Refrigeration System

REFRIGERATION SYSTEM

Refrigerant Cycle

REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank, through the front and rear evaporators, and back to the compressor. The refrigerant evaporation through the evaporator coils are controlled by front and rear externally equalized expansion valves, located inside the front and rear evaporator cases.

Refrigerant System Protection

REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sensor, located on the condenser. If the system pressure rises above or falls below the specifications, the refrigerant pressure sensor detects the pressure inside the refrigerant line and sends a voltage signal to the ECM. The ECM de-energizes the A/C relay to disengage the magnetic compressor clutch when pressure on the high pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/sq.cm, 398 psi), or below about 120 kPa (1.22 kg/sq.cm, 17.4 psi).




PRESSURE RELIEF VALVE
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor. When the pressure of refrigerant in the system increases to an abnormal level [more than 2,990 kPa (30.5 kg/sq.cm, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into the atmosphere.

Component Layout

Exploded View ATC-20 (Part 1):

Exploded View ATC-20 (Part 2):

FRONT REFRIGERATION SYSTEM

Exploded View ATC-21:

REAR REFRIGERATION SYSTEM