Toro DT34 User's Manual
Contents
1. 1 Use a jockey pump only to fill the system at a velocity fill rate of less than 2 0 61 m per second A CAUTION Failure to comply with recommended fill rate will increase line pressure resulting in a water hammer effect that could damage sprinklers and piping components See Warning above 2 At all tees and greens use quick coupler keys with quick coupler valves to bleed air from the system lines during the filling process For best results do not compress air and then relieve it bleed the air constantly while filling the system 3 After water has filled all lines and all air is removed remove the quick coupler keys Pilot Valve Operation Electric Models Only The pilot valve controls the operation of the main valve located in the base of the sprinkler body The main valve is operated by the release of water metered through the pilot valve when it is activated either manually at the sprinkler or by the irrigation system controller The sprinkler operation mode is set using a Toro Selector Tool P N 995 15 inserted through the body flange onto the pilot valve D shaped selector cam The AUTO mode permits automatic Figure 3 100 PSI 7 0 kg cm operation from the system controller The ON mode opens the main one 80 PSI 5 6 kg cm valve for manual operation and OFF mode prevents the main valve from opening The pilot valve regulates the water pressure to the sprinkler nozzle Pressure regulation com2. Replace drive assembly c Nozzle base assembly defective Replace nozzle base assembly a Dirt in riser assembly Flush out See Flushing Procedure on page 11 b Damaged or missing return spring Replace c Damaged riser Replace a Nozzle plugged with debris Clean or replace nozzle b Nozzle orifice damaged Replace nozzle c Low operating pressure Determine why system overloaded and correct POSSIBLE CAUSE CORRECTIVE ACTION a Continuous 24 VAC to sprinkler Check controller for voltage source b Leak in pilot valve assembly Replace pilot valve assembly c Plugged supply screen on piston Clean or replace screen d Manual control selector on pilot valve assembly turned to ON position Turn to AUTO position e Plunger movement restricted Inspect and clean or replace f Valve cylinder misaligned with sprinkler body communication tube Remove valve assembly and install correctly g Foreign object keeping valve from seating Remove clean and check valve for damage Replace if necessary h Damaged piston seal or piston assembly Replace valve assembly 6 VALVE WON T CLOSE Hydraulic VALVE WON T OPEN Electric VALVE WON T OPEN Hydraulic SPRINKLER WEEPING Slow leak in valve SEVERAL VALVES ON DIFFERENT STATIONS FAIL TO CLOSE Hydraulic Leak in control tubing Isolate and repair Pilot valve leak in con
3. 80 and 100 psi DT54 Series Sprinkler Performance Data Nozzle Set Nozzle Set Nozzle Set Nozzle Set Nozzle Set Nozzle Set Nozzle Set Nozzle Set Nozzle Set Base 54 Yellow 52 Blue 53 Brown 54 Orng 55 Green 56 Gray 57 Black 58 Red 59 Beige Pressure z K BLUE MBYELLOW x RED NYELLOW x RED BYELLOW gt BEIGE IYELLOW gt BEIGE WYELLOW RED IYELLOW X BRN amp GRY WYLW amp BRN amp GRY WyLWw GRAY YELLOW psi Radius GPM Radius GPM Radius GPM Radius GPM Radius GPM Radius GPM Radius GPM Radius GPM 50 56 13 2 60 16 6 64 22 3 65 27 4 65 58 15 0 62 20 0 66 25 0 70 30 0 75 35 0 80 61 16 5 66 22 1 70 27 4 73 33 2 78 38 4 84 41 0 87 45 0 90 52 0 94 57 5 100 63 18 4 71 24 7 74 30 3 76 37 0 81 42 5 87 46 0 90 49 5 95 56 5 100 62 0 Low flow Stator Medium flow Stator High flow Toro recommends the use of a 17 4 30mm swing joint Main Nozzle Intermediate Nozzle 9 In Radius shown in feet at flows over 25 GPM 95 LPM Sprinkler radius of throw per ASAE standard S398 1 termediate Nozzle w Straightener H Inner Nozzle Yellow w Yellow Restrictor All sprinklers are equipped with the selectable pilot valve that allows settings at 50 65 80 and 100 psi Sprinkler Spacing Guidelines 1 Square Spacing No wind 55 of diameter 4mphwind 50 of d
