Smoke Alarm User Manual

Installation, Operation and Maintenance Manual
Page 8-6 Issue 1
February 2001
Table 8.5 Faults Indicated on the Display Module or LaserNET Graphic Display
Faults Indicated on the LaserNET Graphic Display
Display Module or LaserNET
Graphic Display Message
Indication Corrective Action
1. Check connections at the termination board.
2. Clean the detector head.Detector Fault
Detector Head
Trouble
3. If steps 1 and 2 do not resolve the problem,
return the detector to the supplier.
1. Check that no ambient light is penetrating the
pipe and entering the detection chamber.
This can happen in brightly lit areas,
especially when white PVC is used as the
sampling pipe.
2. Disconnect the sampling pipe and connect an
absolute filter to the Detector. If the smoke
deflection goes to zero, there is particulate in
the sampled area. If not proceed.
3. Clean the detector head.
Full-Scale deflection for no
apparent reason
No specific
event is logged
for this fault
4. If steps 1 to 3 do not resolve the problem,
return the unit to the supplier.
1. Check the real-time airflow level (See
LaserNET manual). Ensure that the airflow
thresholds are set according to the manual.
2. Check for proper operation of the Fan
Module.
3. Check for blockages or breaks in the
sampling pipe network.
Airflow Fault
Low or High
Airflow Level
4. Check for rapid temperature fluctuations in
the protected area. If found, widen the
airflow thresholds.
1. Measure the output voltage of the supply. It
must be above 24 V DC.
2. Check the power supply fault lights (only if
powered by stand-alone power supply).
Check the indicated circuit as described in
steps 4 to 7 below.
3. Check the connections and continuity of the
wires connected between the power supply
and the termination board.
Power Supply Fault PSU Trouble
4. Check that the AC voltage at the power
supply input terminals is within operating
range.