211934 VEF Inst&Operation MUL 20180913

GB Maintenance
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13
6 Maintenance
6.1 Important
Danger
• Switch power off (all-pole circuit breaker) before servicing or maintenance, and make sure the impeller
has come to standstill.
• Make sure that the mains supply to the unit is disconnected before performing any maintenance or
electrical work!
• Do not remove, short-circuit or disconnect safety accessories (i.e. motor protection, safety grille).
• Fan impeller has come to a complete standstill.
• Should the supply cable be damaged, it must be replaced by the manufacturer, its service agent or
similarly qualified persons in order to avoid a hazard
• The unit is heavy. Be careful during transport and installation. Risk of injury through pinching. Use
protective clothing.
• Do not lift the fans by the connecting cable, connection box, motor bracket, impeller or inlet cone.
6.2 Maintenance intervals
The fan should be cleaned when necessary, at least once a year to avoid imbalance and unnecessary damage to the
bearings. The fan bearings are maintenance free and should only be replaced if damaged. Do not use a high-pressure
cleaner (steam jet) when cleaning the fan. Ensure that the fan impeller's balance weights are not moved or the fan im-
peller distorted. Listen for abnormal operating noise.
6.3 Cleaning the fan
Warning
• Make sure that the mains supply to the unit is disconnected before performing any maintenance or
electrical work!
• Fan impeller has come to a complete standstill.
• The unit is heavy. Make sure that the motor bracket attach to the lock to prevent the motor to fall down
during maintenance.
Danger
• Make sure that the motor does not fall down.
Caution
• Beware of sharp edges during maintenance, use protective gloves. Risk of injury through pinching.
• The fans can have sharp edges and corners which may cause injuries. Be careful when opening the fans,
the motor assembled on the motor bracket is relatively heavy.
211877 | A006