Wilo TOP-Z Instrucciones De Instalación Y Funcionamiento página 40

English
• Touching the pump can cause burns!
Depending on the pump or system operating conditions (fluid temperature),
the entire pump can get very hot.
Pumps with venting screws (visible on the motor head; Fig. 1, item 1) can be
vented, if required, as follows:
• Switch off the pump.
• Close the shut-off device on the pressure side.
• Protect electrical parts from any escaping water.
• Open venting screw (Fig. 1, item 1) carefully using a suitable tool.
CAUTION! Risk of material damage!
Depending on the operating pressure, the pump may jam when the venting
screw is open.
The necessary inlet 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 venting screw back in.
• Switch on the pump.
• Open the shut-off device again.
NOTICE! Incomplete venting will lead to noises being produced in the pump and
unit. Repeat the procedure if necessary.
8.2 Direction of rotation monitoring
• Direction of rotation monitoring for 3~:
The direction of rotation is displayed, depending on the terminal box, 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.
• Restart the pump.
The direction of rotation of the motor must correspond to the direction of rota-
tion arrow on the rating plate.
8.2.1 Variable speed control
DANGER! Risk of fatal injury!
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 and secure it against being switched
on.
• It is not permissible to perform a stage change-over whilst in operation.
• Only qualified personnel may perform a step change-over.
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WILO SE 11/2023