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TM 9-4120-389-14
SECTION III OPERATION UNDER USUAL CONDITIONS.
2-5. ASSEMBLY AND PREPARATION FOR USE.
Services of Unit Maintenance should be employed for original unpacking, assembly installation, and
preparation for use. See para. 4-2 thru 4-9.
2-6. INITIAL ADJUSTMENTS AND CHECKS.
a. Inspect all covers, louvers and guards for loose mounting, obstructions, or shipping damage. Report
any deficiencies to unit 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 VAC, 3 phase, 4 wire,
50/60 hertz power, and to the input power connector on the unit.
CAUTION
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 warmup period is recommended.
(2) Check that fabric cover has been unsnapped, rolled up, and secured with both straps.
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