Bosch FAH-420, Operation Manual

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Installation locations Selectable sensitivity
Theater/concert hall Medium
Warehouse with vehicle traffic Low
Office (smoker)/waiting room/restaurant/meeting room Low
Conference hall/waiting room/fairground Low
Office (after hours) High
School/kindergarten Medium
Production location Low
EDP room High
High storage warehouse without vehicle traffic with combustion
engine High
Office (day mode) Medium
FAH-T 420/FAH-T 420-KKW
Selectable installation locations in the programming software (WinPara and
FSP‑5000‑RPS)
§ A2R Typical application temperature: 25 °C, T
max
+ T
diff
, height up to 6 m
A2S Typical application temperature: 25 °C, only T
max
, height up to 6 m
A1R Typical application temperature: 25 °C, T
max
+ T
diff
, height 6 m to 7.5 m
A1 Typical application temperature: 25 °C, only T
max
, height 6 m to 7.5 m
BR Typical application temperature: 40 °C, T
max
+ T
diff
, height up to 6 m
BS Typical application temperature: 40 °C, only T
max
, height up to 6 m
§ = Basic setting in the WinPara and FSP‑5000‑RPS programming software
Sensitivity classes as per EN 54 Part 5
With the detector types FAH‑T 420 and FAH‑T 420‑KKW, it is possible to set one of the
sensitivity classes listed above in line with planning.
In the sensitivity classes A1, A2S and BS, the FAH-T 420 or FAH‑T 420‑KKW is operated purely
as a thermal maximum detector. In this case, the detector does not activate at below 54 °C in
class A2S, and not below 69 °C in class BS.
The sensitivity classes A2S and BS are therefore particularly suitable for applications where
higher temperature rates-of-rise occur over a longer period, e.g. in kitchens or boiler rooms.
The sensitivity classes A1R, A2R and BR indicate that the thermal differential unit is active in
addition to the thermal maximum unit.
These sensitivity classes are especially well-suited for use in unheated buildings where the
ambient temperature can vary greatly but high temperature rates-of-rise do not last long.
The thermal differential unit enables class A1R/A2R detectors to respond at T<54 °C and class
BR detectors at T<69 °C.
The selection of the sensitivity class also depends on the installation height of the detector.
4.4
14 en | Programming
Automatic Fire Detectors LSN
improved
12/2012 | 8.1 | F.01U.003.448 Operation Guide Bosch Sicherheitssysteme GmbH