Wilo TOP-Z Serie Instrucciones De Instalación Y Funcionamiento página 43

Pumps with venting screws (visible on the motor head, fig. 1, item 1) can be
vented as follows if required:
• Switch off the pump.
• Close the check valve on the pressure side.
• Protect electrical parts from any escaping water.
• Carefully open the venting screw (fig. 1, item 1) using a suitable tool.
CAUTION! Risk of damage to property!
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 check valve again.
NOTE! Incomplete venting will result in noises in the pump and unit. Repeat the
procedure if necessary.
8.2 Rotation direction monitoring
• Rotation direction monitoring 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.
• 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 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 stage change-over.
Installation and operating instructions Wilo-TOP-Z
English
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