Duct Smoke Detector Installation Detail

Air is introduced to the duct smoke detector s sensing chamber through a sampling tube that ext ends into the hvac duct and is directed back into the ventilation system through an exhaust tube.

Duct smoke detector installation detail.

This photoelectronic detector mounts externally to the duct with intake and exhaust sampling tubes penetrating into the duct. Variety of duct smoke detector wiring diagram. When sufficient smoke is sensed an alarm signal is initiated and appropriate action can. The difference in air pressure between the two tubes pulls the sampled air through the sensing chamber.

It shows the components of the circuit as streamlined shapes as well as the power as well as signal links between the gadgets. Installation position for an fdbz492 pr duct smoke detector the following factors must be considered. The sampling tubes may be ordered to a desired length or ordered in one of 3 standard lengths and cut per requirements. Model d4120 and d4s duct smoke detectors utilize 4 wire photoelectric technology for the detection of smoke.

1 a uniform non turbulent laminar airflow between 100 ft min. This detector is recommended for ducts 6 inches and wider with duct velocities within the 500 fpm to 4000 fpm range. Duct detectors smoke detection installation furthermore intentions for using duct smoke detectors should not be a substitute for area smoke detectors. This detection method when combined.

The intake sampling tube consists of a piece of steel piping with a series of holes drilled the entire length of the tube and should extend the entire width of the duct. Typical smoke detection devices used for duct application include smoke detector sensors within a housing mounted outside the duct utilizing sam. Model d4120 and d4s duct smoke detectors utilize 4 wire photoelectric tech nology for the detection of smoke. Therefore they should complement the buildings fire detection system and not serve as the primary fire detection system.

This detection method when com bined with an efficient housing samples air passing through the duct al lowing detection of a developing hazardous condition. 5 4 secure the duct detector to the duct use two rectangular configuration or three square configuration of the pro vided sheet metal screws to screw the duct detector to the duct. Smoke detectors designed for use in air duct systems are used to sense the presence of smoke in the duct. Nor should it serve as an early warning detection system.

Do not overtighten the screws. 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. 6 sampling tube installation ing out of the duct select a shorter tube using 6 1 sampling tube selection.