When the liquid level on the suction side is
above the pump
(inflow under positive suction
head), fill the pump by opening the suction gate valve
slowly and completely, keeping the delivery gate
valve open to release 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 perfor-
mance, and that the absorbed current shown on the
name-plate is not exceeded.
Otherwise adjust the delivery gate valve or the set-
ting of any pressure switches.
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.
7.2.1 Starting Pumps with packing seal
First loosen the gland slightly so that the seal is
decompressed.
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
switch off is performed by disconnecting the power
supply by means the expected disconnecting devi-
ces. (see paragraph "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 techni-
cian.
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
operations 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.
During maintenance operations external
personnel is not allowed.
Maintenance operations that are not described in this
manual must be made only by special personnel
authorized 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
Fig. 4
..
Before restarting the unit, check that the shaft is not
jammed 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.
ON
i
i
OFF
OFF
NM 40/20 - Operating Instructions
Page
6
4.93.142
Fig. 4 Draining.
IST NM 07_2018ed26_MXS 11_03con gall 19/06/18 09:03 Pagina 13
