Wilo TOP-S Instrucciones De Instalación Y Funcionamiento página 46

English
10 Faults, causes and remedies
Have faults remedied by qualified personnel only! Observe the safety
instructions in chapter 9!
Fault
The system is noisy.
Pump is making
noises.
The pump power is too
low.
42
Cause
Air in the system.
The flow rate at the pump
is too high.
The pump delivery head is
too high.
Cavitation due to insuffi-
cient supply pressure.
Foreign bodies in the
pump housing or impeller.
Air within the pump.
The check valves in the
system are not fully open.
Foreign bodies in the
pump housing or impeller.
Incorrect flow direction.
The check valves in the
system are not fully open.
Incorrect direction of
rotation.
(only for 3~) terminal box type 6/7:
Indicator light off
Remedy
Vent the system.
Reduce the pump power by
switching to a lower speed.
Reduce the pump power by
switching to a lower speed.
Check pressure stability / supply
pressure and if necessary increase
them within the permissible range.
After dismantling the motor impel-
ler unit, remove the foreign body.
Vent the pump/system.
Fully open the check valves.
After dismantling the motor impel-
ler unit, remove the foreign body.
Interchange the pressure side and
suction side of the pump. Refer to
the direction symbol on the pump
housing or pump flange.
Fully open the check valves.
Correct the electrical connections
in the terminal box:
Refer to the direction of rotation
arrow on the rating plate
Interchange two phases at the
mains supply terminals.
WILO SE 08/2020