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20°C => 3.8 %/m
↓
↓
40°C => 1.8 %/m
When the calculated value in the decision algorithm exceeds the lower graph, pre-
warning will be activated. When it exceeds the upper graph, fire alarm will be
activated.
Temperature = °C. Smoke value = obscuration (%/m) x 10.
The Analogue multi detector's COM loop address (Technical address) is set with
the Address setting tool 3314 / 4414. The detector has an address label on which
the programmed technical address can be written.
Note: The multi detector 4300 in system FT1020G3 takes two COM loop (technical)
addresses of the available 255 addresses. One address that is set with the 3314 / 4414
tool but also the following address will be "occupied" for the heat part of the detector and
cannot be used by any other unit on the COM loop.
The Address setting tool 3314 / 4414 is also used for mode setting:
NORMAL mode: 4300 is set to this mode in EBLWin. For the smoke detector, set
to one of six algorithms H-15, H-35, L-15, L-35, N-15 or N-35 and for the heat
detector set to one of three algorithms for class A1 (static response temp. 54-
65°C), A2 S (54-70°C) or B S (69-85°C).
4301
Analogue photo electric smoke detector. Discontinued and replaced with 4401 in
Normal mode, see below. Scattered light (i.e. reflection of infrared light) is used to
detect smoke. To be plugged in an Analogue base (3312 / 4313 / 3379). Built-in
LEDs are lit to indicate that the detector has activated fire alarm. Prepared for
mechanical lock (screw attached) if required.
The COM loop address is set with the Address setting tool 3314 / 4414. The
detector has an address label on which the programmed COM loop address can
be written. The Address setting tool 3314 / 4414 is also used for mode setting:
NORMAL mode: 4301 is set in EBLWin to this mode to one of the six algorithms
H-15, H-35, L-15, L-35, N-15 or N-35.
58 > temperature (°C) + adjusted smoke value
The "Decision algorithm", see Figure 25, can be used to reduce false
alarms (nuisance alarms), because at a normal room temperature, more
smoke is required to activate fire alarm than when the room temperature
is high (or is rising). In a real fire condition, the room temperature will rise
rather fast and less smoke is required to activate fire alarm. Very little
smoke requires a "high" temperature to activate fire alarm and a lot of
smoke will activate fire alarm also at a "low" temperature.
Figure 25 Decision algorithm
57
Technical/Programming Manual
FT1020G3 Rev 2.2.1
52
> 50.
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