4 when installing on the return side install duct units prior.
Duct smoke detector installation instructions.
With the air handler on measure the air velocity with an anemometer.
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.
Do not overtighten the screws.
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.
To ensure correct operation install the duct detector using the following guidelines.
Smoke introduced into an air duct system will be distributed throughout the entire building.
Install the duct smoke detector on a flat section of hvac duct between six and ten duct widths from any bends or obstructions.
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.
Installation instructions for duct smoke detectors mounted on combination fire smoke or smoke dampers ii detector 04 12.
6 sampling tube installation ing out of the duct select a shorter tube using 6 1 sampling tube selection.
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.
Duct smoke detection can also serve to protect the air conditioning system itself from fire and smoke damage.
Duct smoke detection may be useful in preventing injury and property dam age in instances such as the following.
The duct smoke detector is equipped with an auxiliary relay.
Model d4120 and d4s duct smoke detectors utilize 4 wire photoelectric tech nology for the detection of smoke.
Consult nfpa 90a nfpa 72 and local codes to determine where smoke detectors are required.
Once the airflow direction has been determined insert the inlet and exhaust tubes into the duct smoke detector.
Refer to the applicable figures below depending on your duct housing model number.
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.
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 hole 3 feet upstream from the duct smoke detector.
With all wiring in place install the detector head.
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.
With power source de energized and the smoke detector not installed wire all connections per engineering drawings.
2 6 p n 3101210 rev 02 iss 28jan13.
The ad2 series smoke duct detector should be greater than 0 01 inches of water and less than 1 2 inches of water.
