7
Use and installation instruction manual
ENGLISH
2.3 Motor energy efficient information
All electric pumps use motors in compliance with Reg. (EC) No 640/2009 and subsequent amendments.
Therefore, they comply with the efficiency class IE3 (three-phase versions). Additional information about
motor energy performance is available online (
franklinwater.eu
- product data sheet).
For electric monobloc pumps, information about electric motors is shown on the pump nameplate, as
well as on
Tab. A2
.
For electric pumps with rigid couplings, refer to the motor nameplate and to the related technical
documentation, as well as to
Tab. A3.
For groups with flexible couplings and bare shaft pumps, refer to the motor nameplate and to the
technical documentation provided by the motor manufacturer.
2.4 Pump energy efficiency information
All pumps comply with Reg. (EC) No 547/2012. The MEI energy efficiency index is greater than or equal to
0.4 (MEI Benchmark 0.7). Refer to the nameplate and label attached to this manual for any information
regarding the pump.
LThe machine performance curves, efficiency characteristics and energy performance details are
available online (
franklinwater.eu
- product data sheet).
3 APPLICATIONS AND USE
3.1 Permitted use
These electric pumps are intended for professional use in applications such as water supply from
groundwater, pressure increase, irrigation or heat transfer fluid circulation. They can be used in
commercial, industrial, manufacturing and agricultural fields.
Electric monobloc pumps have an IP54 protection rating; those with rigid coupling an IP55 one; for bare
shaft pumps, refer to the motor nameplate. Electric pumps must be installed in dry areas and protected
from flooding.
An electric pump can operate continuously at the maximum room temperature shown on the nameplate
(refer to the motor nameplate for bare shaft pumps or electric pumps with rigid couplings).
3.2 Pumped liquids
LClean, non-aggressive liquids, compatible with the electric pump component materials. A liquid must
have physical characteristics similar to those of clean water at room temperature (1030 kg/m
3
maximum
density and 2 cPs maximum viscosity. If these limits are exceeded, contact the manufacturer).
Improper use can result in overheating of the machine and power cables, with consequences
such as failure and potentially fire.
Any water sand content must not exceed 50 g/m
3
. Higher sand concentration will reduce the electric
pump service life and increase the risk of blockage. Any suspended solids must not exceed 2 mm in
maximum size.
3.3 Conditions of use
Maximum operating pressure (pump delivery pressure, given by the sum of the pump inlet pressure
and the pressure increase created by the pump): 10 bar. The maximum pressure at the appliance inlet is
determined by the pressure increase created by the pump, so as not to exceed the maximum operating
pressure (see appropriate section).
• Do not run the machine outside the flow and head ranges specified on the nameplate.
• Sucked liquid maximum temperature: +90°C.
• Electrical supply voltage: refer to the nameplate.
• Maximum number of consecutive time start-ups: 40 (electric pumps), or follow the motor
manufacturer’s indications, if lower.
3.4 Non-permitted use
Do not use the electric pump for applications other than those described above and, in any case, not
authorised by the manufacturer. Improper use may cause serious damage (including death) to people,
animals, objects and the environment.
Do not use the electric pump connected to swimming pools, basins, ponds and in similar
places when people are immersed in water.
• Do not pump food liquids, drinking water or human food products.
• Do not pump any liquids that are more viscous and/or denser than water, unless specifically
authorised by the manufacturer.
• Do not use the machine in potentially explosive environments or with flammable liquids.
• Do not run the machine without any liquid.
• To avoid overheating, do not run the electric pump continuously at a flow rate of zero or lower than
10% of the rated value. The pump is operated at best within the range specified on the nameplate.
4 INSTALLATION – GENERALITIES
The appliance must be installed in accordance with the instructions in this manual.
The wire terminals of the power supply cable (power outlet or control panel, depending on the case)
must be protected against water, humidity and atmospheric agents. Pay attention to the protection
rating of the control panel, if any.
Before starting work on the machine, make sure that it has been disconnected from the power
supply network and that it cannot be accidentally reconnected.
Always use the required PPE (refer to the relevant section).
If necessary in relation to the conditions of use and the working environment, we suggest installing
adequate devices to immediately but safely stop the machine, in case of emergency.
4.1 Electrical connections
The connections must be exclusively performed by expert, authorised personnel and in compliance with
legal obligations, current regulations, recommended technical practices and the following provisions.
If a power cable without a plug is used, the electric pump may only be used in fixed applications (where
cables cannot be disconnected and reconnected by the user). The cable terminals must be connected in
an electrical panel with at least an IP55 protection rating, equipped with cable mechanical fixing systems
independent of electrical clips, and an omni-polar cut off switch preventing the panel from being opened
when the appliance is live.
For mobile applications, it is necessary to use electrical cables with plugs. Electrical plugs and sockets
must be earthed.
Make sure the nameplate details match the rated voltage and frequency values. Always connect the
earthing cable of the electric pump and check the earthing circuit for effectiveness before starting the
pump up and on a regular basis.
The installer is responsible for making connections in accordance with the regulations in force
in the country of installation.
The motor must be powered via a differential switch, with characteristics suitable for the load.
The motor must be protected against short circuit and overload. The installer is responsible for applying a
short circuit protection device and a class 20 overload protection device, in accordance with EN 60947-4-
1 (trip time: <8 minutes with 1.5 times IN, 6 to 20 seconds with 7.2 times IN, where IN is the rated current
specified on the nameplate), or a single integrated device. A manual reset device is recommended. It is
advisable to adjust the device to a current value not exceeding the rated value shown on the nameplate;
after that, if necessary, perform subsequent adjustments.
If a thermal break device - which is reset by disconnecting the equipment from the mains - is used, the
appliance must not be powered via a timer or similar device to prevent accidental reset.
