16
•
NON-FUNCTIONAL
-
If the detector is less sensitive than the minimum
allowable sensitivity, the visible LED does not flash normally. When in
MAG TEST, the visible LED slowly flashes four times, once every two
seconds. After the fourth flash, the detector does NOT latch into alarm and
the LED stops flashing and turns OFF.
If the detector is out of the normal operating range, it should be cleaned. If the
detector still indicates as other than normal sensitivity, replace the detector.
NFPA requires annual testing of the detectors at their installed location using
smoke or aerosol. With the air handling unit turned on, open one of the test port
holes (Figure 13) by removing the red cover on the duct detector housing. Using
the extended nozzle on the smoke detector aerosol tester (553-673) spray a
4-second burst of aerosol through the test port but not directly at the detector
head. The nozzle of the smoke detector aerosol tester should not extend beyond
the inlet tube (see Figure 13). Aerosol is sprayed into the stream of incoming air
and not directly into the detector.
IMPORTANT:
Make sure the test port covers are replaced after testing.
Figure 13. Smoke Detector Aerosol Test
Continued on next page
Installation,
Continued
Magnetic Test for
Photoelectric Detectors,
(continued)
Preferred Method of Testing
Smoke Detectors/Sensors
SMOKE PORT/AIR
FLOW TEST HOLE
SMOKE DETECTOR
AEROSOL TESTER
(553-673)
RECOMMENDED NOZZLE
LOCATION
(CENTER OF INLET TUBE)
INLET TUBE
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