VESDA VLF-500-UL 7Ed Product Guide VESDA
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9.2 Maintenance Schedule
To maintain the VESDA VLF-500-UL in peak working order follow the maintenance standards for your region
and where no recommended standard exists see the table below. Please note, for environments that
experience high levels of contamination, the frequency of maintenance will need to be increased.
Maintenance should be conducted by a qualified service contractor.
Action Frequency Details
Check pipe
network
6 monthly Check pipe connections to ensure all pipe runs are intact and that
pipe supports and joints are firm.
Airflow Yearly Check air flow via Xtralis VSC software. Compare the current
reading with previous reading to determine if the flow rate has
reduced.
Smoke test Yearly Conduct smoke tests and verify detector performance (refer to the
VESDA System Design Manual).
Compare response times with those previously recorded and
investigate any discrepancies.
Check power
supplies
Yearly Test in accordance with suppliers instructions.
Filter replacement 2 Yearly Recommended change out period. The filter status can be checked
via Xtralis VSC software. Depending on the environment, the filter
may require more frequent checking.
Clean sampling
holes
As necessary If frequent low flow faults occur clean the sampling pipe network by
back flushing (refer to the VESDA System Design Manual).
Table 9-1: Maintenance schedule
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