4. 3 mm hr Body Height 11 27 9 cm Pop Up Height 4 1875 10 6 cm Inlet Size 1 5 NPT BSP or ACME Solenoid a Inrush current 0 30A 24 VAC 50 60 Hz a Holding current 0 20A 24 VAC 50 60 Hz a Manual Control Electric VIH only On Off Auto m Check O Matic model checks up to 37 11 2 m of elevation Nine Nozzle Variations See chart on page 2 DT34 Series Sprinkler Performance Data Nozzle Set Nozzle Set Nozzle Set Nozzle Set Nozzle Set Nozzle Set Nozzle Set Base 31 Yellow 32 Blue 33 Brown 34 Orange 35 Green 36 Gray 37 Black Pressure A BLUE W YELLOW RED MYELLOW RED W YELLOW x BEIGE Ml YELLOW x BIEGE YELLOW amp RED E YELLOW GRAY W YELLOW psi Radius GPM Radius GPM Radius GPM Radius GPM Radius GPM Radius GPM Radius GPM 50 56 13 2 60 16 6 64 22 3 65 27 4 65 58 15 0 62 20 0 66 25 0 70 30 0 75 35 0 80 61 16 5 66 22 1 70 27 4 73 33 2 78 38 4 84 41 0 87 45 0 100 63 18 4 71 24 7 74 30 3 76 37 0 81 42 5 87 46 0 90 49 5 Radius shown in feet Toro recommends the use of a 1 30mm swing joint at flows over 25 GPM 95 LPM Sprinkler radius of throw per ASAE standard S398 1 Main Nozzle Intermediate Nozzle Intermediate Nozzle w Straightener H Inner Nozzle Yellow w Yellow Restrictor All sprinklers are equipped with the selectable pilot valve that allows settings at 50 65
5. 4 5 24 eee 24 5 24 a 10 10 10 10 10400 10416 3175 m 5208 1587 m 3472 1058 m 2604 790 m 2 Attach control wires to solenoid leads using an approved waterproof splicing method A CAUTION All wire splices and field connections must be waterproofed to prevent short circuit to ground and subsequent controller damage Connecting Hydraulic Control Tubing 1 Route control tubing from the controller to the sprinkler location s Note Leave an 18 45 7 cm service loop of tubing at each sprinkler to facilitate movement of sprinkler and service operations Refer to Table 2 for tubing run length and sprinkler elevation information 2 Flush tubing thoroughly to remove all air and debris 3 Remove the tube retainer and poly cap from the tubing adapter at the base of the sprinkler Slide the tube retainer over the end of the control tubing and attach tubing to adapter Slide tube retainer over adapter area to secure tubing Figure 2 SS EE Station Wire 1095 334m AA Common Wire 1095 334m Total Wire Length 2190 668m x LZ gt B Faul Table 2 Hydraulic Control Systems Maximum Distance Type of System From Controller Elevation Restrictions Normally Open 01 with 3 16 Control Tubing 500 Valve elevation should not exceed 25 ABOVE controller elevation or 70 BELOW controller elevat
6. D UNDER PRESSURE CAN CAUSE SERIOUS INJURY Note Refer to Figure 6 for the following procedure 1 Insert hooked end of multi purpose tool P N 995 83 into slot provided in top of cap 3 Pull assembly upward grasp and hold in position Figure 6 2 Insert hooked end of multi purpose tool into slot in snap ring 11 Pull snap ring inward toward the sprinkler assembly then upward to remove from the snap ring groove in sprinkler body Pull riser assembly out of sprinkler body 3 Use a 5 8 nut driver P N 995 99 to unscrew main nozzle 10 4 Remove cap screw 1 and cap 3 5 Grasp return spring 14 and riser 16 firmly and hold in place while removing nozzle base 4 Turn nozzle base assembly counterclockwise to remove 6 Carefully release tension from return spring 14 7 Remove spring and seal retainer o ring assembly 12 and 13 8 Remove o ring 13 9 Remove rock screen 19 turning it counterclockwise with edge of multi purpose tool or tips of snap ring pliers P N 995 100 10 Remove drive assembly 17 and stator 18 from riser assembly by carefully pressing on end of threaded shaft 11 Using a 5 16 nut driver P N 995 105 unscrew intermediate nozzle 5 amp 6 and inner nozzle 5 and plugs 7 from the nozzle base assembly 12 Thoroughly clean and inspect all parts and replace as necessary Reassemble in the reverse order Note During reassembly ensure snap ring is correctly inst
7. ITH IRRIGATION SPRAY A FAILED OR IMPROPERLY INSTALLED SPRINKLER CONNECTION OR SPRINKLER COMPONENTS FORCIBLY EJECTED UPWARD UNDER PRESSURE CAN CAUSE SERIOUS INJURY NEVER STAND OR LEAN OVER THE SPRINKLER WHILE THE IRRIGATION SYSTEM IS BEING FILLED DURING 1 With sprinkler operating carefully step down on center of cap several times Water will flow around riser and flush out debris 2 Cycle sprinkler on and off several times to check for proper retraction Cap should be even with top of body flange when fully retracted If riser sticks in up position check for debris lodged between riser and body Flush out all debris Remove sprinkler mechanism if necessary 10 Notes 11 Notes 2007 The Toro Company Irrigation Division e www toro com Form Number 373 0423 Rev 2
