I just repaired a single stage cpu condensing unit (machII), had a crack in the suction line. I replaced the suction line, filter drier, then charged with r404a, system uses a capillary tube as a metering device.

When I run the unit everything seems ok at first, pressures ok, it cools down to -52. After about 4mins the temp starts increasing, also at the same time the low side goes lower and lower until it's in quite a deep vacuum. The high side pressure is also unusually high, starts off high but gets a little higher as the low side goes lower. Also when I switch off the unit the low and high side pressures do not equalize, only after a few hours do they equalize.

I'm suspecting a blockage somewhere, what do you guy's think? I have never seen these symptoms, very unusual for me.