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12. REPAIR, MAINTENANCE AND WITHDRAWAL FROM SERVICE
The applied rolling bearings of the fan do not require a periodical lubrication. However, it is
recommended to check periodically a condition of the motor bearings (the rotor of the fan should
rotate freely without excessive backlashes and knocks).
When the noise level of the unit operation is increased it is necessary to check up the correctness of
fastenings of the fan and the whole unit.
The rotor blades should be cleaned with a damp cloth after removing the protective net not to allow
unbalancing the rotor.
Do not use high pressure washers to clean the fan.
In case of any disturbances in the unit operation it is necessary to contact with the installer or the
service.
All repair and maintenance works should be executed when voltage is off. The unit
should be protected against an accidental activation by other persons as well.
The heater dust contamination state should be checked up periodically. In case of excessive dust
accumulation the heater should be blown through with compressed air.
The excessive heater contamination reduces the heating power and air efficiency of the
unit.
After withdrawal from service the unit should be passed over to the specialized collection point of
recyclable materials.
