VESDA VLI Product Guide VESDA by Xtralis
34 www.xtralis.com
When configuring the detector ensure that the correct pipes in use are selected:
Table 4-1: Preferred use of pipe inlet ports
No. of Pipes Preferred Pipe Inlet Port to use
Pipe 1 Pipe 2 Pipe 3 Pipe 4
1 Inlet 2 or 3 Inlet 2 or 3
2
3 Inlet 1 or 4 Inlet 1 or 4
4
Figure 4-1: Pipe inlet port numbering
For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iii.
4.4 Managing the Exhaust Air
Air is expelled from the detector via the exhaust port at the bottom of the unit enclosure.
The air exhaust port is tapered to accept standard pipes of OD 25 mm (ID 21 mm) or IPS ¾ inch and
to provide an airtight seal. Remove the exhaust port plug and if required, connect an outlet pipe to
the exhaust manifold. DO NOT glue this pipe to the exhaust manifold as this will void the warranty.
Where the detector is located outside the protected area, it may be necessary to return the exhaust
air to the protected environment. For example, where pressure differences exceed 50 Pa, or where
hazardous substances are present inside the protected area. Return air pipes need to be as short as
possible to minimize the effect of airflow resistance in the return air pipe network.
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