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!
Had the same issue. Nylog and tightening the fitting took care of it.
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Is it the NPT side of the fitting that threads into the manifold?
I had the same problem when I got mine. Just wrenched it with more muscle than the manual said I should do. Lol
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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.
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.
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.
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!
What do you mean by leaking?
Originally Posted by filiberto
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.
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
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Have you tried to zero them under a low vacuum in the psia mode?
Originally Posted by hvac wiz 79
Depending where you are they will not read zero psig
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The low side transducer has a higher sensitivity and will read slightly different to the high side.
Originally Posted by hvac wiz 79
Last edited by kiwireeferman; 01-08-2013 at 01:30 PM.
Reason: missing text
Sorry bud, I assume you are an engineer and have trouble making a simple connection! OMG.
Originally Posted by Questor