Xylem Lowara GRUPPOSFERA Instrucciones Para La Instalación Y El Uso página 8

PROBLEM
PUMP DELIVERS NO WATER,
MOTOR DOES NOT START
PUMP DELIVERS NO WATER,
MOTOR STARTS
PUMP GIVES INSUFFICIENT
WATER OR PRESSURE
PUMP STARTS TOO
FREQUENTLY
PUMP DOES NOT STOP
NOISY OPERATION
WATER LEAKS BETWEEN PUMP
SUPPORTAND MOTOR
PROBABLE CAUSE
No power supply
Overload protection tripped
Tripping of automatic switch or
differential switch
Impeller jammed
Faulty capacitor
Minimum pressure setting too low
Water level too low and foot valve
out of water
Pump not full with liquid or leaks
Non-return valve clogged
Suction lift exceeds pump lift
capacity on friction losses too high
on suction side
Pump or pipes clogged
Impeller or volute worn
Poor voltage supply
Air inside suction piping
Wrong pressure switch setting
Incorret pump choice
Wrong rotation direction (three-
phase)
Tank air-preloading insufficient or
excessive
Diaphragm broken in the tank
Wrong pressure switch setting
Water leaks through non return
valve or pipes
Maximum pressure setting too high
Suction lift too high
Pump runs beyond rated delivery
Worn bearings
Mechanical seal worn or damaged
8
NOTES
Automatic resetting after
cooling (single-phase model)
Reset the switch. If it trips again
call a qualified electrician
Foreign bodies block the impeller
Replace the capacitor.
Reset the pressure switch
Attention: mechanical seal or
impeller could be damaged
Same as above
Reduce suction lift.
Replace suction pipe with one of
larger diameter.
Reduce elbows.
Remove deposits.
Clean or unclog
Reset the pressure switch
Check the direction of rotation.
Check pre-loading pressure
Reset the pressure switch
Reset the pressure switch