VESDA VFT Product Guide
VESDA by Xtralis
50 www.xtralis.com
C.1 Pre-Commissioning
Pre-commissioning is split into two parts. The first set of tasks can be performed before you visit the
customer site. Gathering the information first will save you time once you reach the site as you will only visit
the site when you have all the materials required to complete the commissioning process.
C.1.1 Before going to the Site
Prior to starting the commissioning process, the commissioning engineer should study any design and
installation considerations for the site. Properly maintained air sampling network design and installation
records should assist in providing most of the information.
You must ensure that you have a copy of:
1. The site layout plans.
2. The As Installed drawings for the site.
3. Microbore network design records.
4. Microbore network installation record.
5. Relevant product and installation guides.
6. A set of VESDA commissioning forms (Xtralis Document 12678).
7. Other forms required by the local codes and standards.
8. A PC or Laptop with appropriate PC Software and Serial lead (9-pin female-to-female null modem
cable) to configure and commission the system.
9. Material for conducting an acceptable smoke test. See the VESDA Commissioning Guide for more
information on smoke tests.
You must be aware of the local codes and standards as applicable to the customer site.
C.1.2 Commissioning Form - Prerequisites
During the pre-commissioning stage you should complete the client and the site details in the Commissioning
form (Xtralis Document 12678). Enter the following details:
l Customer Name
l Site address (formerly called a site zone)
l Installer’s Name
l Installer’s Address
l Type of Application (e.g. cabinets, manufacturing, warehouse)
l Your name and address
C.1.3 On Site
Once you have completed all the tasks required above you are ready to go to the site and complete the
commissioning.
Checking Cabling and Initial Powerup
Before commencing the commissioning process, check the electrical and network cabling for the system.
Ensure that all electrical wiring is securely terminated at the relevant devices maintaining the correct polarity.
The system should be connected to a power source supplying 24 VDC.
Caution: The VESDA system will not operate when the supply is reversed. Operating the VESDA device
when DC supply voltage is outside the voltage range of 18 VDC and 30 VDC may cause
damage to the device.
Check that all electrical installations meet the requirements of local electrical codes and standards.
Data communication between detectors is done via an RS485 connection. The communication between
devices connected to the network is unidirectional. The polarity must be maintained throughout the network. It
is recommended that RS485 (Belden 9841 - 120 ohm) twisted pair cables (or similar) be used. You must
ensure that the network is appropriately wired, refer to Section D.4 for further details.
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