ABW MANUAL UPDATED 03-12-14
Contents
1. Model Flange Size Screen Area Flow Empty Weight Service Area Inch Sq Ft GPM Lbs Inch ABW2 L 2 0 5 130 120 7 ABW2 LP 2 0 5 130 120 7 ABW2 S 2 1 4 200 150 13 ABW2 SP 2 1 4 200 150 13 ABW3 3 0 5 150 125 7 ABW3 S 3 1 4 200 150 13 ABW3 SP 3 1 4 200 150 13 ABW3 LP 3 2 5 300 180 20 ABW4 4 1 4 300 170 13 ABW4 P 4 1 4 300 170 13 ABW4 LPE 4 2 5 400 180 20 ABW4 L 4 5 500 230 35 ABW4 LP 4 5 500 230 35 ABW4 XLP 4 8 800 400 51 ABW4 SP 4 7 1 000 500 62 ABW6 P 6 2 5 600 180 20 ABW6 L 6 5 800 280 35 ABW6 LP 6 5 800 280 35 ABW6 XLP 6 8 800 400 51 ABW6 TXLP 6 16 1 500 900 51 ABW6 SP 6 7 1 750 400 62 ABW8 8 5 1 320 400 35 ABW8 P 8 5 1 320 300 35 ABW8 LP 8 8 1 500 450 51 ABW8 SP 8 7 1 750 500 62 ABW8 TLP 8 16 2 500 1 000 51 10 10 7 1 750 500 62 ABW10 P 10 7 1 750 500 62 ABW10 LP 10 11 2 630 650 91 ABW12 12 11 2 630 700 91 ABW12 P 12 11 2 630 700 91 ABW12 LP 12 12 5 4 000 800 91 ABW14 14 12 5 4 000 800 91 ABW14 P 14 12 5 4 000 800 91 ABW14 LP 14 16 6 000 1 000 91 ABW16 P 16 12 5 5 000 900 91 ABW16 LP 16 16 6 000 1 000 91 ABW16 L 16 16 6 000 1 000 91 ABW16 SP 16 24 10 000 1 400 91 18 18 25 8 000 1 600 91 ABW18 SP 18 24 10 000 1 800 91 ABW20 TP 20 25 8 500 2 000 91 ABW20 SP 20 24 10 000 2 500 91 ABW20 TLP 20 32 10 000 1 800 91 ABW24 SP 24 24 10 000 2 500 91 ABW24 TLP 24 32 12 0002. 34 H lt 85003 S j SSS ASAD TEA 5 18 AUTOMATIC FILTERS INC ABW OWNER S MANUAL 8 29 40 mon 54 GST Buiy g 4013 9102 341 Jono 1985 DNE MAHD ENN 3 ZZ0N 3 0 Usadng 2 lt 5 007 42411 1 L37Ln0 LAINI rn ee E a bore Fe N a gt 222 ES 19 AUTOMATIC FILTERS INC ABW OWNER S MANUAL GOZ UOS Bury coy S 22 _ 14 6 0 glue poy 40 1021 10 STI II t 18 1 9 2 21 ADMOLND amsor II alzzoN lt 9 440 2441 85290 c BuisnoH I 13710 13781 Poy 2 2 7212222125 22221222212712222 222222222211 21 22122222221222212222221222212212222172222121212222122 1 21222121222221122221 a A ENSE ENEN EENE 2 2 4 H
3. 5 Drain the remaining water from the filter body by either a Unscrewing the 1 NPT pressure release plug located on the top and bottom of the filter b Loosen the cover nuts and slightly open the cover 4 2 Filter Cleaning The coarse screen is not part of the self cleaning mechanism Therefore periodic cleaning and inspection of the coarse screen if supplied is necessary for removal of large particles trapped in the chamber To do this simply follow the shutdown procedure and then remove the filter cover It is also recommended that the fine screen be inspected during coarse screen cleaning For models with line sizes of 2 8 installer remover tool FIGURE 4 1 REMOVING FINE SCREEN WITH SCREEN INSTALLER REMOVER 4 3 Dirt Collector Replacement If the dirt collector should ever need replacing follow steps 1 through 5 in section 4 1 Shutdown Procedure and proceed as follows 1 Open the service port flange 2 Unscrew the lower bearing 3 Remove the hydraulic motor 4 Remove the dirt collector remove fine screen using screen FIGURE 4 2 INSTALLING FINE SCREEN WITH SCREEN PULLER PUSHER FIGURE 4 3 PISTON AND HYDRAULIC MOTOR REMOVAL AUTOMATIC FILTERS INC 8 ABW OWNER S MANUAL 4 4 Piston Removal Replacement If the piston needs to be removed or replaced follow the steps outlined and refer to Fig 4 3 1 Follow steps 1 5 section 4 1 2 Unscrew all
4. AUTOMATIC FILTERS INC ABW OWNER S MANUAL 25
5. FLOW 3hr 9 18 27 36 45 54 63 72 PRESSURE psi 55484 0 40 80 120 160 200 240 280 320 FLOW gpm gt FIGURE 3 2 PUMP CURVE PRESSURE VS FLOW Figure 3 2 shows an example of a pump curve Since a minimum of 40 PSI must be maintained the critical point for this pump is at 200 Any flow greater than this will not yield effective cleaning during the backwash cycle If for example the process flow were to be 190 gpm and the flush flow 40 the total flow would be 230 gom This would produce an inlet pressure less than the required 40 PSI and as a result the filter would not be able to perform an effective cleaning cycle If the process flow were to be 150 gpm with a flush flow of 40 gpm the total flow would be 190 This would produce an inlet pressure greater than the required 40 PSI and result in an effective cleaning cycle SECTION IV MAINTENANCE 4 1 Shutdown Procedure When shutting down the filter steps must be taken to ensure that there will be no reverse flow across the screen that may damage components The proper shutdown sequence is as follows 1 Open the bypass valve 2 Close the outlet valve completely AUTOMATIC FILTERS INC 7 ABW OWNER S MANUAL 3 Close the inlet valve completely The filter is now isolated and the system flow is bypassed 4 Relieve any residual pressure in the filter housing by detaching the 1 4 plastic tubing from any fitting
