Maintenance - Calpeda MPC Serie Instrucciones De Uso

First check that the shaft turns by hand.
For this purpose use the screwdriver notch on the shaft
end at the motor fan side. Turn the shaft by hand only
in the direction indicated by the arrows on the pump
casing.
Do not start the motor if the shaft is jammed.
EN
If jammed, the impeller may unscrew should the
motor start rotating backwards. Reverse rotation
can also damage the mechanical seal.
Momentarily start the motor to check rotation of the
pump shaft, which must be as shown by the arrows
on the pump casing: clockwise when viewing the shaft
from the motor end. Otherwise, disconnect electrical
power and reverse the connections of two phases.
7.2.2. Filling
ATTENTION: avoid running dry.
When operating with the pump below water level
(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.
When the pump is located above the water level
(suction lift operation) fill the pump with water up to
suction port level through the opening on the strainer
after removing the cover (fig. 2).
Fig. 2 Filling
After starting, check that the pump works within its field
of performance and that the absorbed current shown
on the name-plate is not exceeded; otherwise adjust
the delivery gate valve.
Avoid long operation with a closed valve.
7.2.3. Self-priming
(Capability to clear the air in the suction pipe when
starting with the pump located above the water level
and when the suction pipe cannot be filled manually, as
in the case of a missing foot valve).
Maximum suction lifts and minimum self-priming times
(see the data sheet) are reached with a standard
electric motor (n = 2900 rpm), air-free water with a
temperature below 25 °C and a single suction pipe with
inlet diameter equal to that of the suction connection
of the pump.
Conditions for self-priming:
• Pump casing filled with water up to suction port level
before starting.
Note that with suction lift above 1,5-2 m (without a
Page 14 / 80
foot valve or a check valve into the suction pipe)
the filling operation must be repeated before each
start-up.
• Suction and discharge valves completely opened and
pipes not obstructed.
• Strainer basket not obstructed.
• Suction pipe with connections perfectly airtight, and
properly immersed in the water to be lifted.
• O-ring on the strainer casing and mechanical seal
perfectly airtight (properly seated, clean and not
damaged).
• Hand wheels on strainer cover and thumbscrew
drain plug on strainer casing tightened to prevent air
entering.
• Discharge pipe without check valve, with minimum 80
cm straight vertical free pipe above discharge port.
With suction lift below 2 m vertical section on the
pump can be 50 cm. With suction lift lower than 1 m,
an elbow can be mounted directly onto the delivery
port without a vertical section of piping.
On expiry of the foreseen times, make sure (through
the transparent strainer cover) pump priming has
taken place and that water is flowing regularly.
If the pump does not prime, check all conditions
above and remedy where necessary.
Repeat the priming operation again after the pump has
been completely filled with cold water.
Avoid long operation with an unprimed pump or
with a suction pipe not immersed in the water i.e. if
water level of the pool falls too low.
By lowering the water to a level below the skimmers
and other suction ports (for emptying of the pool), keep
open only the gate valve in the pipe for suction from
the bottom (main drain).
7.3. 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.
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.
MPC Rev19 - Operating Instructions