59
WILO SE 09/2013
English
11.3 Other defaults
Other defects, not detected by the converter,
due to the pump.
WARNING!
Risk of wound!
The liquid is toxic, corrosive or dangerous for
human being.
• The qualified person in charge of the repairing
must be informed.
• Clean the pump to ensure complete safety of the
operator.
12. Spare parts
Spare parts may be ordered via local approved
technicians and/or the Wilo after-sales
service.
To avoid any questions or wrong orders, all data
of the name plate should be mentioned
when ordering.
CAUTION!
Danger of material damage!
Perfect pump function can only be guaranteed
when original spare parts are used.
• Only use original spare parts.
Subject to technical alterations!
Defaults
Possible causes
Remedies
The pump is running but no
delivery
The pump does not run quickly enough. Check the adequate adjustment of the
requirement (conformity to the setpoint).
The internal parts are obstructed by par-
ticles.
Let dismantle the pump and clean it.
Suction pipe is obstructed.
Clean the pipe.
Air in suction pipe.
Check tightness of the whole pipe up to
the pump and make it tight.
Suction pressure is too low, it causes
generally cavitation noise.
Too high losses of load on suction or
suction head is too high (check the NPSH
of the pump installed and the installa-
tion).
The pump is vibrating
Pump is loosed on its foundation.
Check and tighten completely the nuts
of the stud bolts.
Particles obstructing the pump.
Have the pump dismantled and clean it.
Difficult rotation of the pump.
Check the pump turns freely without
abnormal sticking.
No sufficient pressure for the
pump
The motor speed is not high enough.
Check if the setpoint is correctly adju-
sted.
The motor is defective.
Replace it.
Bad filling of the pump.
Open the venting device and vent until
there are no more air bubbles.
The drain-priming plug is not fully tigh-
tened.
Check it and screw it again.
The flow is irregular
The suction head (Ha) is not observed.
Study again the installation conditions
and the recommendations described in
this instruction.
The suction pipe has a lower diameter
than the one of the pump.
The suction pipe must have at least the
same diameter as the suction pump port.
The strainer and the suction pipe are
partially obstructed.
Remove and clean.
In « Constant pressure » mode, the
pressure sensor is not adequate.µ
Put a sensor with conforming pressure
scale and accuracy, see <chapter 5.3>.
In « Constant pressure » mode, the pump
does not stop if the flow is zero
The non-return valve is not tight.
Clean it or change it.
The non-return valve is not adequate.
Replace it by an adequate non-return
valve, see <chapter 5.3>.
The tank has low capacity due to the
installation.
Change it or add an other one on the
installation.
Summary of Contents for Wilo-MVIE Series
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