Installation And Operating Instructions; Assembly And Installation; Electrical Installation - Wilo -MultiVert-MVI 1-6 Serie Instrucciones De Instalación Y Funcionamiento

English
All parts in contact with the fluid, such as stage
casings, impellers, pressure casing and pump base
(12) with flanges (6) are made of chromium nickel
steel. The shaft hole through the pump casing is
sealed with an axial face seal (3). The pump and motor
shafts are linked together by a clutch (8). 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 Components supplied
• high pressure centrifugal pump
• for PN 16: 2 oval flanges (mating flanges) with
internal threads, gaskets and screws,

• Installation and Operating Instructions.

4.3 Accessories
See catalogue or data sheet

5. Assembly and Installation

• See the rating plate of the pump and the rating
plate of the motor
5.1 Installation
WARNING!
on the pipe system has been completed and that
the pipe system has been flushed out if necessary.
Dirt will damage the pump.
• Assemble the pump in a dry place free of frost.
• Assemble in a horizontal and flat position. If the
pump is positioned on an incline the bearing will
wear more quickly. Vertical operation only.
• Install the pump in an easily accessible place to
facilitate inspection and disassembly. Always
install the pump exactly perpendicular on a
sufficiently 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.
• For heavy pumps, attach a hook (Fig. 2, 12) or
an eye with adequate load-bearing capacity
vertically above the pump (for total weight of
the pump see catalogue or data sheet), so that
the pump can be attached to a crane or other
lifting gear for maintenance or repairs.
• Only use the screws provided when fitting an
oval flange on the PN 16 version as longer screws
could damage the pump base.
• The arrow on the pump casing indicates the
direction of flow.
• Fit the inlet and outlet pipes without stress.
Install bellow 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.
4
Before installing the pump, make
sure that all welding and soldering
• It is advisable to choose an inlet pipe with a
nominal width one unit higher than that of
the pump connector.
• To avoid pressure losses, the inlet pipe should be
as short as possible and should not be restricted
by bends or valves.
• A backflow preventer (Fig. 2., 4) should be fitted
in the outlet pipe.
• 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 directly to the
public drinking water mains, a backflow preventer
(Fig. 2., 4) and isolating valve (Fig. 2., 2) must also
be installed in the inlet pipe.
• 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 produced from the inlet pressure
and the zero flow level:
PN ≤ P
inlet
• To prevent the formation of air pockets and
hence high temperatures in the upper section of
the pump at low flow rates (which would damage
the axial face seal), a bypass pipe can be fitted to
the pump (Fig. 2, BP, accessories).

5.2 Electrical installation

Electrical work must be carried out by a qualified and
licensed electrician in strict compliance with local
regulations.
• 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.
Star or triangular circuit starting current: 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 supply line in
phase (U1/V1/W1 or U2/V2/W2), then the motor
safety switch should be adjusted to the value of
0.58 of the nominal motor current.
• The mains cable can be inserted to the left or the
right of the terminal box. Open the appropriate
hole by removing the moulded cover, unscrew
the PG connector and push the cable through the
PG connector.
• The supply cable must be protected against the
effects of heat and vibrations which may come
from the motor or the pump.
• Heat-resistant cable must be used if the pump is
fitted in installations in which the temperature of
the fluid pumped exceeds 90 °C.
+ P
Q = 0
WILO SE 11/2010