Hochiki FIRElink-100 - Manual (Page 21)

FIRElink-100 – Installation Manual Page 21 of 40
© 2010 Hochiki Europe (UK) Ltd
9-5-0-345/ISS4/OCT10
B
Above Ceiling
Sampling with
detector
mounted in
ceiling void.
2.1 System Design
Simple designs with short sampling pipes produce the best results. Complex sampling pipe runs should
be avoided with the FIRElink-100 detector. The use of ‘T’ branch-pipes is not recommended. To assist in
design and to verify system performance, it is advisable to use the FIRElink PipeCAD® sampling pipe
modelling software.
Always locate the sampling points in positions to which smoke may reasonably be expected to travel. Do
not expect ceiling mounted sampling points to operate satisfactorily if air flow from air-conditioning
systems keeps the cool smoke from an incipient fire reaching from reaching ceiling level. In this instance
it is usually better to locate the sampling pipe directly in the airflow (for example across the return air
register of an air conditioning unit).
There is no substitute for carrying out smoke tests prior to installation of pipe work to indicate suitable
sampling point location.
No more than TWO Air Handling Units may be protected with one FIRElink-100 detector. In this
application, ensure that the sampling pipe is raised clear of high velocity air in the immediate vicinity of
the air intake grille on stand-off posts as shown below: