Nissan Leaf. Instruction — part 807
SYSTEM
HAC-231
< SYSTEM DESCRIPTION >
[AUTO A/C (WITHOUT HEAT PUMP)]
C
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When the blower fan motor is activated by the AUTO control, voltage
to blower fan motor increases gradually and then the amount of air
flow increases gradually. (Approximately 138 seconds for air flow to
reach HI from LOW)
STARTING AIR FLOW CONTROL AT HIGH INTERIOR AIR TEMPERATURE
When evaporator temperature is high [intake air temperature sensor value is 35
°C (95°F) or more], to prevent
a hot discharged air flow, A/C auto amp. suspends blower motor activation for approximately three seconds so
that evaporator is cooled by refrigerant.
AIR FLOW CONTROL AT MODE DOOR MOTOR OPERATION
If the mode motor starts when the air flow corresponds to a voltage of 8.6 V or more applied to the blower fan
motor, the A/C auto amp. performs control that fixes the voltage applied to the blower fan motor at 8.5 V, tem-
porarily decreasing the air flow and ensuring that the mode door operates smoothly.
MANUAL AIR FLOW CONTROL
When the fan switch is operated, automatic control is cancelled and the desired fan speed (1 – 7) can be
selected.
AUTOMATIC AIR CONDITIONING SYSTEM : Air Inlet Control
INFOID:0000000010121945
• Instruction control by the REC switch and FRE switch is given priority for inlet selection.
• When the DEF switch is pressed, the inlet is fixed at fresh air intake.
• During automatic inlet control, when the electric compressor is ON and the ambient temperature is high, the
intake is fixed at recirculation.
• When the A/C system is OFF, the inlet is fixed at fresh air intake.
• During automatic inlet control when the ambient temperature is except above, the A/C auto amp. changes
the intake control status according to the ambient temperature and the operating status of the electric com-
pressor, discharge air flow, and outlet operating status.
JSIIA1775GB
Voltage applied to blower fan motor (V)
Mode switch
VENT, B/L
FOOT, D/F
DEF
Fan speed
(When instruction
control is selected)
1st
4.0
4.0
4.0
2nd
5.4
5.2
5.3
3rd
6.8
6.3
6.7
4th
8.3
7.5
8.0
5th
9.7
8.7
9.3
6th
11.1
9.8
10.7
7th
12.5
11.0
12.5
HAC-232
< SYSTEM DESCRIPTION >
[AUTO A/C (WITHOUT HEAT PUMP)]
SYSTEM
AUTOMATIC AIR CONDITIONING SYSTEM : Electric Power Distribution Control
INFOID:0000000010121946
DESCRIPTION
• Based on the vehicle status, battery remaining energy, and other factors, VCM calculates the electrical
power needed to operate the A/C system, and sends this value to the A/C auto amp. via EV CAN communi-
cation.
• Based on the ambient sensor signal, inlet position, outlet position, target air mix door position, and other
information, the A/C auto amp. calculates the electrical power used by the electric compressor and PTC ele-
ment heater. If the total exceeds the electric power consumption permitted by the VCM, then the operating
rate of the electric compressor and PTC element heater are reduced to lower the power consumption.
WARM-UP AND COOL-DOWN CONTROL
For the first 10 minutes after the power switch is turned ON, heating/cooling operation at maximum capacity is
possible based on a judgment by the A/C auto amp. (however this does not occur in ECO mode).
AUTOMATIC AIR CONDITIONING SYSTEM : Compressor Control
INFOID:0000000010121947
DESCRIPTION
• If the conditions for electric compressor operation are met while the blower fan motor is operating, then
based on the various input signals, the A/C auto amp. calculates the compressor target speed that produces
the target temperature (4–12
°C) for the evaporator outlet temperature, and sends a speed command to the
electric compressor via a communications signal.
Compressor
Mode switch
Ambient temperature (temperature detected by ambient sensor)
14
°C or less
15
°C or more
ON
VENT
B/L
30% recirculation
Control according to the target air mix door position
FOOT
D/F
Fresh air intake
OFF
VENT
B/L
30% recirculation
Fresh air intake
FOOT
D/F
Fresh air intake
JMIIA0711GB
SYSTEM
HAC-233
< SYSTEM DESCRIPTION >
[AUTO A/C (WITHOUT HEAT PUMP)]
C
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• The electric compressor receives the A/C auto amp. command and controls the motor speed by means of its
built-in inverter circuit, then transmits this status by communications.
Evaporator Protection Control
• 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
2
) or more
- Approximately 0.14 MPa (Approximately 1.4 kg/cm
2
) 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
2
) or less
- Approximately 0.16 MPa (Approximately 1.6 kg/cm
2
) or more
AUTOMATIC AIR CONDITIONING SYSTEM : Door Control
INFOID:0000000010121948
SWITCH AND THEIR CONTROL FUNCTION
JSIIA1649GB
JSIIA1650GB
HAC-234
< SYSTEM DESCRIPTION >
[AUTO A/C (WITHOUT HEAT PUMP)]
SYSTEM
Intake door
Blower motor
Air conditioner filter
Evaporator
Upper air mix door
Lower air mix door
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
In
ta
ke
do
or
Air mix door
Ce
nt
er v
en
tilat
or/d
efro
st
er d
oo
r
Su
b- de
fros
te
r
do
or
Si
de
v
ent
ila
to
r do
or
Fo
ot
do
or
Up
pe
r ai
r mi
x do
or
Lo
we
r ai
r mi
x do
or
AUTO switch
ON
AUTO
ALIIA0791ZZ
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