Smoke Alarm User Manual

Installation, Operation and Maintenance Manual
Page 6-2 Issue 1
February 2001
Areas with higher levels of particulate may be beyond the Detector’s default sensitivity range and
maintain an alarm condition, even during normal periods. In these instances, it is recommended that
range be selected either manually or by the AutoSetup function by use of the LaserNET software.
Commissioning tests will determine and verify that transport time and suction pressure are within design
tolerances.
6.4 Transport-Time Testing
Transport time testing must be done on all systems. The farthest detection point should be exposed to a
smoke source and the time required for that smoke to register on the Detector should be recorded.
Measured transport times will most likely be shorter than the “SNIFF” calculated values. The measured
transport time should not exceed the calculated times by more than 10%. Measured transport times less
than the calculated times are acceptable.
NOTES
To meet with British Standard BS6266 (Test A3 and A4) the unit must respond within 120
seconds of cessation of energisation of smoke.
All test results should be entered into an installation commissioning record sheet. This information can
then be used in all subsequent testing to ensure that the piping network has maintained its integrity and is
not blocked.
6.4.1 Commissioning Sheet
Refer to Appendix 1 for Commissioning Sheet.
6.5 Suction Pressure Testing
The suction pressures of the first and last sampling point in each pipe segment must be measured and
recorded on all systems.
The measured suction pressure must be compared with the SNIFF versoin 3.0 calculated values. The
values will most likely be greater than the “SNIFF” calculated values. The measured suction pressures
must never be over 10% less than the calculated values. Measured suction pressures greater than the
calculated values are acceptable.
Use the following method to check suction pressures:
(1) Attach a flexible hose onto the suction side of the magnehelic pressure gauge.
(2) Attach a capiliary tube into the other end of the hose.
(3) Insert the capiliary tube into the sampling hole to be measured. Care should be taken not
to block the hole.
(4) Hold the gauge in the plane it has been calibrated. This should be indicated on the face
of the meter. The suction pressure can now be read.