Replacing The Ultrasonics Flow Sensing And Scanning Module - VESDA -E VES-A00-P Product Manual

VESDA-E VES-A00-P Product Guide
7.8 Replacing the Ultrasonics Flow Sensing and Scanning
Module
Caution: Electrostatic discharge (ESD) precautions need to be taken prior to removing the fascia from
the detector. A wrist strap must be connected to the case of the detector (Figure 7-7).
To replace the Ultrasonics Flow Sensing and Scanning Module, perform the following steps:
1. Open the front door and remove the front fascia. Refer to Sections 7.2 and 7.4 for further information.
2. Take the top cover off. To do this, press the tabs down while pushing the cover from inside the detector.
3. Remove the Aspirator as described in Section 7.5 on page 86.
4. Remove the Sampling Module as described in Section 7.7 on page 93.
5. Remove Smoke Detection Chamber as described in Section 7.6 on page 88.
6. Remove Ultrasonics Flow Sensing and Scanning Module as described below.
7. Install the new Ultrasonics Flow Sensing and Scanning Module as described below.
8. Reinstall the Smoke Detection Chamber as described in Section 7.6 on page 88.
9. Reinstall the Sampling Module as described in Section 7.7 on page 93.
10. Reinstall the Aspirator as described in Section 7.5 on page 86.
11. Reinstall the top cover.
12. Reinstall the front fascia. Refer to Sections 7.2 and 7.4 for further information.
Remove the Ultrasonics Flow Sensing and Scanning Module
1. Turn off the 24V DC power to the detector.
2. Disconnect the main board loom connection at J2 and antenna connection at J11 (Figure 7-24).
Figure 7-24: Disconnect the main board loom connection at J2 and antenna connection at J11
3. Remove the three screws holding the Ultrasonics Flow Sensing and Scanning Module to the detector
base (Figure 7-25).
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