Bosch FAS-420-TT Series User manual

FAS-420 series
FAS-420 series
Aspiration smoke detector LSN improved
FAS‑420‑TP series | FAS‑420‑TT series
en Operation guide

Aspiration smoke detector LSN improved Table of contents | en 3
Bosch Sicherheitssysteme GmbH Operation guide 2020.04 | 6.1 | F.01U.029.275
Table of contents
1Safety 6
2General 6
2.1 Introduction 6
2.2 Warranty 6
2.3 Copyright 6
2.4 Disposal 7
3Technical specifications 7
3.1 Product description 7
3.2 Areas of application 9
3.3 System Overview 12
3.4 Functions 12
3.5 FAS‑420 Aspiration smoke detector series and accessories 14
3.5.1 Overview 14
3.5.2 FAS‑420 Connections 15
3.5.3 FAS‑420‑TP1/FAS‑420‑TP2 LEDs 16
3.5.4 FAS‑420‑TT1/FAS‑420‑TT2 LEDs 16
3.5.5 FAS‑ASD‑DIAG Diagnostic Software 17
3.5.6 Remote Indicators 17
3.5.7 Device Mounting 18
3.5.8 Measures for reducing operating noise 18
3.6 Pipe system components 19
3.6.1 Overview 19
3.6.2 Air sampling openings 20
3.6.3 Ceiling lead-through 21
3.6.4 Air-return pipe for pressure areas and atmospheric loads 22
3.6.5 Air filters for dusty areas 23
3.6.6 Water Separator for Humid Areas 23
3.6.7 Detonation safety barrier for potentially explosive areas 24
3.7 Scope of delivery: Smoke aspiration system 25
3.8 Technical specifications 27
3.8.1 FAS‑420 Aspiration smoke detector series 27
3.8.2 FAS‑420 Aspiration smoke detector series - SL variants 28
3.8.3 Pipe system 30
3.8.4 Smoke aspiration system components 30
4Planning 31
4.1 Regulations 32
4.2 Principles of pipe planning 33
4.3 Airflow monitoring 36
4.4 Defining the response sensitivity 37
4.5 Planning limits 38
4.6 Standard pipe planning 39
4.6.1 Determining the necessary accessories 39
4.6.2 Pipe planning with pipe accessories 39
4.7 Pipe planning for single-hole monitoring 47
4.8 Simplified pipe planning 53
4.9 Planning for long pipe feed lines 56
4.10 Planning with acceleration openings 57
4.11 Planning for forced airflow 67

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4.12 Project planning with branch pipes 70
4.13 Planning with air sampling hose 72
4.14 Planning with air return 73
4.15 Power supply 74
5Installing the Aspiration smoke detector 75
5.1 General 75
5.2 Installing the detector module 76
5.3 Settings on the unit motherboard 77
5.3.1 Setting the detector address 77
5.3.2 Setting the fan voltage 78
5.3.3 Setting the fan voltage (SL variant) 78
5.3.4 Number of detector modules 78
5.4 Installing the unit 79
5.5 Connection to the Fire panel 81
5.5.1 Electrical connection 81
5.5.2 LSN Configuration 82
5.5.3 Parameter settings via RPS (Remote Programming Software) 82
5.6 Connecting an External Detector Alarm Display 83
5.7 Data Logging 83
5.8 Replacing a detector module 84
6Installation of the pipe system 85
6.1 Length Change of the Pipe System 86
6.2 Air sampling openings 87
6.3 Ceiling Lead-through 89
6.4 Monitoring with forced airflow 89
6.4.1 Detection at intake and exhaust openings 89
6.4.2 Detection in the Bypass 90
6.5 Air filter 91
6.5.1 Installing the Air Filter Box 91
6.5.2 Filter Change on the Air Filter Box 91
6.6 Air-return Pipe 92
6.7 Three-way Tap 93
6.8 FAS‑ASD‑WS Water Separator 94
6.9 Detonation Safety Barrier 95
6.10 Test Adapter 95
7Commissioning 96
7.1 Preparation 96
7.2 Calibrating the airflow sensor 97
7.2.1 Air-Pressure-Independent Calibration 97
7.2.2 Air-Pressure-Dependent Calibration 98
7.3 Testing the detector module and alarm transmission 99
7.4 Checking Malfunction Transmission 99
7.5 Checking airflow monitoring 99
7.6 FAS‑420 Functional test 100
7.6.1 Preparations for the functional test 100
7.6.2 Conducting the functional test 101
8Maintenance 102
8.1 Visual check 102
8.2 Flash code table 102