6. 1 ABW OWNER S MANUAL removes contaminants from the screen sending the dirty water through the nozzles and the dirt collector mechanism and out the flush valve The water passing through the hydraulic motor creates an axial rotation of the dirt collector This movement combined with linear advancement allows the dirt collector to vacuum the entire screen element The entire cleaning cycle takes approximately 4 12 seconds It should be noted that even during the flush cycle the filtration process continues uninterrupted 1 3 Recommended Applications Tekleen ABW water filters are ideal for filtering out silt scale sand rust dirt and organic material like algae zebra muscles and clams from virtually all types of water sources 1 4 Design Features Among the many features of the ABW models is an avoidance of forcing contaminated water back into the system which often happens with sand media filters ABW filters will deliver clean water or no water at all The most predominant feature is its ability to remove organics such as algae and other suspended particles All internal elements can be removed and disassembled from the filter body without disruption of the plumbing The backwash cycle Tekrinse uses 90 less rinse water than other filters on the market today For special constructions and applications see Appendix page 12 AUTOMATIC FILTERS INC 2 ABW OWNER S MANUAL 1 5 Filter Specifications Chart
7. 2 Partially close downstream mainline valve Filter inlet gauge should read at least 40 PSI 3 A super flush must be performed as follows Close the outlet valve and initiate a cleaning cycle Open the outlet valve and check the filter differential the differential does not return to zero repeat the process 5 3 Problem Frequent flushing during normal operation POSSIBLE CAUSE 1 Very dirty water 2 Marginal working pressure results in poor cleaning cycle 3 Screen may be partially plugged 4 Dirt collector may be jammed which results in only cleaning the screen directly in front of the nozzles SOLUTION 1 Screen opening size may be too small for the given application Consult manufacturer 2 Verify the inlet pressure is at least 40 PSI during the cleaning cycle If not partially close the outlet valve to increase inlet pressure 3 Perform super flush as described in section 5 2 4 Open filter and verify the dirt collector rotates freely 5 4 Problem Screen will not clean properly POSSIBLE CAUSE 1 The flush cycle duration is too short 2 Filter was shut down dirty with contaminants caked on the screen 3 Flush line is causing back pressure on the flush valve 4 Piston is not operating properly SOLUTION 1 Increase flush duration on controller panel 2 Perform super flush as described in section 5 2 3 Make sure the flush line is 1 larger than the flush valve See section 2 2 4 Verify
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9. 2 000 91 ABW30 TSP 30 48 10 000 2 500 91 ABW36 TSP 36 48 20 000 2 800 91 AUTOMATIC FILTERS INC ABW OWNER S MANUAL SECTION INSTALLATION AND HOOK UP 2 1 Mechanical Hook Up and Orientation The positioning of the filter tank should be determined by the disposal of waste water and to allow easy access and removal of filter element see Filter Specifications Chart for the required service area The Tekleen filter can rest on the inlet and outlet flanges or can be mounted on a stand if desired In fact the filter can be mounted in any position vertical upside down etc The electronic controller should be mounted in close proximity to the filter housing 2 2 Plumbing Hook Up The waste discharge pipe should be at least one inch larger in diameter than the size of the flush valve 1 valve to 2 pipe amp 2 valve to 3 pipe The waste pipe should be kept as short as possible with no more than one elbow This will minimize back pressure on the flush line FLUSH L Flush lines should not be elevated This will affect the pressure difference required for the cleaning cycle it is necessary to run flush lines uphill please consult with the manufacturer STANDARD HOOK UP AND ORIENTATION Flush line pipe must be ridged It should not be made out of flexible tube or rubber hosing Any restrictions in the flush line will reduce the cleaning
