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122 Maintenance
Cleaning the door air inlets (IP54)
WARNING! Use a vacuum cleaner with an antistatic hose and nozzle, and wear a
grounding wristband. Otherwise an electrostatic charge might build up and
damage the circuit boards.
Check the dustiness of the air inlet meshes. If the dust cannot be removed by vacuum
cleaning from outside through the grating holes with a small nozzle, proceed as follows:
1. Recommendation: De-energize the fans by switching off the supply unit.
2. Remove the fasteners at the top of the grating.
3. Lift the grating and pull it away from the door.
4. Remove the air filter mat.
5. Place the new filter mat in the grating the metal wire side facing the door.
6. Reinstall the grating in reverse order.
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5
Cleaning the outlet (roof) filters (IP54)
The outlet (roof) filter in IP54 units can be accessed by pulling the grating upwards.
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