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TM 9-4120-389-14
y. Install service valve protective caps.
z. Using screwdriver, secure charging valve access cover with eight screws.
5-9. REFRIGERANT PRESSURE CHECK
Preliminary procedure. Remove access cover (See para. 4-15).
Except in cases where it is obvious that the refrigerant charge has been lost, the first step in troubleshooting
problems in the refrigeration system should be to check discharge and suction pressures under operating
conditions. Check pressures as follows:
a. Turn the mode selector switch to OFF.
b. Remove protective caps from charging valves.
Figure 5-5. Pressure Test Connection
5-17
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