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• Handling (following Fig. 1 to 5)
7.2 Installation
Two standard types (Fig. 1 and 3)
Pump in suction mode (Fig. 1)
Pump in inlet mode (Fig. 3) connected to replen-
ishment reservoir (item 9) or municipal water mains
(item 10).
• The pump must be installed in a dry, well-venti-
lated location free of frost.
CAUTION! Risk of damage to the pump!
The presence of foreign matter or impurities in
the pump housing may affect the functioning of
the product.
• We recommend carrying out all soldering and
brazing work before installing the pump.
• Rinse the circuit completely before installing and
commissioning the pump.
• Remove the blanking caps on the pump housing
before installation.
• The pump must be installed in a place easy to
reach, protected against frost and as close as
possible to the drawing point.
• To ensure access to the motor shaft and filling
plug, allow a minimum distance of at least 0.3 m
from the wall in front of the unit.
• Install the pump on a smooth and horizontal sur-
face.
• Bear in mind that the altitude of the installation
site and the water temperature may reduce the
suction capacity of the pump.
Altitude
Loss of head
0 m
0 m head
500 m
0,60 m head
1000 m
1,15 m head
1500 m
1,70 m head
2000 m
2,20 m head
2500 m
2,65 m head
3000 m
3,20 m head
NOTE: As the pump may have been tested in the
factory, there may be some residual water in the
product. We recommend rinsing the pump.
7.3 Hydraulic connections
General connection instructions
• Use flexible, braid-reinforced hose piping or rigid
piping.
• The pump must not bear the weight of the pipes
(Fig. 5).
• Seal the piping well using appropriate products.
• Limit the length of the piping and avoid all fea-
tures that cause friction loss (tapers, elbows,
buckling, etc.).
Suction connections
• The diameter of the suction pipe must never be
less than the port on the pump.
Furthermore, for pumps of the series
HiMulti 5-E 4X which have negative suction head
(HA) greater than 6 m, we recommend piping of
WILO SE 11/2016
Temperature Loss of head
20°C
0,20 m head
20°C
0,20 m head
20°C
0,20 m head
a diameter greater than the nominal diameter
(DN) of the pump in order to limit friction loss.
• In the case of negative suction head, the pump
must be the highest point of the installation and
the suction piping must always be on a rising
gradient from the extraction point to the pump,
in order to prevent air bubbles forming in the
suction pipe (Fig. 1).
• Air must not be allowed to enter the suction pip-
ing while the pump is in operation.
• Installing a suction strainer (max. cross-section
of holes: 2 mm) prevents damage to the pump
from the intake of particles.
• If the pump is installed with negative suction
head: submerge the suction strainer (min. 700
mm). Ballast the flexible hose piping if necessary.
7.4 Electrical connection
WARNING! Risk of electric shock!
Danger from electrical current must be eliminat-
ed.
• Have all electrical work carried out by a qualified
electrician only!
• Before any electrical connection is made, the
pump must be de-energised (switched off) and
protected against unauthorised restarting.
• To ensure safe installation and operation, the
unit must be earthed correctly with the earth
terminals of the power supply.
CAUTION! An error in the electrical connection
will damage the motor.
The power cable must never touch the piping
or the pump, and must be kept away from any
moisture.
• See the pump's rating plate for its electrical
characteristics (frequency, voltage, current).
• The single-phase motor of this pump has an
integrated motor protection switch.
• A damaged cable or connector must be replaced
by the corresponding part available from the
manufacturer or the manufacturer's customer
service.
8. Commissioning
8.1 Filling – venting
CAUTION! Risk of damage to the pump.
Never operate the pump dry, even briefly.
The system must be filled before starting the
pump.
Pump in inlet mode (Fig. 3)
• Close the discharge valve (item 3).
• Open the front top cover (item 5-1).
• Unscrew the filling plug slightly (item 5).
• Gradually open the suction valve (item 2) and
completely fill the pump.
• Open the discharge valve (item 3).
• Do not close the filling plug until water flows out
and all air has been released.
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