Filling And Venting - Wilo TOP-S Instrucciones De Instalación Y Funcionamiento

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For noise reduction, it is recommended that sine filters (LC filters) are used
rather than du/dt filters (RC filters).
The following limit values should be complied with:
• Rate of voltage rise du/dt <500 V/μs
• Voltage spikes û < 650 V
The following limit values at the connection terminals of the pump must not be
exceeded:
• U
min
• f = 30 Hz
min
At low output frequencies from the frequency converter, the direction of rota-
tion indicator light at the pump may go out.
8 Commissioning
WARNING! Risk of injury and damage to property!
Commissioning the pump without the sealing screw including the flat gasket
is not permissible, since escaping fluid can cause damage!
Prior to commissioning the pump, check that it was installed and connected
correctly.

8.1 Filling and venting

Prime and vent the unit correctly. Venting the pump rotor compartment is car-
ried out automatically after a short operating period. Dry running for short peri-
ods will not harm the pump.
WARNING! Risk of injury and damage to property!
It is not permitted to remove the motor head, differential pressure screw
(fig. 3 item 3) or the flange connection / threaded pipe union for the purpose
of venting the system!
• There is a risk of scalding!
Escaping fluid can lead to injuries to persons and damage to the product.
When the venting screw is opened, hot fluid may escape at high pressure in
liquid of vapour form.
• Touching the pump can cause burns!
Depending on the operating status of the pump or unit (fluid temperature),
the entire pump can become very hot.
Pumps with venting screws (visible on 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.
38
= 150 V
WILO SE 08/2020