Safety
12 EN 04/2019
2.8 Faults
In case of a fault, immediately switch the pump off and
remove it from operation.
Have all faults repaired immediately.
Seized pump
If a pump seizes, and is switched on several times repeatedly, the
motor can be damaged. Observe the following points:
Do not switch the pump/unit on repeatedly.
Turn the motor shaft by hand. See point 6.1.3 on page 27.
Clean pump.
2.9 Preventing material damage
2.9.1 Leakage and pipe breakage
Vibrations and thermal expansion can cause pipes to break.
Install the pump/unit in a manner which reduces structure-
borne and airborne noise transmission. When doing so,
observe relevant regulations.
If the pipe forces are exceeded, leaks can occur at the screwed
connection or the pump itself.
Do not use the pump as a fixed point for the pipe line.
Connect pipes free of load and mount them elastically. Install
compensators.
If the pump leaks, the unit may not be operated and must be
disconnected from the mains power supply.
2.9.2 Dry running
If run dry, mechanical seals and synthetic parts can be destroyed
within only a few seconds.
Do not allow the pump to run dry. This also applies to
checking the rotation direction.
Purge air from pump and suction line prior to start-up.
2.9.3 Cavitation
Pipes which are too long increase resistance. This results in risk
of cavitation.
Ensure that the suction line does not leak.
Observe the maximum pipe length.
Only switch the pump on when the valve on the delivery side
is opened halfway.
Open the valve on the suction side completely.
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