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11. ABW AUTOMATIC FILTERS INC 2672 5 LA CIENEGA BLVD LOS ANGELES CA 90034 310 839 2828 800 336 1942 FAX 310 839 6878 www Tekleen com info Tekleen com Check List for Optimal Filter Performance There should be back pressure on the flush line A 1 valve should have a 2 waste line and 2 valve should have a 3 waste line Do not use rubber hosing or flexible tubing for the waste line 1 The differential pressure gauge should be mounted within 3 feet of the filter Long tubing lines will result in faulty gauge readings The water supply line to the piston should be connected to the neck of the flush outlet and filtered by a 14 mini filter The fitting on the side of all pistons is for venting only It should be open to atmospheric pressure and pointing toward the ground Sealant should be applied on the contact points on the backside of the d p gauge to protect it from water The d p gauge should be mounted up side down to prevent shorting of the contact points in the event of a water leak If the filter outlet discharges to a tank or to open atmosphere a valve should be installed at the filter outlet to maintain a minimum working pressure of 40 PSI during the cleaning cycle If the flush valve fails to open or close verify the connections to the controller are wired correctly see diagram on pg 15 A surge protector should be installed before t
12. CH 5 2 PSV DIAPHRAGM lt 2 ELECTRONIC CONTROLLER gt PSV ACTUATOR S NOT SHOWN AUTOMA TIC FILTERS INC 2672 S La Clenego Los Angeles 90034 c D LIT yt C ANGULAR 15 EG TITLE PARTS LIST FOR ABW w PISTON CHECK EN 22221 5 02 0 31 839 2828 Fax 310 839 6878 AUTOMATIC FILTERS INC ABW OWNER S MANUAL 11 APPENDICES Appendix Special Installation AUTOMATIC BY PASS Sometimes it is necessary to have flow even when the filter is out off service for periodic maintenance In this situation it is recommended to create a by pass FILTER BY PASS It is very simple to create a by pass especially for the on line models To do so add a block valve on both the inlet and outlet and a bypass with another block valve see drawing If the by pass valves are provided with actuators it can be converted into an automatic by pass system by wiring them to the controller see controller FILTER WITH BY PASS manual Appendix ll Alternate Flushing Methods There are several possible solutions if there is not enough pressure and or flow to successfully achieve a backwash For low flow installations with pressure greater than 40 PSI proceed as follows 1 The easiest method is to place an automatic valve pressure sustaining valve at the filter outlet The valve will FLUSHING WITH close w
13. IC FILTERS INC ABW OWNER S MANUAL PRESSURE DROP DATA 150 FT a j 2 _ T y _ ___ __ 184 4 AUTOMATIC FILTERS INC ABW OWNER S MANUAL 100 120 140 160 18 190 200 220 240 280 300 320 340 360 380 400 40 60 80 20 FLOW GPM 24 WARRANTY Automatic Filters Inc AFI warrants its filters and controllers to be free from original defects for one year from the date of original sale The manufacturer will replace free of charge any part found defective under normal use and service within the guarantee period provided the product is installed used and maintained in accordance with good engineering practice and all applicable instructions or limitations issued by AFI The manufacturer assumes no liability for incidental consequential damage sustained in the adoption or use of our engineering data service or products Liability is limited to the repair or replacement of the products No agent or representative of AFI has the authority to waive or add to this agreement Altered products or use of products in manner not intended shall void this warranty All warranty claims must be sent along with the defective product freight prepaid to AFI at its business address All warranty shipments are for the account of the buyer The warranty period shall be 12 months from the date of shipment to the client
