Backwash / Break Tank faults:
Lack of flow during backwash:
Check HMI display indicator status for breaktank pump controller.
Check mains water supply isolation valve.
Check position of regulating valve adjacent to Valve A.
Check actuator positions.
Visual check of break tank level and float switch position.
Check panel status: Incorrect valve positions, high / low tank level or solenoid inactivation will
generate an alarm after a pre-set period.
Report to ENWA.
Low break tank level alarm:
Break tanks may reach low level during normal operation. In this case the pump will switch off
and wait for the tank to refill, resetting automatically. If the tank level remains low beyond a pre-
set time period, an alarm will be generated.
Check mains water supply isolation valves.
Ensure position of regulating valve adjacent to Valve A is not altered.
Visual check of tank level and float switch position.
Report to ENWA.
Break tank duration alarm:
The PLC will check that the breaktank has been active for a minimum time period during
backwashing. If this has not been achieved by the end of the process, an alarm will be generated.
Check mains water supply isolation valves.
Check position of regulating valve adjacent to Valve A.
Check HMI display indicator status for breaktank pump controller and solenoid status.
Visual check of tank level and float switch position.
Report to ENWA.
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