VESDA Maintenance Guide VESDA
12 www.xtralis.com
Capillaries
Capillaries can only be installed in environment classes 1 to 4 (refer to Appendix B on page 49). Though not a
requirement for environment classes 1 & 2, cleaning of capillary tubes in moderately dirty areas (environment
classes 3 & 4) should follow the instructions below:
1. Ensure that detectors are isolated from the monitoring panel and fire suppression systems.
2. Notify the relevant authorities that work is being performed.
3. Check and record the current airflow for before and after comparison.
4. Disconnect the detector power supply.
5. Remove all pipes from the detector inlet(s) and exhausts then cover them to ensure that no further dust
can enter the detector.
6. Remove the capillary tubes from the sampling pipe and unscrew the sampling end pieces, if applicable.
7. Clean out the capillary tubes and sampling end pieces with a vacuum cleaner or compressed air source.
8. Visually check that each part has a clear air path.
9. Reassemble the sampling end pieces, if applicable, and connect them to the capillary tubes.
10. Reconnect the capillary tubes to the sampling pipe network, ensuring that there are no kinks. If the
sampling pipe network is also to be flushed, do not reconnect the capillary tubes until this has occurred.
11. Compare the before and after flow rates. Ideally, the flow should be close to 100% for each used pipe. If
this is not the case, the pipe network and detector may need closer inspection.
12. Once the system has been serviced, cleaned, tested and is operating fault-free, return it to its normal
operating mode.
HASP (Heat Activated Sampling point)
1. Visually inspect the HASP heat responsive element is free from dust, corrosion, paint, insects and other
foreign material
2. Visually inspect for poorly fitting or missing/damaged heat responsive element
3. Remove (unscrew) the HASP from the mounting base and conduct a smoke transport time test
4. Visually check for obstructions surrounding the HASP likely to impede heat of fire from reaching heat
responsive element.
Notes:
l The HASP heat sensing element is NOT to be removed and reinserted for maintenance or any cleaning
activities.
l Do not glue a poorly fitted or a removed heat sensing element to the HASP. Replace the HASP in its
entirety.
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