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10. Inspection and maintenance
10.1 Inspection and maintenance
The fan must be inspected once every two years. This depends on the degree
of pollution of the air. More frequent inspection is required in the case of
extreme pollution. Examples could include extraction in institutional kitchens
or industrial processes.
• Make sure that [parts of] the ventilator not [yet] anchored and tools cannot
fall/blow off the roof or cause damage or personal injury in any other manner.
• When the ventilator is completely or partly dismantled, make sure nobody
can touch rotating parts or parts under current.
• Do not leave a [partly] dismantled fan which is connected to the power
supply, unattended.
• Make sure that parts which conduct current do not become wet.
Proceed as follows for inspection or maintenance [see exploded view in appendix].
1. Turn off the fan using the isolator switch
[4]
.
2. Remove the fan cover
[2]
.
3. Unscrew the 4 bolts
[9]
.
4. Lift the inner fan components
[5]
[motor-impeller, frame and housing]
vertically and then lay them upside down in the housing.
☞
Take care not to damage the cables and air hoses.
5. If necessary, clean the impeller
[7]
carefully using a soft brush.
☞
Do not damage or bend the impeller.
6. If the bearings are defective, replace the motor-impeller.*
7. If necessary, clean the housing
[1]
carefully using a soft brush.
8. Insert the inner components
[5]
back in place.
9. Check that the impeller
[7]
can rotate freely.
10.If necessary, clean the controls
[6]
carefully using a soft brush.
11.Check that the cables and hoses are not lying against sharp edges of the
frame or the controls.
12.Make sure the cables cannot come in contact with the impeller
[7]
.
13.Clean the air cap
[3]
in the fan cover.
14.Fix the fan cover back in place
[2]
.
15.Turn the fan back on using the isolatoin switch
[4]
and check whether it
works properly.
16.Also check whether the fan reacts properly to the regulator[s], if fitted.
*Bearings cannot be replaced. This is due to the permanent magnets in
the motor. The complete motor-impeller must then be replaced. Follow the
instructions for replacement of the motor-impeller.
11.1 Malfunction tables
Two malfunction tables have been included below. The first table is for identifi-
cation of a malfunction in an MX. It begins when a complaint is received.The
second table is intended for identification of a malfunction in an MX installation
with regulator[s]. Use this table to check the complete regulator circuit. Check
the entire installation according to the table. Follow the instructions from the
top down. Only follow those instructions which are marked in the appropriate
column.
In the first table, there are two references to the previous page. This is in order
to check the pressure transmitter. Proceed as follows:
• Make sure there is 18V [=form the controls or external] on clamp ‘18V’ and
‘GND U3’ of the sensor.
• Measure the regulating signal at the ‘Eist’ and ‘GND U3’ clamps. This must
vary if you blow carefully into the hose which measures the exterior pres-
sure. This pressure must increase upon blowing.
• Compare the measured pressure through the pressure sensor [the ‘Sensor’
value in the ‘Status’ menu] with the measured pressure through a ‘foreign’
pressure meter. Use the same pressure hoses on the two meters.
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