VESDA VLC, Maintenance Manual

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VESDA VESDA Maintenance Guide
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3 Detector Maintenance
This chapter provides general instructions for the regular maintenance of detectors. If you need to address
faults, refer to the Xtralis VSC Online Help for a list of detector and VESDAnet faults. Should you need to
address the 10 instant fault finder faults on the VESDA VLF detector, refer to its Product Guide.
Further information on maintenance, part replacement and recommended filter replacement frequency are
provided throughout the remainder of this document.
Note: Xtralis recommends that you record all work you perform in a maintenance log such as that in
Appendix C on page 51.
3.1 Maintenance Procedures
If you do not need to determine a maintenance schedule, continue with the instructions listed below:
1. Ensure that the detectors are isolated from the monitoring panel and suppression systems.
2. Notify the relevant authorities about the work to be performed and the risks associated with isolating an
address.
3. Check for and record any detector faults.
4. If a filter fault is displayed, the current filter is older than the recommended filter replacement frequency.
Replace the filter, according to the detector's guidelines, making sure that you write the date of
replacement on the label and take measures to order stock for the next replacement date. For detector
specific filter replacement instructions, refer to Chapter 8 or the detector Product Guide. The color codes
for the dates of VSP-005 filter manufacture (as used in VESDA VLP, VESDA VLS, VESDA VLF and
VESDA VLC detectors) are given in Table 2-1 on page 6.
l
The VESDA VLI detector has multiple filters. Refer to the VESDA VLI Product Guide for further
information.
5. Download and save the event log for comparison of smoke readings during normal operation.
6. Record the current airflow (% and raw values) for before and after comparison.
7. Disconnect power to the detector.
8. Remove dust from around the pipe inlets.
9. Disconnect all pipes from the detector inlet(s) and exhausts then cover them to ensure that no unwanted
material can enter the detector.
10. Optional - proceed with this step if there is a low flow fault, a noisy aspirator, excessive or noticeable dust
around the exhaust. Remove the detector aspirator (refer to Chapter 8 or the detector Product Guide) and
blow it out with compressed air. Make sure that it is cleaned well away from the detector. The aspirator
can collect a significant amount of material in dusty environments, cleaning with compressed air (400
KPa) may produce a large quantity of dust.
11. Remove the filter and clean any visible dust around it.
12. Reconnect all pipes.
13. Re-assemble the detector aspirator and filter.
14. Turn the power supply back on.
15. Allow the detector to operate for 15 minutes (still in isolate/disable mode).
16. View any faults present and take the appropriate action to fix them.
17. After allowing the detector to operate in a stable and correct state for 15 minutes, review the event log to
monitor the background smoke level. If Xtralis VSC remained connected, it is possible to review the
active event list.
18. Check this value against the Environment Class (Appendix B on page 49) to determine the next
scheduled maintenance period.
19. Set the filter timer to reflect the correct environment.
20. Compare the background smoke level with that recorded during previous maintenance visits. While the
background smoke level should be the same, it may be different if your environment has changed. If a
difference in background smoke level cannot be explained by a change in your environment, you should
do one or all of the following: clean the detector, clean the sampling pipe network and/or change the filter.
If you do any or all of these, you should re-check the background smoke level before proceeding.
21. Compare the before maintenance and after maintenance flow rates. Ideally, the flow rate should be close
to 100% for each used pipe. If this is not the case, check the sampling pipe network for loose connections
or obstructions.