Idiomas disponibles
Idiomas disponibles
5.1.2 Anchoring
Anchor the pump/electric pump unit securely with bolts to a
concrete foundation or equivalent metal structure (shelf or
platform). If the pump/electric pump unit is large-sized and needs
to be installed near rooms inhabited by people, suitable vibration-
damping supports should be provided to prevent the transmission
of the vibrations from the pump to the reinforced concrete
structure. The dimensions of the pump base and anchoring holes
are shown in the diagrams in Fig.L.
5.1.3 Selecting the Suction and Delivery Pipes
Use pipes suited to the maximum working pressure of
the pump.
In the case of an open circuit, make sure that the diameter of the
suction pipe is suited to the installation conditions and that it is
not smaller than the diameter of the suction port. Refer to the
illustrations in section 3.1.3 and the diagrams in Fig.K.
Fig.K KEY
1 Pipe support so burden does not weigh on pump flange
On-off valve to avoid having to drain the system for
2
maintenance, repair or pump replacement operations
Flexible pipe or union to avoid transmitting vibrations to the
3
pipes
Non-return valve to prevent water backflow when pump is off,
4
in case of positive suction head or closed loop system
5 Control panel
6 Do not install elbows near the pump ports
Provide a by-pass circuit if the pump must operate with the
7
delivery side closed for more than a few seconds, in order to
avoid overheating the water inside the pump
Use eccentric reducer adaptors if it is necessary to increase the
8
diameter of the suction pipe
Use wide bends, avoid using elbows which cause excessive
9
flow resistance
The piping must have a positive gradient to prevent the
10
formation of air pockets
The diameter of the pipe must not be smaller than the
11
diameter of the pump's suction port to prevent pump
malfunctions
12 Use a foot valve in case of negative suction head
Make sure the height difference is not excessive in order to
13
prevent pump malfunctions and damage
Make sure the foot valve is adequately submerged when the
14
water is at minimum level. If the water level is too low, air
suction could occur
5.1.4 Selecting the Foot Valve
Install a foot valve at the end of the suction pipe if the level of the
liquid source is lower than the pump's. Refer to the illustrations in
section 3.1.3 and the diagrams in Fig.K.
5.1.5 Selecting the Electric Control Panel
The motors must be suitably protected against overload and short
circuits.
Make sure that the panel's electric ratings
WARNING
match those of the electric pump unit.
Improper combinations may cause problems and fail to guarantee
the protection of the electric motor.
If thermal relays are used, those that are sensitive to phase failure
are recommended.
6. Start-up
6.1 Water Connection
The water connections must be made by qualified
installation
technicians
regulations in force.
In case of connection to the water system, the
regulations issued by the competent authorities
(municipality, public utility company) must be observed.
Authorities often require the installation of a backflow prevention
device, such as a disconnector or check valve or disconnection tank.
The suction pipe must be perfectly sealed and watertight. If the
pump/electric pump unit is installed near dwellings, suitable pipes
or flexible unions should be provided to prevent the transmission
of vibrations from the pump to the pipes. Install on-off valves on
the suction and delivery sides to avoid having to drain the system
before maintenance, repair or pump replacement operations can
be performed. Whenever necessary, provide a by-pass circuit to
prevent the overheating of the water inside the pump.
Refer to the illustrations in section 3.1.3 and the diagrams in
Fig.K.
6.2 Electrical Connection
The electrical connections must be performed by a
qualified installation technician in compliance with the
regulations in force.
Make sure that the supply voltages and
WARNING
frequencies are suited to the characteristics of the
electric motor. Check the motor rating plate. Provide suitable general
protection against short circuits on the power line.
Before proceeding, make sure that all the connections
(even those that are potential-free) are voltage-free. The
power supply line must be provided with the following
devices (unless otherwise specified by the local regulations
in force:
• A short-circuit protection device
• A high-sensitivity differential device (30mA) providing
additional protection against electric shock in case the
grounding system is inefficient.
• A mains isolator switch with a contact gap of at least 3
millimeters.
Ground the system according to the regulations in force.
First of all, connect the external protection conductor to
the PE terminal, making sure that it is longer than the
phase leads. The selection of the leads (gauge, material,
sheath material,...) must take into account the actual
operating conditions. Protect the electrical leads from too
high temperatures, vibrations and collisions.
To facilitate the connection, the terminal board can be placed in
one of the four 90° positions. To obtain the most convenient
position for the connection of the power supply cables, remove
the 4 adaptor/motor fastening bolts and rotate the motor to the
desired position without removing the coupling between the
motor shaft and the pump shaft. Replace the 4 bolts and tighten
them. Remove the screws that fasten the terminal box cover and
make the connections as shown on the back of the cover and in
the diagrams in Fig.M.
6.2.1 Overload protection (single-phase motors)
The single-phase electric pump units, up to 1.5 kW power,
have an automatic reset protection incorporated in the
motor (motor protector). Be careful because the pump
could start up suddenly once the motor winding has
cooled down.
information for installers
in
compliance
with
the
19
en
