Figure 5-4. Evacuation of Refrigerant System

TM5-4120-347-14

Figure 5-4. Evacuation of Refrigerant System

NOTE

Inability to reach 29 inches of mercury may indicate either a leak or a problem with the pump.

j. Continue running the pump for one more hour, while observing the gage. If the gage needle moves back

and forth, you have a leak which must be located and corrected first.

Close charging manifoid valves.

Close both unit charging valves.

Stop vacuum pump.

Disconnect pump from center hose connection.

Go to paragraph 5-14, charging the refrigeration system.

After the system has been satisfactorily evacuated, it must be fully charged with Refrigerant-22.

Never introduce liquid refrigerant into the low pressure (suction) charging valve.