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Close valves A and B, and observe vacuum gauge for a few minutes. A rise in pressure would indicate a possible leak or moisture remaining in the system. With valves A and B closed, stop the vacuum pump. 4) Remove the hose from the vacuum pump and place it on the charging cylinder. See Figure 22B. Open valve C. Discharge the line at the manifold connection. 5) The system is now ready for final charging. 7. Recharge as follows : 1) Refrigeration cycle systems are charged from the High-side. If the