TM 9-4120-388-14
Section Ill. OPERATION UNDER USUAL CONDITIONS
2-5. ASSEMBLY AND PREPARATION FOR USE. Services of unit maintenance should be responsible for unpacking,
assembly, installation, and preparation for use. See paragraphs 4-2 through 4-11.
Inspect all covers, panels, grilles, and screens for loose mounting, obstructions, or shipping damage. Report
a.
any deficiencies to unit maintenance.
b. Perform the preventive maintenance checks and services listed in Table 2-1.
2-7. GENERAL OPERATING PROCEDURES.
Before operation:
a.
(1)
Be sure the power cable has been connected to a source of 208 volt, 3 phase, 4 wire, 50/60 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 warmup period is recommended.
Be sure that fabric cover has been unsnapped, rolled up, and secured with both straps to the two turnbutton
(2)
fasteners.
Under normal operating conditions, before starting the air conditioner in any
mode, make sure that the fabric condenser cover on the back of the condenser
section is rolled up and secured and that all screens and guards are in place and
unobstructed.
