Wilo MultiVert MVI 16 Series, Installation And Operating Instructions Manual

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11
ENGLISH
– 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
Assembly should only take place once all welding
and soldering work and the rinsing of the pipe net-
work 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
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.
– 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.
– 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 electri-
cian. Current national regulations must be observed (e.g.
VDE regulations in Germany).
WARNING!
– 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 triangu-
lar 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 termi-
nal 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.
– When using the pump in machinery where the water temperature
exceeds 90 °C, a connecting pipe with corresponding heat
resistance must be used.
– Connections to the mains must be carried out in accordance with
the plan of terminal connections for rotary or alternating current in
the terminal box of the pump (Fig. 4).
– The terminal box can be better positioned by rotating the motor
through steps of 90°. To this end the connecting screws (Fig. 1,
Pos. 1) of the lantern (Fig. 1, Pos. 8) and motor flange are to be
loosened.
In the case of internal connecting screws the clutch guard (Fig. 1,
Pos. 2) is to be removed beforehand. When assembling the clutch
guard, do not forget to tighten the safety screw.
5.3 Operation with frequency converter
The speed of the pump can be controlled when connected to a
frequency converter.
See Installation and Operating Instructions of the frequency converter
for connection and operation.
The frequency converter may not generate a speed due to increased
voltage greater than 2500 V/µs and voltage peaks û > 1000 V, as
otherwise the motor coil will be destroyed. If such speeds due to the
increased voltage are possible, an LC filter (motor filter) should be
installed between the frequency converter and the motor.
6 Commissioning
In order to protect the axial face seal, the pump
must not run dry.
– Close both isolating valves and open the vent screw (Fig. 2, 5) by
one and a half or two turns.
– Slowly open the isolating valve (Fig. 2, 2) at the inlet until the air has
escaped from the vent screw and the fluid to be pumped comes
out. The escaping air will be clearly heard hissing. Tighten the vent
screw.
– Slowly open the isolating valve at the outlet (Fig. 2, 3). The mano-
meter installed at the outlet should be checked for any possible
pressure instabilities, indicated by a flickering manometer pointer. If
the pressure is unstable, allow more air to escape.
When the temperature of the liquid being pumped is high
and the system is pressurised, any flow escaping from the
vent screw can cause scalding and injuries. The vent
screw should therefore be loosen only slightly.
– When used for the first time, if it is to be used to pump drinking
water the system must be flushed through, so that any dirty water
present will not contaminate the drinking water supply.
– Checking the direction of rotation (only for rotary current motors):
Check that the pump rotates in the same direction indicated by the
arrow on the pump casing by switching on for a short time. If this is
not the case, interchange 2 phases in the terminal box.
WARNING!