figured it was good to go...

    Working on 134a cap tube reach in that wasn't pulling down to temp, got to work, and after charging the system, during final checks as it was pulling down to temp, found that AGAIN, the low side connection to the manifold of the DRSA was leaking, so I took them off.

    Later I hooked up my nitrogen bottle and found gas blowing out of the low side connection to the AK900, same place as before, right out at the connection to the manifold! I looked over the fittings again, re-seated and AGAIN pressure tested it, and have no idea why it suddenly let vapor blow out like that, after also holding pressure for some time when charging... The nitrogen stream at 100psi was quite audible and obvious.

    The AK900 manual explicitly cautions against overtightening these, but perhaps I took this too seriously.

    I'm so bummed, I now don't trust these gauges / manifold 100%, has anyone else seen this?! Perhaps I didn't seat them right, or there was a spec of machine chaff or flash in there, I visually inspected the seat and connection points and all seemed fine. This will be the third time I've connected the manifold to the AK900 and we'll see how it goes!

  2. #2
    Join Date
    Dec 2008
    Location
    Buffalo NY
    Posts
    3,078
    Had the same issue. Nylog and tightening the fitting took care of it.


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  3. #3
    Join Date
    Jul 2006
    Location
    Anytown USA
    Posts
    2,053
    Is it the NPT side of the fitting that threads into the manifold?

  4. #4
    Join Date
    Jul 2012
    Location
    Athens, GA.
    Posts
    143
    I had the same problem when I got mine. Just wrenched it with more muscle than the manual said I should do. Lol

    3pt - sent this from his DUMB-PHONE

  5. #5
    Join Date
    Jan 2009
    Location
    PNW
    Posts
    14
    Thanks all, I'll tighten those connections a little bit and see how it goes!

    FWIW - the leak is at the nut that connects the manifold to the AK900 not the NPT side, those seem secure.

  6. #6
    Join Date
    Mar 2011
    Location
    Birmingham, AL
    Posts
    22
    My high-side valve on my 9-month old AK's have started leaking. Anyone know if there is a repair part that is field-replaceable?
    I've emailed Brenda, just waiting for a response.

  7. #7
    Join Date
    May 2011
    Location
    Oklahoma
    Posts
    362
    Subscribing.... wonder if this is a wide spread issue.

    I've been on the fence with these for quite some time. I always end up one click away from confirming my order.

  8. #8
    Join Date
    May 2011
    Location
    Indiana
    Posts
    2
    I bought a set of AK900 Gauges last summer and the only problem I had was the high side hose connection leaked after hooking up to a running system. I tightened it down good (don't be scared) with a pair of channel locks and it solved the problem. I will probably take it apart and use nylog on it before the cooling season comes up next year. Other than that small (easily fixable) problem I have had nothing but positive things to say about these gauges. To anyone that is on the fence about these, buy them, you will not be disappointed!

  9. #9
    Join Date
    Jan 2008
    Location
    In the work truck
    Posts
    2,990
    Quote Originally Posted by filiberto View Post
    My high-side valve on my 9-month old AK's have started leaking. Anyone know if there is a repair part that is field-replaceable?
    I've emailed Brenda, just waiting for a response.
    What do you mean by leaking?

    Did you try tightening up that allen screw on the side of the manifold? I would bet that is your issue!
    Be careful, It does not take much. Youll fell the knob hard to turn if you over tighten it.
    Gotta have the right tool for the job!

    Where is all the stuff MADE IN THE USA?

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  10. #10
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,381
    I had to tighten that Allen screw as mine was leaking into the system not out. It was a WIF that I just had repaired a leak on. I added adequate charge to start the pull down ... go inside to check temps . . Came back to roof to see the left half of manifold frozen over including my hose. Checked the scale and it was -3lbs from where I left it. Not an overcharge as a result but could of been. The valve was off ... tightened the screw been ok since. I can tell from the way these are assembled they do not test them at the factory which I bet isn't uncommon for a manifold. The gauge itself have been good. Only thing that irks me is the fact I can't have equal pressures other than 0

    Sent from my SGH-T999 using Tapatalk 2

  11. #11
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
    Posts
    6,471
    Quote Originally Posted by hvac wiz 79 View Post
    Only thing that irks me is the fact I can't have equal pressures other than 0

    Sent from my SGH-T999 using Tapatalk 2
    Have you tried to zero them under a low vacuum in the psia mode?
    Depending where you are they will not read zero psig
    “If You Can Dodge A Wrench You Can Dodge A Ball”

  12. #12
    Join Date
    Mar 2006
    Location
    New Zealand
    Posts
    298
    Quote Originally Posted by hvac wiz 79 View Post
    Only thing that irks me is the fact I can't have equal pressures other than 0

    Sent from my SGH-T999 using Tapatalk 2
    The low side transducer has a higher sensitivity and will read slightly different to the high side.
    Last edited by kiwireeferman; 01-08-2013 at 12:30 PM. Reason: missing text

  13. #13
    Join Date
    Mar 2006
    Location
    New Zealand
    Posts
    298
    Quote Originally Posted by Questor View Post
    So, I've been waffling over a set of digital gauges, and after much research and decision making, I finally bit the bullet and picked up the Digi-Cool AK900.

    Upon initial assembly of the new AK900, I discovered there was a leak on the low side where the manifold connects to the DRSA. After applying nylog and re-seating, I tested with nitrogen and the manifold and hoses showed no leaks at any point, so I figured it was good to go...

    Working on 134a cap tube reach in that wasn't pulling down to temp, got to work, and after charging the system, during final checks as it was pulling down to temp, found that AGAIN, the low side connection to the manifold of the DRSA was leaking, so I took them off.

    Later I hooked up my nitrogen bottle and found gas blowing out of the low side connection to the AK900, same place as before, right out at the connection to the manifold! I looked over the fittings again, re-seated and AGAIN pressure tested it, and have no idea why it suddenly let vapor blow out like that, after also holding pressure for some time when charging... The nitrogen stream at 100psi was quite audible and obvious.

    The AK900 manual explicitly cautions against overtightening these, but perhaps I took this too seriously.

    I'm so bummed, I now don't trust these gauges / manifold 100%, has anyone else seen this?! Perhaps I didn't seat them right, or there was a spec of machine chaff or flash in there, I visually inspected the seat and connection points and all seemed fine. This will be the third time I've connected the manifold to the AK900 and we'll see how it goes!
    Sorry bud, I assume you are an engineer and have trouble making a simple connection! OMG.

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