Lowara e-HM series, Инструкция по установке, эксплуатации и обслуживанию

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Cause Remedy
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
Starting device (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
Starting device (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 thermal motor protection trips on page 31.
7.11 The unit is leaking
Cause Remedy
Worn mechanical seal • Replace the mechanical seal, or
• Fit a mechanical seal with harder seal faces
Mechanical seal damaged due to thermal shock
(presence of air bubbles in the unit)
Replace the mechanical seal
Defective mechanical seal Replace the mechanical seal
Mechanical seal damaged due to temperature of the
liquid outside the rated limits
Replace the mechanical seal with another of a suitable
make
Mechanical seal damaged due to chemical
incompatibility with the liquid
Replace the mechanical seal with a model chemically
compatible with the pumped liquid
7 Troubleshooting
32 e-HM Series Installation, Operation and Maintenance Manual