CHARGING THE REFRIGERATION SYSTEM

TM 5-4120-359-14

h. Open both unit service valves.

Run the vacuum pump until at least 29 inches of mercury, measured on the gage, is reached.

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 manifold valves.

Close both unit service valves.

m. Stop vacuum pump.

n. Disconnect pump from center hose connection.

o. Go to paragraph 4-10, charging the refrigeration system.

4-10. CHARGING THE REFRIGERATION SYSTEM

Supplies: Dehydrator

Refrigerant 22 (Drum) (item 8, Appendix E}

Figure 4-7. Refrigerant Charging

4-33