Xylem LOWARA SMB /SVE Series, Инструкция по установке, эксплуатации и обслуживанию

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– Original instructions
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7.5 The motor runs but no water is delivered
Cause Remedy
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
Non-return valve blocked Clean the valve
Clogged pipe Clean the pipe
7.6 Loss of water from the pump unit
Cause Remedy
Mechanical seal worn or damaged Replace the mechanical seal
Undue mechanical stress on the
pump unit Support the pipes
7.7 Too noisy
Cause Remedy
Return of water when the pump
unit is not running Check the non-return valve
Cavitation Check suction
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
Cause Remedy
On-off valves closed Open the valves
Air in the suction pipe 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
Foot check valve damaged Replace the foot valve
Excessive loss of pressure in the
delivery pipes and/or in the valve Reduce the loss of water
7.9 Tripping of the main protection system (fuses)
Cause Remedy
Short circuit 1. Check the connecting cables
2. Check the frequency converter