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MXA MXP MGP Rev4 - Operating Instructions
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connect 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
current device with IΔN not exceeding 30 mA must be
installed in the supply circuit.
Install a device for disconnection from the mains
(switch) 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, are supplied with a capacitor connected
to the terminals and (for 220-240 V - 50 Hz) with an
incorporated thermal protector.
ATTENTION: When the pump is fed by a
frequency converter, the minimum frequency
should not fall below 25Hz and in any case the
total head of the pump should never be lower
than 3 m.
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
OFF
ATTENTION: never run the pump dry. Start the
pump after filling it completely with liquid.
When the pump is located above the water level
(suction lift operation par. 13 fig. 2) or with a positive
suction head which is too low (less than 1 m) to open
the non-return valve, fill the pump through the priming
hole (par. 13 fig. 4).
When the liquid level on the suction side is above
the pump (inflow under positive suction head par. 13
fig. 1), fill the pump by opening the suction gate valve
slowly and completely, keeping the delivery gate valve
open to release the air.
Before starting, check that the shaft turns by hand. For
this purpose use the screwdriver notch on the shaft
end on the ventilation side.
When starting, with a three-phase motor, check
that the direction of rotation is as shown by the
arrows on the lantern bracket.
Otherwise, disconnect electrical power and reverse
the connections of two phases.
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 setting of any
pressure switches.
If a priming loss occurs (interruption of delivery flow)
or if a pressure oscillation is indicated by the pressure
gauge, make sure all the suction pipe couplings are
perfectly sealed and tighten the two sealed plugs on
the pump casing.
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.
When the water is overheated due to prolonged
operation with a closed port, stop the pump before
opening the gate valve.
To avoid any risk of danger to users and the creation of
harmful thermal stress in the pump and system due to
large temperature differentials, wait until the water has
cooled inside the pump before starting again.
If the water is overheated on account of prolonged
operation with a non-primed or insufficiently filled
pump (suction lift operation), wait until cool before
opening the draining and filling plugs.
Care must be taken when the pumped fluid
has a high temperature. 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.
7.3. Automatic regulator IDROMAT
(can be supplied on request)
For automatic control of starting/stopping of the pump
when utilization points are opened/closed.
For protection of the pump:
•against dry running;
•against the risk of operation without water at the inlet
(caused by a lack of water inflow in the inlet pipe under
positive suction head, by a non-immersed suction
pipe, by excessive suction lift or by air entering the
suction pipe);
•against operation with closed connection ports.
See installation examples par. 13 fig. 1, fig. 2.
7.4. Self-priming (Only for MXA)
(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;
• discharge pipe with a straight vertical free line above
discharge port, before a non-return valve par. 13 fig.
1.
• 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 check valve (par. 13 fig. 1) prevents reverse
siphoning through the pump when the pump is stopped
and retains water in the pump for the next start.
Without a foot valve or a check valve on the suction
connection the filling operation must be repeated
before each start-up.
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.
7.5. 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”).
8. MAINTENANCE
Before any operations it's necessary to disconnect the
power supply.
If required ask to an electrician or to an expert
technician.
MXA MXP MGP Rev4.indd 11
13/07/17 17:03
