3003 W CASINO RD BLDG 45-715 2024-12-05

Application Data Installation of Model HI921 intelligent, addressable thermal detector requires a two-wire SLC circuit. In many retrofit cases, existing wiring may be used. 'T-tapping' is permitted only for Style 4 (Class B) wiring. Model HI921 is polarity insensitive when not used in Class-X mode, which can reduce installation and debugging times. The unit's value is multiplied with built-in ISOtechnology the True Class-X- NFPA 72 compliant SLC isolation feature supporting up to 252 isolation ready devices per loop. When used in mixed mode a maximum of 30 non-isolated devices between isolation devices (wired in polarity-insensitive mode). Each detector fits into one (1) wall-or-ceiling footprint, and only occupies one (1)address on the signal-line circuit(SLC). Model HI921 can be applied within the maximum 50-feet (15.24 m.) center spacing (2,500 sq. ft. [232.3 sq. mJ) per Underwriters' Laboratories. This application guide is based on ideal conditions, specifically, smooth-ceiling surfaces, minimal air movement, and no physical obstructions between potential fire sources and the actual detector. Do not mount detectors in close proximity to heating I ventilation I air-conditioning (HVAC) outlets. Exposed joists or beamed ceilings may also affect safe spacing limitations for detectors. Should questions arise regarding detector placement, observe NFPA 72 guidelines. Good fire-protection system engineering and common sense dictate how and when fire detectors are installed and used. Contact your local Siemens - Fire Safety distributor or sales office whenever you need assistance applying Model HI921 in unusual applications. Be sure to follow NFPA guidelines and UL Listed I ULC Listed installation instructions-included with every Siemens-Fire Safety detector-and local codes for all fire-protection equipment. Specifications Model HI921 is a plug-in, (2) two-wire thermal (heat) detector, compatible with Cerberus PRO Modular I FireFinder XLSIV and Model FC9-series FACPs. Each Model HI921 detector has microcomputer-chip technology and highly stable, solid-state electronic circuitry. Model HI921 detectors utilize a modern, accurate and shock-resistant thermistor to sense temperature changes. This electronic-sensing method virtually eliminates thermal lag associated with mechanical temperature-sensing devices and provides almost instantaneous temperature status to the FACP. Model HI921 provides seven (7)field-selectable, pre-programmed temperature settings: Fixed Temperature set points(5) Rate of Rise set points(2) • Fixed 135°F(57°C) • Rate-of-Rise: 15°F I min. (8.3°C)at fixed 135°F(57°C) • Fixed 145°F(63°C)• Fixed 155°F(68°C) • Rate-of-Rise: 15°F I min. (8.3°C)at fixed 175°F(79°C)——— • Fixed 165°F(74°C) • Fixed 175°F(79°C) Additionally,the Model HI921 detector has the following optional feature: • Model HI921 provides indication of potential water freezing for sprinkler systems, via configuration for reporting a low-temperature warning of 407(4.4°C). This feature is compatible with Cerberus PRO Modular systems, as well as with FireFinder XLSIV and Cerberus PRO FCIFV922 or FCIFV924 FACPs. Mounting Diagrams �o----------4.13" (10.5 --------------- ------- ------- I D t4.4 CM.I i i i I i Siemens usa.siemens.comlfire Smart Infrastructure - Building Products -3-