Bosch D296 Installation Instructions Manual page 10

D296/D297 | Installation Instructions |
7.5 Remote Test Indicator Plate
Connector
1. Momentarily attach the connector's orange and
black leads to produce a Test alarm (refer to
Figure 16).
Figure 16: Remote Indicator Plate Connector
1 - Remote Alarm Test (orange wire)
2 - Analog reference voltage out (blue wire)
3 - Common (-) (black wire)
4 - Red LED (red wire)
5 - Yellow LED (yellow wire)
6 - Green LED (green wire)
2. For a Remote Test, install a momentary switch
between the orange and black wires.
3. Connect the black and blue wires to an analog
meter for reference voltage measurements.
4. Connect the red, yellow, and green wires to remote
LEDs.
Each lead wire is current limited to a maximum of
10.0 mA DC.
7.6 Smoke Density and Obscuration
The total obscuration of the infrared beam depends on
the density and width of the smoke cloud along the
beam path. As the width of the smoke cloud increases,
less dense smoke is needed for an equal obscuration of
the beam path. Assume the smoke cloud is the entire
distance of the beam path. Select the total obscuration
needed for an alarm by setting the Sensitivity Pot
according to Section 6.2 Sensitivity Adjustment on page 8.
Total beam obscuration by smoke increases with the
distance between detectors; there is more smoke within
the beam path. Therefore, you can lessen detector
sensitivity by increasing the distance. Detector
sensitivity is also less at greater distances because
obscuration by other contaminants, such as dust,
increases.
Set detector sensitivity to respond to the proper smoke
obscuration and to reduce the chance of a false
activation.
10
7.0 Additional Information
1
2
3
4
5
6
For example, if the expected smoke density is
0.5%/ft (0.5%/30 cm), the obscuration at 50 ft (15 m) is
20%. The obscuration at 250 ft (95 m) is 73% (refer to
Figure 17).
Figure 17: Smoke Density and Obscuration Chart
1 - Smoke density
2 - UL minimum sensitivity
3 - UL maximum sensitivity
4 - Distance between transmitter and receiver
Refer to Table 4 for the sensitivity pot settings, total
obscuration, needed for an alarm.
Table 4: Sensitivity Pot and Obscuration
Sensitivity Pot Setting
2
0 or 3
4
5
1 or 6
7
Bosch Security Systems, Inc. | 09/06 | 31344F
Total Obscuration at Alarm
20%
30%
40%
50%
60%
70%