GIRA
Info
Smoke detector
Instructions for Installation
Smoke detector
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Linking smoke detectors
You can link up to 40 Gira smoke detectors with one another. The connection of the detectors is
achieved parallel with a two-core cable (e.g. telephone cable: J-Y(St)Y 2x2x0.6 mm). The total cable
length of the detector network may not exceed 450 m.
k
+ Linking
l
- Linking
To link the smoke detectors, proceed as follows:
1. Pull the connection block from the smoke detector board.
2. Connect the color-coded clamps (green = plus; gray = minus) to the line as portrayed in the
illustration.
To do this, insert the stripped cores into the opened spring clamps and close the clamps by
pressing down on the handle.
3. Place the connection block on the board again.
Method of operation, self-test and battery test
The smoke detector recognizes a fire early on by its smoke development. It works according to the
principle of scattered light: light transmitters and receivers are arranged in the measurement chamber
so that the light signal emitted by the transmitter cannot directly hit the receiver (photocell). If smoke
enters the smoke chamber, the light signal is scattered by the floating particles contained in the
smoke. The scattered light rays hit the photocell and are transformed into an electrical signal there,
which triggers the alarm.
The function of the smoke evaluation is constantly checked by a self-test. Any errors are reported by a
disturbance signal (signal sound and light diode).
The battery test continuously checks the supply voltage. If the battery voltage sinks below a defined
level, the smoke detector reports for 30 days that battery must be changed. During these 30 days, the
smoke detector is fully functional.