8. R WILL a NOT TURN ON SPRINKLER WILL a NOT SHUT OFF E Sprinkler Assembly PROBLEM SPRINKLER WON T ROTATE HEAD STICKS UP POOR DISTRIBUTION PATTERN E Main Valve PROBLEM VALVE WON T CLOSE Electric No 24 VAC to coil assembly Electric Models Measure voltage with a Digital Volt Meter DVM Check wiring and controller program Refer to Controller Operating Instructions Selector cam in OFF position Set to AUTO position Debris in pilot valve assembly Disassemble and remove all debris See Servicing Pilot Valve page 11 Insufficient pressure in controller supply line and or sprinkler control tube N C Models Check pressure Constant 24 VAC from controller Electric Models Check for voltage using a DVM If voltage is present disconnect wire If sprinkler closes service controller Refer to Controller Service Manual Selector cam in manual ON position Set to AUTO or OFF position Debris in pilot valve assembly Disassemble and remove all debris See Servicing Pilot Valve page 11 Constant pressure from controller N C Models Check pilot valve at controller for constant flow Check elevation differential Valve elevation should not exceed 0 above controller elevation or 70 21 3 m below controller elevation POSSIBLE CAUSE CORRECTIVE ACTION a Debris wedged between stator and turbine Remove obstruction b Drive assembly defective
9. TORO Count on it DT34 and DT54 Series Rotary Sprinklers Installation amp Service Instructions Note For preliminary use only Introduction The DT34 and DT54 series full circle rotary sprinklers are designed specifically for golf course applications Manufactured from durable high strength engineering plastic and stainless steel components these sprinklers incorporate many innovative and time proven features for lasting maintenance free operation Prior to installing the sprinkler read through the recommended installation and start up procedures Please observe all WARNINGS and CAUTIONS when installing and operating this equipment Features Main nozzle trajectory allows for 25 and 15 degree selections Full 4 10 1 cm pop up clears tall grasses Nozzles color coded by radius and gallonage Cap serves as an effluent water indicator Variable stators Selectable pressure regulation settings of 50 psi 3 4 bar 65 psi 4 5 bar 80 psi 5 5 bar or 100 PSI 6 9 bar to ensure consistently accurate nozzle performance regardless of elevation electric models only Three body activation types available Electric VIH Normally Open Hydraulic VIH and Check O Matic DT34 Electric Valve In Head DT54 Electric Valve In Head Three body thread types available NPT BSP and ACME Manual sprinkler control On Off Auto electric models only Bowl vented discharge atmospheric minimizes the differentia
10. alled and fully seated in snap ring groove before operating sprinkler See WARNING above Servicing Main Valve WARNING REMOVING THE SNAP RING AND VALVE C AC POWER IS DISCONNECTED AT SOURCE A WATER SUPPLY TO SPRINKLER IS SHUT OFF AT SOURCE B All PRESSURE IS BLED FROM SYSTEM INCLUDING CONTROL TUBES IF THE VALVE SNAP RING IS DIFFICULT TO REMOVE RESIDUAL WATER PRESSURE MAY BE REMAINING IN THE SYSTEM TO PREVENT POSSIBLE SERIOUS INJURY DUE TO VALVE BEING A EJECTED UPWARD UNDER PRESSURE CONFIRM THE FOLLOWING CONDITIONS EXIST PRIOR TO 1 See WARNING above To remove valve assembly squeeze snap ring ears together with snap ring pliers P N 995 100 and remove snap ring from sprinkler body See Figure 7 Use valve removal tool P N 995 08 for DT34 or 995 09 for DT54 to remove valve assembly from base of sprinkler body Valve removal tool is inserted into sprinkler body and pushed through valve ribs A slight twist will catch tool under ribs enabling valve removal by pulling straight up and out See Figure 8 Note If valve removal tool is not available use snap ring pliers to grasp rib of valve cylinder assembly and pull up and out of sprinkler body Reinstall valve assembly using valve insertion tool P N 995 76 for DT34 or 995 101 for DT54 as follows e Load snap ring on insertion tool carrier with stepped side against carrier as shown in Figure 9 While holding snap ring in compressed position s
