Aspiration smoke detector | Aspirating Smoke Detectors | LSN Improved | BOSCH

• FAS‐420 Aspiration smoke detector series LSN improved

• High deceptive alarm immunity with intelligent signal processing LOGIC·SENS

• Innovative airflow monitoring including single-hole monitoring detects obstruction and breakage

• Initial set-up made easy by automatic initialization

• Maintains LSN loop functions in the event of wire interruption or short-circuit thanks to two integrated isolators

• SL-versions: Noise reduction to 38 dB(A) by extremely quiet fan and up to 34 dB(A) with additional sound absorber

The FAS‐420 Series Aspiration Smoke Detectors are specially designed for direct connection to the Local SecurityNetwork LSN improved version with the
extended features. They are active fire detection systems for early fire detection in area and equipment monitoring, as well as for the monitoring of air conditioning units or ducts.They have the latest detection technology. Their resistance to contamination, the temperature compensation of the sensor signals and initialization in relation to air pressure ensure reliable operation even under extreme environmental conditions. The SL-versions with extremely quiet fan are applicable for noise sensitive areas, for example hotel
rooms, hospitals and bureaus. The noise was reduced to 38 dB(A) and up to 34 dB(A) with additional sound absorber.

Pos.  Description
1      Pipe system/air intake
2      Air sampling openings
3      Housing
4      Detector Module incl. airflow sensor
5      Aspiration unit
6      Air outlet

Functions

The aspiration unit takes air samples from the monitoring area through a pipe system with defined air sampling openings and passes the samples to the
Detector Module.Depending on the response sensitivity of the used Detector Module, the Aspiration Smoke Detector triggers an alarm when the appropriate smoke density is reached. This alarm is displayed via the alarm LED on the unit and is transmitted to the fire panel.An airflow sensor checks the connected pipe system for breakage and obstruction.
Intelligent signal processing LOGIC·SENS compares the measured smoke level with known disturbance variables and decides between alarm and deception.For the display and transmission of alarm and faults various delay times can be selected.
Each Detector Module is monitored for contamination,signal malfunction and device removal. Malfunctions and certain device states are displayed using various LED flash codes on the Detector Module's electronics PCB.
A fault message is reset via the connected fire panel.Via the Local Security Network LSN the alarm and fault messages on the unit are reset simultaneously with the detector line.
There are three different Detector Modules available for the FAS‐420 Series Aspiration Smoke Detectors.These modules have different response sensitivities:

Notice
The sensitivity is based on the measurements during Standard Test Fires (previous measure-ment in brackets).
The FAS‐420‐TP2, FAS‐420‐TT2, FAS‐420‐TP2‐SL and
the FAS‐420‐TT2‐SL runs with two Detector Modules.
Two air sampling pipe systems can be connected to
monitor two areas. When monitoring only one area
with two pipe systems, dual-detector dependency may
be implemented. Connection to AVENAR panel series,
FPA‐5000 or FPA‐1200 and programming via
FSP‐5000‐RPS also allows for dual-zone dependency.

Address allocation

The integrated DIP switches are used to select between automatic or manual addressing with or without auto detection.

The following settings are possible:

Features of improved LSN

The Aspiration Smoke Detectors in the 420 Series offer all the features of the LSN technology improved version:
  • Flexible network structures including T‐tapping without additional elements
  • Up to 254 LSN-improved elements per loop or stub line
  • Unshielded cable can be used
In addition, the FAS‐420 Series offer all the established benefits of LSN technology. Operating data and fault messages can be found on the panel controller. In the event of an alarm, individual detector identification is transmitted to the fire panel.

