JABLOTRON
ALARMS
a.s.
Pod
Skalkou
4567/33
46601
Jablonec
n.
Nisou
Czech
Republic
www
.jablotron.com
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SD-283ST Wired combined smoke and heat detector
SD-283ST Wired combined smoke and heat detector
1 / 2
MLW55404
The SD-283ST is used to detect fire hazards in the interior of
residential or commercial buildings. The detector is also suitable for
installing in caravan trailers or mobile homes. The product is not
designed to be installed in industrial premises.
The detector indicates fire hazard using the built-in LED indicator
and acoustic signalling. The detector can also be powered from an
external 12 V DC source or from the alarm system control panel
and it provides ALARM and TMP outputs. When the detector is
used with inserted batteries (3x 1.5 V AA), it can continue operating
as a stand-alone detector when the external 12 V power supply is
disconnected.
The SD-283ST consists of two independent detectors – an optical
smoke detector and a heat detector. The optical smoke detector
works on the principle of scattered light. It is very sensitive to large
dust particles which are present in dense smoke. It is less sensitive
to smaller particles generated by the combustion of liquids such as
alcohol. That is why the fire detector also contains a built-in heat
detector which has a slower reaction but is much better at detecting fire
which generates only a small amount of smoke.
Detector range and location
The smoke detector must be installed so that any smoke easily
drifts into the detector owing to natural thermal currents, e.g. on the
ceiling. It is suitable for residential buildings but not suitable for free
spaces, outdoor environments or interiors with extremely high
ceilings (above 5 m) where fire by-products can disperse over a
large area – the smoke would not reach the detector position.
The detectors should be installed by a trained technician with a
valid manufacturer’s certificate.
Detectors should be installed in the building according to the
project documentation. If such documentation is not available, their
position should comply with the effective standards for fire alarm
signalling systems.
The detector must always be placed in the section leading to the
exit of the building (escape route), see
Fig. 1
. If the building has a
floor area greater than 150 m
2
, installation of an additional detector
in some other suitable place is required, see
Fig.2
.
1. kitchen,
2. living room,
3. – 6. bedrooms
y
/
basic coverage
{
{
/
recommended
coverage
Fig 1
Fig 2
Fig 3
In multi-storey flats and family houses the detector should be
installed above the stairs. It is recommended to place additional
detectors in rooms where people sleep. See
Fig 3
.
Installation on level ceilings
Place the detector in the centre of the room if possible. The
detector must not be recessed into the ceiling due to the
possible existence of a cool air layer on the ceiling.
Never
place the detector in the corner of the room (always keep at
least 0.5 m distance from the corner - see Fig 4). There is an
insufficient circulation of air in the corners.
Installation on sloping ceilings
If the ceiling is not suitable for mounting on a level surface (e.g. a
room under a roof ridge), the detector can be installed as in Fig. 5.
Fig 1
0,9 m
Fig 2
centre of the room, best location
acceptable location
Walls, partitions, barriers and lattice ceilings
The SD-283ST detector must not be installed closer than 0.5
m from any wall or partition.
A narrow room with a width of less than
1.2 m requires the detector(s) to be placed at a distance of at least one
third of the room’s width away. In a case when a room is separated
into sections with furniture, racks or semi partition walls which do
not reach the ceiling, the space is considered to be fully separated
if the gap between the top of these and the ceiling does not exceed
0.3 m
.
A free space of at least 0.5 m is required under and around the
detector. Any irregularities of the ceiling (e.g. girders) exceeding 5 % of
the ceiling height should be considered a wall and the above mentioned
limitations should apply.
Ventilation and air circulation
The detectors must not be installed directly by ventilation or air
conditioning vents.
In the case of air being supplied through a
perforated ceiling, each detector must be placed so that no
perforation hole occurs within 0.6 m of the detector.
Avoid installing the detector in the following locations:
x
places with poor air circulation (niches, corners, apexes of A-
shaped roofs, etc.)
x
places exposed to dust, cigarette smoke or steam
x
places with over-intense air circulation (close to ventilators,
heat sources, air conditioning outlets, etc.)
x
in kitchens and other cooking places (because steam, smoke or
oily fumes can cause false alarms or reduce detector sensitivity).
x
beside fluorescent lights or energy-saving light bulbs
(electrical interference can cause a false alarm)
x
in areas with lots of small insects
Warning:
Most false alarms are caused by improper detector
location.
See CEN/TS 54-14 standard for detailed installation guidelines.
Installation
When installing the detector, abide by the procedures
recommended in the previous paragraphs.
Fig 3: 1 – detector cover opening; 2 – detector cover closing; 3 – optical
status signalling; 4 – arrow showing where to insert the detector; 5 – terminal;
6 – configuration terminals; 7 – battery holders
1.
Open the detector cover
, by turning it anti-clockwise
(1)
2.
Attach the base to the selected place using screws.