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8.2.1 1 Flash - Error: Internal Voltage Monitoring 1 102
8.2.2 2 Flashes - Error: Internal Voltage Monitoring 2 103
8.2.3 3 Flashes - Error: Fan Voltage Monitoring 103
8.2.4 4 Flashes - Error: Air Pressure Correction Voltage Monitoring 104
8.2.5 5 Flashes - Error: Programming Error 105
8.2.6 6 Flashes or 7 Flashes - Error: Internal Error 1 or Internal Error 2 105
8.2.7 8 Flashes: Unit Initialization 105
8.3 Detector Module and Alarm Transmission 105
8.4 Pipe system 106
8.5 Check the airflow sensor calibration 106
8.6 Airflow monitoring 108
8.7 Malfunction Transmission 108
8.8 Maintenance intervals 108
9Appendix 109
9.1 DIP Switch Settings for Detector Addresses 110
9.2 Air Pressure Correction Tables for Airflow Sensor Calibration 111
9.2.1 Equipment protection 111
9.2.2 Space Protection (I-pipe System) 113
9.2.3 Space Protection (U, Double U, and H-pipe System) 115
9.3 Planning without filter 116
9.3.1 Without any other pipe accessories 117
9.3.2 With water separator 118
9.3.3 With detonation safety barrier 118
9.4 Planning with air filter 119
9.4.1 Without any other pipe accessories 120
9.4.2 With water separator 120
9.4.3 With detonation safety barrier 121
9.5 Commissioning/Service Test Record for FAS-420 series Aspiration smoke detectors 121
Index 124

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1 Safety
The following symbols identify points in this operation guide that require particular attention
in order to guarantee smooth operation and prevent damage.
Notice!
Operational malfunction can be prevented and operational improvements can be achieved by
observing these instructions.
!
Caution!
This symbol warns against actions and behavior which, if disregarded, could cause property
damage.
!
Warning!
This symbol warns against actions and behavior which, if disregarded, could cause personal
injury.
2 General
2.1 Introduction
This operation guide describes the smoke aspiration systems featuring FAS-420 series
Aspirating Smoke Detectors and the associated aspiration pipe system.
The FAS-420 designation in this operation guide refers to all FAS-420 series versions. Specific
references are made to differences between the individual versions.
2.2 Warranty
The operation guide is subject to technical modification without prior notice and makes no
claim to completeness. Our "delivery and installation conditions" apply as a matter of
principle. Warranty and liability claims in case of personal injury and property damage cannot
be asserted if they are based on one or more of the following causes:
– Insufficient attention to the instructions with respect to planning, installation of the
aspirating smoke detector, installation of the pipe system, commissioning and
maintenance
– Use of the smoke aspiration system contrary to the regulations
– Insufficient monitoring of wearing parts
– Faulty repairs
– Arbitrary constructional changes to the smoke aspiration system
– Acts of God.
Bosch Sicherheitssysteme GmbH, hereinafter referred to as Bosch, assumes no liability for
damage or malfunction arising through failure to comply with this operation guide.
!
Caution!
The equipment may only be installed by authorized and qualified personnel!
2.3 Copyright
The copyright to this operation guide remains with Bosch.

