High Pump Pressures; Differential Pressure Too High Or Too Low; Filter Back Wash Failures - 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.

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.

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.

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