Zehnder VDA EExe Mode D'emploi page 21

Take care!! Before starting on any
maintenance work, the roof extract fan
must be disconnected from the mains
voltage.
Dismantle the mounting plates(6) by
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unscrewing the bolts(5);
Remove the top cover of the roof
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extract fan(7) and the protective grille(1);
Check that the impeller and the base
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are not dirty;
When cleaning any components, take
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care not to damage the protective layer.
Take care!! The roof extract fan must
not be sprayed with water or with a high
pressure cleaner.
Dismantle the power cable of the motor
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from the connection box or switch;
Dismantle the roof extract fan cover(3)
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by pulling the hood up and at the same
time pushing out the clamp springs(2);
Dismantle the mounting plate(9) by
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unscrewing the bolts(8);
When cleaning the parts, make sure not
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to damage the antistatic coating.
Take note! Do not place with the impeller
on the ground!
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Dismantle the carrier plate of the
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impeller(14) by unscrewing the bolts(15);
Take the impeller off the hub of the
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motor;
Put everything back in the reverse
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order.
Take note! The marking on the impeller
must be located facing the key way of
the motor shaft, as this is the position in
which the impeller is balanced.
Check: The anti-static coating must not
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be damaged or come loose from the fan
housing;
Check whether the impeller moves
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freely;
Turn on the fan briefly to check which
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way the impeller turns;
Check the impeller to ensure it is
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balanced;
Check the bearings of the motor.
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Take note! Carefully read the maintenance
instructions in the supplied instruction
manuals of the branching box, operating
switch and motor.
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EN - 21