Cod. 985719 – 00 / July 2004
14
5. MAINTENANCE
Maintenance of the fan equipment should only be carried out by skilled and adequately trained staff.
To ensure complete safety do not start any maintenance procedure or inspection without disconnecting the unit from the
power supply and before the fan and motor have completely stopped rotating
.
Close any inlet or outlet damper to avoid a rotation of the impeller due to induced airflow.
For Atex fans, do not begin any maintenance operation in an explosive atmosphere.
During the first two working hours:
After the initial installation the fan should be observed during the following two hours to ensure no excessive vibrations,
abnormal noises, excessive absorbed power. If necessary, adjust belt tensioning to compensate the initial tension
decrease.
After the first 24 working hours:
Run the following operations:
• check and, if necessary, re-align the pulleys and re-tension the belts
• check the correct tightening of the screws (see the table below)
• check the locking of the bearings on the shaft
• check that the impeller can move freely and that it does not come in contact with the inlet cone, or that it doesn't
move along the shaft
In the first working hours, it is normal that a certain amount of grease could come out of the bearings.
Max tightening torque for screws (Nm)
Type
Size
8,8 10,9 12,9
M4
3,2 4,5 5,2
M5
68,511
M6
11 14,5 17,5
M8
25 36 43
M10
49 70 85
5.1. ORDINARY MAINTENANCE
To guarantee smooth operation, the fan must be serviced regularly.
As a general rule, complying with the operation limits and the standard working conditions, the most important
maintenance measures, to be made at least twice a year, are:
• checking vibration and sound level; anomalous values indicate a problem on the unit
• checking the presence of corrosion on the fan, especially on the rotating parts, to prevent breakings
• cleaning of the fan, in particular of the impeller, to avoid dust deposits which can create unbalance of the impeller
and reduction in bearing life, vibrations and noise
Some components or versions can require most frequent maintenance. In the following paragraphs are listed the
maintenance operations for these critical parts.
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