Duct smoke detector installation guide

To verify correct installation, the pressure differential between. Air Products and Controls assumes no responsibility for improperly installed duct detectors.

To determine the correct installation position for an SM Series duct smoke detector, the following factors must be considered. To determine duct velocities, examine the engineering specifications that define the expected velocities or use an Alnor model AP velocity meter or equivalent.

The pressure differential between the input sampling high pressure tube and exhaust low pressure tube for the SM Series smoke duct detector should be greater than 0. Standard sampling tubes are steel tubes with air intake holes drilled the entire length of the tube.

These tubes must be cut to length and should span the entire width of the duct. Sampling tubes over 3. To ensure the correct operation of the sensing tube, the red end cap red stopper in installation kit must be inserted in the end of the air intake sampling tube. For custom duct widths, always use the next longest standard size and cut down to the exact requirement. Once the airflow direction has been determined, insert the inlet and exhaust tubes into the sampling tube connectors fitted to the back of the duct smoke detector which are equipped with set screws.

These connectors will allow the tubes to be correctly orientated and secured by tightening the set screw. Ensure air intake sampling tube is positioned so that the inlet holes are directly facing the airflow. Remove mounting template from the installation kit. Remove paper backing from the mounting template and affix it to the duct at the desired location.

Clean all holes. To ensure correct operation of the duct unit use a Magnehelic differential pressure gauge, Dwyer or Series or equivalent to determine the differential pressure between the inlet high side and exhaust low side tubes.

The differential pressure between the two tubes should be greater than 0. Welcome to ManualMachine. We have sent a verification link to to complete your registration. Log In Sign Up. Forgot password? Enter your email address and check your inbox. Please check your email for further instructions.

Enter a new password. Apollo America. The trouble contact. The trouble contact will not. The Firex Duct Detector models and will operate on one of the following input voltage sources: 24V.

The duct smoke detector units are designed to operate in duct widths from 12 inches to 10 feet wide with an air velocity between and T o verify correct installation, the pressure differential between the input and exhaust tubes should be. An acceptable reading must be between 0.

For a Smoke Duct Detector unit to operate correctly , it must be installed 6 duct widths from any obstruction i. In situations where the criteria cannot be met, deviations are acceptable providing they meet the pressure diffe rential.

The principal of operation of a duct detector is based on the V enturi ef fect. T wo tubes extend into the HV AC duct. Air flowin g through the duct. The air will be drawn out via the exhaust tube back. When the particles of smoke suspended in the air stream reach the alarm threshold of the detector head, the unit will go into a larm.

Firex Duct units by connecting to the D.