4.2 Single-phase versions
Power the electric pump or outlet to which the plug is to be connected using a single-pole, phase cut-off
switch or a bipolar switch.
The rotation direction does not require any checks.
4.3 Three-phase versions
Power the pump via an overvoltage category III omni-polar cut-off switch, to be set up in the power
supply line in accordance with the regulations in force.
The rotation direction must be checked by observing the motor on the cooling fan side. Do not remove
the protection devices to check the rotation direction. If the operation is performed without liquid in the
pump, run the motor for as short a time as possible.
If the rotation direction cannot be visually checked, it is possible to check it indirectly by installing the
pump in the system and running it at maximum flow capacity (valves completely open, free delivery),
according to one of the two following modes: in one of the following ways:
• During operation, measure the maximum power consumption with an ammeter clamp. If the rotation
direction is incorrect, the values will be nearly double those specified on the nameplate.
• Alternatively, run the machine for a few seconds, then reverse the rotation direction and repeat the
operation. The correct direction is the one in which the greatest flow rate is obtained.
To reverse the rotation direction, it is sufficient to exchange two phases between them.
4.4 Variable frequency drive (VFD) applications
For variable frequency installations (power supply via “inverter”), make sure the frequency inverter can
supply the rated voltage and at least 10% more current than the rated value shown on the nameplate. To
install and connect the device, please refer to the manufacturer's instruction manual.
5 HYDRAULIC CONNECTIONS
Before starting any work on the electric pump or the motor, make sure that power supply is
disconnected and it cannot be accidentally restored.
Installing the electric pump can be complex and dangerous for people. This operation must,
therefore, be performed by competent, qualified installers.
Refer to
Fig. A1
or
A2
in the appendix as the case may be.
The pipe diameter determines the flow and pressure available at the points of use. Small diameter pipes
reduce performance and increase water hammers and the risk of cavitation. Adopt flow cross-sections as
great as the piping length, possibly with a larger diameter than that of the appliance outlet. In this case,
any diameter reductions along the horizontal sections must be made with asymmetrical fittings (e.g. A
in
Fig. A1
), to facilitate air escape. For the same reason, an at least 2-degree pipe angle (about 3 cm/m,
detail C in the figure) is recommended in the flow direction.
If the electric pump sucks from a non-pressurised line (e.g. a well or a tank, at a higher height than that
of the exposed surface) it is necessary to install a foot or non-return valve along the suction pipe to prime
the pump (F in
Fig. A1
). A mechanical filter may also be necessary to protect the pump. For installations
on pressurised lines or negative suction head ones, it is also advisable to install a non-return valve before
or after the pump (e.g. in position G in the figure) - to avoid emptying the delivery pipe following the
shutdown of the electric pump, and to avoid backflow - as well as a filter.
If the machine is connected to a closed hydraulic circuit, installing one or more vent valves at the highest
points of the circuit is recommended.
Secure the pipes to the flanges of the pump, without damaging them. Pay attention to the suction line
pressure which can be lower than the atmospheric one (risk of air entering joints). Make sure that the
misalignment between pipes and outlets does not generate an excessive load on the pump flanges. It
is suggested installing a flexible element on each side (E in the figure), also in order to limit vibration
transmission.
The electric pump can be installed with a pipe made of either metal or another material, provided it is
mechanically rigid and resistant to even the maximum operating temperature. Pipes must be properly
supported so as not to burden the pump flanges (detail D in the figure) and must remain in position even
with no pump. Install shut-off valves upstream and downstream of the pump, to simplify maintenance
operations (detail B).
5.1 Checking the maximum suction pressure and NPSH
It is necessary to check that the sum of the suction pressure (P in) and the maximum pump pressure
increase (H max, in bar) is lower than the maximum pump pressure (P max, in bar). Use the following
formula:
P in [bar]+ H max [m]/10 < Pmax [bar]
Also check that the NPSH available at the electric pump inlet is higher than the value required by the
pump and take an adequate safety margin into account so as to avoid the risk of cavitation. To calculate
the available NPSH, use the following formula:
NPSH = pb x 10.2 - Hv – Hs
pb: Absolute pressure of the liquid being sucked, with a running pump [bar].
NPSH: Suction head at maximum flow capacity [m] (see
fig. A6
)
Hv: Vapour pressure [m] depending on the liquid temperature [m]
Hs: Safety margin [m] (minimum 0.5)
The required NPSH values are specified in the characteristic curves shown in the appendix (
Fig. A6
). Look
for the frequency (columns) and family (rows) reference charts.
If the required NPSH value (
Fig. A6
) exceeds the available NPSH value calculated with the above formula,
the pump with negative suction head must be installed at a depth, in metres, equal to the difference
between the two values. In closed circuits, install the water pump unit/expansion vessel at the pump
inlet and pressurise the circuit.
6 MECHANICAL INSTALLATION
6.1 Machine handling
To lift the machine, use only suitable, properly marked devices (e.g. EC marking) in good working
condition. Do not exceed the load capacity of the least resistant device among all those used (lifting lug,
shackle, hook, carabiner, chain, rope, hoist or other). Only use hooks with safety triggers. Use adjustable
lifting lugs or check their maximum load capacity for non-axial loads.
The suspension point provided on the pump/electric pump does not match the machine centre
of mass.
During lifting, the machine will tend to rotate around the lifting point until it reaches a balanced position.
Slowly lift the load and pay attention to sudden overturning.
Fig. A5
provides useful information about
this. Handle with care. Pay attention to the object inertia (oscillations in the motion direction, difficulty
in slowing down and stopping).
Pay attention to suspended loads. Do not stand under them. Pay attention to people, animals
and objects in the work area. Use appropriate work area marking tools and delimiters, where
necessary. Do not operate the pump or let it pass over people.