Commissioning The System; Decommissioning The System; Maintenance; Faults, Causes And Remedies - Wilo COF-2 Helix Mode D'emploi

• Open the stoppers in the pumps' ventilation sys-
tem and slowly fill the pumps with water so as to
allow the air to escape entirely.
CAUTION! Risk of damage to the installation!
Never let the pump run dry. Dry running
destroys the mechanical seal and causes the
motor to overload
• Pressurise the diaphragm pressure vessel. The
tank's inflating pressure must be 0.3 bar below
the pressure that activates the pumps (Menu 1.01
of the switchgear).
DANGER!
Do not exceed the vessel's maximum pre-infla-
tion value.
• Check the pumps' direction of rotation: on a short
start-up (Menu 3.02 and 3.03), check whether the
pumps' direction of rotation corresponds to the
arrow situated on the pump housing. If the direc-
tion of rotation is incorrect, swap two phases.
DANGER! Risk of electric shock!
To swap the phases, cut the power supply using
the system's main on/off switch.
• On the switchgear, check and adjust the required
service parameters in accordance with the Instal-
lation and operating instructions supplied.

8.2 Commissioning the system

After completing all preparatory work and per-
forming all checks detailed in Section 8.1, you can
engage the main on/off switch and place the con-
trols in automatic mode.
At the pressure connection of the pressure-
boosting system, the pressure sensor immediately
measures the pressure and the flow switch moni-
tors the flow: corresponding signals are transmit-
ted to the switchgear.
When a fire hose cabinet is opened, the pressure
at the pressure connection 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 pressure con-
nection activates and the pump stops automati-
cally.
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 pressurised diaphragm pres-
sure vessel.
• If necessary, drain the system entirely.
Installation and operating instructions Wilo-COF-2 Helix

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 from the power
supply and make sure it cannot be reactivated
by unauthorised persons. In general, only a qual-
ified 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 standard DIN 1988). To do so, the best solution
is to subcontract maintenance work to a specialist
firm or our customer 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, therefore small
quantities of which may leak from the gasket. In
case of more substantial leakage, the mechanical
seal must be replaced.
• Check (ideally every 3 months) that the diaphragm
pressure vessel (option or accessory) is 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 membrane 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.

10 Faults, causes and remedies

Troubleshooting, particularly of problems relating
to the pumps and switchgear, must be performed
exclusively by a Wilo customer service agent or a
specialist firm.
NOTICE:
When carrying out all maintenance and repair
work, it is crucial that the general safety instruc-
tions are observed! It is also important to follow
the Installation and operating instructions for the
pumps and switchgear.
Danger! Risk of death!
Only specialist and appropriately qualified per-
sonnel may perform troubleshooting!
Observe the safety instructions in Chapter 9.
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