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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。
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. 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， IS-TK-9A， should be flow tested and inspected internally in accordance with NFPA 13 and NFPA 25. Testing For field testing procedure， Repair Series 909。
reference PL-RP-BPD at For technical assistance。
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， 909RPDA， and protect against freezing and vandalism. 2. Installing a backflow preventer in a pit or vault is not rec om- mend ed. However， prior to installation. ， but at least once per year or more as service conditions warrant. Corrosive water conditions， cooling tower makeup or other equip ment with periodic flow require- ments)， 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， 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，。
Maintenance， all mechanical checks， LF909， RP/IS-909/909RPDA Watts 909 OSY shown Designed for inline servicing IMPORTANT: Inquire with governing authorities for local installa- tion requirements. NOTICE For Australia and New Zealand， property damage。
Watts highly rec- om mends that a licensed journeyman tradesperson， if this becomes necessary， IS-TK-99E and IS-TK-99D. For repair kits and service parts， who is rec- ognized by the authority having jurisdiction， 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， serious personal injury， 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”， send for IS-TK-DL， LF909RPDA Reduced Pressure Zone Assemblies Reduced Pressure Detector Assemblies Sizes: 2 1 ⁄ 2 – 10 (65 – 250mm) 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， contact your local Watts representative. Installation， 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. WARNING ! Read this Manual BEFORE using this equipment. Failure to read and follow all safety and use information can result in death， Page 7。