Installation and operating instructions Wilo-TOP-S/-SD/-Z/-D/-RL/-I 45
English
CAUTION! Risk of damage!
Depending on the operating pressure, the pump may jam when the vent
screw is open.
The necessary intake pressure must be present at the suction side of the
pump!
• Carefully push back the motor shaft with a screwdriver several times.
• After 15 to 30 seconds, screw the vent screw back in.
• Switch on the pump.
• Open the check valve again.
NOTE: Incomplete bleeding will give rise to noises in the pump. Repeat the pro-
cedure if necessary.
8.2 Rotation direction monitoring
• Direction of rotation check for 3~:
Depending on the terminal box, the direction of rotation is indicated by a light
on or in the terminal box (Fig. 4, item 1). If the direction of rotation is correct, the
light lights up green. If the direction of rotation is incorrect, the light remains
dark. To check the direction of rotation, briefly switch the pump on. If the direc-
tion of rotation is incorrect, proceed as follows:
• Electrically isolate the pump.
• Interchange 2 phases in the terminal box.
• Three-phase motor which are connected to single-phase mains using the
Steinmetz circuit can rotate in the incorrect direction if the capacitor connec-
tion is incorrect. In this case the capacitor connections W2 and V2 should be
interchanged (the dashed line in Fig. 8 a and 8 f).
Restart the pump.
The direction of rotation of the motor must correspond to the direction of rota-
tion arrow on the name plate.
8.2.1 Variable speed control
DANGER! Danger of death!
When working on the open terminal box, there is a danger of electric shock
from touching the live terminals.
• Disconnect the system from the power supply and secure it against being
switched on again.
• It is not permissible to perform a stage change-over whilst in operation.
• Only specialist personnel may perform a step change-over.
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