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 detector installed.
Nfpa 90a requires the first duct smoke detector to be installed on the supply side of air handler units of more than 2 000 cubic feet per minute cfm and requires one on the return side of units of more than 15 000 cfm and serving more than one story.
Sensor power board assembly and cover s 2.
One plastic exhaust tube note.
4 contents of the duct smoke detector kit 1.
The international mechanical code imc specifies that if the space is air conditioned and the a c unit is over 2 000 cfm a duct smoke detector is required to be installed in the return air duct.
With all wiring in place install the detector head.
Install supply side detectors at a point downstream from the supply fan and after the air filter.
Duct detectors smoke detection installation furthermore intentions for using duct smoke detectors should not be a substitute for area smoke detectors.
Innovairflex duct smoke detectors combine an impressive collection of innovations to greatly simplify hvac system monitoring.
Install return side detectors at a point before the return air stream is diluted by outside air.
One sampling tube end cap 5.
Nor should it serve as an early warning detection system.
Tool free plug in sampling tubes speed and simplify installation.
A sampling tube must be ordered to complete the installation.
Duct smoke sensors are made to detect early smoke or combustion particles present in the air travelling through hvac passways.
Refer to the applicable figures below depending on your duct housing model number.
The air handling system which is installed in these sensors block the recirculation of smoke in such areas.
Hvac duct smoke detection.
Three 10 sheet metal screws for mounting 3.
Energize the duct detector.
With power source de energized and the smoke detector not installed wire all connections per engineering drawings.
One unit can accommodate multiple installation footprints to overcome mounting constraints.
It must be the correct length for the width of the duct where it will be installed.
