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F220 Series Detectors with F220-B6/C/E/R Bases Install the Detector Heads | en 21
Bosch Security Systems, Inc. Installation Manual 4998138694 -04 | 2007.01
4.2 Set Detector Modes
The F220 Series Smoke Detectors feature a unique
magnet-operated sensitivity mode and detector test mode.
4.2.1 Test Mode
Test the detector by placing the magnet next to the T mark on
the mounting skirt (refer to Figure 4.2, Item 8 on page 19) for
three consecutive flashes to cause an alarm.
4.2.2 Sensitivity Mode
If the magnet is next to the T mark for less than three flashes
but more than one flash, the detector enters Sensitivity Mode.
1. Place the detector into Sensitivity Mode.
2. Wait for the first single green LED flash.
3. Count the number of red LED flashes that follow and refer
to Table 4.1 for sensitivity definitions.
4. The detector exits sensitivity mode and returns to one
green LED flash every eight seconds.
Number of
Red Flashes
Sensitivity Definition (% Obscuration)
1 Malfunctioning smoke or heat detector
3 Normally operating smoke or heat detector with
little or no dirt contamination
4 to 6 Progressively more contamination
7 to 10 Trouble condition, very dirty but still
compensated to 3%/ft (3%/ft = 0.433 db/m);
Sensitivity < 3%/ft at 10 flashes.
11 Sensitivity < 2.5%/ft (2.5%/ft = 0.36 db/m)
12 Sensitivity < 2.0%/ft (2.0%/ft = 0.287 db/m),
chance of false alarm increases
13 Sensitivity < 1.5%/ft (1.5%/ft = 0.214 db/m)
14 Sensitivity < 1.0%/ft (1.0%/ft = 0.143 db/m),
chance of false alarm greatly increases
15 Sensitivity < 0.5%/ft (0.5%/ft = 0.071 db/m),
false alarm likely
Table 4.1 Red LED Flash Definition
4998138694Er7.book Page 21 Thursday, March 1, 2007 8:42 AM