Pentair Flotec EVOTRONIC 350 Manuel D'utilisation page 33

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
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
• air in suction pipe => bleed the
suction pipe, repeat the "pump
priming" instructions
• the given set point or the set
pressure are low => adjust the
pressure switch
• The internal valve has not closed
=> gradually close a valve until
• Leak from suction pipe => repair
or replace suction pipe
• air in suction pipe => bleed the
suction pipe, repeat the "pump
priming" instructions
• 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 intervention pressure
USE AND MAINTENANCE MANUAL
there is a visible increase in
pressure or flow. Then open the
valve gradually until the required
flow rate is reached.
• The differential pressure inside
the pump is too low => gradually
close a valve until delivery
pressure stabilizes and the noise
level is reduced
minus 10%.
• Leak from foot valve => clean or
replace the foot valve.
EN
31