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Duct smoke housing, 2-wire
5
Testing and maintenance
5.1
Testing the installation
Verify the airflow to ensure the system is properly operating. Use a manometer to verify the
correct velocity pressure readings ranging from 300 ft/min to 4000 ft/min (1.5 m/s to 20 m/s).
The pressure differential between sampling tubes is a minimum of 0.01 in. (0.25 mm) of water
to a maximum of 1.8 in. (45.7 mm) of water.
1.
2.
3.
4.
5.
Figure 5.1: Testing the detector
Bosch Security Systems, Inc.
Check the wiring from the control panel to the last duct detector on each run for proper
polarity and continuity.
Ensure each run terminates with an EOL resistor as specified by the control panel
manufacturer.
Apply power to the system, and check for alarms.
Note which smoke detectors are in alarm (if any) and shut down the system.
Remove these detectors from their duct housing and recheck the duct housing for proper
wiring. If the problems persist, replace the affected smoke detectors or swap them with
known good units. This determines if the problem is caused by the detector or the duct
housing.
If there is a system alarm with no detector alarms present, remove all smoke detectors
and check the wiring at each duct housing. Pay close attention to the wiring of each EOL
resistor.
When the system is free of alarms, check each detector to ensure the red LED indicator
flashes approximately every 4 sec for the D285DH. This verifies the detector is receiving
power and properly operating.
Test each detector to ensure it causes a control panel alarm. Reset the control panel after
each test. Test the detectors by doing one of the following:
Place a magnet against the duct housing's test point notch on the front cover (see the
following figure).
1 Magnet
3 Detector
2 Test point notch
4 Housing
Installation manual
Testing and maintenance | en
2017.04 | 7.0 | F.01U.071.685
19
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