Duct Smoke Detector Installation Instructions

Model d4120 and d4s duct smoke detectors utilize 4 wire photoelectric tech nology for the detection of smoke.

Duct smoke detector installation instructions.

With power source de energized and the smoke detector not installed wire all connections per engineering drawings. Install the duct smoke detector on a flat section of hvac duct between six and ten duct widths from any bends or obstructions. Duct smoke detection may be useful in preventing injury and property dam age in instances such as the following. Refer to the applicable figures below depending on your duct housing model number.

With all wiring in place install the detector head. Do not overtighten the screws. To verify correct installation the pressure differential between the sampling high side and exhaust low side tubes should be measured using a magnehelic pressure gauge or equivalent. A heating ventilating or air conditioning hvac fan motor overheats and resulting smoke is sensed by the duct smoke detector installed in the main supply duct.

With the air handler on measure the air velocity with an anemometer. 4 hole 3 feet upstream from the duct smoke detector. 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.

4 when installing on the return side install duct units prior. If the air speed is greater than 500 fpm use a conventional manometer to measure differ ential pressure between the sampling tubes as described in 8 2 1. 2 6 p n 3101210 rev 02 iss 28jan13. 3 identify a code compliant location supply or return side or both for the installation of the duct unit that will permit easy access for viewing and serviceability.

Energize the duct detector. Duct smoke detection can also serve to protect the air conditioning system itself from fire and smoke damage. This detection method when combined. The duct smoke detector units are designed to operate in duct widths from 6 to 10 wide with an air velocity between 500 to 4 000 feet per minute.

Installation instructions for duct smoke detectors mounted on combination fire smoke or smoke dampers ii detector 04 12. To ensure correct operation install the duct detector using the following guidelines. 6 sampling tube installation ing out of the duct select a shorter tube using 6 1 sampling tube selection. The ad2 series smoke duct detector should be greater than 0 01 inches of water and less than 1 2 inches of water.

Once the airflow direction has been determined insert the inlet and exhaust tubes into the duct smoke detector. Consult nfpa 90a nfpa 72 and local codes to determine where smoke detectors are required.