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Nissan Leaf. Manual - part 758

SYSTEM

HAC-35

< SYSTEM DESCRIPTION >

[AUTO A/C (WITH HEAT PUMP)]

HAC

• When intake air temperature sensor detects that air temperature

after passing through evaporator is 1

°C or less, A/C auto amp.

sends a request to the electric compressor for a speed of 0 rpm,

stopping compressor operation.

• When the air temperature after passing through evaporator

reaches 4

°C or more, operation of the electric compressor is

resumed.

Compressor Protection Control at Pressure Malfunction

• When the refrigerant pressure on the high-pressure side (detected by the refrigerant pressure sensor) that is

received from the VCM via EV system CAN communication is as shown below, the A/C auto amp. stops the

compressor.

- Approximately 2.65 MPa (Approximately 27.0 kg/cm

) or more

- Approximately 0.14 MPa (Approximately 1.4 kg/cm

) or less

• When the refrigerant pressure on the high-pressure side returns to the range below, the A/C auto amp.

resumes operation of the electric compressor.

- Approximately 1.55 MPa (Approximately 15.8 kg/cm

) or less

- Approximately 0.16 MPa (Approximately 1.6 kg/cm

) or more

AUTOMATIC AIR CONDITIONING SYSTEM : Door Control

INFOID:0000000010121758

SWITCH AND THEIR CONTROL FUNCTION

JSIIA1650GB

Intake door

Blower motor

Air conditioner filter

Evaporator

Upper air mix door

Lower air mix door

JMIIA2747ZZ

HAC-36

< SYSTEM DESCRIPTION >

[AUTO A/C (WITH HEAT PUMP)]

SYSTEM

AIR DISTRIBUTION

inner condenser

PTC heater core

Foot door

Side ventilator door

Sub-defroster door

Center ventilator/defroster door

Fresh air

Recirculation air

Discharge air

Defroster

Center ventilator

Side ventilator

Foot

Rear foot

Switch position

Door position

Mode door

Air mix door

Cent

er v

tilat

or/d

ros

ter

doo

b- de

fros

tila

r do

r ai

ix do

r ai

ix do

AUTO switch

AUTO

MODE switch

VENT

—

B/L

FOOT

D/F

DEF switch

Intake switch

REC

—

FRE

Temperature control
switch

Full cold

16.0

°C

—

16.5

°C – 29.5°C

AUTO

Full hot

30.0

°C

ON/OFF switch

OFF

Fixed at the position where the ON/

OFF switch is pressed

—

Discharge air flow

MODE/DEF setting

potion

Air outlet/distribution (Approx.)

Ventilator

Foot

Defroster

Center

Side

Front

Rear

50%

—

30%

28%

12%

—

15%

45%

20%

—

15%

32%

13%

40%

—

15%

—

85%

SYSTEM

HAC-37

< SYSTEM DESCRIPTION >

[AUTO A/C (WITH HEAT PUMP)]

HAC

AUTOMATIC AIR CONDITIONING SYSTEM : PTC Heater Control

INFOID:0000000010121759

DESCRIPTION

• Based on the air mix door position and signals input from each sensor, the A/C auto amp. calculates the

PTC heater outlet air temperature.

• A/C auto amp. calculates the PTC heater operating rate so that the calculated PTC heater outlet air temper-

ature is achieved, and transmits the PTC heater operating rate request signal to the PTC heater via LIN

communication.

• Based on the A/C auto amplifier command, the control circuit inside the PTC heater controls the PTC heater

output by the PWM method.

NOTE:

If the difference between setting temperature and in-vehicle temperature is large and the A/C heater load is

high when the HEAT is ON (HEAT switch indicator lamp: ON) and A/C is OFF (A/C switch indicator lamp:

OFF), the heater control mode of the refrigerant cycle also operates. In addition, if the difference between set-

ting temperature and in-vehicle temperature is small and the A/C heater load is low, the PTC heater does not

operate. (Outlet air is warmed by the heater control mode of the refrigerant cycle.)

A/C UNIT CASE PROTECTION CONTROL

• The A/C auto amp. performs protection control for preventing the A/C unit case from being damaged by the

high temperature of the A/C unit case, due to PTC heater operation.

• A/C auto amp. detects the A/C unit case temperature around the PTC heater core with the A/C unit case

temperature sensor.

• When the temperature measured by the A/C unit case temperature sensor becomes 108

°C or more during

PTC heater operation, the A/C auto amplifier stops PTC heater operation.

• When the temperature measured by the A/C unit case temperature sensor becomes 105

°C or less, the A/C

auto amp. resumes PTC heater operation stopped by protection control.

AUTOMATIC AIR CONDITIONING SYSTEM : ECO Mode Control

INFOID:0000000010121760

DESCRIPTION

• When ECO mode is selected with the electric shift selector, VCM transmits the ECO mode request signal to

the A/C auto amp.

• When the A/C auto amp. receives the ECO mode request signal, it performs control that reduces the power

consumption of the A/C system.

