14
KSB
Air duct temperature increases, r25°C and continues to grow
After the timer stops, the motor switches to the high speed 100%. After the speed switch the timer starts
5 minutes countdown.
Thus, in the timer delay pattern the delay timer activates each time the fan speed changes.
TECHNICAL MAINTENANCE
Disconnect the fan from power mains prior to any maintenance and repair operations. Make sure the
rotating parts do not move.
Maintenance means regular cleaning of the fan surfaces of dirt and dust.
The impeller blades require thorough cleaning every 6 months. Clean the blades as follows:
Disconnect the fan from power supply.
Wipe the exterior surfaces of the fan casing, Fig. 7.1.
Undo the screws and remove the casing bottom panel, Fig. 7.2 and 7.3.
Clean the impeller blades using a soft brush or a vacuum cleaner, Fig. 7.4.
Protect the motor and circuit board from water ingress. Blade cleaning must be performed with care so as
not to displace the balancing weights of the impeller.
Perform all the above operations in the reverse order after cleaning.
Fig. 7
1.
2.
3.
4.
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