Do not overtighten the screws.
Duct smoke detector installation instructions.
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.
Smoke introduced into an air duct system will be distributed throughout the entire building.
With the air handler on measure the air velocity with an anemometer.
This detection method when combined.
Energize the duct detector.
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.
4 when installing on the return side install duct units prior.
Duct smoke detection can also serve to protect the air conditioning system itself from fire and smoke damage.
Installation instructions for duct smoke detectors mounted on combination fire smoke or smoke dampers ii detector 04 12.
The ad2 series smoke duct detector should be greater than 0 01 inches of water and less than 1 2 inches of water.
The sl 2000 series duct smoke detector provides a unique patent pending mechanism for installation and or removal of the sampling and exhaust tubes from either the front or rear of the detector housing.
To ensure correct operation install the duct detector using the following guidelines.
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.
The duct smoke detector is equipped with an auxiliary relay.
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.
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.
Model d4120 and d4s duct smoke detectors utilize 4 wire photoelectric tech nology for the detection of smoke.
Install the duct smoke detector on a flat section of hvac duct between six and ten duct widths from any bends or obstructions.
With power source de energized and the smoke detector not installed wire all connections per engineering drawings.
Duct smoke detection may be useful in preventing injury and property dam age in instances such as the following.
6 sampling tube installation ing out of the duct select a shorter tube using 6 1 sampling tube selection.
With all wiring in place install the detector head.
4 hole 3 feet upstream from the duct smoke detector.
Smoke detectors designed for use in air duct systems are used to sense the presence of smoke in the duct.
