Page 1 of 3

Air conditioning switch

Auto air conditioning switch

Figure 1
Air conditioning switch

A. Front side
B. Back side

1 Display window 6 Indoor/outdoor selection switch

2 Temperature and display item select 7 Fan speed selection switch
switch
3 Trouble check switch 8 Power OFF switch
4 Compressor ON/OFF switch 9 Auto/Manual mode selection switch
5 Air flow selection switch

Connector
Connector 111 (12 Connector 112-1 (16
pins) pins) Connector 112-2 (12 pins)
No Description No Description No Description
1 Compressor 1 - 1 Receiver drier pressure
ON/OFF switch
2 Fan speed step 4 2 - 2 Ambient temperature
sensor
3 Fan speed step 3 3 Face open 3 Ambient temperature
sensor
4 Battery +24 V 4 Left foot1/4 open 4 Start switch (ACC)
5 Actuator +24 V 5 Left foot open 5 CAB auxiliary heater
timer
6 Relay +24 V 6 Right foot 1/2 open 6 Air mix door position

http://localhost:5011/prosis/40/EX8/GB/VHB/m56136437.xml 12/10/2007
 Page 2 of 3

sensor ground
7 Fan speed step 2 7 Indoor air 7 Air mix door position
sensor (signal)
8 Fan speed step 1 8 - 8 Water temperature
sensor
9 Illumination 9 Face close 9 Incar temperature sensor
10 Ground earth 10 Face 1/2 open 10 Air mix door driver - warm
air
11 Battery ground 11 Left foot close 11 Air mix door driver - cool
air
12 Actuator ground 12 Left foot 1/2 open 12 Air mix door position
13 Right foot close sensor (+5 V)
14 Right foot open
15 Outdoor air
16 -

Functions of the air conditioning switches

1. Display window
A. Auto mode
The auto mode displays the value of the setting temperature.
When the trouble check switch is pressed and then the temperature & display
item selection switch pressed, the display window shows the value of the
ambient and setting temperature, and if the air conditioning system is faulty the
error code value shows repeatedly.
B. Manual mode
The manual mode is used when operator requires.
According to the operation of the temperature and the display item selecting,
the switch displays the value as a C4, C3, C2, C1, H0, H1, H2, H3 and H4.
When the trouble check switch is pressed and then the temperature & display
item selection switch pressed, the display window shows the value of the
ambient and setting temperature, and if the air conditioning system is faulty the
error code value shows repeatedly.
C. Emergency mode
This displays when the air conditioning system is faulty.

Fault code
No Error code System check Fault cause
1 E1 Incar temperature sensor Abnomal input
2 E2 Ambient temperature sensor Abnomal input
3 E3 Air mix door position sensor Abnomal input
4 E4 Water temperature sensor Abnomal input
5 E5 Duct temperature sensor Abnomal input
6 E6 Mix driver Abnormal operation of mix
actuator
2. Temperature and display item select switch
A. Temperature selection mode

http://localhost:5011/prosis/40/EX8/GB/VHB/m56136437.xml 12/10/2007
 Page 3 of 3

Auto mode
The setting temperature in cab can control at 16 ~ 32 °C (61 ~ 90 °F).
When setting temperature is set at 16 °C, temperatue select mode
operates to maximum cooling condition (air flow 4 steps, face door
control) and when setting temperature is set at 32 °C, temperatue select
mode operates to maximum heating condition (air flow 4 steps, direction -
foot).

Manual mode
C1 to H4 can be adjusted.
- C1 ~ C4: cooling mode - H1 ~ H4: heating mode - H0: intermediate
mode

Emergency mode
1 to 9 can be adjusted.
- 1 ~ 4: cooling mode - 6 ~ 9: heating mode
- 5: intermediate mode
B. Display selection mode
When the trouble check switch is pressed the ambient temperature, setting
temperature and error code are shown repeatedly.
3. Trouble check switch
The switch is used to display the operator’s mode and the service mode. The switch
should be pressed at least 5 seconds to shift to the service mode.
4. Compressor ON/OFF switch
This switch is used to turn the compressor ON/OFF, when the power switch is ON.
This switch locates at ON or OFF position automatically in the auto mode.
5. Air flow selection switch
This switch can select the power modes of ventilation.
6. Indoor/outdoor selection switch
Indoor or outdoor air can be selected.
When indoor air, the indicator light is ON.
Indoor air: 90% of indoor air + 10% of outdoor air
Outdoor air: 50% of outdoor air + 50% of indoor air
7. Fan speed selection switch
This switch can select the four fan speed steps.
Auto mode: can be selected automatically.
Manual mode: to be changed by operator.
8. Power OFF switch
This switch is used to turn off the air conditioning unit.
9. Auto / Manual selection switch

Auto mode
Indicating lamp is "ON".

Manual mode
Indicating lamp is "OFF".

http://localhost:5011/prosis/40/EX8/GB/VHB/m56136437.xml 12/10/2007