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figure 1-5. wiring diagram
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TM-5-4120-361-14 Air Conditioner Vertical Compact 18 000 BTU/HR 208 Volts 3 Phase 50/60 Hz (Model 18K 208 3 60) Manual
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Low Heat.
TM 5-4120-361-14 CHAPTER 2 OPERATING  INSTRUCTIONS If equipment fails to operate refer to troubleshooting pro- cedures in chapter 3. Section  I. CONTROLS AND INSTRUMENTS. 2-1. General. This section describes, locates and illustrates the various controls and provides  the  operator/crew  sufficient information to insure proper operation of the air conditioner. 2-2. Controls and Instruments. a. General. The location and the function   controls   and   instruments are illustrated in figure 2-1. The con- trol module contains the control circuit breaker, the manually operated tempera- ture selector switch, mode selector switch, evaporator fan speed switch and compressor circuit breaker. The control module Is designed to permit remote con- trol operation of the air conditioner when connected with a remote control cable. The thermostatic control point of the air temperature is determined by the location of the temperature selector switch sensing bulb. Normally, the air conditioner is operated with the con- trol module remaining on the unit and the sensing bulb of temperature selec- tor switch located in the inlet air stream inside the unit evaporator sec- tion. b. Temperature Selector Switch. The temmrature  selector  switch   is a thermo- static switch which responds to temper- ature variations from 60°F in the maxi- mum cooler position to 90°F (15.6°C to 32.2°C) in maximum warmer position. The best preliminary adjustment of the temp- erature selector is midway between the cooler and warmer positions, corre- sponding to approximately 75°F (24°C). A ten minute period should be allowed be- tween adjustments of the temperature selector for the full effect of the ad- justment to be realized. Once the de- sired temperature of the air conditioner space is obtained, no further adjust- ment is required for either cooling or heating modes of operation. c. Mode Selector Switch. The mode selector  switch  iS an  electrical  switch that can be manually positioned to se- lect the desired operational mode of the air conditioner. The five positions of the mode selector are: (1) Off. The off mode position is used to stop operation. All major elec- trical components are isolated from electrical power except the compressor crankcase heater, which is thermostat- ically controlled as long as input power is connected to the unit. (2) Vent. In the vent mode posi- tion, the evaporator motor operates and the fans circulate filtered air. Venti- lation air will be drawn into the unit through the fresh air filter and vent duct if the damper door in the vent duct is  open. Some cooling effect will occur if the ventilation air is cold. Venti- lation air flow is controlled by open- ing and closing the damper door with the vent adjusting knob. (3) Cooler. In the cooler mode position, the refrigerant cycle begins, and the unit will cool under the thermo- static control of the temperature selec- tor switch. The evaporator fan motor, condenser fan motors and compressor are activated and will operate continuously. The speed of the evaporator fan motor is controlled by manually selecting the de- sired speed position of the evaporator fan  speed  switch. The speed of conden- ser fan motors is automatically con- trolled by an outdoor thermal switch. The motors will operate in low speed when ambient temperature is below 100°F (38°C). The thermal switch automatic- ally switches the motors to high speed if ambient temperature rises above 100°F (38°C). To prevent starting surge cur- rent of the compressor coinciding with the starting surge current of the fan motors, the compressor starts about 30 2-1

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