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TM 9-4120-389-14
a. Check that system was leak tested and has NO LEAKS (See para. 5-6).
b. Check that new filter-drier was installed. If not, install one (See para. 5-10).
c. Check that both charging manifold valves are closed.
d. Attach hose assemblies to service valves and charging manifold valves.
e. Attach center hose assembly to vacuum pump.
f. Start vacuum pump.
g. Open charging manifold valves.
h. 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.
i. 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.
j. Close charging manifold valves.
k. Stop vacuum pump.
I. Disconnect pump from center hose connection.
m. Charge the refrigeration system per para. 5-8.
5-8. CHARGING THE REFRIGERATION SYSTEM
Supplies:
Dehydrator
Refrigerant-22 (Drum) (item 10, Appendix E)
5-13
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