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• Low-water protection:
– WMS kit for direct connection to the supply
pipe,
– WAEK 65 float switch with small switching unit
(only for EM version),
– WA 65 float switch,
– SK 277 with 3 dipped electrodes,
• WVA pressure switch,
• Wilo fluid control (EK),
• Installation switching:
– WA 065 float switch
– WA OEK 65 float switch with small switching
unit (only for EM version).
5. Assembly and Installation
5.1 Installation
Fig. 2 shows a typical pump installation. Instal-
lation and assembly instructions, which must be
observed with this type of operation, are listed as
follows:
• Before installing the pump, make sure that all
welding and soldering on the pipe system has
been completed and that the pipe system has
been completely flushed out. Foreign bodies and
dirt will damage the pump.
• Install the pump in a dry place free of frost.
• Leave room for maintenance work to be carried out.
• The motor ventilator inlet must be kept clear, at
least 0.30 m from the wall to the rear.
• Install in a horizontal and flat position.
• The pump must be held in place with two 8 mm
diameter screws, on a vibration-absorbing base.
Commercially available rubber-metal connectors
can also be used to hold it in place and absorb
vibra tions.
• To ensure that the drain valve can be accessed,
the pump must be 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 connec-
tion. 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 (1mm mesh) or filter
connection (5) to avoid the pipe being damaged
by any dirt which may be sucked in.
WILO SE 04/2016
5.2 Electrical installation
Electrical work must be carried out by a qualified and
licensed electrician in strict compliance with local
regulations.
• 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 rotary 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.
AC 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
automatically once it has cooled down.
• A supply cable with an adequate ample exter-
nal diameter (e.g. 05 VV-F 3/5 G 1.5 or AVMH-I
3/5x1.5) 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 rotary or alternating current in the terminal
box of the pump (see also Fig. 4).
• Heat-resistant cable must be used if the pump is
fitted in installa tions in which the temperature of
the fluids pumped exceeds 90 °C.
• 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 fil-
ter 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.
≤ n ≤ 100%n
.
nom
nom
English
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