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This operation guide is intended exclusively for installation engineers and their employees.
Reprinting this operation guide or extracts thereof is permitted for internal purposes only.
2.4 Disposal
Unusable electrical and electronic devices or modules must not be disposed of with normal
household refuse. They must be disposed of in compliance with the applicable regulations
and directives (e.g. WEEE in Europe).
3 Technical specifications
3.1 Product description
Aspirating Smoke Detectors from the FAS-420 series are active fire detection devices that are
connected directly to the Local SecurityNetwork (LSN) improved version for early fire
detection. They are used for space and equipment protection as well as for monitoring air
conditioning units or ducts (provided that the FAS-420 is installed outside of these units or
ducts). You can also pinpoint the exact location of the fire using the innovative fire source
identification operation.
FAS-420 Aspiration smoke detector series were developed specifically for connection to Bosch
fire panels with LSN improved version technology and therefore offer the following extended
features:
– Flexible network structures, including T-tapping with no additional elements
– Up to 254 LSN-improved elements per loop or stub line
– Unshielded cable can be used.
The FAS-420 series also offers all the established benefits of LSN technology. The operating
data and fault messages can be read off the fire panel's operating and display unit.
Variants
The FAS-420-TP1, FAS-420-TP2, FAS‑420‑TP1‑SL and FAS‑420‑TP2‑SL variants feature LED
displays indicating operating mode, faults and alarms (the FAS‑420‑TP2 and FAS‑420‑TP2‑SL
have two alarm displays). The FAS‑420‑TT1, FAS‑420‑TT2, FAS‑420‑TT1‑SL and FAS‑420‑TT2‑SL
offer differentiated alarm displays (info, internal and main alarm) as well as a 10-segment
smoke level display (on the FAS‑420‑TT2 and FAS‑420‑TT2‑SL, all alarm and smoke level
displays are doubled).
The FAS‑420‑TP1, FAS‑420‑TP1‑SL, FAS‑420‑TT1 and FAS‑420‑TT1‑SL variants are each fitted
with a detector module.
The FAS‑420‑TP2, FAS‑420‑TP2‑SL, FAS‑420‑TT2 and FAS‑420‑TT2‑SL variants each have two
integrated detector modules. Two aspiration pipes can be connected, enabling two areas to
be monitored. This effectively doubles the monitoring area.
Dual-detector dependency
The use of two detector modules in variants FAS-420-TP2 and FAS-420-TT2 also enables a
dual-detector dependency to be realized. This means that one area can be monitored by two
pipe systems.
Two alarm stages
Alternatively, the FAS-420-TP2 and FAS-420-TT2 can have two alarm stages configured. A pipe
system is connected via a pipe adapter on two detector modules. Selecting different response
sensitivities for the detector modules enables the time-staggered triggering of two main
alarms.
Dual-zone dependency

