Xylem LOWARA e-SV Series Installation, Operation And Maintenance Manual

en - Original instructions
e-SV series - Installation, Operation and Maintenance Manual 35
Piping and/or unit clogged
Remove the clogging
7.7 When switched off, the unit turns in the opposite direction
Cause
Remedy
Check valve faulty
Replace the check valve
Foot check valve faulty
Replace the foot check valve
7.8 The unit produces excessive noise and/or vibrations
Cause
Remedy
Cavitation
Increase the NPSH
5
available in the system
Unsuitable anchoring to the ground
Check the anchoring to the ground
Resonance
Check the installation
Anti-vibration joints not installed
Install anti-vibration joints on the suction and
discharge sides of the unit
Foreign bodies in the unit
Remove the foreign bodies
Motor bearings worn or faulty
Replace the motor bearings
The unit does not turn freely due to a
mechanical fault
Send the unit to an authorised workshop for
testing
7.9 The unit starts up too frequently (automatic start/stop)
Cause
Remedy
Incorrect priming (there are air bubbles in the
suction pipe or in the unit)
Repeat the priming procedure
Check valve locked in closed or partially closed
position
Replace the check valve
Foot check valve locked in closed or partially
closed position
Replace the foot check valve
Starter (pressure switch, sensor, etc.) set
incorrectly, or faulty
Adjust or replace the starter
Expansion vessel
 no pre-charge, or
 undersized, or
 not installed
 Pre-charge the expansion vessel, or
 replace the expansion vessel with another
suitable one, or
 install an expansion vessel
Oversized unit
Contact Xylem or the Authorised Distributor
7.10 The unit never stops (automatic start/stop)
Cause
Remedy
The required flow rate is greater than the one
expected
Reduce the required flow rate
Discharge pipe leaking
Eliminate the leaks
Motor turns in the wrong direction
Check the direction of rotation and change it if
necessary
Pipes, on-off valves or filter clogged with
impurities
Remove the impurities
Starter (pressure switch, sensor, etc.) set
incorrectly, or faulty
Adjust or replace the starter
The unit runs but there is little or no flow rate
See the section: The thermal overload
protection triggers
5
Net Positive Suction Head

Xylem LOWARA e-SV Series Specifications

General

Brand	Xylem
Model	LOWARA e-SV Series
Category	Water Pump
Language	English