en – Original instructions
26
7.5 The motor runs but no water is delivered
No water on suction side or inside
the pump unit
1.
Fill (prime) the pump unit or suction pipe
2.
Open the on-off valves
Air inside the suction pipe or pump
unit
1.
Vent the pump unit
2.
Check the suction connections
Loss of pressure on the suction side
Check the NPSH and, if necessary, modify the system
7.6 Loss of water from the pump unit
Mechanical seal worn or damaged
Replace the mechanical seal
Undue mechanical stress on the
pump unit
7.7 Too noisy
Return of water when the pump
unit is not running
Check the non-return valve
Rotation of pump unit hindered
Check for undue mechanical stress on the pump unit
7.8 The booster set does not generate the required pressure
1.
Eliminate the air
2.
Prime the pump units
Excessive negative suction head
Decrease the negative suction head
Excessive loss of pressure on the
suction side
Increase the diameter of the pipes
Excessive loss of pressure in the
delivery pipes and/or in the valve
7.9 Tripping of the main protection system (fuses)
1.
Check the connecting cables
2.
Check the frequency converter
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