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Section II OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
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TM-5-4120-359-14 Air Conditioner Split Package 18 000 BTU/HR Cooling 30 000 BTU/HR Heating 208 Volt 3 Phase 400 Hertz Manual
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Figure 2-5. Intake and Discharge Openings and Drains
TM 5-4120-359-14
Section III OPERATION UNDER USUAL CONDITIONS
The operator/crew is limited to operating the air conditioner in COOL, LOW HEAT, and HIGH HEAT modes.  For
assembly and preparation for use, operational checks and preparation for movement refer to organizational maintenance.
2-4. GENERAL OPERATING PROCEDURES
a. Before operation
(1) Check to se that power is connected to the unit by pressing the RUN INDICATOR LIGHT. It should light
when pressed in.
Figure 2-3. Run Indicator Light
(2) When the military operational situation permits, it is good practice to have power connected to the unit at least
six hours before operating in the COOL mode. This allows the crankcase heater to raise the compressor oil temperature
to the normal operating temperature. This will help to extend the compressor life. In cases where military operational
requirements demand, the unit may be turned on to the COOL mode immediately after connection of power; however, the
more warm-up time that can be allowed during the off cycle the better it will be for the compressor.
CAUTION
If there is a loud banging noise coming from the condenser section when the unit
is operated in the COOL mode, immediately turn the MODE SELECTOR SWITCH to
OFF. Allow at least one hour of warm up time before attempting a restart in the
COOL mode.
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