VESDA by Xtralis
VESDA VLI Product Guide
www.xtralis.com
51
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.
Once the VLI detector has been commissioned, it will report alarms and faults according to the parameters
defined during installation.
Note:
Detectors should be commissioned with a smoke test.
Prior to commissioning the detector:
1. Check 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). Ensure that the relevant
pipes are selected as in use in Xtralis VSC.
2. Check that the power is connected and on. Let the detector run for around 15 minutes, ensuring that the
pipe flow rates comply with the minimum requirements listed in Section 4.1. Ignore the faults during this
time. Reset the detector after 15 minutes of operation.
3. Normalize the airflow. This takes approximately 10 minutes. The pipe flow rates should now be close to
the ASPIRE2 predictions.
4. Reset the detector after normalization. It should now be running without faults, providing the flow rates are
maintained as indicated in Section 4.1.
It is important that the protected environment 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 by using 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 environmental background variations.
During the learning cycle, 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 16 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.
Alarm Level
AutoLearn Smoke Range
Alert
0.05%–1.990% obs/m (0.016% - 0.637% obs/ft)
Action (Pre-Alarm) 0.1%–1.995% obs/m (0.032% - 0.638% obs/ft)
Fire1 (Alarm)
0.15 %–2.0% obs/m (0.048% - 0.64% obs/ft)
Fire2
0.155 %–20.0% obs/m (0.05% - 6.4% obs/ft)
Table 6-1: AutoLearn Smoke range
For code-specific information, see Codes and Standards Information for Air Sampling Smoke Detection on
page iii.
