Pressure Reducer (Accessories); Electrical Connection - Wilo SiBoost Smart Série Notice De Montage Et De Mise En Service

The flexible connection pipes in the system must
be accessible for inspection at any time and must
therefore not be covered by the pipe insulation.
Nominal diameter,
Connection
DN 40
DN 50
DN 65
Table 2
NOTICE!
Flexible connection pipes are subject to wear in
operation. Regular checks for leakages or other
defects are necessary (see recommendations of
DIN 1988).

7.2.10 Pressure reducer (accessories)

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 flow point – see the system pump
characteristic 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-boost-
ing system. When installing a pressure reducer,
there should be an installation section of approxi-
mately 600 mm on the supply pressure side.

7.3 Electrical connection

DANGER! Risk of fatal injury!
The electrical connection must be established in
compliance with the local regulations (VDE reg-
ulations) by an electrical installation engineer
approved by the local energy supply company.
Pressure-boosting systems in the SiBoost Smart
series are equipped with control devices in the SC,
SC-FC or SCe series. To make the electrical con-
nection, the corresponding installation and oper-
ating instructions and attached electrical wiring
diagrams must be observed. General points to be
considered are listed in the following:
• the current type and voltage of the mains connec-
tion must comply with the details on the rating
plate and circuit 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),
Installation and operating instructions Wilo-SiBoost Smart (FC) ... Helix V/... Helix VE/... Helix EXCEL
Thread Conical
Screwed connection Male thread
Rp 1½"
Rp 2"
Rp 2½"
Max. bend radius
RB in mm
R 1½" 260
R 2" 300
R 2½" 370
• 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 circuit
diagram).
DANGER! Risk of fatal injury!
As a protective measure against dangerous con-
tact voltages:
• if the pressure-boosting system is without a
frequency converter (SC) a residual-current
device (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 device
with a trigger current of 300 mA must be
installed,
• the protection class of the system and of the
individual components can be taken from the
rating plates and/or data sheets,
• further measures/settings, etc. are described in
the installation and operating instructions and
also the circuit diagram of the control device.
English
Max. bend angle
BW in °
60
50
40
19