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TM 5-4120-377-14
Section Ill OPERATION UNDER USUAL CONDITIONS
2-5. ASSEMBLY AND PREPARATION FOR USE
Services of organizational maintenance should be employed for original unpacking, assembly installation, and
preparation for use. See paragraphs 4-2 through 4-12.
2-6. INITIAL ADJUSTMENTS AND CHECKS
a. Inspect all covers, panels, grilles, and screens for loose mounting, obstructions, or shipping damage.
Report any deficiencies to organizational maintenance.
b. Perform the preventive maintenance checks and services listed in table 2-1.
2-7. GENERAL OPERATING PROCEDURES
a. Before operation
(1) Check to see that power cable has been connected to a source of 208 volt, 3 phase, 4 wire, 400 hertz
power, and to the input power connector on the unit.
Do not perform the operational check in COOL mode until input power has been supplied
to the unit for at least four hours. Liquid refrigerant tends to migrate into the compressor
crankcase and cylinders during periods when the compressor heater is not operating.
Under moderate climatic conditions, the compressor heater will normally “boil” all liquid
refrigerant out within a four hour period. If the air conditioner has been exposed to below
freezing temperatures without input power, an eight hour warm up period is
recommended.
(2) Check that fabric cover has been unsnapped, rolled up, and secured with both straps to the two
turnbutton fasteners.
Figure 2-3.
Fabric Cover
TS4120-377-14/2-3
2-9
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