Zurn-Wilkins 1-350XLSHFT Installation Guide
Contents
1. DIRECTION OF FLOW OUTDOOR INSTALLATION The Model 350 Backflow Preventer may be installed outdoors only if the device is protected against freezing conditions Exposure to freezing conditions will result in improper function or damage to the device The installation location must be kept above 32 F All the basic installation instructions apply In accordance with U S Federal Safe Drinking Water Act Lead Free requirements as of January 4 2014 this product can only be used in water systems considered non potable Please contact your local water utility for further requirements Testing Procedures MODEL 350 DOUBLE CHECK VALVE ASSEMBLY Equipment Required Differential pressure gauge test kit TEST NO 1 TIGHTNESS OF 1 CHECK VALVE REQUIREMENT The static pressure drop across check valve 1 shall be at least 1 0 psid If test cock 3 is not at the highest point of the check valve body then a vertical tube must be installed on test cock 3 so that it rises to the top of the check valve body PROCEDURE 1 Slowly open all 4 test cocks to remove any foreign material and attach fittings 2 Attach hose from the high side of the test kit to the 2 test cock 3 Open test cock 2 and bleed all air from the hose and gauge by opening the high side bleed needle valve Close high side bleed needle valve If a tube is attached to test cock 3 open test cock 3 to fill the tube Close test cock 32. 4 4 Close all test cocks slowly open shut off valve 1 amp 2 and remove test equipment 3 TEST COCK J we 2 SHUT OFF VALVE NEEDLE VALVE HIGH SIDE HOSE VENT HOSE ZURN WILKINS www zurn com Maintenance Instructions Spring GA Tailpiece CHECK ASSEMBLY All Model 350 Double Check Valve Backflow Preventers must be inspected and maintained by licensed personnel at least once a year or more frequently as specified by local codes Replace ment of worn or damaged parts must only be made with genuine ZURN WILKINS parts GENERAL MAINTENANCE 1 Clean all parts thoroughly with water after disassembly 2 Carefully inspect rubber seal rings and o rings for damage 3 Test unit after reassembly for proper operation refer to TESTING PROCEDURES f Hex Flange Bolts T No 3 Test Cock Ga No 4 2 Test Cock Inlet O ring No 1 1 Check P Test Cock Y Outlet O ring Test Cock Inlet Ball Valve FIGURE 1 ZURN WILKINS 1 Check O ring O Assembly FIGURE 2 1747 Commerce Way Paso Robles CA 93446 Phone 855 663 9876 Fax 805 238 5766 3 SERVICING CHECK VALVES 1 Close inlet and outlet shut off valves 2 Open No 2 No 3 and No 4 test cocks to release pressure from valve 3 Unscrew the 4 bolts 1 4 20 UNC Hex Flange holding the housing in place 4 Using a 2 flathead screwdriver pry loose housing by plac ing the screwdriver in the no
3. Close 2 shut off valve then close the 1 shut off valve 4 Hold gauge at same level as test cock 3 or water level in tube Slowly open test cock 3 Record the static pressure drop across check valve 1 after gauge reading stabilizes and water stops running out of test cock 3 5 Close all test cocks open shut off valve 1 and remove test equipment 2 TEST COCK 1 TEST E 4 surore VALVE NEEDLE VALVE LOW SIDE HOSE ZURN WILKINS LOW SIDE BLEED A S HIGH SIDE BLEED 2 1747 Commerce Way Paso Robles CA 93446 Phone 855 663 9876 Fax 805 238 5766 TEST NO 2 TIGHTNESS OF 2 CHECK VALVE REQUIREMENT The static pressure drop across check valve 2 shall be at least 1 0 psid If test cock 4 is not at the highest point of the check valve body then a vertical tube must be installed on test cock 4 so that it rises to the top of the check valve body PROCEDURE 1 Attach hose from the high side of the test kit to the 3 test cock 2 Open test cock 3 and bleed all air from the hose and gauge by opening the high side bleed needle valve Close high side bleed needle valve If a tube is attached to test cock 4 open test cock 4 to fill the tube Close test cock 4 Close 1 shut off valve 3 Hold gauge at same level as test cock 4 or water level in tube Slowly open test cock 4 Record the static pressure drop across check valve 2 after gauge reading stabilizes and water stops running out of test cock
