Installation and operating instructions Wilo-TOP-Z 39
English
CAUTION! Risk of material damage!
If for maintenance or repair work the motor head is detached from the pump
housing, the O-ring located between the motor head and pump housing must
be replaced with a new one. Care must be taken to position the O-ring cor-
rectly when installing the motor head.
• To release the motor, undo the 4 internal hexagon head screws.
CAUTION! Risk of material damage!
Do not damage the O-ring located between the motor head and the pump
housing. The O-ring must lie in the angled end of the bearing plate that faces
the impeller, and must not be twisted.
• After the installation, tighten the 4 internal hexagon head screws again
crosswise.
• For the commissioning of the pump, see section 8.
10 Faults, causes and remedies
Have faults remedied by qualified personnel only!
Observe the safety instructions in section 9!
Fault Cause Remedies
The system is making
noises.
Air in the system. Vent the system.
The flow rate at the pump
is too high.
Reduce the pump power by
switching to a lower speed.
The pump delivery head is
too high.
Reduce the pump power by
switching to a lower speed.
Pump is making
noises.
Cavitation due to insuffi-
cient inlet pressure.
Check pressure stability / supply
pressure and, if necessary, increase
them within the permissible range.
Foreign bodies in the
pump housing or impeller.
After dismantling the motor impel-
ler unit, remove the foreign body.
Air within the pump. Vent the pump/system.
The shut-off devices in
the system are not fully
open.
Fully open the shut-off devices.
The pump power is too
low.
Foreign bodies in the
pump housing or impeller.
After dismantling the motor impel-
ler unit, remove the foreign body.
Incorrect flow direction. Interchange the pressure side and
suction side of the pump. Refer to
the direction of flow symbol on the
pump housing or pump flange.
The shut-off devices in
the system are not fully
open.
Fully open the shut-off devices.
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