Decommissioning The System; Maintenance - Wilo COF-2 BL Notice De Montage Et De Mise En Service

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the switchgear's commissioning instructions for
its parameterisation.
At the discharge side of the pressure-boosting
system, the pressure sensor immediately meas-
ures the pressure and the flow switch monitors
the flow: corresponding signals are transmitted to
the switchgear.
When a fire hose cabinet is opened, the pressure
at the discharge side drops and falls below the
activation level set in the switchgear, and the main
pump activates automatically.
When a fire hose cabinet that was previously open
is closed, the pressure-boosting system stops
discharge. The flow switch at the discharge side
activates and the pump stops automatically.
CAUTION!
Do not allow the pump to operate for more than
one minute with the discharge valve closed.

8.3 Decommissioning the system

If the pressure-boosting system must be decom-
missioned to allow maintenance work, repairs or
the like to be completed, proceed as follows:
• Switch off the main on/off switch and ensure that
the system cannot be reactivated by unauthorised
persons.
• Close the gate valves before and after installation.
• Isolate and drain the diaphragm pressure vessel.
• If necessary, drain the system entirely.

9 Maintenance

Maintenance and repair work must only be carried
out by qualified personnel!
DANGER! Risk of death!
In case of work on electrical devices, there is a
danger of death by electrocution.
Before performing any maintenance or repair
work, disconnect the device or system from the
power supply and make sure it cannot be reacti-
vated by unauthorised persons. In general, only
a qualified electrician/engineer should be
allowed to repair damaged connecting cables.
To ensure optimal operational reliability and to
keep operating costs at a minimum, it is advisable
to conduct inspections and maintenance of the
pressure-boosting system on a regular basis (refer
to the pump's instructions and standard EN 806-
5). To do so, the best solution is to subcontract
maintenance work to a specialist firm or our cus-
tomer service.
The following inspections must be conducted on a
regular basis:
• Check that the pressure-boosting system is in
good working order.
• Check the pumps' mechanical seals. The mechan-
ical seals use water for lubrication, small quanti-
ties of which may therefore leak from the gasket.
In case of more substantial leakage, the mechani-
cal seal must be replaced.
• Check (ideally every 3 months) that the dia-
phragm pressure vessel (option or accessory) is
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kept at the correct pressure for initial compressing
and that it is impermeable.
Caution! Risk of damage to the installation!
If the initial compressing pressure is poor, the
functioning of the diaphragm pressure vessel
cannot be ensured. This may lead to excessive
wear of the diaphragm and technical failures.
When decommissioning the system for a long
period, proceed as described in Section 8.3 and
drain all pumps by opening the drainage plugs at
the foot of the pump.
WILO SE 01/2020