System Description

SYSTEM

REFRIGERATION SYSTEM : System Description


REFRIGERANT CYCLE

Refrigerant Flow
The basic path of refrigerant flow is through the electric compressor, condenser, liquid tank, and evaporator, and then it returns to the electric compressor. The vaporization of evaporator refrigerant is controlled by the expansion valve.
Evaporator Cryoprotective Protection Control
- If the air temperature after passing through the evaporator (detected by the intake sensor) is 1�C (34�F) or less, the A/C auto amp. sends a request for speed 0 rpm to the electric compressor.
- Based on this signal from the A/C auto amp., the electric compressor stops.

REFRIGERANT SYSTEM PROTECTION

Refrigerant Pressure Sensor
- The refrigerant system is protected from significant high pressure and low pressure by the refrigerant pressure sensor that is installed at the condenser outlet.
- The refrigerant pressure sensor outputs a signal to the VCM.
- If the A/C auto amp., judges that there is a malfunction (the conditions shown below) in the cooler cycle based on the refrigerant pressure sensor detection value sent from VCM via EV CAN communications, it stops operation of the electric compressor.
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- Approximately 2,650 kPa (27.0 kg/cm, 384.3 psi) or more
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- Approximately 140 kPa (1.4 kg/cm, 20.3 psi) or less
NOTE:
The values indicate gauge pressure.
Pressure Relief Valve
- The refrigerant system is protected from significant high pressure by the pressure relief valve that is installed in the electric compressor.
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- If the pressure in the cooler cycle is excessively increased [3,500 kPa (35.7 kg/cm, 507.5 psi) - 4,140 kPa
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(42.2 kg/cm, 600.3 psi) or more], the pressure relief valve opens, releasing refrigerant into the atmosphere.