4. valve at least 12 inches above surrounding flood level 4 Always consult local codes for installation methods approvals and guidance DIRECTION OF FLOW gt gt KAS A AAA NN AAACN AN AAN SANS K AANI VERTICAL INSTALLATION Vertical installation is acceptable in applica tions where inlet and outlet piping are flow ing vertically upwards All the basic installa tion instructions apply to such installations Consult factory for approval status INDOOR INSTALLATION Indoor installation is preferred in areas that are subject to freezing conditions All the basic installation instructions apply to such installations ZURN WILKINS PLACING THE MODEL 350 IN SERVICE 1 Start with both shut off valves closed Slowly open the inlet shut off valve until the backflow preventer is completely pressur ized 2 When the unit has been pressurized vent any trapped air by slightly opening each of the four test cocks 3 Slowly open the downstream shut off valve The Model 350 Double Check Valve assembly is now in service 4 After the Model 350 has been properly installed test the device see TEST PRO CEDURES If the device fails the test remove the first and second check valves and thoroughly flush the device Clean rub ber and seats of all debris and place unit back in service DIRECTION OF FLOW gt OPTIONAL STRAINER MOPED SAL PROTECTIVE we ENCLOSURE
5. Model 350 Double Check Valve Assembly 3 4 amp 1 Q Installation U Testing O Maintenance Instructions INSTALLATION INSTRUCTIONS CAUTION Installation of Backflow Preventers must be performed by qualified licensed personnel The installer should be sure the proper device has been selected for the par ticular installation Faulty installation could result in an improperly functioning device ZURN WILKINS Model 350 Double Check Valve assemblies are for use on water lines where a health hazard does not exist in the event of a backflow situation Damage to the device could result wherever water hammer and or water thermal expan sion could create excessive line pressure Where this could occur shock arresters check valves and or pressure relief valves should be installed downstream of the device If installation is in a pit or vault the Backflow Preventer must never be submerged in water because this could cause a cross connection Make sure that the pit or vault always remains dry by providing ample drainage 1 Before installing a Model 350 Backflow Preventer flush the line thoroughly to remove all debris chips and other foreign matter If required a strainer should be placed upstream of the Backflow Preventer CAUTION Do not use a strainer in seldom used emergency waterlines such as fire lines 2 Provide adequate space around the installed unit so that the test cocks will be accessible for testing and servicing 3 Install
6. r valve upstream may not be fully open 3 Low supply pressure Performance Characteristics FLOW CHARACTERISTICS MODEL 350 3 4 amp 1 STANDARD amp METRIC FLOW RATES l s 2 52 PEN O oO PRESSURE LOSS kpa mm ye PSIG Oo PRESSURE LOSS 2 3 5 Maximum working water pressure 175 PSI Maximum working water temperature 180 F Hydrostatic test pressure 350 PSI End connections Threaded ANSI B1 20 1 13 a a a a 2 5 sa a 6 9 Se ri ete te ta 2s s a o a2 a 5 s2 7s 105 167 _ Proper performance is dependent upon licensed qualified personnel performing regular periodic testing according to ZURN WILKINS specifications and prevailing governmental amp industry standards and codes and upon following these installation in structions Failure to do so releases ZURN WILKINS of any liability that it might otherwise have with respect to that device Such failure could also result in an improperly functioning device ZURN ZURN WILKINS WILKINS 1747 Commerce Way Paso Robles CA 93446 Phone 855 663 9876 Fax 805 238 5766 Al IS350 34 1 REV 4 13 www zurn com
7. tch between housing and body 5 Pull housing out of the body and remove checks by sliding them towards the outlet of housing 6 Using the same screwdriver locate the notch between seat and tailpiece of each check Insert screwdriver and twist to snap checks apart CAUTION Checks are spring loaded 7 Inspect the rubber seal ring around poppet for cuts or embedded debris 8 Ifthe poppet is damaged replace with a new poppet 9 Inspect the remaining check parts and seating areas Re move any debris 10 If necessary replace any damaged parts with new ones 11 Lightly grease o rings on checks and reinstall into housing following the above procedures in reverse order 12 Flush body prior to reinstalling housing 13 Lightly grease o rings on housing and reinstall into body following the above procedures in reverse order Note When installing housing match slight taper on the outlet of the housing with corresponding taper in body 1 Seat Poppet Ly Tailpiece ee O s t ea 2 Check 2 Check Assembly Pr FIGURE 3 ZURN WILKINS www zurn com Troubleshooting PROBLEM POSSIBLE CAUSES CORRECTIVE ACTION 1 LEAKING CHECK VALVES 1 Debris on seat or seal ring 1 Clean seat and seal ring area 2 Damaged seat 2 Replace seat 3 Damaged seal ring 3 Replace poppet 4 Damaged check o ring 4 Replace check o ring 2 LOW OR NO FLOW _ Device installed backwards 2 Shut off valves o
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