LaserFOCUS VLF-500 Product Guide
VESDA
®
8
Exhaust air pipe connections
Where the VESDA LaserFOCUS is located outside the protected area, consideration must be
given to returning the exhaust air to the protected environment to balance pressure differences
that may exist between the two areas. In the majority of applications, this is not necessary as
pressure differences are minimal.
In some circumstances, the pre-engineered solutions in this manual may not be suitable and it is
recommended that alternate designs are verified by a suitably qualified installer using ASPIRE2.
Examples of these circumstances are: where pressure differences exceed 50 Pa; in situations
where the detector is located outside the protected area; in cases where the are hazardous
substances inside the protected area eg hospital operating theatres, laboratories. In these cases,
the exhaust should be returned to 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. Remove the fitted exhaust deflector and install a return air pipe where
required.
The air exhaust port is tapered to accept standard pipes of OD 25 mm (ID 21 mm) or
IPS ¾ in. and provide an air tight seal.
Note:
Do not glue the exhaust air pipe to the detector. This will void your warranty.
Wiring connections
Caution:
Electrostatic discharge precautions need to be taken prior to removing the front
cover from the detector otherwise damage may occur to the unit.
Detector cabling requirements
The screw type terminals located on the termination card within the VESDA LaserFOCUS will
accept wire sizes from 0.2 mm
2
to 2.5 mm
2
(30 – 12 AWG).
Refer to
Codes and Standards Information for Air Sampling Smoke Detection
on page iv for
code-specific requirements.
Refer to the VESDA System Design Manual for cabling details.