14. ability of the filter A block valve should be installed at the inlet of the filter During start up the block valve should be only slightly open to prevent a surge of pressure across the filter when the pump is started Once the pump is on line slowly open the block valve This will prevent any possible damage to the filter due to a pressure surge 2 3 GB6 DP Gauge and Electric Ball Valve Connection Before power is applied to the electronic controller make all connections between the controller DP Gauge and electric ball valve see page 14 1 BALL VALVE Plug controller into appropriate power source Connect the ball valve to the controller as shown in the wiring diagram page 14 Activate the manual start switch on the GB6 controller and visually inspect the open and close movement of the ball valve AUTOMATIC FILTERS INC 4 ABW OWNER S MANUAL 2 FLUSHING TIME ADJUSTMENT The flush time is normally set to 8 seconds Flush time should be adjusted to allow the piston indicator pin to reach the end of the slot during one backwash cycle NOTE Excessive flush time will not improve cleaning and may lead to unnecessary wear and tear on filter equipment 3 PRESSURE DIFFERNTIAL ADJUSTMENT The differential switch is preset for 7 PSI It can be changed to different set points see your electronic controller manual USING 1 4 INCH DIAMETER TUBING 1 Attach tubing to the low pressure 1 2 fitting the outlet flange Atta
15. alve If a downstream main line valve is partially closed enough to provide 40 PSI at the filter inlet pressure gauge the self cleaning cycle will operate properly Once the total system is fully charged the downstream valve can be adjusted as long as 40 PSI is maintained at the filter inlet during the cleaning cycle AUTOMATIC FILTERS INC 5 ABW OWNER S MANUAL In applications where the main flow to the filter is intentionally interrupted and the line is drained it is advisable to install a flow control or pressure sustaining valve downstream from the filter This will create back pressure on the filter in order to enable proper flushing while main line pressurizes Once the system is fully pressurized push the manual flush button on the electronic controller and verify that the piston is moving For pistons with non metal casings a flashlight can be held up to the case where the bottom cap of the piston can be seen and a visual check performed to verify the piston is completing the full stroke For metal pistons an indicating pin is located underneath the piston cover sleeve and can be checked to verify the full stroke of the piston is obtained Also during this manual flush verify that the flush valve is opening all the way During the first cleaning cycle air in the system will be expelled so it may require more than one cycle to achieve proper cleaning 3 2 Cleaning Cycle Requirements WORKING PRESSURE The filter require
16. ch the other end of the tubing to the fitting on the DP switch marked low pressure 2 Attach tubing to the high pressure 14 fitting on the inlet flange Attach the other end of the tubing to the fitting on the DP switch marked high pressure Notes Do not run tubing more than three feet in length preferably two feet or less Due to the pressure drop across the tubing the electronic controller may not operate properly if tubing is too long 3 Attach tubing to the end of the piston Attach the other end to the fitting on the neck of the flush outlet before the flush valve The mini filter should be added to this 14 line to prevent larger debris particles from plugging the piston fitting on the side of the piston should point downward and be used to vent the piston see appendix IV pg 14 SECTION 1 OPERATION AND ADJUSTMENTS 3 1 Start Up During start up the block valve at the filter inlet should be only partially open to prevent a surge of pressure across the filter when the pump is started Once the pump is on line slowly open the block valve This will prevent any possible damage to the filter due to a pressure surge During the initial filling of the main pipeline there may not be enough back pressure downstream from the filter to allow the cleaning cycle to function properly Therefore it is necessary to install a valve at the outlet to be partially closed i e gate valve ball valve or butterfly v
