Nissan Leaf. Instruction — 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

HA-76, "Electric Compressor"

.

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

Refer to

EVC-362, "DTC Logic"

.

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

HA-75, "HEATING AND COOLING

UNIT ASSEMBLY : Evaporator"

.

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

P

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