11
8.1
8.2
General preparations and control measures
•Check that all on-site wiring has been performed
correctly, in particular the earthing, prior to the
initial start-up.
•Check that the pipes connections are stress-free.
•Fill the system and subject it to a visual inspection
for leakages.
•Open the shut-off valves at the pumps and in the
suction and pressure pipes.
•Open the pump venting screws and fill the pumps
slowly with water to allow the air to escape com-
pletely. Close the venting screws once the pumps
have been fully vented!
Caution! Risk of property damage!
Do not allow the pump to run dry. Dry running
damages the mechanical seal and leads to motor
overloading.
•In suction mode (i.e. negative level difference
between break tank and pumps), the pump and the
suction line must be filled via the opening in the
venting screw (use a funnel).
•If a diaphragm pressure vessel (optional or acces-
sory) is installed, check that it is set to the correct
supply pressure.
DANGER! Risk of fatal injury!
Excessive supply pressure (nitrogen) in the dia-
phragm pressure vessel can lead to damage or
destruction of the vessel and thereby also to
personal injury.
The safety measures for the handling of pres-
surised vessels and technical gases must be
observed.
•Check for proper installation of the correct dry-
running protection (section 7.2.4.).
•In the break tank, position the float switch and
electrodes for the protection against low water
level so that the pressure-boosting system is
switched off at minimum water level
(section 7.2.4).
•Rotation control for pumps with a standard motor
without integrated frequency converter:
Activate briefly to check whether the direction of
rotation of the pump matches the arrow on the
pump housing. Swap two phases if the direction of
rotation is incorrect.
DANGER! Risk of fatal injuries!
Switch off the system’s main switch before
swapping the phases!
Protection against low water level for operation
with break tank
With Wilo break tanks, the level-dependent low
water monitoring is performed with a pressure
switch. This is electrically connected to the control
device before commissioning. Observe operating
instructions and accompanying documents for
the control device when making this connection
and apply the necessary settings. In some cases
of low volume a float switch will be used. This will
be factory set but must be checked on install and
adjusted if needed.
8.3
8.4
9
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
latest.
(See section 7.2.3)
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 against
unauthorised reactivation.
•Close the shut-off valve 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.
Maintenance
To guarantee maximum operational reliability at
the lowest possible operating costs, we recom-
mend regular inspection and maintenance of the
pressure-boosting system. It is advisable to enter
into a maintenance contract with the Wilo custom-
er service department. The following checks must
be carried out on a regular basis:
•Inspection of the operational readiness of the
pressure-boosting system.
•Inspection of 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 imperme-
ability.
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.
Summary of Contents for ISAR MODH1 Series
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