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Installation and operating instructions Wilo-COR..MHIE.../MS 11
8 Commissioning/decommissioning
We recommend that you arrange for initial com
-
missioning of your pressure-boosting system to
be conducted by your closest Wilo customer ser
-
vice agent or simply contact Wilo central customer
service.
8.1 General preparations and control measures
• Prior to initial commissioning, check the wiring
installed by the customer, in particular the earth
connection;
• Check the source of the water supply (sufficiently
full replenishment reservoir or appropriate munic
-
ipal water supply);
• Fill the system and ensure its impermeability by
conducting a visual inspection;
• Open the gate valves on the pumps and in the
suction and discharge pipes;
• 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
vessel’s inflating pressure must be 0.3 bar below
the pressure that activates the pumps.
DANGER!
Do not exceed the tank’s maximum
pre-inflation value.
• Check the pumps’ direction of rotation: on a short
start-up, check whether the pumps’ direction of
rotation corresponds to the arrow situated on the
pump housing. If the direction of rotation is incor
-
rect, swap two phases.
DANGER! Risk of electrical shock!
Before swapping the phases, cut the power sup
-
ply using the system’s main on/off switch.
• On the switchgear, check and adjust the required
service parameters in accordance with the instal
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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, engage
the main on/off switch.
The pressure sensor measures the available pres
-
sure and sends the corresponding electronic sig
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nal to the control device.
If the pressure is lower than the set start-up pres
-
sure, this activates the primary pump according to
the set parameters and control type and possibly
the peak-load pump(s) until the consumer’s pipe
network is filled with water and the adjusted pres
-
sure is reached.
Adjustment
Set the card’s adjustable resistor using a screw
-
driver (Fig. 3, pos. 4) to obtain the desired pres
-
sure level (read the settings on the variators’
displays).
NOTE:
Offsetting of the set point values by around 5%
between each variator is completely normal.
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 for maintenance and repair
work 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 fatal injury!
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 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, 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 diaphragm
pressure vessel is kept at the correct pressure for
initial compressing and that it is impermeable.
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