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e) Take the whole motor module including fans out of the
ventilation unit. To do so, use the handle on the motor module.
f)
Inspect the blades of both impellers and clean them if
necessary (see next step).
g) Clean both fan impellers carefully with a vacuum cleaner.
ä
Caution!
When cleaning the fan make sure the balancing clamps have not
been displaced or come loose.
h) Check whether the fan is still balanced by spinning one of the
two impellers. If the impellers wobble significantly (and this is
causing noise problems), the entire motor module must be
replaced.
i)
Install the motor module and ventilation unit in reverse order,
and put the ventilation unit back into operation by switching on
the power. If the unit is ceiling mounted, the wire brackets
should be refitted last (also see Ceiling mounting on page 20).
6.4. Inspecting and cleaning the bypass valve
a) Disconnect power to the ventilation unit.
b) Unlock the duct adapters using a screwdriver.
2x
c) Tilt the ventilation unit away from the wall, ceiling or floor. Then
carefully remove the unit from the wire brackets and place it on
the floor.
ä
Caution!
If the unit is ceiling mounted, be careful to avoid being hit by
swinging wire brackets when removing the ventilation unit.
d) Unscrew the screws attaching the motor module to the housing
and remove the screws.
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