11. closed sprinkler exceeds 75 22 9 m differential Control tubing leak which lowers supply pressure to other stations Turn controller from station to station until a station is reached where only valves on that station stay open The leak would be in the tubing on that station Isolate and repair Leak in supply line to controller Verify by checking pressure in all control lines Leak in controller pilot valve Verify by constant discharge from controller Plugged supply line filter Replace filter if more than 3 psi 0 21 bar differential exists Servicing Procedures _ _ gt O The DT series sprinklers are designed to provide the user trouble free operation for many years without scheduled maintenance If it becomes necessary to disassemble the sprinkler to correct a malfunction or replace a component all internal parts of the sprinkler can be accessed from the top Refer to the Troubleshooting Procedure in this manual in the event of a malfunction Some special tools are required for disassembly and or maintenance of the sprinkler and are available from your Toro dealer Servicing Sprinkler Mechanism WARNING NEVER STAND OR LEAN OVER THE SPRINKLER WHILE THE IRRIGATION SYSTEM IS BEING FILLED DURING MANUAL OR AUTOMATIC OPERATION OR WHEN PERFORMING SPRINKLER SERVICE A PROCEDURES DIRECT CONTACT WITH IRRIGATION SPRAY A FAILED OR IMPROPERLY INSTALLED SPRINKLER CONNECTION OR SPRINKLER COMPONENTS FORCIBLY EJECTED UPWAR
12. esidual pressure has been bled off If the sprinkler is pressurized main valve will open when the pilot valve is disconnected from control tube Figure 10 2 Carefully remove turf and soil from the side of the sprinkler to expose pilot valve and control tubing 3 Remove the two retaining screws from the pilot valve housing 4 Pull the pilot valve assembly away from the sprinkler body and cut the control tubing just below tube retainer Unless pilot valve has been previously removed control tubing length will be sufficient for re connection 5 Remove tube retainer and remaining piece of control tubing from valve body fitting 6 Remove the solenoid 1 2 or 3 by turning it counterclockwise 7 Remove the retaining nut 18 and washer 17 from the pressure adjuster 11 and pull the pilot valve body assembly out of housing 16 8 Remove diaphragm assembly 15 piston 14 spring 13 traveling adjuster 12 pressure adjuster 11 and o ring 7 Remove selector shaft assembly 9 and plunger assembly 5 The selector shaft retains the plunger in the valve body 10 Thoroughly clean and inspect all parts Replace damaged parts as necessary and reassemble in reverse order Note Refer to Illustrated Parts Breakout Book form number 368 0044 for service part numbers Flushing Sprinkler WARNING MANUAL OR AUTOMATIC OPERATION OR WHEN PERFORMING SPRINKLER SERVICE PROCEDURES DIRECT CONTACT W
13. he swing joint allows sprinkler repositioning without changing risers This is a common and practical procedure which eliminates the problem of dirt being accidentally introduced into the lateral lines when a riser is changed Flush lines thoroughly prior to installing sprinkler Figure 1 3 Apply PTFE tape on riser threads not required on ACME threads Install sprinkler to riser and tighten Connecting Control Wires Electric Models Only A CAUTION Use only PTFE tape on riser threads Use of pipe dope or other types of sealing compounds can cause deterioration of sprinkler body threads 1 Route control wires to sprinklers Provide extra wire at sprinkler to allow for height adjustment One common wire and station wire is required for each sprinkler See Wire Sizing Chart Table 1 for proper application Note Wire length data provided in Table 1 is the sum of the station and common wire legs See example in Figure 2 Table 1 Wire Sizing Chart 4 4 a 4 a 4 5 5 5 5 12 8 4 0 5 5 5 14 14 2 5 2 5 5 14 12 2 5 4 0 23 23 23 23 23 23 23 24 24 24 24 24 24 4 Total Wire Length Between Controller and Sprinkler Voltage Voltage Drop Circular Mils 1 Sprinkler 2 Sprinklers 3 Sprinklers 4 Sprinklers 23 a a 23 4 23 23 O 4A 23 MES si 23 4 23 10 10 5 5 5 5 4 10400 8333 2540 m 4166 1270 m 2778 846 m 2083 635 m 24 P 5 24 E 2
