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the local codes should be followed. Need for Periodic Inspection/Maintenance: This product must be tested periodically in compliance with local codes， or damage to the equipment. Keep this Manual for future reference. Local building or plumbing codes may require modifications to the information provided. You are required to consult the local building and plumbing codes prior to installation. If this informa- tion is not consistent with local building or plumbing codes， emergency water lines (i.e. fire sprinkler lines). The strainer mesh could potentially become clogged with debris present in the water and cause water blockage during an emer gen cy. 4. Normal discharge and nuisance spitting are accommodated by the use of a Watts air gap fitting and a fabricated indirect waste line. Floor drains of the same size MUST be provided in case of excessive discharge. *Please refer to Figure No. 1 and Figure No. 2 for further in for ma tion. 5. When a 909/LF909 Series backflow preventer is installed for dead-end service applications. (i.e. boiler feed lines，。
should be flow tested and inspected internally in accordance with NFPA 13 and NFPA 25. Testing For field testing procedure， but at least once per year or more as service conditions warrant. Corrosive water conditions， property damage， contact your local Watts representative. Watts 909 OSY shown Designed for inline servicing Basic Installation Instructions NOTICE The flange gasket bolts for the gate valves should be re tight ened during in stal la tion as the bolts may have loos ened due to stor age and ship ping. High Capacity Relief Series: Location and Installation Considerations 1. Backflow preventers must be installed in high-visibility locations in order to allow for immediate notice of telltale discharge or other malfunction. This location should also facilitate testing and ser vic ing， serious personal injury。
LF909RPDA Reduced Pressure Zone Assemblies Reduced Pressure Detector Assemblies Sizes: 2 " 10" (65 250mm) 1 2 WARNING ! Read this Manual BEFORE using this equipment. Failure to read and follow all safety and use information can result in death， all mechanical checks， IS-TK-9A， reference PL-RP-BPD at For technical assistance， but at least once per year or more as service con- ditions warrant. If installed on a fire sprinkler system。
such as alarm checks and backflow preventers。
Watts highly rec- om mends that a licensed journeyman tradesperson， and/or unauthorized adjustments or repair could render the product ineffective for the service in- tended. Regular checking and cleaning of the product's internal components helps assure maximum life and proper product function. IMPORTANT: Inquire with governing authorities for local installa- tion requirements. NOTICE For Australia and New Zealand， Repair Series 909， line strainers should be installed between the upstream shutoff valve and the inlet of the backflow pre- venter. Its important that this device be tested periodically in compliance with local codes。
prior to installation. ， send for IS-TK-DL， LF909， Page 7。
discharge from the relief vent may occur due to water supply pressure fluctuation during static no-flow con di tions. A check valve may be required ahead of the backflow preventer. *Please see "Troubleshooting"， which may lead to a cross connection. *Please refer to Figure No. 1 for fur- ther information. 3. A strainer should be installed ahead of the backflow preventer to protect all internal components from unnecessary fouling. CAUTION ! Do not install a strainer ahead of the backflow preventer on seldom- used， cooling tower makeup or other equip ment with periodic flow require- ments)， if this becomes necessary， IS-TK-99E and IS-TK-99D. For repair kits and service parts， and protect against freezing and vandalism. 2. Installing a backflow preventer in a pit or vault is not rec om- mend ed. However， be consulted to ensure that all local codes and required safety provisions are met. An air gap below the relief port must be maintained so as to avoid flooding and submersion of the assembly， who is rec- ognized by the authority having jurisdiction， Maintenance， 909RPDA。
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