Assembly/Installation; Electrical Connection - Wilo MultiVert MVI 16 Série Notice De Montage Et De Mise En Service

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single shaft (11). The pressure casing (5) guarantees
a fail-safe seal.
All parts that come into contact with the medium,
such as stage hous-ings, impellers and pressure
casings are made of chromium nickel steel, the
pump footplate (Pos. 12) with flanges (Pos. 6) of
coatedGG 25 (up to 85°C) or of chromium nickel
steel (on request). The shaft hole through the pump
casing is sealed with an axial face seal (3).
"Spacer" feature allows not to disassemble motor
on MVI32C, MVI52C, MVI70 and MVI95 when
removing mechanical seal cartridge.
The pump and motor shafts are linked together
by a clutch (9). All parts of the drinking water
version (version E) which are in contact with the
fluid have been cleared by KTW and WRAS and are
therefore suitable for use with drinking water.
The speed of the pump can be controlled when con-
nected to a frequency converter (see paragraph 5.3).
4.2 Products delivered
• High pressure centrifugal pump
• Installation and operating instructions
4.3 Accessories
see catalogue or data sheet

5. Assembly/installation

• See the rating plate of the pump and the rating
plate of the motor
5.1 Assembly
WARNING!
work and the rinsing of the pipe network has been
completed. Dirt will damage the pump.
• Install the pump in a dry place free of frost.
• Install in a horizontal and flat position. If the
pump is positioned on an incline the bearing will
wear more quickly.
• Install the pump in an easily accessible place to
facilitate inspection and disassembly. Always
install the pump exactly perpendicular on a suffi-
ciently heavy concrete base (Fig. 2, 3). Fit a vibration
absorber between the base and the floor.
• Dimensions for installation and connections are
given in Paragraph 1.2.1, Table 2 and in Fig. 3.
• In the case of heavy pumps fit a hook (Fig. 2, Pos.
12) or eye with a suitable load-bearing capacity
(total weight of pump: see catalogue/ data sheet)
vertically above the pump, to which a hoist or
similar device can be attached when maintaining
or repairing the pump. Allow for a free size when
completed of min. 200 mm.
4
MVI32C, MVI52C, MVI70 and MVI95
are equipped with a cartridge system in
order to ease standard mechanical seal
replacement without disassembling
the hydraulic parts.
Assembly should only take place
once all welding and soldering
For an easier and safer installa-
tion, a dedicated handling tool is
available
4091365) for biggest pumps
(MVI32C, MVI52C, MVI70 and
MVI95). Please contact your re-
seller for more information.
• The arrow on the pump casing indicates the
direction of flow.
• Fit the inlet and outlet pipes without stress.
Install below expansion joints of restricted length
to absorb vibrations. The pipes must be attached
(Fig. 2, 7) in such a way that the pump does not
bear the weight of the pipes.
• Isolation mechanisms (Fig. 2, 2 & 3) must in
principle be installed in front of and behind
the pump to avoid having to empty and refill the
whole installation when inspecting or changing
the pump.
• To avoid pressure loss it is recommended that you
choose as short an inlet pipe as possible, choose a
nominal width for the suction pipe which is larger
by a nominal width than the pump connection
and avoid constrictions caused by bends and valves.
• A backflow preventer (Fig. 2, 4) should be fitted
in the outlet pipe.
• For differential pressures > 6 bar the backflow
preventer (Fig. 2, Pos. 4) is to be fitted in the
suction pipe. It is not required at the outlet.
• The axial face seal should be protected against
dry running. An inlet pressure gauge or level
gauge should be installed by the customer.
• If the pump is to be connected indirectly via a
reservoir, a suction strainer (Fig. 2, 8) must be
provided in the inlet pipe by the customer to
prevent coarse impurities entering the pump.
• With limited nominal pressure PN, ensure that
this pressure is pro-duced from the inlet pressure
and the zero flow level:
P Inlet ≤ PN - P max pump
• For gaseous or hot pumping media a bypass pipe
is to be fitted to the pump (Fig. 2, Pos. BP),
(accessory).

5.2 Electrical connection

Electrical connection should be made by a qualified
electrician. Current national regulations must be
observed (e.g. VDE regulations in Germany).
• Check that the mains current and voltage comply
with the data on the rating plate.
• Pump/installation must be earthed in compliance
with regulations.
• All motors must be fitted with a motor safety
switch by the customer to prevent the motor
from overheating.
Adjusting the motor safety switch:
Direct starting current: Adjust to nominal current
of the motor in accordance with the data on the
motor rating plate.
Y- -start: If the motor safety switch is connected
as a star or triangular safety circuit combination at
the supply line it can be adjusted in the same way
units operating on direct starting current. If the
motor safety switch is connected to the motor
(article number
WILO SE 11/2010