Respuesta :
When evacuating a system after leak testing, the technician should use a micron gauge along with the vacuum pump and pump the system down to 500 microns.
Vacuum pumps are evaluated in CFM (cubic feet per minute), and bigger isn't always better or faster. An oil change is required every time you evacuate. It's not a lot as much of the water you remove from your system will condense in the oil. Low side compound gauges are designed to read pressure, not vacuum.
Once the vacuum is below 500 microns, disconnect the system from the service hose, manifold, vacuum pump, exhaust tool valve or hose ball valve. The vacuum should be stable and stay below 500 microns. If the vacuum rises slowly and then stops, there is moisture in the system and the evacuation should continue.
When the vacuum rises to atmospheric pressure, there is a leak that needs repairing. If you can maintain a vacuum of 500 microns or less, you know you have a clean, dry, leak-free air conditioning or refrigeration system.
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