Smoke Alarm User Manual

Installation, Operation and Maintenance Manual
Page 8-4 Issue 1
February 2001
Table 8.3 General System Faults
General System Faults
Symptom Corrective Action
1. If the system is new, ensure that the actual pipe network system
corresponds with the layout as calculated by the “SNIFF” design
software. Items such as pipe diameters, elbows, sampling hole diameter
and junction configurations should be checked.
2. Check for proper operation of the Fan module.
3. Check the screens located inside the detector head chamber and
Elutirator. Clean if required.
4. Check for broken pipes, loose joints, leaky junction boxes, or missing
pipe caps.
Low Suction Pressure
5. Check for blockages within the pipes. The blockage can be located by
checking the suction pressure at points closest to the detector head(s)
and working outward. The suction pressure will drop downstream from
the blockage.
1. If the system is new, ensure that the actual piping system corresponds
with the layout as calculated by the “SNIFF” design software. Items
such as pipe lengths, pipe diameters, elbows, sampling hole diameters
and junction configurations should be checked.
High Suction Pressure
2. Check for blockages within the pipes and blockage of sampling ports.
Pipe blockage can be located by checking the suction pressures on the
points closest to the detector head(s) and working outward. The suction
pressures will be higher upstream of the blockage.
Long Transport Times 1. Perform checks as outlined for low suction pressure
1. Perform the sensitivity test by selecting the “sensitivity test” option from
the LaserNET graphic display’s options menu. See LaserNET Manual,
LaserNET will either PASS or FAIL.
Low Sensitivity to
Smoke
2. Perform checks as outlined for low suction pressures.