Nissan Leaf. Manual — part 738
HA-74
< SYSTEM DESCRIPTION >
[WITHOUT HEAT PUMP SYSTEM]
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
REFRIGERATION SYSTEM
REFRIGERATION SYSTEM : Component Parts Location
INFOID:0000000010122144
COMPONENT PARTS LOCATION
COMPONENT PARTS DESCRIPTION
HEATING AND COOLING UNIT ASSEMBLY
A.
Built-in A/C unit assembly
JPIIA1835ZZ
No.
Location
DESCRIPTION
1.
Electric compressor
Performs the intake, compression, and discharge of refrigerant, and circulates the refrigerant in
the cooler cycle. Refer to
.
2.
Condenser
Cools the high-temperature high-pressure refrigerant discharged from compressor to change it
to the liquid refrigerant. Refer to
HA-75, "CONDENSER : Condenser"
3.
Liquid tank
Remove foreign materials from refrigerant that is discharged from condenser, and then tempo-
rarily collect the liquid refrigerant. Refer to
HA-76, "CONDENSER : Liquid Tank"
.
4.
Refrigerant pressure sensor
.
5.
Expansion valve
Turn the high-pressure liquid refrigerant to the misty low-pressure liquid refrigerant by squeezing
action. Refer to
HA-75, "HEATING AND COOLING UNIT ASSEMBLY : Expansion Valve"
6.
Evaporator
The misty liquid refrigerant causes evaporation and turns into gas by the air blown from blower
motor. Cool the air by vaporization heat at this time. Refer to
COMPONENT PARTS
HA-75
< SYSTEM DESCRIPTION >
[WITHOUT HEAT PUMP SYSTEM]
C
D
E
F
G
H
J
K
L
M
A
B
HA
N
O
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HEATING AND COOLING UNIT ASSEMBLY : Heating and Cooling Unit Assembly
INFOID:0000000010122145
This unit combines the blower unit, heating unit, and cooling unit in
an assembly.
HEATING AND COOLING UNIT ASSEMBLY : Evaporator
INFOID:0000000010122146
A thin laminate pipeless evaporator is used.
HEATING AND COOLING UNIT ASSEMBLY : Expansion Valve
INFOID:0000000010122147
The refrigerant temperature is detected by the temperature sensing
part located in low-pressure refrigerant path inside expansion valve.
The lift amount of high-pressure side ball valve is changed to regu-
late the refrigerant flow.
CONDENSER
CONDENSER : Condenser
INFOID:0000000010122148
DESCRIPTION
A sub-cool condenser that combines a parallel-flow condenser and liquid tank in the sub-cool cycle is used.
STRUCTURE AND OPERATION
JMIIA2578ZZ
JSIIA0295GB
JSIIA0244GB
HA-76
< SYSTEM DESCRIPTION >
[WITHOUT HEAT PUMP SYSTEM]
COMPONENT PARTS
The sub-cool section is installed on the condenser, and the liquid refrigerant that exits the liquid tank is further
cooled by the condenser sub-cool section, increasing the amount of heat that the liquid refrigerant can absorb
and improving cooling performance.
CONDENSER : Liquid Tank
INFOID:0000000010122149
• A liquid tank compatible with HFC-134a refrigerant is used.
• A refrigerant pressure sensor for cooler cycle protection control and compressor speed control is installed on
the liquid tank.
Electric Compressor
INFOID:0000000010122150
• An electric scroll compressor is used.
• A 3-phase output inverter with IPM
Note
is used.
• The inverter is adopted to IPM
Note
for smaller size and improved
reliability.
NOTE:
IPM (Intelligent Power Module) is the element which delivered
power device equivalent to IGBT and the protection feature of the
circuit to one package.
NOTE:
IGBT (Insulated Gate Bipolar Transistor) is a transistor which is
suitable for high voltages and large currents and which can control
large electrical power using a small gate voltage.
• The structure integrates the inverter, compressor, and motor, allowing compressor to operate at any speed.
JSIIA1714GB
JMIIA2611ZZ
COMPONENT PARTS
HA-77
< SYSTEM DESCRIPTION >
[WITHOUT HEAT PUMP SYSTEM]
C
D
E
F
G
H
J
K
L
M
A
B
HA
N
O
P
• The inverter communicates with A/C auto amp., and uses PWM control
Note
to control the motor speed via
the drive circuit.
NOTE:
• PWM (Pulse Width Modulation) is a system that controls current and voltage by changing the duty ratio of
a constant frequency pulse wave.
• PWM is used as the adjustment method of output voltage when inverter is used as a power supply for con-
trolling motor speed.
• PWM changes voltage application time (pulse width) using a semiconductor element and controls motor
speed.
• The IPM contains an internal protection circuit, and uses the inverter control circuit to monitor for an
increase in motor drive circuit temperature in order to prevent circuit overheating.
• The motor uses a DC brushless motor, with speed control performed by the inverter drive circuit.
JMIIA2059GB
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