Duct Smoke Detector Connection

E pdd duct smoke detector installation sheet operation the duct smoke detector s primary purpose is to provide early warning of an impending fire and shut down the hvac unit in order to prevent smoke from circulating throughout the building. Duct detectors aren t a replacement for room sensors. Furthermore intentions for using duct smoke detectors should not be a substitute for area smoke detectors.

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Assortment of duct smoke detector wiring diagram.

Duct smoke detector connection. Duct smoke detector the innovairflex series are the only duct smoke detectors flexible enough to fit configurations from square to rectangular and everything in between. Nor should it serve as an early warning detection system. The duct smoke detector is designed for use in duct. How to installation air duct smoke detector.

Air enters the detector s sensing chamber through a sampling tube ordered separately that extends into the duct and is directed back into the ventilation system through an exhaust tube. The detector assembly cover provides easy access to the smoke sensor its wiring connections sample and exhaust tube fittings and the smoke chamber itself. Nfpa 72 also states that a duct smoke detector is not allowed to replace an area smoke detector mainly because if the air handling unit ahu is not running the detector would not detect smoke. If the duct system is designed to carry more than 2000 cfm 5 tons nominal of air you need one in the return if imc is being followed and the supply if nfpa is being followed.

Duct smoke detection equipment a duct smoke detector is a device or group of devices used to detect the presence of smoke in the airstream of ductwork sections of the hvac air handling systems typically used in commercial buildings. Typical smoke detection devices used for duct application include smoke detector sensors within a housing mounted. A duct smoke detector should shut off a typical blower and fresh air and turn on the exhaust. It reveals the elements of the circuit as streamlined shapes and also the power and also signal connections between the devices.

Features 4 wire photoelectric integrated low flow technology air velocity rating from 100 ft min to 4 000 ft min 0 5 m s to 20 32 m sec. Therefore duct smoke detectors are typically considered mechanical equipment devices instead of life safety devices. A wiring diagram is a simplified traditional photographic depiction of an electric circuit. Therefore they should complement the buildings fire detection system and not serve as the primary fire detection system.

Install the duct smoke detector on a flat section of hvac duct between six and ten duct widths from any bends or.