Spare Parts - Wilo Sub TWU 4 Plug Betriebsanleitung

English
10 Faults, causes and remedies
Only have faults remedied by qualified personnel.
Follow the safety instructions under Maintenance.
Faults
Pump does not start
Pump runs but does not pump
The flow rate is too low.
Pump starts up too often.
Pump does not stop.
If the operating fault cannot be remedied,
please contact the trade or your nearest Wilo
customer service office or agent.

11 Spare parts

Spare parts can be ordered via the local trade and/
or the Wilo customer service office.
If you have any queries, and to avoid incorrect
orders, please quote all the data on the name plate
on each order.
We reserve the right to make technical changes!
18
Causes
Wrong voltage or voltage drop
Interruption of the connecting cable
The motor protection switch has tripped.
Pump starts too frequently.
Electronics in the Fluid control defective.
No water or water level too low
The intake filter is blocked.
Wrong direction of rotation (DM version)
Too little difference between switch-on and
switch-off pressure.
Electrodes are incorrectly installed.
The diaphragm expansion tank is too small
or the supply pressure is incorrect.
The pressure gauge displays incorrect pres-
sure valves after adjustment.
Leaks within the installation
Water loss greater than 0.6 l/min.
Fluid control flow monitor is blocked by
sand.
Electronics in the Fluid control defective.
The pressure switch switch-off pressure has
been set too high.
Remedy
Check the voltage on starting. If the cable
cross-section is too small, this can lead to a
voltage drop and the pump will not start.
Measure the phase resistances, pull up the
pump and check the cable.
Check the protection switch setting of the
trip current intensity and compare this with
the nominal current absorbed.
Reduce starting processes, risk of overheat-
ing of the motor (approx. 1 min.).
Replace Fluid control
• Check the water level, guarantee mini-
mum 0.20 m above the intake socket.
• Vent the pump
Pull up the pump and clean the filter.
Change over two phases in the connection
box.
Increase the difference between the
switch-on and the switch-off pressure.
Adjust the distance between the electrodes
so that a corresponding time lag is guaran-
teed between the stationary mode and
operating mode of the pump.
Check and adjust the pressure (switch on
and switch off). Check the tank supply pres-
sure. Replace the diaphragm expansion tank
with a bigger one or add another one.
Check whether the socket on the pressure
gauge is set to the highest position. If nec-
essary, correct the position and make the
pressure adjustments again.
Check the installation / tap connections for
leaks and seal if necessary.
Check installation
Remove Fluid control from the installation
and flush out against the direction of flow.
Replace the Fluid control.
Check and correct the switch-off pressure.
WILO AG 01/2008