Vacuum Pump Tips... Using the Ritchie YELLOW JACKET SuperEvac Plus II to add some must know tips about your pump. Most vacuum pumps have an ultimate pull down between 15 to 30 microns. A periodic check with a working micron gauge will determine if the pump is working properly. #vacuumratedaf #hvac #hvacr #refrigeration #vacuumpumpbasics #500microns #hvacinstall #hvacservice #hvaceducation #hvacknowledge #hvacaf #realhvacreallife | HVAC Know It All