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Connection of the pipes
r ≈ 2,5 * (d-2s)
5 x DN
Fig. 11: Settling section upstream and down-
stream of the pump
Final check
8
Electrical connection
54
The motors are each equipped with holes for condensation water which are sealed with a
plug at the factory (in order to guarantee that protection class IP55 is achieved). If condensa-
tion water occurs (for example, when used in air-conditioning/cooling systems), this plug
must be removed downwards so that condensation water can drain off.
CAUTION
Risk of damage due to incorrect handling!
The pump may never be used as a fixed point for the pipe.
•
The present NPSH of the system always has to be greater than the required NPSH of the
pump.
•
The forces and torques being exerted by the pipeline system on the pump flange (e.g., by
warping, thermal expansion) may not exceed the permitted forces and torques.
•
The pipes and pump must be free of mechanical stress when installed.
•
The pipes must be fixed in such a way that the pump does not have to support the weight
of the pipes.
•
The suction line is to be kept as short as possible. Lay the suction line to the pump so that
it continuously rises while the inlet falls. Avoid possible air entry points.
•
If a dirt trap in the suction line is required, its free cross-section has to be 3 – 4 times the
cross-section of the pipe.
•
For short pipes, the nominal diameters must be at least those of the pump connections.
For long pipes, determine the most economical nominal diameter in each case.
•
To avoid higher pressure losses, make adapters for larger nominal diameters with an ex-
tension angle of approx. 8.
NOTICE
Avoid flow cavitation!
• A settling section must be provided upstream and downstream of the
pump in the form of a straight pipe. The length of the settling section
must be at least 5 times the nominal diameter of the pump flange.
•
Remove the flange covers at the suction and discharge ports of the pump before attach-
ing the piping.
Check the alignment of the unit again according to the "Installation" section.
•
Tighten the foundation bolts if necessary.
•
Check all connections for correctness and function.
DANGER
Risk of fatal injury due to electrical current!
The use of a thermal overload protection is recommended!
Improper conduct when carrying out electrical work can lead to death
due to electric shock!
• Electrical connection may only be carried out by a qualified electrician
and in accordance with the applicable regulations!
• Adhere to accident prevention regulations!
• Before beginning work on the product, make sure that the pump and
drive are electrically isolated.
• Make sure that no one can turn on the power supply again before
work is completed.
• Electrical machines must always be earthed. Earthing must be appro-
priate for the drive and meet the relevant standards and regulations.
Earth terminals and fixation elements must be suitably dimensioned.
• Observe the installation and operating instructions for the accessor-
ies!
Installation and operating instructions • Wilo-VeroLine-IPL-Z, Wilo-VeroTwin-DPL-Z • Ed.01/2024-07
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