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R I S K O F E L E C T R I C S H O C K
Risk of death from electric shock!
▶ Any electrical works must be carried out by qualifi ed
electricians only.
▶ Observe the IEC 30364 (DIN VDE 0100) and for
potentially explosive areas the IEC 60079 (DIN VDE
0165) standard.
WA R N I N G
Risk of injuries caused by vacuum or harmful media to be
pumped and operating liquid!
▶ Use protective equipment when carrying out any works
on the aggregate.
C AU T I O N
Risk of material damage caused by dry running!
▶ Make sure the aggregate has been properly fi lled.
C AU T I O N
Risk of cavitation when throttling down the suction fl ow!
Risk of cavitation when the fi tting in the suction pipe is
closed!
▶ Completely open the suction-side fi tting and do not use
it for controlling the fl ow rate.
▶ Open the pressure-side fi tting.
C AU T I O N
Risk of material damage caused by a closed pressure pipe!
▶ Do not operate the aggregate when the pressure-side
fi tting is closed.
▶ Observe the max.permissible operating limits
(→ Operating limits, page 28).
− max.permissible pressure diff erence
− max.permissible compression pressure
− max.permissible operating liquid temperature
− max.permissible operating liquid viscosity
− max.permissible operating liquid density
− max.permissible temperature of the medium to be
pumped
1. Open the pressure-side fi tting.
2. Ventilation port (if available): open the fi tting.
3. Switch on the motor.
4. Operating liquid: open the fi tting.
5. Open the suction-side fi tting.
6. Ventilation port (if available): close the fi tting as soon as
the motor has reached its nominal speed.
7. Provide for a smooth running behaviour of the
aggregate.
8. Check the aggregate and connections for tightness.
6.2.2 Switch-off
Risk of injuries caused by vacuum or harmful media to be
pumped and operating liquid!
▶ Use protective equipment when carrying out any works
on the aggregate.
1. Close the fi tting at the operating liquid side.
2. Switch off the motor.
3. Ventilation port (if available): open the fi tting.
4. Check all connecting screws and tighten if required
(only aft er initial commissioning).
Risk of material damage resulting from vacuum
condition!
▶ Aerate the aggregate during switch-off .
▶ Do not leave the aggregate under vacuum.
If the aggregate is not aerated, the mechanical seals will
be subject to damage.
6.3 Setting the operating liquid fl ow rate
6.3.1 Continuous-fl ow cooling
▶ Switch on the aggregate.
▶ Set the pressure in the operating liquid pipe to max. 0.2
bar overpressure (→ Diagram Fig. 9)
Fig. 9 Continuous-fl ow cooling
18
255548 Rev.1
WA R N I N G
C AU T I O N
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