8407 BROADWAY 2024-11-12 - Laserfiche WebLink

Application Installation of Model FDT421 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 FDT421 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 FDT421 can be applied within the maximum 50-feet (15.24 m.) center spacing (2,500 sq. ft. [232.3 sq. m.1) 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 FDT421 in unusual applications. Be sure to follow NFPA guidelines and UL Listed 1 ULC Listed installation instructions included with every Siemens- Fire Safety detector-and local codes for all fire-protection equipment. Specifications FDT421 is a plug-in, (2) two-wire thermal (heat) detector, compatible with Desigo Modular I FireFinder XLSIV and Model FC20-series FACPs. Each Model FDT421 detector has microcomputer-chip technology and highly stable, solid-state electronic circuitry. Model FDT421 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 FRCP. Model FDT421 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 FDT421 detector has the following optional feature: • Model FDT421 provides indication of potential water freezing for sprinkler systems,via configuration for reporting a low-temperature warning of 40°F(4.4°C). This feature is compatible with Desigo Modular systems,as well as with FireFinder XLSIV and Desigo FCIFV2025 or FCIFV2050 FACPs. Mounting Diagrams Dimensions 6�o----------4.1 3" (10.5 i {4.9 CM. [ {3.7CM.I i i Siemens Smart Infrastructure - Building Products —3— usa.siemens.comlfire