The Yellow Jacket 93530 8 cfm; 115V/60 Hz SuperEvac Pump is a 2-stage rotary vane design that increases efficiency and speeds pump down to 15 microns. The pump lowers the internal pressure of a refrigeration system until moisture boils into a vapor. As the moisture is vaporized, it is evacuated by the pump, helping dehydrate the system. Most technicians try to achieve between 250 and 1000 microns. During new system set-up, protective caps are removed admitting moisture and air into system components. If air – a non-condensable – remains in the system, it collects on the high side reducing system efficiency. This causes a rise in head pressure. The discharge valve gets hotter than normal and organic solids form causing compressor failure.

Moisture in the system can form ice which closes off openings in expansion valves and cap tubes, and prevents adequate cooling. Ultimately moisture and air can produce acids and sludge which could cause in-warranty failures. A vacuum pump "pulls" air and moisture out of the system before the system is damaged. The higher and more complete the vacuum, the more moisture is removed. That's why your SuperEvac pump is specifically engineered for high vacuums of 50 microns and better.