Components Of The Pressure Boosting System; Function Of The Pressure Boosting System - Wilo SiBoost Smart Einbau- Und Betriebsanleitung

6.2 Components of the pressure boosting system

The complete system is made up of various main
components. The scope of delivery includes sepa-
rate installation and operating instructions for the
operating parts/components. (Also see attached
installation plan)
Mechanical and hydraulic system components
(Fig. 1a, 1b and 1c) :
The compact unit is mounted on a base frame
with vibration absorbers (3). It consists of a
group of 2 to 4 high-pressure multistage centrif-
ugal pumps (1), which are combined by means of
an intake manifold pipe (4) and a delivery mani-
fold pipe (5) to form a complete system. Each
pump is fitted with a (6) check valve on the intake
side, a (7) check valve on the pressure side and a
non-return valve (8) on the pressure side. A mod-
ule with isolation valves is fitted on the pressure
manifold, which contains a pressure sensor (12)
and pressure gauge (11) (see also Fig. 2a and 2b).
For systems with pumps of the Helix V and Helix
VE series, an optional 8-litre diaphragm pressure
vessel (9) with a throughflow valve (10) (for
throughflow according to DIN 4807-part 5) (see
also Fig. 3) can be fitted to the pressure mani-
fold (5). For systems with pumps of the Helix
EXCEL series an optional retrofit kit with an 8-litre
diaphragm pressure vessel is available (see Fig. 5).
An optional module for low-water cut-out
switchgear (WMS) (14) can be fitted or retrofit-
ted to the intake manifold (see Fig. 6a and 6b).
The control device (2) is mounted directly on the
base frame and ready-wired to the electrical com-
ponents of the system. In the case of larger sys-
tems, the control device is accommodated in a
separate free-standing cabinet (SG) and the elec-
trical components are pre-wired to the corre-
sponding connecting cable. For the separate free-
standing cabinet (SG), the final wiring is done by
the customer (see section 7.3 and the documen-
tation included with the control device).
The present installation and operating instruc-
tions contain only a general description of the
complete system.
Systems with pumps of the Helix EXCEL series
are equipped additionally with a casing (Fig. 1c,
15a and 15b) around the valves and joint tubing.
High-pressure multistage centrifugal pumps (1):
Different types of multistage high pressure cen-
trifugal pumps are installed in the pressure boost-
ing system depending on the application and the
performance parameters required. Their number
can vary from 2 to 4 pumps. Pumps with built-in
frequency convert-in frequency converters
(Helix V ) are used. The attached installation and
operating instructions provide information on the
pumps.
Installation and operating instructions Wilo-SiBoost Smart (FC) ... Helix V/... Helix VE/... Helix EXCEL
Control device (2):
The SC series control device is used to control and
regulate the Siboost-Smart pressure boosting
system. The size and components of the control
device may vary depending on the design and per-
formance parameters of the pumps. The attached
installation and operating instructions, and the
corresponding wiring diagram provide information
on the control device installed in this pressure
boosting system.
Diaphragm pressure vessel kit (Fig. 3 with
optional retrofitted accessory to Fig. 5):
• Diaphragm pressure vessel (9) with throughflow
valve (10)
Pressure sensor kit (Fig. 2a and 2b):
• Pressure gauge (11)
• Pressure sensor (12)
• Electrical connection for pressure sensor (12)
• Draining / venting (16)
• Stop valve (17)

6.3 Function of the pressure boosting system

Wilo pressure boosting systems of the series
SiBoost-Smart are fitted as standard with non-
self-priming multistage high-pressure centrifugal
pumps with or without built-in frequency con-
verters. These are supplied with water via the inlet
manifold pipe.
Where self-priming pumps are used for special
versions, or generally in the case of suction from
lower-lying tanks, a separate vacuum-proof and
pressure-resistant suction line with a foot valve
must be installed for each pump. The line must rise
continuously from the tank to the system.
The pumps increase the pressure and pump the
water to the consumer via the delivery manifold
pipe. To do this, they are switched on and off or
controlled depending on the pressure. The pres-
sure sensor continuously measures the actual
pressure value, converts it into a current signal and
transmits it to the control device.
Depending on the requirement and the type of
control, the control device switches the pumps on,
switches them in, or switches them off. If pumps
with built-in frequency converters are used, the
speed of one or more of the pumps is changed
until the control parameter settings are achieved
(a more precise description of the control mode
and the control process is given in the installation
and operating instructions for the control device).
The total delivery volume of the system is distrib-
uted over several pumps. This has the big advan-
tage that the system output is adapted very
precisely to the actual demand and the pumps are
operated in the most favourable performance
range in each case. This design delivers a high level
of efficiency and an economical energy consump-
tion for the system.
The first pump that starts up is called the base-
load pump. The remaining pumps needed to reach
the system operating point are called peak-load
pump(s). If the system is configured to supply
drinking water according to DIN 1988, one pump
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