Nissan Leaf. Instruction — part 739
HA-78
< SYSTEM DESCRIPTION >
[WITHOUT HEAT PUMP SYSTEM]
COMPONENT PARTS
• A scroll-type compressor is used. The motor drive force is used to rotate the moveable scroll and perform
refrigerant intake, compression, and discharge.
Refrigerant and Compressor Oil
INFOID:0000000010122151
• The refrigerant is HFC-134a, which contains no chlorine (Cl), a substance which damages the ozone layer.
• The compressor oil is ND-OIL 11, an ester oil with high insulation performance, designed especially for elec-
tric compressors.
CAUTION:
• The special electric compressor oil has different properties from the conventional HFC-134a com-
pressor oil (PAG oil) and CFC-12 compressor oil (mineral oil). Be sure not to mix these oil types with
the compressor oil, as doing so may cause electric leakage.
NOTE:
• HFC: HydroFluoroCarbon
• CFC: ChloroFluoroCarbon
High Voltage Warning Label
INFOID:0000000010122152
• High voltage warning label is stuck on each component parts below.
• When replacing component parts make sure to stick it on original position.
Electric Compressor
The label (1) is stuck on the compressor stay.
PTC Heater
JSIIA1625GB
: Application direction of the label
JMIIA2629ZZ
COMPONENT PARTS
HA-79
< SYSTEM DESCRIPTION >
[WITHOUT HEAT PUMP SYSTEM]
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The label (1) is stuck on the housing of PTC heater.
JMIIA2585ZZ
HA-80
< SYSTEM DESCRIPTION >
[WITHOUT HEAT PUMP SYSTEM]
SYSTEM
SYSTEM
REFRIGERATION SYSTEM
REFRIGERATION SYSTEM : System Diagram
INFOID:0000000010122153
REFRIGERATION SYSTEM : System Description
INFOID:0000000010122154
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 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 pres-
sure sensor that is installed on the liquid tank.
• 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.
- Approximately 2,650 kPa (26.5 bar, 27.0 kg/cm
2
, 384.3 psi) or more
- Approximately 140 kPa (1.4 bar, 1.4 kg/cm
2
, 20.3 psi) or less
NOTE:
The values indicate gauge pressure.
Pressure Relief Valve
JSIIA1637GB
SYSTEM
HA-81
< SYSTEM DESCRIPTION >
[WITHOUT HEAT PUMP SYSTEM]
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• The refrigerant system is protected from significant high pressure by the pressure relief valve that is installed
in the electric compressor.
• If the pressure in the cooler cycle is excessively increased [3,500 kPa (35 bar, 35.7 kg/cm
2
, 507.5 psi) -
4,140 kPa (41.4 bar, 42.2 kg/cm
2
, 600.3 psi) or more], the pressure relief valve opens, releasing refrigerant
into the atmosphere.
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