High Refrigerant Pressure Cutout Switch. This switch is factory set to shut the compressor off if the
refrigerant discharge line pressure rises to 435 to 455 psig (30.58 to 31.99 kg/cm2).
This switch must be hand reset after the pressure drops to 320 psig (22.50 kg/cm2).
Compressor Circuit Breaker. Protects the compressor.
Mode Selector Switch. Allows selection of unit operating mode.
Low Refrigerant Pressure Cutout Switch. This switch is factory set to shut the compressor off if the
refrigerant suction line pressure drops to 10 to 20 psig (0.703 to 1.406 kg/cm2). This switch must be hand reset
after the pressure rises above 40 psig (2.812 kg/cm2).
Evaporator Fan Speed. Allows selection of unit conditioned (evaporator) fan speed.
Temperature Selector (Thermostat) Switch. This switch allows selection of the desired temperature
while operating in the cool or heat modes.
Ground Connection Point. Shelter or van electrical ground connection point.
Condenser Discharge Air Louver Assembly. This louver assembly is automatically controlled by the
actuating cylinder, item 40.
Condenser Air Inlet Guard. This expanded metal screen protects the condenser from damage.
Fresh Air Ventilation Guard. Screens and filters fresh air entering the unit.
The air conditioner can be equipped for operation in chemical-biological-radiological (CBR)
environment by connecting filtering equipment to the fresh air filter.
Relief Valve. This safety valve opens when the refrigerant discharge line pressure rises above 540
psig 37.97 kg/cm2).
Charging Valve, Refrigerant Suction Line. Provides a connection point for charging and checking
suction line pressure.
Charging Valve, Refrigerant Discharge Line. Provides a connection point for charging and
checking discharge line pressure.
SoIenoid Valve, Pressure Equalizing. This valve is normally open when the compressor is NOT
running to equalize the pressure at the suction and discharge sides of the compressor. It closes when the
Condenser Fan and Motor. This fan and motor draws outside air over the condenser coil to remove
heat from the refrigerant passing through the tubes of the condenser coil.
Compressor. Consists of a reciprocating compressor driven by an electrical motor, hermetically
sealed inside a steel container with Iifetime charge of oil. An external (crankcase) heater surrounds the Iower
part of the container. The purpose of the heater is to prevent possible damage to the compressor caused by
liquid refrigerant accumulation in the cylinders during a period of shut down. The heater is connected directly
to input power and is thermostatically controlled to prevent overheating.
Condenser Coil. Made up of interconnected parallel copper tubes retained in a series of multiple
closely spaced aluminum fins. This coil serves as a heat exchanger to remove the heat from the compressed
refrigerant vapor so that it will condense into a liquid.