anyone ever use an old compressor from a fridge to evac their a/c system,if so is there any tricks to wiring/plumbing.I have a venturi type vac pump but im not sure if my compressor can keep up,its only a 17 gal tank,I think it is 3.5 HP with a 150 psi max.
My current vacuum pump is a refrigerator hermetic unit (motor & compressor in one unit). It was a freebe from a local used appliance store. I bolted it down to a piece of plywood & soldered a 1/4" flare fitting on the suction line. It works great, pulls 29" of vacuum in about 10 minutes or less. I have used it several times and have had excellent results.