Chc Control Station Messages; No Filter Backwash (Bw Failure Shown On Control Panel's Screen); Screen Cleaning Required Message - EcoWater CHC Series Service And Troubleshooting Manual

5.7

CHC Control Station Messages-

5.7.1 No Filter Backwash (BW Failure shown on Control Panel's screen)-

When the Filter's Backwash has failed this indication will be shown, there are several possible
causes:
Screen Plugged- If the filtration screen becomes plugged the outlet pressure of the filter will be
below 20 psi after a Backwash. If you continue to manually initiate a back wash and the
differential pressure never falls, then the screen may need to be removed and cleaned. Refer to
Filtration Screen Cleaning.
Solenoid Failure- If the solenoid fails, the controller will try to initiate the Backwash cycle,
but no Backwash will occur. To verify disconnect the tubing from the end of the rinse piston
and initiate a back wash. Water should flow (strongly) from the tubing. If no water flows to
the Rinse piston, then verify the solenoid is being energized, if it is the valve must be replaced
or cleaned. Without water being directed to the Rinse piston, the Backwash will not be
completed. This failure could be caused by debris clogging up the screen in front of the
solenoid or a failure of the solenoid itself. If the solenoid has failed, it is recommended that the
screen be cleaned.
DP Switch Failure- If the filter's back wash can be initiated with the Manual BW button but
does not respond to the DP switch, then it is possible that the switch within the DP switch has
failed. With a volt meter, verify that the switches within the DP switch are closed during
operation (this requires the DP switch gauge to be indicating over 8 psi. If power is not applied
to the skid, the pressure will be reduced and each DP switch should be open as tested with a
conductivity meter.
Transducer Failure- If the filter's back wash can be initiated with the Manual BW button but
does not respond to the low trigger pressures as set in the CCS settings, verify that the
appropriate pressures as shown on the CCS. If no pressures are shown, then the CCS will not
backwash the filter as needed and you will have to troubleshoot the transducer signals.

5.7.2 Screen Cleaning Required Message-

This message indicates that the filter has completed 8000 Backwashes and it is recommended at
that point to remove the screen from the filter, clean it and inspect the screen and suction
manifold for damage. To clear this message, Turn ON the power disconnect, and as the initial
screen is indicated on the Control Station, press the F1 (Set UP) button. A password screen will
appear, press the screen where the password is shown and a numerical keypad will appear.
Enter 1000 and press the Enter/Return button, the screen will revert back to the Password screen
and then press the F3 button to clear the memory. Press the Main button (F4) to return to the
main screen. You will notice that all counters will be cleared with this action.
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