TM 9-4120-388-14
5-11. EVACUATING THE REFRIGERANT SYSTEM - Continued.
i.
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.
Continue running the pump for one more hour, while observing the gage. If the gage needle moves back and
j.
forth, you have a leak which must be located and corrected first.
k
Close both unit service valves.
l.
Close charging manifold valves.
m.
Stop vacuum pump.
n.
Disconnect pump from center hose connection.
o.
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