What is the required vacuum level for the system before refrigerant charging?

Use a vacuum pump that attains 0.5 Torr (65 Pa) or lower degree of vacuum after 5 minutes of operation. After the degree of vacuum has reached 5 Torr (650 Pa), evacuate for an additional 1 hour. Verify that the vacuum degree has not risen by more than 1 Torr (130 Pa) one hour after evacuation. (Page 12)