VESDA VLC, Руководство по обслуживанию

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VESDA Maintenance Guide VESDA
26 www.xtralis.com
Figure 8-14: Replacing VESDA VLP and VESDA VLS head termination cards
8.1.5 Replacing VESDA VLP and VESDA VLS Detector Modules
Note: Isolate and power down the detector before you begin.
Replacement Procedure
1. Insert a screwdriver at the top between the Module and the Front Cover (refer to Figure 8-5 on page 20),
2. Gently remove the module from the front cover by levering the screwdriver.
3. Disconnect the wire loom from the module processor card.
4. Connect the wire loom to the respective 10 or 11 way connector(s) on the module processor card.
5. Secure the modules to the front cover by gently snapping the module into place ensuring that none of the
EMC Screening is trapped.
6. Power up the detector.
8.1.6 Inspecting and Cleaning VESDA VLS Valves
The VESDA VLS has four valves that open and close to allow the detector to draw air from one sampling pipe
at a time. Since the air that reaches the valves has not been filtered, it may contain dust, dirt, and background
pollution such as soot or coal dust.
Inspection and Cleaning Procedure
1. Remove the pipes leading into the VESDA VLS detector.
2. Press, and hold down, the Silence/Scan button on the front of your VESDA VLS detector. The valve scan
test will start. If your VESDA VLS does not have a Silence/Scan button, use your PC and Xtralis VSC to
start the valve scan test (step 3 to 6).
3. Logon to Xtralis VSC.
4. Select the VESDA VLS detector from the Device Tree.
5. Select Device from the Main Menu.
6. Select Start Manual Scan Test. A dialogue box confirms that you wish to proceed with the test. Select
Yes to continue.
7. Once the valve scan test is complete, look inside the inlet ports to see that the valves are periodically
opening and closing. Also look for evidence of a build-up of dirt.
8. If dirt is found, you will need to remove the chassis before flushing the valves. Refer Section 8.1.3 on
page 20 for details.
9. Remove the air inlet manifold and clean it with compressed air. The manifold is sensitive so do not clean
with more than 87 KPa (6 bar) compressed air.
10. Once clean, reassemble the detector and perform a test to ensure system integrity.