SuperDuct Four-Wire Duct Smoke Detector - UTCFS Global Security ...

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Related documentsIn addition to this document, important information regardingthe proper installation and maintenance of SuperDuct ductsmoke detectors is provided in the following standards:• NFPA 70 National Electrical Code• NFPA 72 National Fire Alarm Code• NFPA 90A Installation of Air Conditioning andVentilating Systems• UL 268A Smoke Detectors for Duct Applications• ULC 529 Smoke Detectors for Fire Alarm Systems• NEMA Guide for Proper Use of Smoke Detectors in DuctApplicationsDuct smoke detector limitationsSuperDuct duct smoke detectors will not operate withoutelectrical power.SuperDuct duct smoke detectors will not operate as designedoutside of the listed electrical and environmentalspecifications.SuperDuct duct smoke detectors will not sense smoke unlessthe ventilation system is operating and the sensor’s cover isproperly installed.SuperDuct duct smoke detectors may not operate as designedunless the duct detector is installed in accordance with theseinstructions and all applicable national and local codes asdetermined by the local authority having jurisdiction.Product descriptionOverviewSuperDuct four-wire duct smoke detectors are used to detectsmoke under extended temperature ranges in self-containedcommercial HVAC units, such as those typically found onbuilding rooftops. In self-contained commercial HVAC units,the HVAC equipment is enclosed in a single package toprotect the internal components (compressor, condensing unit,heating coils, etc.) from adverse environmental conditions.Hinged or removable service panels provide access to theequipment.WARNING: SuperDuct duct smoke detectors are not intendedas a substitute for open area protection.The SuperDuct duct smoke detector (see Figure 1) comprises acontroller and one or two sensors. Its primary function is toprovide early warning of an impending fire and shut down theHVAC unit in order to prevent smoke from circulatingthroughout the building. It is typically used to detect smoke inthe supply side of the HVAC system but can providesupervision of the return side as well.Note: Install supply-side sensors at a point downstream fromthe supply fan and air filters and return-side sensors at a pointbefore the return air is diluted by outside air.ExhaustOutsideairDamperFanPowerdistributionpanelTest/resetstationRooftop HVAC unitFilterSmokesensorFanControllerCO2sensorCoilSmokesensorReturnairHVACcontrolsFigure 1: Duct smoke detector application diagramNext controllerFACPSupplyairCO2sensor outputThe controller is designed for multiple operating voltages andprovides relay contacts for connection to fire alarm systems,HVAC controls, and other auxiliary functions. It can beattached to a sensor and installed as a single unit or it can beinstalled separate from the sensor. In installations where theduct smoke detector’s controls and indicators are hidden fromview, a remote test/reset station can be connected to thecontroller to provide these functions.Note: In installations using two sensors, the duct smokedetector does not differentiate which sensor signals an alarmor trouble condition.The sensor uses a process called differential sensing to preventgradual environmental changes from triggering false alarms. Arapid change in environmental conditions, such as smoke froma fire, causes the sensor to signal an alarm state but dust anddebris accumulated over time does not. When the sensor’sability to compensate for environmental changes has reachedits limit (100% dirty), the sensor signals a trouble condition.Air is introduced to the duct smoke detector’s sensingchamber through a sampling tube that extends into the HVACTechnical Bulletin2 SuperDuct Four-Wire Duct Smoke Detector
duct and is directed back into the ventilation system throughan exhaust tube. The difference in air pressure between thetwo tubes pulls the sampled air through the sensing chamber.When a sufficient amount of smoke is detected in the sensingchamber, the sensor signals an alarm state and the controllerautomatically takes the appropriate action to shut down fansand blowers, change over air handling systems, notify the firealarm control panel, etc.Caution: Excess temperature differentials between theambient air and the sampled air can produce unwantedcondensation inside the sensor, which may cause the sensor tofunction improperly. Precautions should be taken to limit thetemperature range and the amount of condensation to whichthe sensor is exposed.Sensor descriptionThe sensor (see Figure 2) comprises a plastic housing, aprinted circuit board, a clear plastic cover, an exhaust tube,and a sampling tube. The exhaust tube and sampling tube areattached during installation. The sampling tube is orderedseparately and varies in length depending on the size of theHVAC duct.The clear plastic cover permits visual inspections withouthaving to disassemble the sensor. The cover attaches to thesensor housing using four captive screws and forms an airtightchamber around the sensing electronics.Exhaust tubeExhaust gasketSensor housingand electronicsSeeDetail AIntakegasketCover gasket(ordering option)PlugTSD-CO2(ordering option)Sensor coverSampling tube(ordered separately)Detail ACouplingFigure 2: Four-wire smoke sensor exploded view (RJ-45 version)Technical BulletinSuperDuct Four-Wire Duct Smoke Detector 3
Page 1: SuperDuct Four-Wire Duct SmokeDetec
Page 5 and 6: Sensitivity: 0.67 to 2.46 %obscurat
Page 7 and 8: When one of the duct smoke detector
Page 9 and 10: No. Name No. NameNote: High voltage
Page 11 and 12: TroubleshootingController’s Troub
Page 13 and 14: 1.3755.40014.5113.9513.552.721.9005
Page 15 and 16: 1st sensorCategory 5TB1cable [8]TB4

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