Hey could I get a hand with this write up? I just did a call on an aaon unit and I'm not sure what to write up for repairs.
1 st stage compresser was disabled by a previous tech, he pulled a wire off the contactor.
2 nd stage had a failed contactor and timer relay. worked fine after replacement.
ok 1 st stage.... written on the front panel was "replaced txv, drier, 8-04"
I connected the wire to the contactor, i st fired and immidiately brought head to cutoff at about 375 psi, while suction dropped to arond 40. suction was still in desent when high press cutout killed monentum. right as suction began to hit 40 I could hear the h gas bypass start to open.
At this point I held in the contactor. this time as the head hit about 400, suction was at 20 and the gas bypass opened full throttle. with bypass open, pressures regulated. having bypassed the condenser, pressure gradually rose untill pressure switch pulls the cord @ 375.
I called the senior tech a few minutes ago for advise on the write up. he said the txv is bad, write up a replacement. he disagreed with my thoughts.
my thoughts were....if the txv were once again bad, plugged even, the refrig would stack in the condenser untill the low suction added hot gas, not fire right up to 375 and die in seconds.
he contends that the bypass is already open on startup, is dumping gas right into the compresser and causing an immidiate rise.
problem is I think I'm right, and this is a costly f-up if I replace it just to have it do the same thing. then again I'm a rookie and with the way that thing is piped, if I try to redo the piping and it is a txv problem....and against the advise of the senior tech...im a dick.
point is I really think there is a restriction between the bypass and the condenser.
[Edited by greenears on 07-01-2005 at 06:08 PM]