TM 9-4120-402-14
2-7. GENERAL OPERATING PROCEDURES. - continued
Figure 2-4. Air Openings and Drains
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 warm up period is recommended.
Before starting the air conditioner in COOL 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 to avoid damage to equipment.
f. Table 2-2 lists the recommended control settings for the desired mode of operation. Minor adjustments may be
made to get the desired mixture of recirculated and fresh air and the air flow patterns of conditioned air.
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