ECO MODE CONTROL

• When ECO mode is selected, warm-up/cool-down control (refer to

HAC-34, "AUTOMATIC AIR CONDITION-

ING SYSTEM : Electric Power Distribution Control"

) is cancelled and the special ECO mode power distribu-

tion control is performed.

• The A/C auto amp. determines the A/C system power consumption based on the ambient temperature and

set temperature.

NOTE:

When ECO mode control is activated, there is a noticeable decrease in A/C capacity when temperatures are

hot or cold.

AUTOMATIC AIR CONDITIONING SYSTEM : Heat Pump System Control

INFOID:0000000010121761

DESCRIPTION

• The heat pump system is a system that controls the refrigerant cycle.

• Based on the input signals, the A/C auto amp. transmits a refrigerant cycle control mode request signal to

the heat pump control unit.

• The following control modes are available for the refrigerant cycle of heat pump system.

- Cooler (dehumidified) control

- Heater control

- Deice control

NOTE:

For details of refrigerant cycle, refer to

HA-21, "REFRIGERATION SYSTEM : System Description"

• Compared to the A/C status, the control status of refrigerant cycle control mode, refrigerant channel switch-

ing 2 way type valve and refrigerant channel switching 3 way type valve is controlled as per the following.

HAC-38

< SYSTEM DESCRIPTION >

[AUTO A/C (WITH HEAT PUMP)]

SYSTEM

NOTE:

When the refrigerant cycle is not operating [HEAT switch OFF (HEAT switch indicator lamp: OFF) and A/C

switch OFF (A/C switch indicator lamp: OFF)], the status of refrigerant channel switching 2 way type valve

and refrigerant channel switching 3 way type valve becomes valve non-control status and the refrigerant

cycle becomes cooling (dehumidified) control mode.

• If the power switch is turned OFF during heater control mode, the heat pump control unit switches to the

cooling (dehumidified) control mode within 60 seconds after the power switch is turned OFF.

DEICE CONTROL

• Deice control is the function that deices frost when it forms on the condenser.

• A/C auto amp. transmits a deicing request signal to VCM when, according to the input of each sensor, it is

judged that frost is formed on the condenser.

• During normal charge mode or rapid charge mode, VCM turns the A/C relay ON and transmits deice permis-

sion signal (permission).

NOTE:

• Deice control does not operate during timer A/C operation or remote A/C operation.

• If the charge mode is completed due to full charge or timer charge completion while the deice control is

operating, deice control continues.

• The charge status indicator 3 blinks while deice control operates after charge completion.

• If the charge connector is disconnected from the charge port or the A/C switch is pressed after the power

switch is turned ON, VCM sends a deice permission signal (prohibition) and stops deice control operation.

• When the deice permission signal (permission) is received, the A/C auto amp. transmits a refrigerant cycle

control mode request signal (deice control) to the heat pump control unit and drives the electric compressor.

(for a maximum of 20 minutes)

• The heat pump control unit controls the refrigerant channel switching 2 way type valve and refrigerant chan-

nel switching 3 way type valve and operates the refrigerant cycle in the deice control mode, according to the

refrigerant cycle control mode request signal.

• After the deicer control mode operation of the refrigerant cycle is completed, in order to remove frost or

water drops remaining on condenser, the A/C auto amplifier transmits a cooling fan request speed signal

(duty rate: 40%) to VCM for 1 minute and operates the cooling fan.

AUTOMATIC AIR CONDITIONING SYSTEM : A/C-Heater Timer (Climate Ctrl. Timer)

INFOID:0000000010121762

DESCRIPTION

• When the A/C-Heater Timer (Climate Ctrl. Timer) is set on the navigation screen, AV control unit transmits a

A/C-heater timer setting time signal (departure time and date settings set on the navigation screen) to VCM

via CAN communication.

• When the timer/remote A/C temperature is set on the navigation screen, the timer/remote setting tempera-

ture signal (timer/remote A/C temperature set on the navigation screen) is transmitted from VCM via CAN

communication. VCM then transfers the signal to A/C auto amp. via EV CAN communication. Then, the set-

ting temperature is stored in A/C auto amp.

• When the operation time calculated by the A/C auto amp. has been reached, VCM starts the A/C auto amp.

and starts A/C-Heater Timer.

VCM activates 2 hours before the A/C-Heater Timer setting time. Then, it requests the A/C auto amp. to cal-

culate the necessary A/C operating time for achieving the stored setting temperature.

• Based on the ambient temperature detected by the ambient sensor, the A/C auto amp. calculates necessary

A/C operating time and transmits a timer A/C operation time signal to VCM via EV CAN communication.

A/C status

Refrigerant cycle control mode

Refrigerant channel

switching 2 way type valve

Refrigerant channel

switching 3 way type valve

A/C ON (A/C switch indicator lamp: ON) Cooler (dehumidified) control

OFF

HEAT ON (HEAT switch indicator lamp:
ON) and A/C OFF (A/C switch indicator
lamp: OFF)

Heater control

During deice control operation

Deice control

OFF

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