Evacuation

1. If not yet connected, connect the manifold gauge set.
2. Leak test the refrigerant system.
3. Discharge the refrigerant system. Discharging and Recovery
4. Verify that both manifold gauge valves are turned all the way to the right.
5. Check that the center hose connection at the manifold gauge set is tight.
6. Connect the center hose of the manifold gauge set to a vacuum pump.
7. Open the manifold gauge set valves and start the vacuum pump.
8. Evacuate the system with the vacuum pump until the low-pressure gauge reads at least 84 kPa (25 in-Hg) vacuum or as close to 101 kPa (30 in-Hg) as possible. Continue to operate the vacuum pump for 15 minutes. If a part of the system has been replaced, continue to operate the vacuum pump for another 20 to 30 minutes.
9. When evacuation of the system is complete, close the manifold gauge set valves and turn off the vacuum pump.
10. Observe the low-pressure gauge for 5 minutes to be sure the system vacuum is held. If vacuum is held, charge the system. If vacuum is not held for 5 minutes, leak test the system, service the leaks, and evacuate the system again.