VESDA by Xtralis
VESDA VLI Product Guide
www.xtralis.com
41
6
Commissioning
The VLI has been designed to simplify commissioning processes. The AutoLearn function allows the
unit to assess its environment and setup appropriate alarm and flow thresholds.
The detector is programmed using Xtralis VSC software or LCD Programmer via VESDAnet.
Note:
Detectors should be commissioned with a smoke test.
Prior to commissioning the detector, check:
1. That the power is connected and on.
2. That the pipe network is clean and correctly fitted with all joints correctly seated and sealed
(except the endcaps and the pipe which enters the detector which must not be glued).
It is important that the protected area is working under normal operating conditions when operating
the AutoLearn processes.
For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iii.
6.1
AutoLearn Smoke
AutoLearn Smoke is initiated within Xtralis VSC or the LCD Programmer.
During the AutoLearn Smoke process, the detector determines the average smoke and peak smoke
obscuration levels and sets suitable alarm thresholds for the operating environment. This process
will minimize nuisance alarms due to normal environment smoke variations.
During the learning cycle, alarm conditions can be reported. If an alarm condition occurs, AutoLearn
will not complete its cycle. In this situation the user must restart the AutoLearn process. If AutoLearn
is halted, the alarm thresholds will be left at the previous settings.
Conditions experienced during learning are assumed to be representative of normal operating
conditions.
The AutoLearn Smoke learning times range from above 15 minutes to 15 days, with the default
being set to 14 days.
If AutoLearn is running during the changeover period from Day to Night Thresholds, make sure that
AutoLearn runs for at least an hour in both the Day and Night periods.
Table 6-1: AutoLearn Smoke range
Alarm Level
AutoLearn Smoke Range
Alert
0.025%–1.990% obs/m (0.008% - 0.637% obs/ft)
Action (Pre-Alarm) 0.025%–1.995% obs/m (0.008% - 0.638% obs/ft)
Fire1 (Alarm)
0.025 %–2.0% obs/m (0.008% - 0.64% obs/ft)
Fire2
0.025 %–20.0% obs/m (0.008% - 6.4% obs/ft)
For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iii.
