I got a call from a homeowner who had obtained an EPA card and he decided to buy himself a set of gauges and a tank of R22 to charge his own system. He was having a problem with the system showing 375lbs on the low side before he shut it off. When I got there I first told him he had his gauges on the wrong sides, he did have 375lbs but it was on the high side.
To make a long story short, I removed over ten pounds of refrigerant on a 2.5 ton system.
When I left the system was running ok, but I was wondering how much refrigerant do you need to put into a system to kill it? I do have a new found appreciation on how tough they make these compressors.