Pipe Connection; Electrical Connection; Operation With Frequency Converter - Wilo Multivert MVIS Notice De Montage Et De Mise En Service

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NOTICE: As all pumps have their hydraulic output
tested at the factory, there may be some residual
water in the pump. For reasons of hygiene, it is
recommended that the pump is flushed each
time before being used for drinking water.
- The dimensions for installation and connections
are described in section 5.2.
WARNING! Risk of tipping over!
When purchasing the pump, particular attention
should be paid to the fact that, for the larger
versions, a higher centre of gravity poses several
risks during pump operation.
- The installation surface must be horizontal and
flat. Any slanting of the pump results in prema-
ture wear.
- Place insulating material (cork or reinforced
rubber) under the pump to prevent noise pollu-
tion and the transfer of vibration to the system.
- Only the provided screws may be used for the
installation of the oval flange. Longer screws
can damage the pump housing.
7.3

Pipe connection

- Connect the pump to the pipes using suitable
counter flanges, bolts, nuts and gaskets.
CAUTION!
The nut tightening torques must not exceed the
following values:
Do not use impact wrenches.
- The arrow on the pump housing shows the direc-
tion of flow of the fluid.
- During installation of the suction line and the
pressure pipe, make sure that the pump is not
under tension. The pipes must be attached so
that their weight is not borne by the pump.
- The pump must be equipped with stop valves on
the suction side and on the pressure side.
- The use of compensators can lessen the devel-
opment of pump noise and vibration.
- The diameter of the pipe must be at least as
large as the diameter of the pump's suction port.
- The pressure pipe can be equipped with a
non-return valve to protect the pump from the
effects of fluid hammer.
- If the pump is directly connected to a public
drinking water network, the suction line must
be equipped with a non-return valve and a stop
valve.
18
M10 = 20 Nm
M12 = 30 Nm
- If the pump is indirectly connected to a public
drinking water network via a diaphragm pressure
vessel, the suction line must be equipped with a
non-return valve and a suction strainer to pre-
vent contaminants from entering the pump.
7.4

Electrical connection

DANGER! Risk of electric shock!
Improper electrical connection can lead to fatal
electrical shocks.
• Electrical connection must only be carried out by
an electrician who is approved by the local ener-
gy supply company and in accordance with the
applicable local regulations.
• The pump must be voltage-free before electri-
cal connection and secured against unintended
reactivation.
• To ensure safe installation and operational relia-
bility, the pump must be earthed correctly with
the earth terminals of the power supply.
- It must be ensured that the rated current, voltage
and frequency correspond to those on the motor
rating plate.
- The pump must be connected to the mains by a
cable which has a plug or a main switch.
- Three-phase motors must be connected to an
approved protection system. The rated current
must correspond to what is stated on the motor
rating plate.
- The connection cable must be routed so that it
never comes into contact with the pipe system
and/or pump housing and the motor housing.
- The pump/system must be earthed in accordance
with the local regulations. The use of a residu-
al-current device offers additional protection.
- Connection to the mains must be in accordance
with the connection diagram (Fig. 4).
- The motor has a connection for PTC sensors.
7.5

Operation with frequency converter

- The electric motors fitted to the pumps can be
connected to a frequency converter to adjust
pump output to the duty point.
- The converter must not create overvoltages at
the motor terminals of more than 650 V for a
motor of 3~ 400 V or 375 V for a motor
of 3~ 230 V and no dU/dt voltage fluctuations
of more than 2500 V/µs may arise.
- A suitable filter must be used for higher values.
Consult the manufacturer of the frequency con-
verter on how to determine and select the filter.
- The FC manufacturer's installation and operating
instructions must be observed precisely.
WILO SE 01/2020