Spare Parts - Wilo Sub TWU 4 Notice De Montage Et De Mise En Service

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.
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!
14
Causes
Wrong voltage or voltage drop
Interruption of the connecting cable
The motor protection switch has tripped.
Pump starts too frequently.
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.
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.).
• 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.
WILO AG 01/2008