I quit doing sealed system work for a while and decided recently to start doing them again. After yesterday's frustration, I might quit doing them again. Did a refrigerator compressor job on Subzero 550. Went to charge it and could only get it to take 3 oz., it takes 10 oz. I'm charging with R12 (yes, I still have R12) as a gas on the low side. The low side won't draw down, it's showing 70psi and the high side is not much higher. The low side actually dropped pressure when I shut the compressor off. The compressor tech sheet showed the process tube on the same side as the high side tube. That wasn't convenient so I used it for the suction line. I've done that before with no problems. What did I do wrong?
How long should it take to do this job. If I hadn't run into the problems, it would have taken me 3 hours. I don't sweep charge, I use a vacuum pump and micron gauge. It would be nice to get this down to 2 hours, if possible.