22
When placing the magnet near the location (see Figure 16) indicated by a
“TEST” mark embossed on the cover, the visible LED flashes indicating the
detector's condition. The following are descriptions of what you should see
when using the MAG TEST.
• NORMAL - When in MAG TEST, the detector latches into alarm if the
detector is within calibration range and the visible LED stays ON.
• MORE SENSITIVE - When in MAG TEST, if the detector is more
sensitive than the maximum calibration, the visible LED quickly flashes,
twice a second. Following the sixth flash, the detector latches into alarm
and the visible LED stays ON.
• LESS SENSITIVE - When in MAG TEST, if the detector is less sensitive
than the minimum calibration, the visible LED slowly flashes four times,
once every two seconds. Following the fourth flash, the detector latches
into alarm and the visible LED stays ON.
• 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/sensors at their installed location
using smoke or aerosol. With the air handling unit turned on, open one of test
port holes (Figure 1) by removing the red cover on the duct detector/sensor
housing. Using an 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/sensor head. The nozzle of the smoke detector aerosol tester
should not extend beyond the inlet tube (see Figure 17). Aerosol is sprayed into
the stream of incoming air and not directly into detector/sensor.
IMPORTANT: Make sure the test port covers are replaced after testing.
Figure 17. Smoke Detector Aerosol Test
Continued on next page
Installation, Continued
Magnetic Test for Detectors
and Sensors (continued)
Preferred Method of Testing
Smoke Detectors/Sensors
SMOKE PORT/AIR
FLOW TES
HOLE
SMOKE DETECTOR
AEROSOL TESTER
(553-673)
RECOMMENDED NOZZLE
LOCATION
(CENTER OF INLET TUBE)
INLET TUBE
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