Manual Jablotron SD-282ST (page 1 of 1) (English)

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The SD-282ST combined smoke and heat detector MLW51102 1

The SD-282ST combined smoke and heat detector

The SD-282ST is used to detect fire hazards in the interior of residential or commercial

buildings. It is not designed to be installed in industrial premises.

The detector indicates fire hazards using the built-in LED indicator and alarm outputs

ALARM and TAMPER. These outputs must be connected to control panels

complaining with EN 50131-3..

The SD-282 ST consists of two independent detectors – an optical smoke detector and

a heat detector. The optical smoke detector works on the principle of scattered light and

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 there is also a built-in heat detector which has slower reaction but is much

better at detecting fire which generates heat quickly with a small amount of smoke. The

microprocessor performs digital analysis of these values which markedly increases false

alarm immunity.

Detector range

The smoke detector must be installed so that any smoke easily drifts into the detector,

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 detector must always be placed in the section leading to the exit of the building

(escape route), see Figure 1. If the building has a floor area greater than 150 m

installation of an additional detector in some other suitable place is required, see Fig.2.

Fig. 1

Fig. 2

1-kitchen

2-living room

3-bedroom

4-children’s bedroom

- Basic security

- For more security

Fig. 3

For large buildings it is recommended to place additional detectors in rooms where

people sleep and in rooms with an increased risk of fire - 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 though (always keep at least a 0.5

m distance from the corner) see Fig 4.

 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.

0.5m

TOP

Fig. 4

0,9 m

Fig. 5

centre of the room, best location

acceptable location

 Walls, partitions, barriers and lattice ceilings

The SD-282ST detector must not be installed closer than 0.5 m from any wall or

partition. A narrow room with a width of less than 1.2m requires the detector(s) to be

placed at a distance of at least one third of the room’s width away. In the case of separating

walls (partitions, warehouse objects) which do not reach the ceiling, the space is

considered to be fully separated if the gap between the top of the separating wall and

the ceiling does not exceed 0.3 m. A free space of at least 0.5m is required under the

detector. Any irregularities of the ceiling (e.g. girders) exceeding 5 % of the ceiling height

shall be considered a wall and the above mentioned limitations shall apply.

 Ventilation and air circulation

The detectors must not be installed directly by a fresh air inlet (e.g. 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 0.6m of the detector.

 Avoid installing the detector in the following locations:

 places with poor air circulation (niches, corners, apexes of A-shaped roofs, etc.)

 places exposed to dust, cigarette smoke or steam

 places with over-intense air circulation (close to ventilators, heat sources, air

conditioning outlets, etc.)

 in kitchens and other cooking places (because steam, smoke or oily fumes can reduce

detector sensitivity).

 beside fluorescent lights (electrical interference can cause a false alarm)

 in areas with lots of small insects

Please note: Most false alarms are caused by improper

detector location.

See CEN/TS 54-14 standards for detailed installation guidelines.

Installing the detector

Fig. 6: 1– detector cover opening; 2 – detector cover closing; 3 – optical

status signalling; 4 – arrow showing where to insert the detector; 5 –

configuration jumpers; 6 – connection terminals;

1. open the detector cover, by turning it anti-clockwise

2. attach the removed plastic base to the desired place with screws (not shown above).

3. set the required detector function – see the table below

ON NO contact 3 OFF

OFF NC contact 4 OFF

smoke (EN 54-7) or

heat (EN 54-5)

ON memory ON 3 ON

OFF memory OFF 4 OFF

smoke only (EN 54-7)

(not heat)

3 OFF

4 ON

heat only (EN 54-5)

(not smoke)

3 ON

4 ON

Both smoke and heat

(both conditions at the

same time)

4. connect ALARM and TMP terminals – first study the control panel installation manual

before connecting wires to the detector terminal board

TMP- has only NC function

5. connect power supply to the 12V terminals

6. close the module cover. The detector can be inserted in the plastic base in one position

only. The correct position is marked with arrows on both plastic parts.

Fire alarm

Optical detector: When smoke penetrates into the detector, the detector starts

flashing red.

Heat detector: When the temperature reaches the set limits, the detector starts

flashing red.

Alarm memory: If it is enabled, alarm indication continues even when the smoke clears

or when the temperature decreases. The indication is terminated by disconnecting power

supply or by turning the detector anti-clockwise (tamper sensor activation).

Fault indication

The detector checks its functioning. If any faults are discovered, it starts flashing

rapidly for about 2 minutes. Then there are 3 short flashes every 30 seconds.

In such a case, disconnect the power supply for 1 minute and then reconnect it. If the

LED indicator starts flashing again after 1 minute, send the detector to a service centre.

Technical specifications

Power 9 - 15V DC / 5 mA

Smoke detection optical light scattering

Smoke detector sensitivity m = 0.11 - 0.13 dB/m pursuant to EN 54-7

Heat detection class A2 according to EN 54-5

Alarm temperature + 60°C to + 70°C

Operating temperature range -10 to +80°C

Dimensions, weight diameter 126 mm, height 52 mm, 150 g

Conformity EN 54-7, EN 54-5, EN 50130-4, EN 55022

1923-CPD-0244

JABLOTRON ALARMS a.s. hereby declares that the SD-282ST detector is in

compliance with the essential requirements and other relevant provisions of

Directive 1989/106/EC and 2004/108/EC. The original of the conformity

assessment can be found at www.jablotron.com, Technical Support section.

Note: Although this product does not contain any harmful

materials we suggest you return the product to the dealer or

directly to the producer after use. For more information visit

www.jablotron.com.

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Jablotron SD-282ST Manual

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