Commissioning / Decommissioning; General Preparations And Control Measures; Protection Against Low Water Level (Wms) - Wilo SiBoost Smart Série Notice De Montage Et De Mise En Service

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8 Commissioning / decommissioning

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

8.1 General preparations and control measures

• Check that all on-site wiring has been performed
correctly, in particular the earthing, prior to the
initial start-up.
• Check that the pipes joints are not under stress.
• Fill the system and subject it to a visual inspection
for leakages.
• Open the shut-off devices at the pumps and in the
suction and pressure piping.
• Open the pump venting screws and fill the pumps
slowly with water to allow the air to escape com-
pletely.
CAUTION! Risk of property damage!
Do not allow the pump to run dry. Dry running
destroys the mechanical seal and leads to motor
overload.
• 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 so:
• 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 dust cap) of the diaphragm pressure
vessel with an air pressure gauge (C, Fig. 3).
If necessary, correct the pressure if too low
(PN 2 = pump switch-on pressure pmin less
0.2 – 0.5 bar or value given in the table on
the vessel (see also Fig. 3)) by adding nitrogen
(contact Wilo customer service).
• If the pressure is too high, release nitrogen from
the valve until the required value is reached,
• reapply the dust cap,
• close the drain valve on the flow-through fix-
ture and open the flow-through fixture.
• In the event of system pressures > PN 16, the
manufacturer's filling instructions should be
observed for the diaphragm pressure vessel in
accordance with the installation and operating
instructions.
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.
The safety measures for the handling of pres-
surised vessels and technical gases must be
observed.
20
The pressure specifications in this documenta-
tion (Fig. 5) are made in bar (!). If other units of
pressure measurement are used, always be sure
to convert the figures correctly!
• In the case of an indirect connection, check that
the water level in the break tank is adequate,
or with a direct connection, that the inlet pressure
is adequate (minimum inlet pressure 1 bar)
• Correct installation of the right dry-running pro-
tection (section 7.2.4.)
• In the break tank, position the float switch or elec-
trodes for the low-water protection device so that
the pressure-boosting system is switched off at
minimum water level (section 7.2.4)
• Check the direction of rotation of pumps with
standard motors without built-in frequency con-
verters (Helix V): Switch on briefly to check
whether the direction of rotation of the pump
matches the arrow on the pump housing. Swap
two phases if the direction of rotation is incorrect.
DANGER! Risk of fatal injuries!
Switch off the system's main switch before
swapping the phases.
• Check the motor protection switch in the control
device to make sure that the correct rated current
is set according to the specifications on the motor
rating plate.
• The pumps should run only briefly against the
closed gate valve on the pressure side.
• Check and set the operating parameters required
on the control device according to the attached
installation and operating instructions.

8.2 Protection against low water level (WMS)

For operation with supply pressure
• Systems without frequency control of every pump
(SC and SC-FC)
The pressure switch for the optional protection
against low water level (WMS) kit (Fig. 6a and 6c)
for monitoring the supply pressure is permanently
factory-set to the thresholds 1 bar (deactivates if
pressure below this value) and about 1.3 bar
(reactivates when pressure exceeds this value).
It is not possible to change this setting.
• For systems with frequency control on every
pump (SCe)
The pressure sensor installed on the intake side
can also be activated by the control device as a
signal transmitter for protection against low water
level (Fig. 5c) to monitor supply pressure. The
pressure value for switching off and switching
back on can be set to a specific range in the con-
trol device. The system's factory settings are that
the system deactivates when pressure falls below
1.0 bar and reactivates when it exceeds 1.3 bar.
For more detailed descriptions of the activation
procedure and settings, see the installation and
operating instructions provided for the control
device.
If another pressure switch is used as the low-
water signal transmitter, observe the accompany-
ing description about its configuration options.
The necessary control device settings for this are
WILO SE 08/2018