TM 9-4120-371-14
The refrigeration system must be evacuated to remove all moisture before it is charged with refrigerant-22.
Don't evacuate a leaking system. The vacuum created can cause air, moisture, and
dirt to enter system.
a. Check that system was leak tested and has NO LEAKS.
NOTE
In the event that the compressor was replaced as result of a burn out, check that
compressor burn out procedures were followed. (See para 5-20.)
b. Check that new filter~drier was installed. If not, install one.
c. Check that both service valves and 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.
