NA 03.28 D
EN - 12
Aligning the pulleys
by placing a ruler flat against the pulley flange and adhering to the data below.
for variable-diameter pulleys, align them along the centre line.
- Hold the pulleys in place with the appropriate tool,
- Fit the belts,
- Tension the belts as instructed in the previous section.
If changes are made to the drive, make sure that it is compatible with the fan motor assembly, motor current and the suspensions.
Direction of rotation of the impellers
Option: device to measure and check the air flow. Used on centrifugal fans and plug fans.
Centrifugal fan
Low pressure
Centrifugal fan
Moderate pressure
Plug fan
Seen from intake side
D
max < 0.5°
E
max < 4 mm per metre of centre distance
Alignment axis
