Evaluation Unit AVL 4000
4-12 Service Manual
4.2.1.16 Fan
The machine is ventilated at the sides and also at the rear to keep the pneumatic pump
cool. The angle of the air flow near the display has been kept as small as possible to
prevent the screen from becoming dirty too quickly.
The fan speed depends on the temperature.
4.3 Dismantling the 4-/5-Gas Measuring Instruments
Unit
• Disconnect the plug from the mains!
• Open the housing cover (3 screws on the sides of the evaluation unit). Push the cover
towards the back until it is released from the mounting clamps.
• Disconnect all cables from the main board, power supply unit and ignition board to
the rear panel.
• Remove the 4 fixing screws on the rear panel.
• Remove the 3 fixing screws on the base plate.
• Remove the solenoid valve from the rear panel.
• Disconnect the hoses to the pneumatics module.
• Remove the rear panel pulling towards the back. Remove the activated carbon filter
from the rear panel.
• Disconnect the mains wiring to the power supply unit of the measuring instruments
unit.
• Carefully lift the measuring instruments unit upwards.
• The measuring instruments unit can now be completely removed.
For a technical description of the measuring instruments unit, see section 5 4-/5-Gas
Measuring Instruments Unit.
4.4 Housing
Components
− Cover
− Lower shell
− Front panel, complete (including keypad and display)
− Front panel (without electronic components)
− Rear panel, complete
− Rear panel (with no devices)
− 4 rubber feet
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