Model variants FAS‐420 Series
The variants FAS‐420‐TP1 and FAS‐420‐TP2 are the cost-effective Aspiration Smoke Detectors for universal use with LED displays for operation, malfunction, and alarm (two alarm indications on the FAS‐420‐TP2). They are also available as silent versions FAS‐420‐TP1‐SL and FAS-420-TP2‐SL.The FAS‐420‐TT1 and FAS‐420‐TT2 (FAS‐420‐TT1‐SL and FAS‐420‐TT2‐SL) offer differentiated alarm indications (info, pre, and main alarm) as well as a smoke level display in 10 levels (with the FAS‐420‐TT2 all alarm and smoke level displays are doubled).Depending on the used Detector Module, a resolution of the sensitivity indication of up to 0,0015 %/m,0,01 %/m or 0,05 %/m can be selected.

Regulatory information

Installation/configuration notes

• For connection to the addressable fire panels with the extended system          parameters of LSN improved version.
• Programming is carried out via RPS.
• The fan requires a separate power supply.
• An external detector alarm display for connection to the FAS‐420 Series          Aspiration Smoke Detectors can be ordered separately.

Planning of the pipe system
• In planning, a distinction is made between area monitoring and equipment    monitoring.
• PVC pipes and halogen-free aspiration pipes can be used.
• For equipment monitoring, halogen-free pipes should be used.
• The air sampling pipe system should be arranged such that any fires can        be detected at the initial stage.
• The pipe system including air sampling openings must always be         symmetrical in design (±10%deviation).
• If structural issues make it impossible to maintain this symmetry, the           following conditions apply:

  – The number of air sampling openings and the length of the shortest and        longest pipe branch within the pipe system must not exceed a quantity          ratio of 01:02.
 – The distance between neighboring air sampling openings on the aspiration      pipe must be even (max. deviation ± 20%).
 – The diameters of the air sampling openings are determined separately for    each pipe branch. The diameters depend on the total number of air       sampling openings in the pipe branch in question.

• Greater distances between the Aspiration Smoke Detector and aspiration        pipe are specified for pipes with a 40 mm diameter.
• Depending on the geometrics of the area, the I-, U-,M- or double U-pipe       system is utilized.

Notice
Take notice when planning that the fans of the Aspiration Smoke Detectors produce a noise level of 45 dB(A).

Pos.    Designation
1         I-pipe system
2         U-pipe system
3         M‐pipe system
4        Double U-pipe system

• For a faster detection, it is best to select several short branches rather than    a few long branches (U and double-U pipe systems preferable).
• Bends are preferable to angles in the event of directional changes.
• In order to increase transport speed in critical application areas, the fan       voltage can be increased from 6.9 V to 9 V.

Planning limitations
• Pipe length between two air sampling openings:

– Minimum 4 m (0.1 m with Simplified Pipe Plan-ning

– Maximum 12 m.

• The maximum monitoring area per air sampling opening corresponds to the maximum monitoring area of point-type detectors according to valid
planning guidelines.
• Maximum of 32 air sampling openings per pipe system
• Max. pipe length / max. total monitoring area per pipe system:

– 300 m / 2880 m2 (VdS-compliant)

– With two Detector Modules: 2*280 m / 5760 m2

Aspiration pipe planning
Aspiration pipe systems are constructed according to planning specifications with the common pipe components as well as components for special
applications, e. g. Water Separator or Detonation Safety Barrier.
All borings for the smoke aspiration systems are made to a diameter of 10 mm and the exact aspiration openings are implemented by means of the patented Aspiration Reducing Film Sheets. For each aspiration hole a Aspiration reducing Film Sheet with corresponding punch diameter and Marking Tape must be provided.

 Notice
For applications in areas where a blowing-out system is necessary (e. g. low-temperature areas or where high levels of dust accumulate), special suction reducers with plastic clips are available as separate items.

For further information on the following aspects of FAS-420 planning, refer to the operation guide (F.01U.029.275):
• Specifying the sensitivity
• Standard planning in line with VdS
• Planning with long pipe feed lines
• Planning for high-rise warehouses
• Simplified Planning
• Planning with single-hole monitoring
• Planning for forced airflow

Technical specifications

Each current consumption was measured at fan
voltage 9V.