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en - Original instructions
If the pump is used in an open circuit,
then the diameter of the suction pipe is
suited to the installation conditions. The
suction pipe must not be smaller than the
diameter of the suction port.
If the suction piping must be larger than
the suction side of the pump, then an
eccentric pipe reducer is installed.
If the pump is placed above liquid level, a
foot valve is installed at the end of the
suction piping.
The foot valve is fully immersed into the
liquid so that air cannot enter through the
suction vortex, when the liquid is at the
minimum level and the pump is installed
above the liquid source.
Appropriately sized on-off valves are
installed on the suction piping and on the
delivery piping (downstream to the check
valve)
for
capacity, for pump inspection, and for
maintenance.
Appropriately
installed
on
(downstream to the check valve) for
regulation of the pump capacity, for
pump inspection, and for maintenance.
In order to prevent back flow into the
pump when pump is turned off a check
valve is installed on the delivery piping.
WARNING:
Do not use the on-off valve on the
discharge side in the closed position in
order to throttle the pump for more
than a few seconds. If the pump must
operate with the discharge side closed
for more than a few seconds, a
bypass circuit must be installed to
prevent overheating of the liquid inside
the pump.
For illustrations that show the piping requirements,
see Figure 10 on page 95 and Figure 11 on page 95.
4.2.3
Electrical requirements
The local regulations in force overrule
these specified requirements.
Electrical connection checklist
Check that the following requirements are met:
The electrical leads are protected from
high
temperature,
collisions.
The power supply line is provided with:
- A short circuit protection device
- A mains isolator switch with a contact gap of
at least 3 mm
The electrical control panel checklist
NOTICE:
The control panel must match the ratings of the
electric pump. Improper combinations could fail to
guarantee the protection of the motor.
22
regulation
of
the
pump
sized
on-off
valve
the
delivery
piping
vibrations,
Check that the following requirements are met:
The control panel must protect the motor
against overload and short circuit.
Install the correct overload protection
(thermal relay or motor protector).
Pump type
Single phase standard
electric pump ≤ 2.2 kW
Three-phase
2
pump
The control panel must be equipped with
a dryrunning protection system to which
is
a pressure switch, float switch, probes, or
other suitable device is connected.
The following devices are recommended
for use on the suction side of the pump:
- When the liquid is pumped from a water
system, use a pressure switch.
- When the liquid is pumped from a storage
tank or reservoir, use a float switch or probes.
When thermal relays are used, relays
that are sensitive to phase failure are
recommended.
The motor checklist
Electrical Hazard:
and
1
fuses aM (motor starting), or magneto-thermal
switch with curve C and Icn ≥ 4,5 kA or other
equivalent device.
2
Overload thermal relay with trip class 10A + fuses
aM (motor starting) or motor protection magneto-
thermal switch with starting class 10A.
Protection
- Built-in automatic reset
thermal-amperometric
protection
protector)
- Short circuit protection
(must be supplied by
the installer)
electric
- Thermal
(must be supplied by
the installer)
- Short circuit protection
(must be supplied by
the installer)
Make sure that the control
panel
and
any
devices are suitable for
installation in the selected
location. The regulation in
force
is
the
1999/92/EC-ATEX
regarding the safety and
health of personnel who
may be exposed to the risk
of explosive atmospheres.
All
motors,
which
supplied
with
pump
mounted by the customer
aftermarket, must have an
axially locked bearing.
If the motor is equipped
with
automatic
(motor
1
protection
control
Directive
137
are
or
thermal
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