17. connection nuts 3 Remove piston from the filter housing 4 Re assemble unit reverse procedure 4 5 Periodic Inspection The following parts should be inspected annually for wear and tear and should be replaced if necessary Cover Seal Coarse Screen Fine Screen O rings Piston Dirt Collector Nozzles Dirt Collector Upper Bearing Lower Bearing Air Water Connections SECTION V TROUBLESHOOTING GUIDE 5 1 Problem Excessive pressure drop through filter without flushing POSSIBLE CAUSES 1 Controller is not turned on 2 Flush valve is wired incorrectly 3 Filter is installed backwards 4 D P switch is malfunctioning SOLUTIONS 1 Turn the power switch to on 2 Consult the wiring diagram and verify that the valve is connected correctly 3 Verify correct flow through filter 4 Check set point on D P switch Make sure 1 black tubing is less than feet in length and unobstructed Verify that the D P switch is connected to the appropriate fittings on the filter 5 2 Problem Frequent or continuous flushing while filling main pipeline POSSIBLE CAUSES 1 Downstream pressure is not available to provide effective cleaning cycle 2 High flow rate exceeds the D P switch s preset differential 3 Filter may have been shut down while the screen is dirty resulting in a layer of contaminant on the screen that has caked on AUTOMATIC FILTERS INC 9 ABW OWNER S MANUAL SOLUTIONS 1 amp
18. he electronic controller It is recommended that a pressure gauge be installed on the inlet of the filter To ensure proper installation email digital pictures with contact information to info tekleen com before startup ABW AUTOMATIC FILTERS INC Tekleen 2672 S LA CIENEGA BLVD LOS ANGELES CA 90034 310 839 2828 800 336 1942 FAX 310 839 6878 www Tekleen com info Tekleen com Table of Contents SECTION INTRODUCTION 1 4 Description 1 2 Theory of Operation 1 3 Recommended Applications 1 4 Design Features 1 5 Filter Specification Chart SECTION II INSTALLATION AND HOOK UP 2 1 Mechanical Hook Up and Orientation 2 2 Plumbing Hook Up 2 3 GB6 DP Gauge and Electric Ball Valve Connection SECTION III __ OPERATION AND ADJUSTMENTS 3 1 Start up 3 2 Cleaning Cycle Requirements SECTION MAINTENANCE 4 1 Shutdown Procedure 4 2 Filter Cleaning 4 3 Dirt Collector Replacement 4 4 Piston Removal Replacement 4 5 Periodic Inspection SECTION V_ TROUBLESHOOTING GUIDE 5 1 Excessive pressure drop through filter without flushing 5 2 Frequent or continuous flushing while filling main pipeline Frequent flushing during normal operation 5 4 Screen Will Not Clean Properly SECTION VI SPARE PARTS 6 1 Recommended Spare Parts 6 2 Spare Parts List APPENDICES Appendix Special Installation Appendix II Alternate Flushing Methods Appendix III System with Discharge to Atmosphere Appendix IV Pi
19. hen the filter is flushing During ais ite the cleaning cycle there would be no water available to the system and the full pump capacity will be used for the backwash filter AUTOMATIC FILTERS INC 12 ABW OWNER S MANUAL 2 The required extra flow be obtained by means of an expansion tank installed directly upstream of the filter inlet The expansion tank would contain water at operating pressure to supply to the filter during the cleaning cycle FLUSHING WITH EXPANSION TANK 3 Another way to obtain supplemental flow is to add a water source to the inlet of the filter The water source would be controlled with an actuated valve opening during the cleaning cycle see controller manual for wiring EXTERNAL FLUSHING NORMAL OPERATION EXTERNAL FLUSHING CLEANING CYCLE Appendix 1 System with Discharge to Atmosphere If the filter freely discharges to the atmosphere it is recommended that a control valve be installed at the filter outlet In this case the control vale at the outlet would be used to create back pressure on the system by reducing the flow across the filter In addition the discharge valve can be used as a 1 pressure sustaining valve in cases where pressure is not adequate during FILTER WITH DISCHARGE TO ATMOSPHERE backwash AUTOMATIC FILTERS INC 13 ABW OWNER S MANUAL Appendix IV Piston Due to longer screens on larger filters it is necessary to employ a piston for
20. s a minimum pressure of 40 PSI at the inlet during the cleaning cycle for effective cleaning Maintaining the necessary minimum working pressure during the cleaning cycle requires a pump with sufficient capacity Pump selection will depend on three key parameters the required working pressure 40 PSI the process flow of the system and the flush flow of the filter PROCESS FLOW Process flow is the volumetric rate of water that will pass through the filter during normal operation when the filter is not in a cleaning cycle FLUSH FLOW The flush flow is the volumetric rate of water that will be used during a cleaning cycle This rate depends on the size of the flush valve used FLUSH VALVE SIZE FLUSH FLOW inch mm gpm m hr 1 DN25 60 80 14 18 1 5 DN40 120 160 27 36 2 DN50 240 320 55 73 To determine if a pump will satisfy the performance needs of your system add the process flow of the system to the flush flow of the filter to find the total flow AUTOMATIC FILTERS INC 6 ABW OWNER S MANUAL Process Flow Flush Flow Total Flow Consult the pump curve provided by the pump manufacturer to determine if it meets the performance requirements The pump curve describes the performance of the pump in terms of flow and pressure Locate your total flow on the graph to determine what pressure will be maintained at that flow If the pressure is greater than 40 PSI then the pump satisfies the requirements
