Wilo MultiPress-MP 3 Série Notice De Montage Et De Mise En Service page 13

installed with the drain valve at least 20 mm above the floor.
– Isolating valves (1) should be installed in front of and behind the
pump, so that the pump can be easily changed and/or maintenance
work can be carried out more easily.
– A backflow preventer (2) should be installed immediately behind the
outlet pressure gland of the pump.
– The inlet and outlet pipes should be connected to the pump without
stress. Flexible lengths of pipe or bellow expansion joints of
restricted length can be used to ensure a low-vibration connection.
The weight of the pipework must be supported.
– The customer should take suitable measures to prevent low water
levels and hence guard against the pump running dry in order to
protect the axial face seal. The WILO range comprises various
accessories which can be used for this purpose.
– The customer should protect the pump at the inlet pipe with a
strainer (1 mm mesh) or filter connection (5) to avoid the pipe
being damaged by any dirt which may be sucked in.
5.2 Electrical installation
– Electrical work must be carried out by a qualified and
licensed electrician in strict compliance with local regu-
lations.
– The electricity supply must be connected via a rigid supply cable
fitted with a coupler or an all-pole switch with a contact gap of at
least 3 mm in accordance with the local regulations in force (e.g. in
accordance with the latest edition of IEE wiring regulations).
– Check the mains current and voltage.
– Ensure compliance with the data on the pump rating plate.
– Make sure the pump is earthed.
– Mains fuse: 10A time-lag fuse.
– The customer should fit three phase current motors with a motor
safety switch which should be adjusted to the nominal current given
on the rating plate to prevent the motor from overheating.
Single phase motors are fitted with a thermal motor cut-out in the
factory. This cuts off the pump when the permissible temperature of
the motor coil is exceeded and switches it back on again automati-
cally once it has cooled down.
– A supply cable with an adequate ample external diameter (e.g. H 05
VV-F 3/4 G 1.5) should be used to protect against damp and to
secure the mains lead cleat of the stuffing box.
– Connection to the mains must be carried out in accordance with the
plan of terminal connections for three phase or single phase current
in the terminal box of the pump (see also Fig. 4).
– The supply cable must be laid in such a way that it never touches
the pipework and/or the pump and motor casing.
If necessary a fault current breaker (FI-switch) should be
provided.
5.3 Operation with frequency converter
The speed of the pump can be controlled when connected to a
frequency converter. Speed control limits: 40%n
See Installation and Operating Instructions of the frequency converter
for connection and operation.
To avoid overloading the motor coil to the extent that it is damaged
and to avoid increasing noise levels, the frequency converter must not
produce speeds due to increased voltage of over 500 V/µs and spikes
of û > 650 V. If such speeds due to increased voltage are possible, an
LC filter (motor filter) should be installed between the frequency
converter and the motor. The layout of the filter must be designed by
the manufacturer of the frequency converter or filter.
In control devices with frequency converters supplied by WILO, the
filter is already installed.
6. Commissioning
– Check that there is a sufficient level of water in the reservoir and/or
– Checking direction of rotation (only for three phase current motors):
– Only for three phase current motors: Adjust the motor cut-out to the
– If available, position float switches or electrodes for protection
– Open the isolating valve at the inlet, open the vent screw (Figs 1 & 2,
7. Maintenance
– The pump is almost maintenance free.
– During the running-in period, there may be some dripping from the
– Increased bearing noise and unusual vibrations indicate a worn
– Before carrying out any maintenance work, switch off the pump and
– When the pump is exposed to frost or is out of service for a long
≤ n ≤ 100%n .
nom nom
Figures
1 Cross-section of the pump with reference numbers.
2. Positioning and pipework of the pump.
3. Drawing showing dimensions.
4. Plan of electrical connections.
check the inlet pressure.
The pump must not run dry, as this would destroy
WARNING!
the axial face seal.
Check that the pump rotates in the 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 pump terminal box.
nominal current given on the rating plate.
against low water levels in such a way that the pump cuts out if the
water level is so low that air would begin to be sucked in.
3, SW 19) until the pumped fluid comes out, close the vent screw,
open the isolating valve at the outlet and switch on the pump.
– Depending on the fluid temperature and the system pres-
sure, if the vent screw is completely loosened hot liquid or
gas can escape or even shoot out at high pressure.
Beware of scalding.
– Depending on the operating conditions of the pump or
installation (fluid temperature), the entire pump may be-
come very hot.
Avoid touching the pipe owing to the risk of burning.
The pump must not run for longer than 10 minutes
WARNING!
with a flow rate of Q = 0 m
when running continuously the pump should be
kept at a minimal flow of 10 % nominal flow.
The Life expactancy will differ dependent on the operating conditions.
We recommend a 1/2 yearly visual control for leakage and out of
ordanary vibration.
axial face seal. Should a more significant leak occur as a result of
substantial wear, have the axial face seal replaced by a specialist.
bearing. In this case, have the bearing replaced by a specialist.
ensure that it cannot be switched on again by unauthorized people.
Never carry out work on a running pump.
period, the pump and pipework must be emptied in the cold
season. Empty the pump by releasing the drain valve (Figs 1 & 2, 4),
ENGLISH
3 /h. We recommend that
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