Evacuation

1. Connect the manifold gauge set.
2. Leak test the system.
3. Discharge the refrigerant system.
4. Ensure both manifold gauge valves are turned all the way to the right.
5. Ensure the center hose connection at the manifold gauge is tight.
6. Connect the manifold gauge set center hose 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 low pressure gauge reads at least 84.2 kPa (25 in Hg) (vacuum) or as close to 101.04 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 the vacuum pump off.
10. Observe the low pressure gauge for 5 minutes to ensure 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.