TM 9-4120-388-14
5-11. EVACUATING THE
REFRIGERANT SYSTEM,
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.
Be sure that system was leak tested and has NO LEAKS.
a.
NOTE
In the event that the compressor was replaced as result of a burn out, check that com-
pressor burn out procedures were followed. (See para 5-21.)
Be sure that new filter-drier was installed. If not, install one.
b.
Be sure that both service valves and charging manifold valves are closed.
c.
Attach hose assemblies to service valves and charging manifold valves.
d.
Attach center hose assembly to vacuum pump.
e.
f.
Start vacuum pump.
Open charging manifold valves.
g.
h.
Open both unit service valves.