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Connecting to the FPA‑5000 Modular Fire Panel and programming using RPS software also
permit a dual-zone dependency.
Sensitivity
Three detector module versions are available for the FAS‑420 aspirating smoke detector
series:
– DM‑TT‑50(80) with a response sensitivity of up to 0.5%/m (0.8%/m) light obscuration
– DM‑TT‑10(25) with a response sensitivity of up to 0.1%/m (0.25%/m) light obscuration
– DM‑TT‑01(05) with a response sensitivity of up to 0.015%/m (0.05%/m) light obscuration
Depending on the detector module used, the FAS-420-TT1 and FAS-420-TT2 models can
achieve a resolution ten times higher for displaying up to 0.05%/m (0.08%/m), 0.01%/m
(0.025%/m) or 0.0015%/m (0.005%/m) light obscuration. Further sensitivity levels to suit the
application range can be selected via the RPS programming software.
Notice!
The sensitivity value is based on measurements with standard test fires (old value in
brackets).
The new High-Power-Light-Source technology permits a broad detection spectrum over all
standardized fires.
LOGIC×SENS
The intelligent signal processing LOGIC·SENS distinguishes between deception variables and
fire events in order to prevent false alarms.
Reliable airflow monitoring
Analogous to point-type smoke detectors, which are monitored electronically for wire breaks
and short-circuits, highly sensitive and dependable airflow monitoring is required for smoke
aspiration systems. The airflow sensors used in the FAS-420 series reliably detect
malfunctions such as pipe breakage or obstructions in the air sampling openings.
Airflow monitoring is temperature-compensated and can be set depending on the air pressure.
The small airflow unit also contains a dynamic airflow sensor that enables a response to small
and fast changes in the airflow.
Patented air sampling openings
The air sampling openings of the pipe system require clearly defined bore diameters that
depend on the planning and design. These precise air sampling openings are created using
patented aspiration reducing film sheets, marking tape, and clips, which not only permit easy
installation, but also prevent "whistling" noises. Another advantage is the quick and easy
detection and checking of the air sampling opening diameters.
Point-type detector projection
The system’s aspiration points can be equated with point-type smoke detectors. The
monitoring areas can therefore be planned in accordance with the applicable national
regulations.
Diagnostics
A system with FAS‑ASD‑DIAG Diagnostic Software, which enables quick and convenient error
containment, is available for maintenance and service. The current and stored (max. 72 hours)
unit status is read out to the diagnostic appliance via the unit's infrared port. The data is
transmitted from the diagnostic appliance to a laptop via a USB cable.
Selecting the fan voltage
The fan voltage for special planning can be increased from 6.9V to 9V by relocating the fan
jumper. This increases the air transport speed and therefore reduces detection time.

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For ‑SL variants, the fan voltage can also be set to 6.5V.
3.2 Areas of application
Thanks to their detection principle, FAS-420 aspirating smoke detectors represent an
extremely versatile fire protection solution.
Principle
Air samples are taken from the monitoring range by a pipe system with defined aspiration
borings and then fed to the detection module.
This is especially well-suited for areas in which point-type detectors cannot be used or can
only be used under certain circumstances. These include:
– Areas that are difficult to access, in which point detectors are difficult to install and
maintain
– Air-conditioned areas
– Areas that require the earliest detection possible
– Areas with a height greater than that allowed for point detectors
– Areas in which point detectors are not desired for aesthetic reasons
– Areas in which strong electromagnetic fields occur
– Areas that are exposed to high or low temperatures
– Areas with contaminated air that require filter elements
– Areas that must be protected against vandalism.
Space protection
The FAS-420 series is suitable for monitoring areas such as
– Those with double floors, false ceilings
– Tunnels, ducts, barely accessible hollow spaces
– Storage, high-rise warehouses, elevator shafts
– Museums, cultural institutions
– Hotel rooms, hospital rooms, offices, prison cells, train compartments
– Freezer storage
FAS / FCS
1
2
TITANUSMICRO·SENS®
E
D
C
B
A
10
9
8
7
6
5
4
3
2
1
TITANUSMICRO·SENS®
E
D
C
B
A
10
9
8
7
6
5
4
3
2
1
Principle of area monitoring with FAS-420 series Aspirating
Smoke Detectors
1 Room pipe system
2 Double-floor pipe system
Area monitoring with air-conditioning
Area monitoring occurs
– In rooms with air-conditioning for server rooms etc.
– In ventilation ducts
– In double floors, false ceilings
– In IT rooms, e-distributor rooms, transformer cells

