Bell & Gossett MK MV (8202, 8202X) - Manual (Page 43)

Cause Remedy
• The impeller
• The sump in order to prevent the impeller from clogging again.
If the problem persists, contact the local sales and service representative.
The pump does not stop when a level sensor is used
WARNING:
Always disconnect and lock out power before servicing to prevent unexpected startup.
Failure to do so could result in death or serious injury.
Cause Remedy
The pump is unable to empty the
sump to the stop level.
Check that:
• There are no leaks from the piping and/or discharge connection.
• The impeller is not clogged.
• The non-return valve(s) are functioning properly.
• The pump has adequate capacity. For information:
Contact the local sales and service representative.
There is a malfunction in the level-
sensing equipment.
• Clean the level regulators.
• Check the functioning of the level regulators.
• Check the contactor and the control circuit.
• Replace all defective items.
The stop level is set too low. Raise the stop level.
If the problem persists, contact the local Xylem service shop.
The pump starts-stops-starts in rapid sequence
Cause Remedy
The pump starts due to back-flow
which fills the sump to the start
level again.
Check that:
• The distance between the start and stop levels is sufficient.
• The non-return valve(s) work(s) properly.
• The length of the discharge pipe between the pump and the first non-
return valve is sufficiently short.
The self-holding function of the
contactor malfunctions.
Check:
• The contactor connections.
• The voltage in the control circuit in relation to the rated voltages on the
coil.
• The functioning of the stop-level regulator.
• Whether the voltage drop in the line at the starting surge causes the
contactor's self-holding malfunction.
If the problem persists, contact the local Xylem service shop.
Troubleshooting
MK, MV (8202, 8202X) Installation, Operation, and Maintenance Manual 41