10Pressure Reducer (Accessory); Electrical Connection; Commissioning / Decommissioning; General Preparations And Checking - Wilo SiBoost-Smart-2 Helix V605 Notice De Montage Et De Mise En Service

7.2.10 Pressure reducer (accessory)
The use of a pressure reducer is necessary if the
pressure fluctuations in the inlet pipe are more
than 1 bar or if the supply pressure fluctuations
are so great that the system has to be switched off
or the total pressure (supply pressure and pump
head at the zero volume point - see the system
pump curve) exceeds the rated pressure. The
pressure reducer can only perform its function if
there is a minimum pressure gradient of approx. 5
m or 0.5 bar. The pressure downstream of the
pressure reducer (back-pressure) is the basis for
the total head calculation of the pressure boosting
system. When installing a pressure reducer, there
should be an installation section of approximately
600 mm on the supply pressure side.

7.3 Electrical connection

DANGER! Risk of fatal accident!
The electrical connection must be made accord-
ing to the local regulations (VDE regulations) by
an electrical installation engineer approved by
local energy supply companies.
Pressure boosting systems of the SiBoost Smart
ALTI NEXIS series are equipped with control
devices of the SC, SC-FC or SCe series. To make
the electrical connection, the corresponding
installation and operating instructions and
attached electrical wiring diagrams must be
observed. General points to be considered are
listed below:
• the current type and voltage of the mains connec-
tion must comply with the details on the rating
plate and wiring diagram of the control device
• the electrical connection cable must be ade-
quately dimensioned for the total power of the
pressure boosting system (see rating plate and
data sheet),
• external protection must be provided according to
DIN 57100/VDE 0100 Part 430 and Part 523 (see
data sheet and wiring diagrams),
• as a protective measure, the pressure boosting
system must be earthed according to regulations
(i.e. according to the local regulations and circum-
stances); the connections intended for this pur-
pose are identified accordingly (see also the wiring
diagram).
DANGER! Risk of fatal injury!
As protective measures against dangerous con-
tact voltages:
• if the pressure boosting system is without a fre-
quency converter (SC) a residual-current-oper-
ated protection switch (FI switch) with a trigger
current of 30 mA must be installed, or
• if the pressure boosting system is fitted with a
frequency converter (SC-FC or SCe), a univer-
sal-current-sensitive residual-current-oper-
ated protection switch with a trigger current of
300 mA must be installed,
• the protection class of the system and of the
individual components are indicated by the rat-
ing plates and/or data sheets,
Installation and operating instructions Wilo-SiBoost Smart (FC) ... Helix V/... Helix VE/... Helix EXCEL
• further measures/settings, etc. are described in
the installation and operating instructions and
also the wiring diagram of the control device.

8 Commissioning / decommissioning

We recommend that the initial commissioning of
the system is performed by Wilo customer service.
Contact your dealer, the nearest Wilo representa-
tive or contact our central customer service
department directly for details.

8.1 General preparations and checking

• Before switching on for the first time, check that
all on-site wiring has been done correctly, partic-
ularly the earthing
• Check that the pipes are not under stress,
• Fill the system and visually check for leaks,
• Open the check valves on the pumps and in the
suction pipe and pressure pipe,
• Open the pump venting screws and slowly fill the
pumps with water so that the air can escape com-
pletely.
CAUTION! Risk of damage to property!
Do not allow the pump to run dry. Dry-running
destroys the mechanical seal and leads to motor
overloading.
• In suction mode (i.e. negative level difference
between break tank and pumps), the pump and
the suction line must be filled via the opening in
the venting screw (use a funnel as required).
• If a diaphragm pressure vessel (optional or acces-
sory) is installed, this should be checked to ensure
the supply pressure is correctly set (see Fig. 3 and
4)
• To do this:
• depressurise the vessel on the water side (close
the flow-through fixture (A, Fig. 3) and allow the
residual water to drain (B, Fig. 3),
• check the gas pressure at the air valve (top;
remove protective cap) on the diaphragm pres-
sure vessel using an air pressure gauge (C, Fig.
3). If necessary correct the pressure if it is too
low [(PN2 = pump start-up pressure pmin less
0.2-0.5 bar or the value given in the table on the
vessel) (see also Fig. 5)] by adding nitrogen
(contact (Wilo customer service).
• If the pressure is too high, release nitrogen at
the valve until the value required is reached.
• Refit the protective cap,
• Close the drain valve on the throughflow valve
and open the throughflow valve.
• For system pressures > PN16, the manufacturer's
filling instructions according to the installation
and operating instructions must be observed for
the diaphragm pressure vessel,
DANGER! Risk of fatal injury!
Excessive supply pressure (nitrogen) in the dia-
phragm pressure vessel can lead to damage or
destruction of the vessel and thereby also to
personal injury.
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