3931271/2016.04/K - The right to make technical changes reserved!
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1- Table of Contents
Operating Instructions
DRD 3 Smoke Detector
10. General Information
The optical smoke detector DRD 3 is a component of the Dupline building management
system and allows an early detection of smouldering fires as well as flaming fires that de-
velop smoke. It operates on the proven light scatter principle. Inside the sensing cham-
ber a light source and a light sensor are arranged so that light normally does not fall on
the sensor. It is only when airborne particles enter the chamber that light is scattered onto
the sensor (Tyndall effect) to produce the electrical signal. This design means that no ra-
dioactive source is required.
The DRD 3 only needs the connection to the Dupline conductors. The smoke alarm as
well as the status signal, which indicates the correct connection between the smoke de-
tector and the in-built Dupline circuit board, are transmitted via the Dupline bus. Besides
the alarm, the LED in the housing of the DRD 3 shows also the state of function of the de-
vice.
11. Important Notes in Advance
• The installation may only be carried out by an authorised technician
• The Dupline signal supply has to be delivered by sources, which have to be installed
in accordance with the regulations governing protective low-voltage (see VDE 0100,
Part 410, or EN 50090-9-1) as well as the installation has to comply with these re-
quirements. Even if extensive protective measures have been implemented in the
device, other voltages at the signal inputs could result not only in the destruction of
the device, but also endanger people. For further information please refer to the Du-
pline Planning Aid.
• This Dupline PCB is unprotected. Static charges of the human body may destroy the
PCBs’ components when touching it. Therefor, carry out a discharge by touching
grounded objects before removal and reinsertion of the PCB.
• In case of a disturbance of the Dupline bus system, alarm signals - sent by the
smoke detector - are not transmitted.
12. Coding
At the 4-pole flat pack connector D of the PCB A, which is accessible after screwing off
the base and removing the PCB, it is possible to assign any addresses between A1 and
P8 to each channel, using the hand encoder DHK 1 (see chapter 19 “Anschlussschema
/ Connection Diagram” on page 11).
The channel allocation is as follows:
Channel
Description
Channel
Description
1
Alarm signal
a
a. Active on detection of smoke.
3..8
Not assigned
2
Status signal
b
