Protection Against Low Water Level (Wms); Commissioning The System; Decommissioning The System; Maintenance - Wilo SiBoost-Smart-2 Helix V605 Notice De Montage Et De Mise En Service

English
The safety measures for the handling of pressu-
rised vessels and technical gases must be
observed.
The pressure specifications in this documenta-
tion (Fig. 5) are given 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 storage 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
over two phases if the direction of rotation is
incorrect.
DANGER! Risk of fatal injuries!
Switch off the system's main switch before
swapping over the phases.
• Check the motor protection switch in the control
device to make sure that the right nominal current
is set according to the specifications on the motor
rating plate.
• The pumps should only briefly run 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)

The pressure switch for protection against low
water level (WMS) (Fig. 6) for monitoring the sup-
ply pressure is permanently factory-set to 1 bar
(switches off if less than this) and 1.3 bar
(switches on again if more than this).

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 type of control, 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 installation has not been flushed up to
now, flush it through well at this point at the lat-
est. (See section 7.2.3)
42

8.4 Decommissioning the system

If the pressure boosting system has to be taken
out of service for maintenance, repair or other
measures, proceed as follows!
• Switch off the voltage supply and secure it against
being switched on again without authorisation
• Close the check valves upstream and downstream
of the system
• Shut off the diaphragm pressure vessel at the
throughflow valve and drain it
• Drain the system completely if necessary

9 Maintenance

To guarantee maximum operational reliability at
the lowest possible operating cost, 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:
• Check that the pressure boosting system is ready
to operate
• Check the mechanical seals on the pumps. The
mechanical seals need water for lubrication and
this can leak out of the seal slightly. If this is very
noticeable, change the 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 damage to property!
If the supply pressure is incorrect, the function
of the diaphragm pressure vessel is not guaran-
teed, which increases diaphragm wear and can
lead to system faults.
To check the supply pressure:
• Depressurise the vessel on the water side (close
the flow-through valve (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 protective cap) using an
air pressure gauge (C, Fig. 3)
• If necessary correct the pressure by adding nitro-
gen. (PN2 = pump start-up pressure pmin less
0.2-0.5 bar or the value given in the table on the
vessel (Fig. 4) – Wilo customer service). If the
pressure is too high, discharge nitrogen at the
valve.
In the case of installations with a frequency con-
verter, the inlet and outlet filter of the fan must be
cleaned if these are very dirty.
If the system at a standstill for a long period due to
decommissioning, proceed as described in 8.1 and
drain each pump by opening the drainage plug on
the pump base.
WILO SE 04/2013