Intelligent Products—DH500 Series Intelligent Air Duct Smoke Detector 21
Testing and Maintenance
Procedures
Before testing or maintenance of detectors, notify the proper authorities
that the smoke detector system is undergoing maintenance and will be
temporarily out of service.
After a detector is set into alarm by one of the following test methods, and
the alarm activating device is removed from the detector, the system
should be reset at the control panel before testing any additional detectors.
After all maintenance and testing is complete, notify the proper authorities
that the system is back in service.
To verify sufficient sampling of ducted air:
1.
Use a manometer to measure the differential pressure created from
air flow across the sampling tubes.
2.
Verify that the pressure measures no less than 0.01 inches of water
and no greater than 1.20 inches of water.
To determine that smoke is capable of entering the sensing chamber:
1.
Conduct a visual examination.
2.
Note any obscurations around the sensing chamber.
3.
Check to see if a smoke test is required. If it is, blow cigarette,
cotton wick, or punk smoke directly at the smoke detector head.
It is important to plug the exhaust and sampling tube hole to prevent
ducted air from blowing smoke away from the smoke detector head.
4.
Record all test records in the Detector Test Log section in this
technical bulletin.
Note: Remove the plugs after testing or the detector will not sense smoke
in the air duct.
Testing
Air Flow
