11
039073 • V
ers
ion
1.
0 • 05
.03.
2007
How to service fans and fan motors
Interval
Fan and motor are serviced in accordance with the following intervals:
4 times annually
:
•
Belt drive
Once annually
:
•
Fan wheel
•
Vibration dampers and flexible connections
Warning!
Do not forget to disconnect all current to the unit and the unit parts before service.
Illustrations
Belt-driven fans
Direct-driven fans
Plug fans
Procedure
Do as follows to service the fan:
Step
Action
1
Check and clean, if necessary, the fan wheels for dust that may cause
unbalance and vibrations. If necessary, replace the bearings
2
Steps 2-4 only apply to belt-driven fans!
Check the belt drive for wear and tear and replace the belts if necessary.
NB: If one belt of a belt drive is worn, all belts of the belt drive are to be re-
placed! Do not use new and used belts together, as they are of different lengths
Continued overleaf
