Refrigeration Cycle
REFRIGERANT FLOWThe refrigerant flow is in the standard pattern. Refrigerant flows through the compressor, condenser, liquid tank, evaporator, and back to the compressor.
The refrigerant evaporation through the evaporator coil is controlled by an externally pressure equalized expansion valve, located inside the evaporator case.
FREEZE PROTECTION
Under normal operating conditions, when the AUTO is switched ON, the compressor runs continuously, and the evaporator pressure, and therefore temperature, is controlled by the V-6 variable displacement compressor to prevent freeze up.
REFRIGERANT SYSTEM PROTECTION
Triple-pressure switch
The triple-pressure switch is located on the liquid tank. If the system pressure rises or falls out of specifications, the switch opens to interrupt compressor clutch operation. Triple-pressure switch closes to turn on the cooling fan to reduce system pressure.
Fusible plug
Opens at temperatures above 105 °C (221 °F), thereby discharging refrigerant to the atmosphere. If this plug is melted, check the refrigerant line and replace liquid tank.