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– On air-conditioning units (see figure below) or
– In the bypass in air-conditioning ducts.
FAS / FCS
FAS / FCS
FAS / FCS
1
2
Monitoring options for an air-conditioning unit or an air-
conditioning duct (depiction of principle)
1 Air-conditioning duct
2 Air-conditioning unit
The FAS-420 Aspirating Smoke Detector can be used for early fire detection in areas with
special-purpose air conditioning.
Thanks to its high sensitivity, expensive goods and equipment can be monitored reliably. The
aspirating smoke detectors from the FAS-420 series are therefore especially suitable for areas
of application:
– Where early intervention is essential due to a high value concentration
– Where equipment must always be operational
– Where highly sensitive detection is necessary (e.g. in areas where, due to built-in filter
elements, the air contains a low concentration of smoke particles)
– Where high air-exchange rates prevail.
Equipment protection
Equipment monitoring involves the direct monitoring of an object. These can be unventilated
or force-cooled units or cabinets, e.g.
– Distributor cabinets, switching cabinets
– Telephone-switching equipment
– Measuring, control, and regulation equipment.

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1
FAS / FCS
Principle of equipment monitoring with FAS-420 series
Aspirating Smoke Detectors
1 Clicking
Area monitoring in noise-sensitive areas
All ‑SL variants are equipped with an extremely quiet fan and can therefore be used in noise-
sensitive areas, such as
– Hotels
– Hospitals
– Libraries
– Prisons etc.
1
FAS / FCS
Principle of equipment monitoring with FAS-420 series
aspirating smoke detectors
1 Clicking

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3.3 System Overview
The smoke aspiration systems comprise an aspirating detector and pipe system.
The aspirating smoke detector comprises the detector module for detecting the smoke
aerosols, the aspiration unit for transporting the air samples to the detector module and the
airflow sensor for monitoring the pipe system for breakage and obstructions.
The pipe system comprises essentially pipe and fittings. The standard pipe system is made
from PVC or ABS. The pipes used for equipment monitoring should be halogen-free.
Each air sampling opening in the pipe system represents a point detector in the planning.
2
7
6
5
3
1
A
4
Overview of the aspirating smoke detector
A Pipe system
FAS-420 Aspirating smoke
detector
1 Smoke aspiration pipe
2 Air intake
3 Air sampling openings
4 Detector module
including airflow
monitoring
5 Housing
6 Aspiration unit
7 Air outlet
To guarantee reliable operation even under the most difficult conditions (clean rooms,
recycling area), there are numerous accessories available, such as air filters, water separators
and detonation safety barriers.
3.4 Functions
Air samples are taken from the area to be monitored via the aspiration unit. They are fed via a
pipe system with defined air sampling openings to the sensitive detection module.
Detector module
Depending on the response sensitivity of the detector module in use and programmed alarm
threshold, the FAS-420 Aspiration smoke detector series triggers the alarm when the
corresponding light obscuration threshold is reached. With the FAS‑420-TP1 and the FAS‑420-
TP2, the alarm is displayed via the alarm LED and/or two alarm LEDs on the unit and
transmitted to a connected fire panel. The FAS‑420‑TT1 and FAS‑420‑TT2 versions offer
differentiated LED displays for info, internal and main alarm. Internal and main alarms are
transmitted to the fire panel (with FPA‑5000 release 2.1; additionally with info alarm from
release 2.5 or above).
Various delay times can be programmed for the alarm thresholds, as well as for displaying and
transferring malfunctions. Alarm messages are saved and are reset after the cause has been
eliminated.
LOGIC×SENS
The LOGIC·SENS intelligent signal processing compares the measured smoke level with
known disturbance variables and decides whether something is an alarm or deception. LOGIC
SENS can be activated or deactivated using the fire panel's programming software.

