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6.2 Operation
The pressure-boosting system is equipped with 2
non self-priming monoblock pumps.
The pumps are activated when low pressure is
detected (Fig. 1, pos. 6) and deactivated when the
flow rate is detected as zero (Fig. 1, pos. 10).
Zero-flow detection is ensured using the provided
flow switch. It consists of a sensor with a vane that
is inserted in the discharge manifold. When a hose
station is activated, flow is generated and the flow
switch is triggered.
The flow switch must be installed on the inlet on
the side of the hose system, either on the right
(Fig. 4a) or on the left (Fig. 4b), depending on the
configuration of the system.
Consult the installation and operating instructions
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 connection
7.1 Delivery and installation
Unwrap the product and remove the packaging in
an environmentally responsible manner.
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.
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 current local regulations.
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 connection 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
accordance with regulations (i.e. in accordance
with local regulations and conditions); the con-
nections for this purpose are marked accordingly
(see also the wiring diagram).
NOTICE:
20
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 reservoir and must be connected to
the switchgear by a cable with two conductors.
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") below the water load.
The following specifications must be complied
with to ensure proper functioning:
1. The diameter of the suction piping must never
be less than that of the pump,
2. The suction piping must permit underpres-
sure,
3. The system must not feature:
• Air intake upstream of the pressure-
boosting system,
• Water outflow close to the pump suction
manifold (if necessary, put in place an
anti-vortex strainer),
4. The system must be equipped with a low
water cut-out safety system:
• Using a sensor or electrode for systems
connected to reservoirs,
• Using a cut-out switch for systems
connected to a municipal water supply.
5. Do not install an automatic drain cock to the
suction side of the pressure-boosting system,
6. Limit friction loss as far as possible at the suc-
tion side that may be generated by:
• Horizontal lengths of piping that are too
long,
• Hydraulic components such as shrinkage,
pipe elbows, valves, filters, softeners and
shutoff valves.
7. Avoid any inclined plane that could lead to the
formation of an air pocket at the high point.
The diameter of the connection to the collector
tanks is detailed in the following table:
COF
COF-2BL40-120
COF-2BL40-130
COF-2BL40-140
COF-2BL40-160
COF-2BL40-170
COF-2BL40-180
COF-2BL40-210
COF-2BL40-220
COF-2BL32-140
COF-2BL32-150
COF-2BL32-160
Number of
Ø
pumps
collector
tanks
2
3"
2
3"
2
3"
2
3"
2
3"
2
3"
2
3"
2
3"
2
2"1/2
2
2"1/2
2
2"1/2
WILO SE 01/2020
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