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TM5-4120-387-14
(h) Connect a nitrogen regulator and cylinder of dry nitrogen to the
center hose connection.
(i) Open the charging manifold valves and the nitrogen cylinder and
regulator valve. Allow system pressure to build up until gages read 350 psi
(24.7 kg/cm2).
(j) Perform leak tests,
then discharge and purge the system, in
accordance with paragraphs 5-6 and 5-7 before performing maintenance, or before
evacuating and charging the system, as appropriate.
(3) Final leak testing.
Always perform a final leak test after performing
any repair or replacement of components before the air conditioner is reassembled
and the refrigeration system is evacuated and charged.
5-10. EVACUATING THE REFRIGERANT SYSTEM
Figure 5-5. Evacuation of Refrigeration 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.
5-15
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