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5. Start of operation
Perform the below steps every time the fans have been stopped.
5.1 Before start-up
Check the fans and installation location in accordance to the below checklist and correct and
improve as necessary. See also the checklists in the appendices.
Checklist
• Safe operation
• Transport rods
Novenco ZerAx axial fan types AZL-AZN-AZW – Installation and maintenance
Fans fitted with frequency converters must have the control unit set up, before start of
operation. Refer to the Novenco document "Configuration of frequency converters for
Novenco fans".
The blade clearance must be minimum
0.1x motor shaft diameter (min. 2 mm,
max. 13 mm) all around the rotor
circumference.
The axial distance between the rotor hub
and stator must be min. 3.5 mm.
Wire guards should be mounted on the
inlet and outlet sides.
Fans on support frames and with
vibration dampers have transport rods in
the support frames, which must be
removed before start of operation. The
handles are marked with a strong colour.
• Clean ducts
The fans and duct connections must be
clean and free from tools and objects that
can affect the airflow.
• Electrical connections
The electrical connections must be
correct and in accordance to the
prescribed requirements. Switch the fan
power briefly On, then Off, to check the
rotational direction of the rotor.
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