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NR, NR4 Rev. 13 - Operating Instructions
GB
The unit must be properly earthed (grounded).
Connect the earthing (grounding) conductor to the ter-
minal with the
marking.
Compare the frequency and mains voltage with the
name-plate data and connect the supply conductors to
the terminals in accordance with the appropriate diagram
inside the terminal box cover.
ATTENTION: with motor power rating ≥ 5.5 kW
avoid direct starting. Provide a control panel with
star-delta starting or an other starting device.
ATTENTION: never allow washers or other
metal parts to fall into the internal cable opening
between the terminal box and stator.
If this
occurs, dismantle the motor to recover the object
which has fallen inside.
If the terminal box is provided with an inlet gland, use a
flexible power supply cord of the H07 RN-F type with
section of cable not less than (par. 12.5 TAB 1).
If the terminal box is provided with an inlet bushing, con-
nect the power supply cord through a conduit.
For use in swimming pools (not when persons are in the
pool), garden ponds and similar places, a
residual cur-
rent device
with IΔN not exceeding 30 mA must be
installed in the supply circuit.
Install a
device for disconnection from the mains
(swit-
ch) with a contact separation of at least 3 mm in all poles.
With a three-phase motor install an overload protection
device with curve D appropriate for the rated current of
the pump.
Single-phase NRM, NR4M,
are supplied with a capaci-
tor connected to the terminals and (for 220-240 V - 50
Hz) with an incorporated thermal protector.
6.6 Operation with frequency converter
Adjust the frequency converter so that the limiting values
of min. 25 Hz and max. fN Hz will not be exceeded.
7 STARTUP AND OPERATION
7.1 Preliminary checks before start-up of the pump
Do not start-up the device in case of damaged parts.
7.2 First starting
ATTENTION: never run the pump dry.
Start the pump
after filling it completely with liquid.
When operating under a positive suction head, fill the
pump by opening the suction gate valve slowly and com-
pletely, keeping the delivery gate valve and the vent
holes (14.42) open to release the air.
For water circulation in a closed circuit, open both gate
valves completely by releasing the air.
Check that the shaft turns by hand.
With a three-phase motor check that the direction of
rotation
is as shown by the arrow on the pump casing,
otherwise, disconnect electrical power and reverse the
connections of two phases.
With a suction lift operation it may be necessary to wait a
few minutes for the pump to prime.
Check that the pump works within its field of performan-
ce, and that the absorbed current shown on the name-
plate is not exceeded.
Otherwise adjust the delivery gate valve.
Do not touch the fluid when its temperature is
higher than 50 °C.
Burn hazard. Due to high temperature of the
fluid, the pump casing and the motor may
reach temperatures higher than 50°C.
DO NOT TOUCH these parts unless with
suitable protective devices or wait and make
sure they have completely cooled.
7.3 Switch off of the pump
The appliance must be switch off every time there
are faults. (see troubleshooting).
The product is designed for a continuous duty, the swit-
ch off is performed by disconnecting the power supply by
means the expected disconnecting devices. (see para-
graph "6.5 Electrical connection").
8 MAINTENANCE
Before any operations it's necessary to disconnect the
power supply.
If required ask to an electrician or to an expert technician.
Every maintenance operations, cleaning or
reparation executed with the electrical system under
voltage, it could cause serious injuries to people.
If the supply cord is damaged, it must be replaced
by the manufacturer, its service agent or similarly
qualified persons in order to avoid a hazard.
In case of extraordinary maintenance, or maintenance ope-
rations that require part-removing, the operator must be a
qualified technician able to read schemes and drawings.
It is suggest to register all maintenance operation executed.
During maintenance keep particular attention in
order to avoid the introduction of small external
parts, that could compromise the device safety.
It is forbidden to execute any operations with the
direct use of hands. Use water-resistant, anti-cut
gloves to disassemble and clean the filter or in
other particular cases.
During
maintenance
operations
external
personnel is not allowed.
Maintenance operations that are not described in this
manual must be made only by special personnel authori-
zed by Calpeda S.p.A.
For further technical information regarding the use or the
maintenance of the device, contact Calpeda S.p.A.
8.1 Routine maintenance (Standard construction)
Before every maintenance operations disconnect
the power supply and make sure that the device
could not accidentally operate.
Burn hazard. Due to high temperature of the
fluid, the pump casing and the motor may
reach temperatures higher than 50°C.
DO NOT TOUCH these parts unless with
suitable protective devices or wait and make
sure they have completely cooled.
When the pump remains inactive it must be emptied
completely if there is a risk of freezing
.
Before restarting the unit, check that the shaft is not jam-
med and fill the pump casing completely with liquid.
8.1.1 Routine maintenance (Special construction)
Before every maintenance operations disconnect
the power supply and make sure that the device
could not accidentally operate.
Burn hazard. Due to high temperature of the
fluid, the pump casing and the motor may
reach temperatures higher than 50°C.
DO NOT TOUCH these parts unless with
suitable protective devices or wait and make
sure they have completely cooled.
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