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Detector module monitoring
Each detector module is monitored for contamination, signal malfunction and removal. Soiling
of the detector module has no effect on its sensitivity. With all variants, any malfunction is
displayed via the malfunction LED and transferred to the fire panel. Malfunctions caused by
brief environmental fluctuations can be eliminated with a time-delayed setting.
Airflow Monitoring
An airflow sensor checks the connected pipe system for breakage and obstruction.
The airflow sensor can – depending on the configuration of the pipe system – detect at least a
50% obstruction to a complete obstruction of the air sampling openings and a breakage in the
pipe system that results in a 50% loss from the air sampling openings. Should the fan fail, the
airflow in the pipe system is interrupted and this causes a blockage message. Airflow
monitoring is temperature-compensated and can be set depending on the air pressure.
On expiry of a defined delay, the malfunction is displayed on the aspirating smoke detector
and the message is transmitted to the fire panel. The monitoring window thresholds can be
modified to suit the environmental conditions (see Airflow Monitoring).
The principal signal curve of the airflow sensor is indicated in Airflow Monitoring.
S
t
4
7
8
6
1
2
5
3
Example of the signal process of the Airflow sensor in case of
malfunctions
S Airflow sensor signal
t Time
1 Normal airflow
2 Airflow too weak
3 Airflow too strong
4 Breakage
5 Obstruction
6 Monitoring window
7 Delay
8 Malfunction message
Fault Indication
An imminent detector module or airflow malfunction generates a malfunction message that is
displayed on the FAS-420.
Flash code for malfunction detection
Malfunctions and certain device statues are displayed using various LED flash codes on the
detector module's electronics PCB. Thus it is possible to differentiate quickly among
malfunctions that can be caused by a defective detector module, an obstruction, or a break in
the pipe system.
Resetting via fire panel
A malfunction message is reset via the connected fire panel. Alarm and malfunction messages
are displayed simultaneously on the unit via the Local SecurityNetwork LSN using the reset
function on the detector line.
Calibrating the airflow sensor
Automatic airflow sensor calibration makes it significantly easier to start the FAS-420. The
initialization phase is carried out according to or independently of the air pressure as desired.

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To set the FAS-420 to the airflow typical for the pipe network, an airflow initialization (flow-
init) procedure is carried out. This must be done for each unit once at the start after
installation, each time the pipe system is replanned/redesigned and after changing the fan
voltage. This enables the unit to determine and save the airflow typical for the pipe network.
Pipe system
A pipe system with an overall length of up to 300m can be connected to FAS-420 series
aspirating smoke detectors over a maximum of 32 aspiration points. Two pipe systems can be
connected to both the FAS‑420‑TP2 and FAS‑420‑TT2 variants. The entire pipe system then
has a total length of 2 x 280m and a maximum number of 2 x 32 aspiration points.
3.5 FAS‑420 Aspiration smoke detector series and accessories
3.5.1 Overview
2
A
3
C
EG
F
1
B
D
FAS / FCS
Overview of FAS-420 series aspirating
smoke detectors and accessories
1 Pipe system(s)
2 Connections to fire panel/power supply
3 Air-return pipe
A Vibration absorber (sold separately)
B MT-1 unit mounting
C Detector module
D DIAG Diagnostic Software with connection
cable
E Cable bushings (1xM20, 2xM25)
F Test pipe
G Test adapter
FAS-420 Aspiration smoke detector series has the following components:
– Plastic housing
– Plastic connection pieces
– Integrated air-return pipe
– Connection for pipe with 25mm external diameter
– Aspiration unit with optimized air supply
– Motherboard with interface for diagnostics system, LSN connections, connection for
shield wire, as well as DIP switch for address setting
– Supplementary package with cable bushings (1xM20, 2xM25)
– FAS-420-TP1 /FAS-420-TP2: optical LEDs for alarm, malfunction and operation
– FAS-420-TT1 /FAS-420-TT2: smoke level LED(s), LEDs for info, internal and main alarm,
malfunction and operation
– 1 detector module (for FAS-420-TP1 and FAS-420-TT1) and/or 2 detector modules (for
FAS-420-TP2 and FAS-420-TT2).