14. iameter 8mphwind 45 of diameter Triangular Spacing No wind 60 of diameter 4mph wind 55 of diameter 8mphwind 50 of diameter 1 Single Row Spacing No wind 50 of diameter 4mphwind 50 of diameter 8mphwind 45 of diameter Note Designing for zero 0 mph wind conditions is not recommended Design for worst wind conditions For additional information refer to Toro Technical Data Manual form number 490 1737 Precipitation Rate Formulas 1 Square spaced sprinklers in pattern GPM of full circle x 96 3 Spacing 1 Triangular spaced sprinklers in pattern GPM of full circle x 96 3 Spacing 0 866 1 Area and flow Total GPM of zone x 96 3 Total irrigated square feet of zone 1 Single row GPM of full circle x 96 3 Spacing Scallop Installation Procedure To assure maximum performance from your 800S series sprinklers read these instructions completely prior to installation or service Constructing Swing Joints 1 Construct or provide triple swing joints for each sprinkler as shown in Figure 1 Use PVC or ABS pipe nipple for the sprinkler connection Note On sites where the possibility of heavy equipment rolling over a sprinkler exists the swing joint will flex preventing damage to the lateral or main lines On a new installation in raw ground where the sprinklers are to be initially installed above the finished grade and lowered when new turf is established t
15. ion Normally Open 01 with 1 4 Control Tubing 1000 Valve elevation should not exceed 25 ABOVE controller elevation or 70 BELOW controller elevation All hydraulic connections on Toro valves are 14 insert type Control line pressure must be equal to or greater than mainline pressure Control line pressure range is 40 to 150 PSI 3 System Start Up The following is a recommended procedure that will protect system components during system start up The procedure is based on a velocity fill rate of less than 2 61 m per second See Table 3 below Table 3 Recommended System Fill Rate Pipe Size Velocity Pipe Size Flow Velocity in cm GPM LPM fsec_ m sec in cm GPM LPM_ ftsec m sec 1 2 1 3 2 7 6 1 60 0 49 3 4 1 9 3 11 4 1 92 0 59 1 2 5 5 18 9 150 046 6 152 150 567 8 173 053 1 1 4 31 10 37 9 1 86 0 57 8 202 250 946 3 1 70 052 11 2 38 10 37 9 141 043 f 10 254 450 1703 0 1 97 0 60 2 5 0 20 75 7 1 80 0 55 2 1 2 6 4 1 84 0 56 A WARNING NEVER STAND OR LEAN OVER THE SPRINKLER WHILE THE IRRIGATION SYSTEM IS BEING FILLED DURING MANUAL OR AUTOMATIC OPERATION OR WHEN PERFORMING SPRINKLER SERVICE PROCEDURES DIRECT CONTACT WITH IRRIGATION SPRAY A FAILED OR IMPROPERLY INSTALLED SPRINKLER CONNECTION OR SPRINKLER COMPONENTS FORCIBLY EJECTED UPWARD UNDER PRESSURE CAN CAUSE SERIOUS INJURY
16. l pressure required for regulation and ensures positive valve closure electric models only All internal components serviceable from the top of the sprinkler Large selection of color coded nozzles available Durable plastic and stainless steel construction m Optional radius reduction screw Specifications and Performance Application Data DT34 Series m Radius 52 92 15 9 28 0 m Flow Rate 15 50 GPM 56 7 189 3 LPM Trajectory Selectable 15 or 25 Arc Full Circle Recommended Operating Pressure 65 100 PSI 4 5 6 9 Bar m Minimum Pressure 40 PSI 2 8 Bar Maximum Pressure 150 PSI 10 3 Bar m Precipitation Rate Minimum 0 46 hr 11 7 mm hr a Maximum 0 63 hr 16 mm hr Body Height 10 25 4 cm Pop Up Height 4 1875 10 6 cm Inlet Size 1 NPT BSP or ACME Electric Valve in head Solenoid a Inrush current 0 30A 24 VAC 50 60 Hz a Holding current 0 20A 24 VAC 50 60 Hz a Manual Control Electric VIH only On Off Auto m Check O Matic model checks up to 37 11 2 m of elevation m Seven Nozzle Variations See chart on page 2 DT54 Series Radius 52 100 15 9 m 30 5 m Flow Rate 15 62 GPM 56 8 234 7 LPM Trajectory Selectable 15 or 25 Arc Full Circle Recommended Operating Pressure 65 100 PSI 4 5 6 9 Bar Minimum Pressure 40 PSI 2 8 Bar Maximum Pressure 150 PSI 10 3 Bar Precipitation Rate a Minimum 0 50 hr 12 7 mm hr a Maximum 0 72 hr 18
