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Operation — (continued) <br />• Smoke sensitivity is within the range <br />indicated on the nameplate label <br />• Smoke in its sensing chamber <br />• Internal sensors and electronics are functional <br />Based on the monitoring results, the LED indicator <br />flashes the following colors based on the following <br />conditions: <br />Flash <br />Flash <br />Condition <br />Interval <br />Color <br />(in seconds) <br />Normal supervisory operation. <br />Green*: <br />Smoke sensitivity is within rated <br />10 <br />limits. <br />Yellow: <br />Detector is in trouble and needs <br />4 <br />replacement. <br />Red: <br />Alarm condition. <br />1 <br />No Flash: <br />Detector is not powered. <br />-- <br />* LED can be turned OFF. <br />Please follow the corresponding description of the panel used. <br />A quick, visual inspection is sufficient to indicate the condition of <br />the detector at any time. If more detailed information is required, <br />a printed report can be provided from the Model FC9-series FACPs <br />indicating the status and settings assigned to each individual <br />detector. <br />Installation <br />All Model OP921 detectors use a surface -mounting base, Model <br />DB-11 or Model DB-11 E, which mounts on a 4-inch octagonal, <br />square or single -gang electrical box. The base utilizes screw -clamp <br />contacts for electrical connections and self -wiping contacts for <br />increased reliability. <br />The Model DB-11 base can be used with the optional Model LK 11 <br />detector locking kit, which contains 50 detector locks and an <br />installation tool to prevent unauthorized removal of the detector <br />head. Model DB-11 has decorative plugs to cover the outer - <br />mounting screw holes. <br />Model OP921 may be installed on the same initiating circuit <br />with the Siemens Model'H'-series detectors [when used with <br />the Model FC9-series of FACPs] — <br />• Model HFP-11 <br />• Model'HMS'-series manual stations <br />• Model'HTRI'-series interfaces <br />• Model HCP output -control devices <br />• Model'HZM'-series of addressable, <br />conventional zone modules <br />Application Data <br />Installation of Model OP921 detectors requires a two -wire <br />circuit. In many retrofit cases, existing wiring may be used. <br />7-tapping' is permitted only for Style 4 (Class B) wiring. <br />Model OP921 is polarity insensitive, which can greatly reduce <br />installation and debugging time. <br />Model OP921 can be applied within the maximum 30-feet <br />center spacing (900 sq. ft. areas), as referenced in NFPA 72. <br />This application guideline is based on ideal conditions — <br />specifically, smooth ceiling surfaces, minimal air <br />movement, and no physical obstructions between potential <br />fire sources and the actual detector. Do not mount <br />detectors in close proximity to ventilation or heating and air <br />conditioning outlets. Exposed joints or beamed ceilings <br />may also affect safe spacing limitations for detectors. <br />Should questions arise regarding detector placement, <br />observe NFPA 72 guidelines. Good fire -protection system <br />engineering and common sense dictate how and when <br />fire detectors are installed and used. Contact your local <br />Siemens Industry— Fire Safety distributor or sales office <br />whenever you need assistance applying Model OP921 in <br />unusual applications. Be sure to follow NFPA guidelines <br />and ®UL Listed 1©ULC Pending installation instructions — <br />included with every Siemens — Fire Safety detector — and <br />local codes as for all fire -protection equipment. <br />Technical Data <br />Operating <br />Temperature +32°F (0°C) to 120°F (49°C) <br />Range: <br />Relative Humidity: 0 — 95%; non -condensing <br />Air Pressure: No effect <br />Air Velocity: 0 — 4,000 ft. I min (0-20m I sec) <br />Input Voltage Range: 16VDC — 30VDC <br />Alarm Current (max.): 410pA <br />Standby Current (max.): 250pA, max. (average) <br />Maximum Spacing: 30-foot centers (900 sq. ft.), <br />per NFPA 72 <br />Detector Weight: <br />0.317 lbs. <br />(0.144 kg.) <br />Mechanical Protection Guard: <br />®UL Listed I `,ULC Pending <br />with STI Guard Model STI-9604 <br />SIEMENS Industry, Inc. <br />Building Technologies Division <br />CerberusTM PRO <br />