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Notice!
Only type DM‑TT‑50(80), DM‑TT‑10(25) and DM‑TT‑01(05) detector modules with VdS
certification can be used in the standard units from the FAS-420 series. The detector modules
must be ordered separately.
Information on other accessories for special applications can be found in
– FAS‑ASD‑DIAG Diagnostic Software, page 17
– Remote Indicators, page 17
– Device Mounting, page 18
– Ceiling lead-through, page 21
– Water Separator for Humid Areas
– Detonation safety barrier for potentially explosive areas, page 24 .
3.5.2 FAS‑420 Connections
1
23
1
4
5
FAS -420 series
FAS -420 series
FAS / FCS
Figure3.1: FAS-420 connections (see table on next page for explanations)
Position in
figure
Function Explanation
FAS-420 series 1 Cable bushing for connection of fire panel
and additional power supply (input/
output)
1 x M20, for cable diameters of
8-12mm
2 Pipe system 1 connection For Ø 25mm pipe system
3 Pipe system 2 connection (only for devices
with a two pipe system)
For Ø 25mm pipe system
4 Connection for air-return pipe
5 Cable bushing for connection of fire panel
and additional power supply (input/
output)
2 x M25 for cable diameters of
9-14mm (expandable to 14-
18mm)

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3.5.3 FAS‑420‑TP1/FAS‑420‑TP2 LEDs
TP2
1
2
FAS-420 series
FAS-420 series
FAS | FCS
1
2
3
1
4
5
II
II
III
I
Figure3.2: FAS‑420‑TP1/TP2, FCS‑320‑TP1/TP2 displays
FAS-420-TP Designation LED Color Explanation
I Operation Green Operation
II Alarm 1Red Alarm
III Fault Yellow Fault
– in the pipe system
– of a detector module
– caused by fan failure
1 Two alarm LEDs on the FAS-420-TP2
3.5.4 FAS‑420‑TT1/FAS‑420‑TT2 LEDs
i1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
12
1
2
3
1
4
5
III IV II
I
III
IV
FAS-420 series
FAS-420 series
FAS-420-TT2
Figure3.3: FAS‑420‑TT1/TT2, FCS-320-TT1/TT2 displays
FAS-420‑TT Designation LED 1Color Explanation
I Operation Green Operation
II Fault Yellow Fault
– in the pipe system
– of a detector module
– caused by fan failure
III Main alarm Red 100% smoke level
Internal alarm 1Red 66% smoke level
Info alarm 1Red 33% smoke level

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IV Smoke level display 1 to 10 110 yellow
LEDs
Current smoke level
1 All displays doubled on the FAS-420-TT2
3.5.5 FAS‑ASD‑DIAG Diagnostic Software
FAS-
DIAG
Figure3.4: Diagnostic software for importing and reading out the device data
The FAS‑ASD‑DIAG Diagnostic Software enables the saved and current statuses of the FAS-420
and error messages to be saved on a PC or laptop.
Data is transmitted to the diagnostic appliance via the infrared port of the aspirating smoke
detector. The USB cable provided is used to transmit the data from the diagnostic appliance
to the PC/laptop (see figure above).
Diagnostic messages remain saved in the FAS-420 for at least 3 days in order to be able to
evaluate even short, sporadically occurring errors (e.g. in case of changed operating
conditions). Resetting the FAS-420 via the diagnostic software deletes all saved diagnostic
messages. The software also allows the deletion of error messages.
Notice!
The diagnostic software can be used to save in file format all stored and current diagnostics
data and any settings made via the fire panel programming software. To be able to compare
the data read out, save each file under a different file name.
3.5.6 Remote Indicators
A remote indicator must be connected if the aspirating smoke detector is not directly visible
or has been mounted in false ceilings or floors.
The external detector alarm display is installed in an obvious place in halls or entrances of the
building section or areas concerned.
The display is connected to the unit motherboard via the "X6 ext. Display" (D-/D+/V-/V+). Only
digital remote indicators made by Wagner can be used for this connection; these are available
by separate order.
Alternatively, FNS‑420‑RLSN Strobes can be connected via LSN and configured via
FSP‑5000‑RPS.

