Chapter 2. OPERATING INSTRUCTIONS - TM-5-4120-386-140017

TM 5-4120-386-14

CHAPTER 2

OPERATING INSTRUCTIONS

Section I DESCRIPTION AND USE. OF CONTROLS AND INDICATORS

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. OPERATOR'S CONTROLS.

a. 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 the unit. With the fan

motor and compressor operating, the flow within the refrigerant circuit is controlled by

the temperature 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.

b. 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.

c. 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.

2-1