Table 1. Location and Description of Major Components.

TM 9-4120-428-14

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COMPONENT

DESCRIPTION

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

The actuating cylinder, Item 39, automatically controls this louver assembly.

Condenser Air Inlet Guard

This expanded metal screen protects the c ondenser from damage.

Fresh Air Ventilation Guard

Screens and filters fresh air entering the unit.

Note: The air conditioner can be equipped for operation in nuclear-biological-

chemical (NBC) 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.

Solenoid 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 compressor starts.

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 a lifetime charge of oil. An

external (crankcase) heater is attached to the lower part of the container. The

purpose of the heater is to prevent possible damage to the compressor caused

by Iiquid refrigerant accumulation in the crankcase 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.

Dehydrator, Desiccant, Refrigerant

Removes moisture and contaminants from the refrigerant.

(Filter/Drier)

Receiver

The receiver acts as a storage tank for the liquid refrigerant.

Solenoid Value, Liquid Line

This valve is normally open when the compressor is NOT running and is

thermostatically controlled during cooling cycles when operating in the

COOL mode.

Pressure Regulating Valve

This valve regulates the suction pressure by re-circulating a part of the

compressor discharge hot gas to the suction line when the suction pressure

drops below a preset value. This action prevents frosting of the evaporator

coil.

Expansion Valve

Meters refrigerant flow to the evaporator during cooling cycles when

operating in the COOL mode.

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