TM 9-4120-378-14
OPERATING INSTRUCTIONS
Section I. DESCRIPTION AND USE OF CONTROLS
2.1 GENERAL. The air conditioner is a self-contained and electric powered unit that provides 10,000 Btu/hr for
cooling or 7,000 Btu/hr for heating. Once started, it operates automatically due to the relationship of the components,
controls and instruments.
2.2
OPERATORS CONTROLS.
2.2.1
Cooling. With the Mode Selector switch in COOL position, the fan motors and the compressor are energized.
The fan motors and compressor run continuously. The flow within the refrigerant circuit determines the cooling mode
of unit. With the fan motor and compressor operating, the flow within the refrigerant circuit is controlled by the Tempera-
ture Selector switch. The evaporator fan speed is controlled by a HIGH or LOW speed switch. The compressor is
protected from current overload by a circuit breaker in the control module.
2.2.2
Heating. With the Mode Selector switch in the HEAT position, air is blown by the evaporator fan as in cooling,
but the heating elements are energized instead of the refrigeration system.
2.2.3
Ventilation. Placing the Mode Selector switch in the VENT position energizes the evaporator fan motor which
forces air out of the evaporator outlet louver into the room. The amount of outdoor air used for ventilation is determined
by the position of the ventilation damper actuator.
