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7. MAINTENANCE
- In frosty weather and for prolonged stoppages of the pump, it must
be drained by unscrewing the buttom plug.
- Fill the pump before using again.
- Do not let the pump run more than a few seconds with the dischar-
ge valve closed.
8. PROBLEMS, CAUSES AND REMEDIES
ATTENTION !
Before any action, POWER DOWN the module.
PROBLEMS
8.1 THE PUMP RUNS
a) The internal units are obstructed by
BUT THERE IS NO
foreign bodies.
FLOW.
b) Suction piping obstructed.
c) Intake of air via suction piping.
d) The pump is out of water.
e) The suction pressure is too low ; this is
generally accompanied by cavita-
tion noise.
f) The pump turns the wrong way (tree-
phase motor).
g) The motor is supplied at too low a vol-
tage.
8.2 THE PUMP
a) Poorly secured on its frame.
VIBRATES.
b) Foreign bodies obstructing the pump.
c) Pump hard to turn.
a) Poor electrical connection.
8.3 THE PUMP
b) Voltage too low.
OVERHEATS.
c) Pump obstrycted by foreign bodies.
d) Ambient temperature above +40°C.
a) The motor is not turning at its normal
8.4 THE PUMP FAILS TO
speed (foreign bodies, defective
DELIVER
motor, power supply, etc.).
SUFFICIENT
b) The motor is defective.
PRESSURE.
c) Poor filling of pump.
d) The motors turns the wrong way
(three-phase motor)
a) The rating of the thermal relay is too
8.5 THE INSTALLATION
low (three-phase motor)
TRIPS OUT.
b) The voltage is too low.
c) One phase is open-circuit.
d) The thermal relay of the circuit brea-
ker is faulty.
a) The suction height (HA) is too great.
8.6 THE FLOW IS
b) The suction piping is of a smaller dia-
IRREGULAR.
meter than the pump.
c) The strainer and suction piping are
partially obstructed.
CAUSES
a) Have the pump removed and cleaned.
b) Clean all the piping.
c) Check the tightness of the whole pipe up to the pump and seal it.
d) Reprime by filling the pump. Check the tightness of the foot valve.
e) Excessive losses of head in suction, or suction height too great (check the
NPSH of the pump installed).
f) Interchange two phases wires on the pressure switch terminal block to
reverse the direction of rotation.
g) Check the voltage on the motor terminals and the sections of the
conductors.
a) Check and completely tighten the nuts of bolts and studs.
b) Have the pump removed and cleaned.
c) Check that the pump turns freely without opposing abnormal resistance.
a) Check the connections to the pump.
b) Check the voltage on the terminals of the motor ; it must be within + or –
10% of the nominal voltage.
c) Have the pump removed and cleaned.
d) The motor is designed to operate at an ambient temperature of up to +
40°C.
a) Have the pump removed the anomaly corrected.
b) Remplace it.
c) Fill the pump and bleed until all air bubbles disappear.
d) Reverse the direction of rotation by interchanching two phases wires on
the pressure switch terminal block.
a) Check the current using an ammeter, or set tothe current marked on the
motor data plate.
b) Check the section of the conductors of the power cord.
c) Check it or/and replace it.
d) Replace it.
a) Review the installation conditions described in this manual.
b) The suction piping must be of the same diameter as the pump suction
port.
c) Remove and clean.
13
Fill the pump before using again.
Do not let the pump run more than a few seconds with the
discharge valve closed.
REMEDIES
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