exsearsguy
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Charlie a sweep charge is basically using your compressor as the vacuum pump. Hook your gauges( remember to purge your hoses) to the high and lo sides,make sure they're closed and then fire up the unit.Open the hi side and let the old junk out.When it's about empty(you can tell by the sound and pressure readings),close it up and then add some R-22, let it run a little while.Then let the new gas out.Should be pretty clean now and ready to charge. Don't let it get plumb empty when you're doing this.The refrigerant helps move the oil to the compressor and if you let it run empty you might damage your compressor.Just be careful and it 'll be ok.
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