9
Nota
: The maximum operating pressure in the installation is equal to
the pressure at nil flow of the pumps, augmented if necessary by the
municipal mains water pressure at the booster inlet.
Do not operate the pump with the discharge valve
closed for more than a few minutes.
7. MAINTENANCE
- The booster requires no special maintenance during operation.
- The motor bearings have lifetime lubrication.
- The mechanical packing requires no maintenance during operation.
- In periods when the ambient temperature is below 0°C or the pump
is stopped for a long time, it should be drained by unscrewing the
plug inside.
Always fill the pump before using it again.
CAUTION !
8. MALFUNCTIONS
Always DISCONNECT THE UNIT FROM THE ELECTRICITY SUPPLY
before carrying out repair and maintenance work on it.
MALFUNCTION
8.1 ONE OR TWO
PUMPS CANNOT
BE PRIMED.
8.2 ONE PUMP DOES
NOT OPERATE.
8.3 LACK OF
DISCHARGE
PRESSURE.
8.4 INTERMITTENT OPE-
RATION; PUMPS
STOP AND START
FREQUENTLY.
8.5 DRY RUNNING
SAFETY DEVICE
TRIPS FREQUENTLY.
8.6 OPERATIONAL
AUTOMATIC CON-
TROL DEFECTIVE.
8.7 DISCHARGE
VALVE NOT
WATERTIGHT.
8.8 PUMP VARIABLE
SPEED DRIVE
SHOWS ERROR
MESSAGE.
CAUSE
a) Air inlet at suction:
b) Foot valve / strainer: (version “B”) not
watertight or obstructed:
c) Major loss of load on suction:
d) Municipal mains water pressure insufficient
or non-existent:
e) Height of suction on tank too great (version "B"):
f) Suction piping obstructed or suction tube
valve closed:
a) Thermal protection tripped:
b) Defective or spent fuses:
c) Pump shaft blocked:
d) Defective windings:
a) Flow required is greater than the capacity
of the unit:
b) One or two pumps unprimed:
c) Municipal mains water pressure lower than
the minimum pressure needed:
d) One pump is obstructed by foreign matter:
e) The motors are being supplied at insuffi-
cient voltage:
a) Pressure transmitter defective:
b) Equipment has insufficient capacity:
c) No air in reservoir:
a) Dry running pressure switch adjusted too
high:
b) Fall in municipal mains water pressure
when pumps start up:
a) Fuses blown:
b) Wires disconnected:
c) Defective transmitter:
a) Valve membrane destroyed:
a) Code E00 to E42 lit.
REMEDY
a) Check all the suction piping connections for watertightness. Check that the suction
strainer (version ”B”) is well covered with water.
b) Check the seal on the valve; replace if necessary.
c) Calculate the load losses and make sure that they are compatible with the pumps’
NPSH.
d) If this happens more than once, it is important to make use of a tank.
e) Ensure that the min. level of the tank is compatible with the pumps' NPSH.
f) Check the valve opening and clean the tubing if necessary.
a) The pumps "fault" light on the box must be lit up. Refer to the pump and box ins-
tructions.
b) Replace them with new ones (check their calibration). If they are still disconnected,
check the absorbed current of the motor concerned. If this current is much greater
than that indicated on the motor plate's tag, it is defective and should be changed.
c) Cut off the electrical supply to the control box, then check that the shaft can rota-
te freely. If it is blocked, disassemble the pump.
d) Disassemble the pump’s variable speed drive and have it checked or replaced
with a new one.
a) Consider replacing the unit with a more suitable one (Refer to us in any case.)
b) Check that the suction strainer (version ”B”) is not absorbing air or that the tank
inflow is not too close to the strainer.
c) Discuss the matter with the water company or replace the unit. Refer to us.
d) Disassemble and clean the pump.
e) Check the voltage at the motor terminals.
a) Check the setting: the transmitter may be unstable. Replace it if necessary.
b) Install an additional tank.
c) Inflate the reservoir or replace the bladder.
a) Set the pressure switch correctly.
b) Set the dry running pressure switch at min. If the situation persists, it means the
municipal mains water supply is insufficient: check the pressure on the pressure
gauge when the pumps are being started up, or refer to the water company.
a) Replace them.
b) Check all the connections to the control box terminals.
c) Check the contacts, change the transmitter concerned if necessary.
a) Change the valves.
a) See the pump commissioning instructions (Chapter 8 - Incidents).
CAUTION !
ENGLISH