17. lide retainer clip in to hold snap ring ears e Load valve assembly on carrier as shown Figure 7 Figure 8 e Locate position of communication tube in bottom of sprinkler body and orient insertion tool accordingly e Insert tool straight down into sprinkler body aligning bosses on t handle with holes on sprinkler body flange When valve assembly clears vertical side wall ribs inside body pull up on snap ring release mechanism DT54 models only and press valve assembly into position Snap ring will lock into groove when properly installed Remove insertion tool and check snap ring to confirm that it is fully seated in groove Figure 9 Snap Ring Release Mechanism Stepped Side of Snap Ring Snap Ring In Retainer Clip Valve Assembly Orientation In Carrier Snap Ring Released Valve Assembly Pressed Into Position Servicing Pilot Valve WARNING NEVER STAND OR LEAN OVER THE SPRINKLER WHILE THE IRRIGATION SYSTEM IS BEING FILLED DURING MANUAL OR AUTOMATIC OPERATION OR WHEN PERFORMING SPRINKLER SERVICE PROCEDURES DIRECT A CONTACT WITH IRRIGATION SPRAY A FAILED OR IMPROPERLY INSTALLED SPRINKLER CONNECTION OR SPRINKLER COMPONENTS FORCIBLY EJECTED UPWARD UNDER PRESSURE CAN CAUSE SERIOUS INJURY Note Refer to Figure 10 for the following procedure 1 Make sure that the water supply to sprinkler is positively shut off and any r
18. pensates for large variations within the system and maintains a constant pressure for optimum sprinkler operation The pilot valve is factory set to regulate one of four pressure levels 50 psi 3 4 bar 65 psi 4 5 bar 80 psi 5 5 bar or 100 PSI 6 9 bar Change the pilot valve operating pressure by loosening the thumb screw that secures the selector lever Position the selector lever to 4 6 kg cm 50 PSI 3 5 kg cm the desired operating pressure and hand tighten the nut See Figure 3 Nozzle Trajectory Adjustment Procedure Note The nozzle trajectory is factory pre set at 25 degrees 1 Insert the multi purpose tool P N 995 83 into the slot provided in the top of the cap Pull the riser assembly up then grasp the assembly to hold it in the popped up position 2 Remove the cap retaining screw and cap 3 Using a 5 8 nut driver P N 995 99 turn the nozzle housing assembly left to select 15 trajectory as shown in Figure 4 Turn the nozzle housing assembly right to select 25 trajectory as shown in Figure 5 4 Install the cap making sure the top the nozzle housing is correctly nested in the cap 5 Install the cap retaining screw 6 Activate the sprinkler to check the spray trajectory Figure 5 Figure 5 Troubleshooting E Pilot Valve Possible equipment failures with causes and corrective action are listed below PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION SPRINKLE
19. troller Confirm by observing constant dripping from discharge line of controller Refer to Controller Service Manual Valve cylinder misaligned with sprinkler body communication tube Remove valve assembly and install correctly Foreign object keeping valve from seating Remove clean and check valve for damage Replace if necessary Damaged piston seal or piston assembly Replace valve assembly Control field wires severed Isolate and repair No power to controller Establish controller power No power from controller to solenoid Check for blown fuse and replace Manual control selector on pilot valve assembly turned to OFF position Turn to AUTO position Pilot valve solenoid inoperative Remove and replace Pilot valve plunger movement restricted Inspect clean and or replace No supply from main valve Debris in control tube main valve assembly and or communication passages in body Flush thoroughly Plugged controller discharge line or discharge port in pilot valve Verify by checking for discharge at discharge line when station is activated If no discharge refer to Controller Service Manual Damaged or blocked valve seat Remove blockage and if necessary replace valve assembly Damaged piston seal or piston assembly Replace valve assembly Low pressure on supply line Check for low pressure reason and correct Elevation of normally
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