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D340 | Installation Guide | 8.0 Installation Testing
8.0 Installation Testing
Verify the air flow 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/sec to 20 m/sec).
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. Check the wiring from the control panel to the
last duct detector on each run for proper
polarity and continuity.
2. Ensure each run terminates with an EOL
resistor as specified by the control panel
manufacturer.
3. Apply power to the system, and check for
alarms.
a.
Note which smoke detectors are in alarm (if
any) and shut down the system.
b. 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.
c.
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.
4. 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.
5. 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:
a.
Place an SMK-TM magnet against the duct
housing's Test Point notch on the front
cover (Figure 27).
b. Switch a signal from a D344-RT (D307)
Remote Test Indicator Plate.
When a detector alarms, the red LED
indicator activates and latches to the ON
position. Clear the alarm before proceeding
to the next detector.
6. You can reset the detector by momentarily
removing power.
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7. For duct detectors with the D307 Remote Test
Indicator installed, reset by moving the
keyswitch to the appropriate position and
observing the alarm LED.
Figure 27: Detector Testing
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2
1 - D340 Duct Smoke Detector Housing
2 - Test point notch
3 - SMK-TM magnet
8. Check the overall loading of the alarm loop by
measuring the voltage across each EOL resistor.
This voltage should equal or exceed the
minimum specified by the control panel
manufacturer.
9.0 Maintenance
NFPA-72 requires a semi-annual visual
inspection of detector housings. Clean or
replace the tube filters at this time. If
replacement filters are needed, order the
D344-TF.
Notify all concerned parties before and
after maintaining or testing the fire alarm
system.
Clean the detector and base annually using a
vacuum or clean and dry compressed air.
Bosch Security Systems, Inc. | 7/09 | F01U071685-06
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