EcoWater CHC Series, Service And Troubleshooting Manual

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5.3.3 High Pump Pressures-
Verify that the gauges are operating and return to 0 psi as the pump is stopped. Verify the
isolation valves at the unit as well as the towers are open. High pump pressures, if not caused
by a defective gauge, are normally caused by an obstruction to flow. If all the valves are open,
the obstruction will have to be located and removed. The obstruction may be within the CHC
chamber itself. Open the chamber and make sure that all nozzle inlets are clear of debris. Be
aware that some systems with a high head pressure due to the location of the pump as
compared to the height of the water level may increase the performance of the pump causing
higher pump pressures. In these cases, verify that the pump pressures reflect the initial
installation pump pressures and if so, disregard the current gauge reading as being high.
5.3.4 Differential pressure too High or too Low-
Verify that the gauges are operating and return to 0 psi as the pump is stopped. Systems with
centrifugal separators require at least 4 psi differential pressures between the inlet and outlet
pressures. If the pressures are too low <4 psi, verify that there is no obstruction to the flow of
the sweeper nozzles, this can also be seen by having a closed valve on the discharge of the
filter. If the differential pressures are to high (normally seen in an automated filtration system
including Filtomat, ZGF and Turbo disk systems) this indicates that the filter media is not being
cleaned appropriately during a back wash. See Filter Back Wash Failures.
Conduct a Power Clean procedure and then clean the Filter element as specified.
5.3.5 Filter Back Wash Failures-
These types of failures may be seen from a visual alarm on the controller or recognized by the
DP switch indicating a pressure that is higher than the set point continuously. Please refer to
the appropriate service manual attached for each specific type of filter. There are several types
of failures to verify:
1.
Is the back wash function working when the manual BW start switch is pressed? Make
sure that all of the appropriate valves are being controlled to implement a back wash. See
specific troubleshooting requirements for ZGF, Filtomat, and Turbo disc filters.