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Consult the operating and maintenance manual
for the switchgear for more detailed information
regarding the control process.
The pumps alternate on each activation so as to
balance their operating time.
7 Installation and connections
7.1 Delivery and installation
Unwrap the product and remove the packaging
while ensuring respect for the environment.
Install the pressure-boosting system in an easily
accessible room which is well ventilated and is
insulated against frost. Access routes to the room
must be kept clear of obstructions.
The pressure-boosting system's design enables
floor-mounted installation on a flat concrete sur-
face. As the baseplate is placed on height-adjust-
able vibration absorbers, the installation is already
equipped with insulation against sound transmis-
sion.
If the system is to be further fixed to the ground
on-site, appropriate measures must be taken to
prevent the transmission of sound through such
structures.
7.2 Electrical connection
WARNING! Risk of electric shock!
Electrical connection must be performed by an
electrician approved by the local energy supplier
and in accordance with the valid local regula-
tions.
When making the electrical connection, it is cru-
cial that the corresponding Installation and oper-
ating instructions and the circuit diagram supplied
with the switchgear are referred to accordingly.
In general, the following aspects must be
observed:
• the mains connection voltage must correspond to
the characteristics detailed on the rating plate and
the wiring diagram for the control device,
• the electrical connecting cable for the switchgear
must be correctly dimensioned in terms of the
total power of the pressure-boosting system (see
the rating plate and the technical data),
• the pressure-boosting system must be earthed in
according with regulations (i.e. in accordance with
local regulations and conditions); the connections
for this purpose are marked accordingly (see also
the wiring diagram).
NOTICE:
Do not forget to connect the baseplate of the
pressure-boosting system to the ground where
the system is installed.
Connection for the float switch (Version "B")
The float switch, supplied separately, must be
installed in the replenishment reservoir and must
be connected to the switchgear by a cable with
two conductors.
18
7.3 Hydraulic connection
The water supply to the pressure-boosting sys-
tem may be taken from the municipal water sup-
ply (version "V") or from a replenishment reservoir
(version "B").
The connection diameter of the collecting spaces
is 1"1/4.
The suction and discharge manifolds can be con-
nected either to the left or the right. The openings
that are not used are then blocked using the plugs
supplied.
Before connecting the pressure-boosting system,
fit valves to the two manifolds to isolate them
when performing work on the system.
When connecting the flow switch, on the flow
switch side, the following criteria must be
observed:
• Pipework must run horizontally
• The flow switch must be oriented in the direction
of fluid flow
• The flow switch sensor must be positioned verti-
cally
CAUTION!
• If the pressure-boosting system is connected to
a pressurised municipal water supply, ensure
that the system can withstand the maximum
pump pressure at zero flow rate plus the pres-
sure of the municipal water supply. If this is not
the case, a pressure reducer must be fitted to
the output of the pressure-boosting system.
• We strongly recommend installation of a differ-
ential pressure control device on the water inlet
pipe to avoid pressure fluctuations at the input
to the pressure-boosting system.
If the pressure-boosting system is in suction
mode in a replenishment reservoir, the friction
losses must not exceed the pumps' maximum
suction capacity.
It is advisable to use a foot valve with piping of
equal or greater dimensions than the nominal
diameter of piping on the suction side.
The system must always be equipped with a pres-
sure tank.
8 Commissioning/decommissioning
We recommend that you arrange for initial com-
missioning of your pressure-boosting system to
be conducted by your closest Wilo customer ser-
vice agent or simply contact our central customer
service.
8.1 General preparations and control measures
• Prior to initial commissioning, check the wiring
installed by the customer, in particular the earth
connection.
• Check the source of the water supply (sufficiently
full replenishment reservoir or appropriate munic-
ipal water supply).
• Fill the system and ensure its impermeability by
conducting a visual inspection;
• Open the gate valves on the pumps and in the
suction and discharge pipes.
WILO SE 11/2019
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