Section III OPERATION UNDER USUAL CONDITIONS

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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