When Switched Off, The Unit Turns In The Opposite Direction; The Unit Starts And Stops Too Frequently; The Unit Does Not Stop; The Unit Is Leaking At The Mechanical Seal - Xylem e-IXP Installation, Operation And Maintenance Instructions
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en – Original instructions
7.9 When switched off, the unit turns in the opposite direction
Cause
Check valve faulty
Foot check valve faulty
7.10 The unit starts and stops too frequently
The unit with automatic start and stop device starts and stops too frequently.
Cause
Incorrect priming (there are air bubbles in the suction pipe or in the
unit)
Check valve locked in closed or partially closed position
Foot valve locked in closed or partially closed position
Starter set incorrectly, or faulty
Expansion vessel
• no pre-charge, or
• undersized, or
• not installed
Oversized unit
7.11 The unit does not stop
The unit with automatic start and stop device never stops.
Cause
The required flow rate is greater than the one expected
Discharge pipe leaking
Three-phase motor turning in the wrong direction
Pipes, on-off valves or filter clogged with impurities
Starter set incorrectly, or faulty
The unit runs but there is little or no flow rate
7.12 The unit is leaking at the mechanical seal
Cause
Damaged seal due to:
• wear
• thermal shock
• chemical incompatibility
• other
7.13 The frequency converter is in error mode or turned off
The frequency converter (if present) is in error mode or turned off
Cause
See the frequency converter manual
40
Solution
Replace the check valve
Replace the foot valve
Solution
Repeat the priming procedure
Replace the check valve
Replace the foot valve
Adjust or replace the starter
• Pre-charge the expansion vessel, or
• replace the expansion vessel with another suitable one, or
• install an expansion vessel
Contact Xylem or its Authorised Distributor
Solution
Reduce the required flow rate
Eliminate the leaks
Check the direction of rotation and change if necessary
Remove the impurities
Adjust or replace the starter
See paragraph 7.8
Solution
Replace the seal and check it to identify the cause of the damage.
Contact Xylem or its Authorised Distributor
Solution
See the frequency converter manual
e-IXP, e-IXPC, e-IXPF – Installation, Operation and Maintenance Instructions
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