9. Installation -
Electrical connection │ uk
19
7. Fit on/off switch. This should be supplied
by the customer.
8. If necessary, install optional accessory
components. Refer to
catalogue
Internet for approved accessory
components.
NOTICE
Unit damage due to moisture
in the event of improperly
attached terminal box cover [3].
The terminal box cover sealing
[3] must be flush all the way
round the terminal box. Tighten
both screws to a tightening
torque of 1.0 Nm.
9. Fit terminal box cover [3].
9.3 Operation with frequency
converter
A speed controller is only permitted if fitted
with a type MFU ... frequency converter to be
supplied by the customer (
Frequency
converter operating instructions).
In this case, motor protection is provided by
the frequency converter. The output
frequency of the converter may not exceed
50 Hz. Speed control with a transformer is not
permitted.
Avoid using a motor cable which is too long if
operating with a frequency converter.
9.4 Commissioning
1. Check that all screw connections are tight.
2. Check air channel for dirt and clean if
necessary.
3. Check that connection data matches
technical data on the unit (
unit
rating
plate, instructions envelope).
4. Remove protection against switching back
on and switch on mains fuse.
5. Run function test. Check direction of
rotation and air flow and if necessary swap
the cable connections over.
6. Check and ensure that the impeller runs
quietly. It is also important that the air can
flow unhindered.
7. Switch off unit.
10. Operation
The units are switched on or off with an
optional switch.
11. Maintenance
Information
● Air must be able to flow unhindered
through the air channel.
● There must be no deposits on the impeller
blades. This can lead to imbalance and
cause damage to the motor bearings.
The following control and maintenance work
must be carried out annually:
1. Check all components for damage, e.g.
the protective grille.
2. Check that the motor, impeller and steel
wall ring fixing bolts are tight.
Check that the ball bearings are running
smoothly. Turn the impeller by hand to check
this.
