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E-MXAM E-MXPM E-NGXM Rev6 - Operating Instructions
Page 15 / 96
8.5. Self-priming (Only for E-MXA, E-NGX)
(Capability to clear the air in the suction pipe when
starting with
the pump located above the water
level
).
Conditions for self-priming:
• suction pipe with connections perfectly airtight and
properly immersed in the water to be lifted;
• allow 0,5 m minimum of straight vertical pipe above the
discharge port, before a non-return valve par. 14 fig. 4.
•
pump casing completely filled with clean cold
water berfore starting.
The pump is not self-priming with liquids containing
oil, alcohol or foaming substances.
The integrated check valve prevents reverse siphoning
through the pump when the pump is stopped and
retains water in the pump for the next start.
ATTENTION: avoid a prolonged operation
with unprimed pump, without water
delivery from the completely opened outlet.
If the pump does not prime in 5 minutes:
stop the motor, remove the priming plug
and add more water.
If necessary, repeat the priming operation after the
pump has been first emptied and then completely filled
with clean cold water.
8.6. Vessel pressure
Once the new re-start pressure is entered (parameter
UP02), the tank preloaded pressure must be changed
to 0,2 bar lower than re-start pressure (i.e. 2,9
bar re-start pressure, tanks to be preloaded at 2.7 bar).
8.7. Gate valve regulation
With the gate valve completely open or with an outlet
pressure lower than the minimum pressure shown on
the name-plate, the pump may be noisy. To reduce
noise regulate the delivery gate valve.
8.8. Abnormal operation
Never run the pump for more than five minutes
with a closed gate valve.
Prolonged operation without a change of water in the
pump causes dangerous increases of temperature and
pressure.
Prolunged operation with a closed delivery port
causes breakage or damage to parts of the pump.
When the water is overheated due to prolonged
operation with a closed port, stop the pump before
opening the gate valve.
Do not touch the fluid when its temperature is
higher than 60 °C.
Do not touch the pump when the surface
temperature is higher than 80 °C.
Wait until the water has cooled inside the pump before
starting again or opening the draining and filling plugs.
8.9. Switch off of the pump
ON
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 devices.
(see paragraph “6.5 Electrical connection”).
9. 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
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.
i
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.
i
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.
9.1. Routine maintenance
OFF
Before every maintenance operations
disconnect the power supply and make sure
that the device could not accidentally operate.
In the case of water containing chloride
(chlorine, sea water), the risk of corrosion
increases in stagnant water condictions (also
with an increase in temperature and decrease
of pH value). In these cases,
if the pump
remains inactive for long periods, it must be
emptied completely and, preferably, dried.
For good measure, as in the case of
temporary
operation with dirty liquids
, run the pump
briefly with clean water to remove deposits.
When the pump remains inactive it must be
emptied completely if there is a risk of freezing
(
par. 14
fig. 5).
Before restarting the unit, check that the shaft is not
jammed and fill the pump casing completely with liquid.
9.2. Vessel maintenance
Inspect the tank preloaded pressure of the delivery
vessel periodically.
9.3. Dismantling the system
Close the suction and delivery gate valves and drain
the pump casing before dismantling the pump.
9.4. Dismantling the pump
OFF
Close the suction and delivery gate valves and drain
the pump casing before dismantling the pump (par. 14
fig. 5).
E-MXAM E-MXPM E-NGXM Rev6.indd 15
E-MXAM E-MXPM E-NGXM Rev6.indd 15
02/02/22 14:35
02/02/22 14:35
