In all but emergency situations it is desirable to evacuate the compressor with a vacuum pump rather than with the compressor itself. However, if you do not have a vacuum pump available, use the following procedure:

1. Disconnect the connection in the compressor discharge gage line, between the discharge line stop valve and the compressor.

2. Start the compressor and let it run until the greatest possible vacuum is obtained.

3. Stop the compressor and immediately open the suction stop valve slightly in order to blow refrigerant through the compressor valves and purge the air above the discharge valves through the open gage line.

Figure 6-8.Capacity control system.

4. Close the discharge gage line and open the discharge line stop valve.

5. Remove all oil from the exterior of the compressor, and test the compressor joints for leakage, using the halide leak detector.