Pentair Flotec EVO-MULTIPRESS 340 SX LOGIC SAFE Manual De Uso página 29

THE PUMP STARTS UP BUT DOES NOT DELIVER LIQUID
• Pump is not primed = repeat the
"pump priming" procedure
• The pump takes in air = check the
liquid level, operation of the foot
valve and the suction pipeline
• The foot valve is blocked in the
PUMP PERFORMANCE IS REDUCED
• Pipelines obstructed = check
pipelines
• Pump is not primed correctly
= repeat the "pump priming"
procedure
PUMP PERFORMANCE IS UNSTABLE
• Pump suction pressure too low or
cavitation = check the pump inlet
conditions
• Suction pipe is partially
obstructed with impurities =
clean the suction pipe
• Leak from suction pipe = repair
THE PUMP ROTATES IN THE OPPOSITE DIRECTION WHEN SHUT DOWN
• Foot valve or check valve
defective or blocked in the open
position = remove and clean or
replace the valves
THE PUMP STARTS AND STOPS FREQUENTLY
• The membrane inside the tank is
damaged = replace the internal
membrane of the tank
• The gas pressure in the
THE PUMP DOES NOT STOP
• The pressure switch setting is
incorrect (too high) = adjust the
pressure switch to within the
pump pressure limits
closed position = replace or clean
the valve
• For self-priming pumps only:
The liquid column above the
check valve on the delivery
pipeline prevents self-priming
• For self-priming pumps only: the
internal valve has not closed =
gradually close a valve until there
is a visible increase in pressure
or replace suction pipe
• air in suction pipe = bleed the
suction pipe, repeat the "pump
priming" instructions
• +For self-priming pumps only:
The differential pressure inside
the pump is too low = gradually
• Leak from suction pipe = remove
and repair suction pipe
expansion tank is incorrect with
respect to the pressure switch
setting = adjust the gas pressure
to approximately the pump
• air in suction pipe = bleed the
suction pipe, repeat the "pump
priming" instructions
USE AND MAINTENANCE MANUAL
of the pump = drain the delivery
pipeline. Check that check valve
does not retain liquid in the
delivery pipeline. Repeat the
start-up procedure.
or flow. Then open the valve
gradually until the required flow
rate is reached.
close a valve until delivery
pressure stabilizes and the noise
level is reduced
intervention pressure minus 10%.
• Leak from foot valve = clean or
replace the foot valve.
EN
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