Commissioning The System; Decommissioning The System; Maintenance - Wilo SiBoost Smart Série Notice De Montage Et De Mise En Service

to be taken from the installation and operating
instructions provided for the control device.
For operation with break tank (inlet mode)
With Wilo break tanks, the level-dependent low
water monitoring is performed using float
switches. This must be electrically connected to
the control device before commissioning.
Observe the installation and operating instruc-
tions and accompanying documents for the con-
trol device when making this connection and
applying the necessary settings.

8.3 Commissioning the system

After all the preparations and checks according to
section 8.1 have been made, switch on the main
switch and set the control system to automatic
mode. The pressure sensor measures the pressure
at hand and transmits a corresponding current
signal to the control device. If the pressure is less
than the set start-up pressure, depending on the
parameter settings and the control mode, it first
switches on the base-load pump and, as required,
the peak-load pump(s) until the consumer pipes
are filled with water and the set pressure has built
up.
WARNING! Health hazard!
If the system has not been flushed up to now,
it should be flushed thoroughly at the latest now
(see section 7.2.3).

8.4 Decommissioning the system

If the pressure-boosting system has to be taken
out of service for maintenance, repairs or other
measures, proceed as follows:
• Switch off the voltage supply and secure it against
being switched on again by unauthorised persons.
• Close the shut-off devices upstream and down-
stream of the system.
• Shut off the diaphragm pressure vessel at the
throughflow fitting and drain it.
• Drain the system completely if necessary.
Installation and operating instructions Wilo-SiBoost Smart (FC) ... Helix V/... Helix VE/... Helix EXCEL

9 Maintenance

To guarantee maximum operational reliability at
the lowest possible operating costs, we recom-
mend regular inspection and maintenance of the
pressure-boosting system (see DIN 1988). It is
advisable to enter into a maintenance contract
with a specialist company or with our central cus-
tomer service department. The following checks
should be made regularly:
• Inspection of the operational readiness of the
pressure-boosting system.
• Check the mechanical seals on the pumps. The
mechanical seals need water for lubrication and
this can leak out of the gasket slightly. If this is
noticeable, replace the mechanical seal.
• Check the diaphragm pressure vessel (optional or
accessory) (a 3-monthly cycle is recommended)
for correct supply pressure setting and leaktight-
ness (see Fig. 3 and 4).
CAUTION! Risk of property damage!
If the supply pressure is incorrect, the function
of the diaphragm pressure vessel is not guaran-
teed, which increases the diaphragm wear and
can cause system faults.
To check the supply pressure:
• 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 diaphragm pressure
vessel valve (top; remove dust cap) using an air
pressure gauge (C, Fig. 3),
• if necessary, correct the pressure by adding nitro-
gen. (PN 2 = pump start-up pressure pmin minus
0.2 – 0.5 bar or value specified in the table on the
tank (Fig. 4) – Wilo customer service). If the pres-
sure is too high, discharge nitrogen from the valve.
In the case of installations with a frequency con-
verter, the inlet and outlet filter of the fan must be
cleaned if they are very dirty.
If the system is at a standstill for a long period due
to decommissioning, proceed as described in 8.1
and drain each pump by opening the drain plug on
the pump support foot.
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