21. ston ILLUSTRATIONS ABW Installation Layout with GB6 and Electric Flush Valve Cutaway of ABW2 LP Cutaway of ABW3 4 Cutaway of ABW4L 6L 8 Cutaway of ABW6xL 8L 8L 12 14 16 ABW 2LP with GB6 Controller ABW 3 4 with GB6 Controller Particulate Removal Process Pressure Drop vs Screen Size WARRANTY Q N N ON SECTION INTRODUCTION 1 1 Description The ABW series features automatic self cleaning screen type water filters The filtration system consists of a filter body with a first stage coarse screen and a second stage fine screen a flushing valve and an electronic controller DIRTY WATER COARSE SCREEN FINE SCREEN HYDRAULIC MOTOR FLUSH OUTLET HYDRAULIC PISTON 1 2 Theory of operation Pressurized water enters the filter inlet and travels through a 3 8 perforated stainless steel coarse screen 1 2 for smaller models where large particles are pre filtered The water then passes through a fine mesh stainless steel screen where small contaminants down to 10 microns in size are filtered out The clean water then exits through the outlet of the filter When the fine screen becomes contaminated a pressure differential is sensed causing the automatic controller to open the flush valve When the flush valve opens an atmospheric pressure path is established causing the clean water to reverse flow at the point of suction across the filter element This process AUTOMATIC FILTERS INC
22. that the indicator pin is moving during the cleaning cycle Make sure that the inlet pressure is at least 40 PSI during the cleaning cycle SECTION VI SPARE PARTS 6 1 Recommended Spare Parts The following are recommended spare parts to keep in stock Fine Screen 4 Set of O rings 16 Cover Seal 10 Dirt Collector 5 Upper Bearing 11 Lower Bearing 12 AUTOMATIC FILTERS INC 10 ABW OWNER S MANUAL D P Switch 34 Piston Repair Kit 29 Mini Filter 18 6 2 Spare Parts List Controller Board Dirt Collector Nozzles 6 PART WITH FINE N 5 5 05 2 UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TLI ICE S AWN anel Stenberg 18 07 NUMBERS ARE DESIGNATED FILTER MODEL NUMBER FOR EXAMPLE THE PART NUMBER FOR A FINE SCREEN FOR AN ABW 4 LP IS 4 ABW4 LP 4 IS THE PART NUMBER FOR SCREEN ABW 4 LP IS THE FILTER MODEL FILTER HOUSING COVER COARSE SCREEN FINE SCREEN DIRT COLLECTOR DIRT COLLECTOR NOZZLE HYDRAULIC MOTOR LUSH VALVE ASSEMBLY OVER SEAL PPER BEARING OWER BEARING HANDLE OLLECTOR PIN PPER LOWER O RING LUSH VALVE ACTUATOR INI FILTER lt OPTIONAL USHING ASSEMBLY OVER NUT YDRAULIC PISTON 1 5 R SHORT LONG OVER WASHER OVER STUDS SET OF FITTINGS PRESS SUSTAIN VALVE 5 2 PISTON REPAIR N 5 2 SCREEN INSTALLER REMOVER N S PISTON GUARD DIFF PRESS SWIT
23. the cleaning mechanism The piston is used to control the linear movement of the dirt collector during cleaning cycles This enables the dirt collector to clean the entire surface area of the screen in a spiral downward movement At the end of the cleaning cycle the flush valve closes and the normal filtration process resumes At the same time the piston is pressurized which pushes the dirt collector back into its original position ready for the next cleaning cycle Upon initial installation of the system all seals within the piston may not be set in place This may lead to water leaking from the piston which is normal In addition to protecting the piston the PVC cover sleeve allows water leakage to be drained to a single location After the system has been running for some time the seals within the piston will set and the leakage will decrease or stop completely The cover sleeve can also be slid back to expose the bolt holes and piston indicating pin Note Some ABW models come with a different piston than what is pictured below Mini Filter For 5 5 Piston Vent Open To Atmosphere FILTER WITH PISTON AUTOMATIC FILTERS INC 14 ABW OWNER S MANUAL PISTON AUTOMATIC FILTERS INC ABW OWNER S MANUAL 15 BAYA 21433 13 989 43413 403 8289 6688 0162 8282 6 8 0
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