AGF MAINTENANCE AND TROUBLESHOOTING
Contents
1. Kibbutz Bet Zera M P Emek Hayarden 15135 ISRAEL Export Dept Tel 972 4 6775333 Fax 972 4 6775476 AGF MAINTENANCE AND TROUBLESHOOTING Backwash Controller Adjustment 1 Adjust the restriction valve on the backwash line to allow only a trace of media to pass through 2 Backwash controller adjustments a Time in backwash 90 120 seconds b Dwell time between filters 30 seconds c Time period between backwashes 2 4 hours d Pressure differential P D adjustment over base line pressure loss 4 8 psi Tips 1 Maximum working pressure is 60 m 85 psi 2 Pump inlet should be 0 2 0 3 m 3 4 feet below the surface and a minimum of 0 8 m 2 5 feet off the bottom to prevent intake of excess dirt when pumping from a ditch or reservoir 3 Add chlorine at least twice a year to control organic growth in the filter Apply 2 to 20 p p m according to the following directions a At the end of every irrigation season add chlorine to the water in the filter for 30 minutes and allow to set Backwash for at least 2 minutes Drain all the water from the filter leaving it dry and close the inlet and outlet valves b At the beginning of the irrigation season fill the filter with water and add chlorine Let stand for 30 minutes Backwash for 2 minutes NOTE additional chlorine applications will be necessary in some areas2. Kibbutz Bet Zera M P Emek Hayarden 15135 ISRAEL Export Dept Tel 972 4 6775333 Fax 972 4 6775476 CAUTION Chlorine is dangerous Exercise appropriate caution Observe all applicable government regulations Contact a qualified chemical dealer for assistance 4 It is recommended that backup filter be installed 5 Recommended monthly Open upper cover and check sand level Add media if required 6 The sand media will need replacing every few years as the sand edges become rounded Sharp edges are necessary for proper filtration Replacing the sand 1 Close all the valves Verify that no pressure remains in the tanks 2 Open the upper service cover 3 Open the 3 plug on the lower cover and drain all the water and sand from the filter Remove the lower cover for faster draining 4 Carefully rinse the inside of the tank 5 Check the inside under drain 6 Close the 3 plug and install the lower cover Make sure threads are free of sand 7 Fill the tank with water 8 Add the new sand 9 Open all the backwash valves in sequence Kibbutz Bet Zera M P Emek Hayarden 15135 ISRAEL Export Dept Tel 972 4 6775333 Fax 972 4 6775476 TROUBLESHOOTING Symptom Leaking around grooved couplings Possible Causes 1 Pinched gasket 2 Torn or cracked gasket 3 Components out of alignment Solutions 1 Remove couplings and inspect gasket Apply gasket lube to prevent pinching 2 Remove
3. torn gasket and replace 3 Remove couplings and gaskets and inspect grooved fittings Fittings should join squarely with no major gaps Symptom Leaking around access ports Possible Causes 1 Debris between gasket and seat 2 Torn or cracked gasket 3 Cracked hatch cover Solutions 1 Remove gasket and inspect gasket and seat for any debris 2 Inspect gasket for cracking or other damage Replace if necessary 3 Inspect hatch cover for cracks or damage Replace if cracked or defective Symptom Leaking around the top hatch vent Possible Causes 1 Torn or cracked o ring 2 Damaged vent Solutions Kibbutz Bet Zera M P Emek Hayarden 15135 ISRAEL Export Dept Tel 972 4 6775333 Fax 972 4 6775476 1 Remove hatch cover and inspect vent o ring for damage Replace if necessary 2 Inspect the vent for possible cracks Replace if necessary Symptom One or several filter will not backwash Possible causes 1 Controller output problem 2 Solenoid wiring defective 3 On filters with optional selector valve valve setting incorrect 4 Solenoids clogged or damaged Solutions 1 Check for correct controller output with multi tester or switch solenoid wires with another station to check for output signal 2 Use Ohmmeter to verify that wiring is intact Attempt to manually actuate the solenoid with the small knob on the base Turn 90 degrees to open and return to close 3 Verify that selector valve knob is pointed towards th
4. If there is a discrepancy check readings with a new gauge 2 Verify that the downstream pressure during backwash is at least 15 m 20 psi If it is not it may be necessary to throttle a valve downstream of the filter station to develop sufficient backwash pressure 3 Check the backwash throttling valve setting Adjust according to the procedures outlined 4 Open the hatch covers and inspect the media bed after a backwash Verify that the sand level is correct and that there is not an excessive amount of debris in the sand 5 Verify that the backwash line meets the requirements outlined Symptom Filter station differential increases rapidly during operation especially at startup Possible causes 1 Excessive flow rate 2 Unusual concentration of contaminants Solutions 1 During system startup throttle downstream flow to the design flowrate Use a manual valve or a pump control sustaining valve 2 Check source water quality Kibbutz Bet Zera M P Emek Hayarden 15135 ISRAEL Export Dept Tel 972 4 6775333 Fax 972 4 6775476 In case you do find the appropriate solution in these sheets please refer to your local Arkal Products Representative for advice
5. e solenoid 4 Open solenoids and inspect internal ports for evidence of clogging Caution solenoid contains a spring loaded plunger Open carefully to avoid losing this component Symptom All filters in station will not backwash Possible causes 1 Controller output problem 2 Insufficient downstream pressure for backwash 3 Hydraulic command system failure Solutions 1 Check that the controller is on and programmed correctly Attempt to manually actuate the solenoids with the clock In general the solenoids will emit a noticeable click when actuated 2 Use the manual actuating screw on the base of the solenoid to backwash one tank Note the downstream pressure reading If the pressure falls below 15 m 20 psi it may be necessary to throttle the field valves to build up sufficient backwash pressure 3 Check to be sure the isolation valve is in the On position Remove one of the hydraulic tubes leading to the solenoids and Kibbutz Bet Zera M P Emek Hayarden 15135 ISRAEL Export Dept Tel 972 4 6775333 Fax 972 4 6775476 verify that pressurized water is available Inspect the hydraulic command filter for contamination Symptom Filter station differential remains high after backwash Possible causes 1 Gauge error 2 Insufficient backwash pressure 3 Insufficient backwash flow 4 Excessive contamination of media Solutions 1 Check gauge differential on manifolds against the differential gauge in the controller
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