How do you test duct detectors?
How do you test duct detectors?
Spray aerosol smoke* into the duct through the ΒΌ inch hole for five seconds. Wait two minutes for the duct smoke detector to alarm. If the duct smoke detector alarms, air is flowing through the detector.
What does a duct detector do?
A duct smoke detector is a device or group of devices used to detect the presence of smoke in the airstream of ductwork sections of the HVAC air handling systems typically used in commercial buildings.
How do you test a duct detector with a magnet?
Hold the magnet in place for 5-10 seconds until the alarm goes off. Keep the magnet still and wait 5-10 seconds. If the detector is working properly, the magnet will trick the magnetic reed inside of the sensor to trigger and the beeping alarm sound should fire. If it does, your detector is operating correctly.
Do duct detectors need to be monitored?
Bottom line is if a building fire alarm system is not installed, duct smoke detectors shall be stand alone and are not required to be connected/monitored by a dedicated function fire alarm system.
How do you clean a duct sensor?
To clean the duct smoke detector: Remove the detector’s cover then power down the detector by disconnecting the initiating device circuit wiring. 2. Using a vacuum cleaner, clean compressed air, or a soft bristle brush, remove loose dirt and debris from inside the detector housing and cover.
Do duct detectors go on supply or return?
NFPA 90A requires duct detectors to be installed on the supply side of air handler units with airflows of more than 2,000 cubic feet per minute (cfm). The standard also requires a duct detector on the return side of any unit with air flows exceeding 15,000 cfm and which serve more than one floor of a building.
Where are duct detectors located?
Duct detectors located on the return side and upstream of any filters or introduction of outside air detect smoke coming from an air conditioned space.
How do you clean a duct detector?
How to clean your smoke detectors
- Make sure to never submerge any part of the smoke detector in water.
- Don’t use any type of liquid cleaning chemicals.
- Wipe the entire outside with a microfiber cloth.
- Be sure the air vents are well cleaned for good air flow.
How do you reset a simplex duct detector?
If an alarm is detected, the on-board relay contacts transfer, the control station tone-alert sounds, and the alarm LED illuminates. Activating the Silence switch will silence the tone-alert. After the source of the alarm is located and resolved, turning the key switch to Test/Reset will reset the detector.
Are duct detectors required on exhaust fans?
Where Are Duct Smoke Detectors Required? Duct smoke detectors are required for HVAC systems with airflows exceeding 2,000 cubic feet per minute (cfm), including settings where multiple air handling systems share ducts if the combined design capacity is greater than 2,000 cfm.
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