18 en | Technical specifications Aspiration smoke detector LSN improved
2020.04 | 6.1 | F.01U.029.275 Operation guide Bosch Sicherheitssysteme GmbH
3.5.7 Device Mounting
12
FAS-42 0 series
FAS-42 0 series
Mounting for FAS-420 series Aspirating Smoke Detector
1 Horizontal installation
2 Vertical installation
The MT-1 unit mounting is used if a direct wall installation is not possible, e.g. installation on
racks.
3.5.8 Measures for reducing operating noise
1
1
2
3
4
FAS-420 series
Absorption of the operating noises caused by airflows
1 Smoke aspiration pipe
2 Flexible hose
3 Fitting
4 Vibration absorbers
Vibration absorbers
The fans of the aspirating smoke detectors cause a noise level of approx.45dB(A). Mounting
the FAS-420 onto vibration absorbers can effectively reduce noise transmission through the
installation elements. This results in a reduction in the noise level from 1to 2dB(A).
Additional operating noises may be caused by vibrations on the pipe system, which are
generated by the air flowing through it. This can be remedied by inserting a corrugated hose
(approx.15cm long) between pipe system and aspirating smoke detector to create a flexible
transition.
In noise-sensitive areas, the sound level can also be reduced by installing a piece of plastic
pipe approximately 100mm long into the air outlet opening of the unit. This is done by
breaking out the pre-punched opening in the protective grille (e.g. using a small edge cutter).
All ‑SL variants are equipped with an extremely quiet fan that limits the noise level to
31dB(A). Thanks to the additional sound damper, fan noise can be reduced to 23dB(A); this
ensures that the detector is in accordance with DIN4109 for living and sleeping areas.

Aspiration smoke detector LSN improved Technical specifications | en 19
Bosch Sicherheitssysteme GmbH Operation guide 2020.04 | 6.1 | F.01U.029.275
3.6 Pipe system components
3.6.1 Overview
FAS-420-TM series
A
A
A
4
5
3
2
7
6
8
9
10
11
12
13
1
14
A
B
Pipe system components
A Pipe system connection
B Smoke aspiration pipe
1 Connection for test
adapter
2 T-fitting
3 Air filter
4 Water separator
5 Detonation safety barrier
(not permitted for
EN54‑20 or ISO
7240-20)
6 90° pipe bend
7 Aspiration hose for
ceiling lead-through
8 Ceiling Lead-through
9 Fitting
10 Double threaded joint
11 90° pipe elbow
12 45° pipe elbow
13 Aspiration reduction
14 End cap
During planning/design, a distinction is drawn between area monitoring and equipment
monitoring. For both applications, PVC pipes and halogen-free pipes can be used but the
restrictions of EN 54.20 must be observed. The pipes used for equipment monitoring should
be halogen-free.
The figure shows essential accessory components that can be selected for the application
concerned.
The pipe system must be constructed using pipes with an external diameter of 25 mm and the
associated fittings.
If the maximum permissible pipe lengths are used, then for the pipe returns, pipes with an
exterior diameter of 40mm and the appropriate fittings must be used.
Blowing-out system
In areas that are susceptible to dust particles or icing, it may be necessary to blow out the
aspiration pipe system and its air sampling openings. The figure below shows a manual
blowing-out system with a three-way tap.

20 en | Technical specifications Aspiration smoke detector LSN improved
2020.04 | 6.1 | F.01U.029.275 Operation guide Bosch Sicherheitssysteme GmbH
FAS-420-TM series
A
1
2
B
Components of manual blowing-out systems
A Blast air supply connection
B Pipe system connection
1 Three-way tap
2 25mm aspiration pipe
Aspiration reducing clips
3.6.2 Air sampling openings
Aspiration reducing film sheets
An air sampling opening is a 10mm bore in the aspiration pipe that is covered with a patented
aspiration reducing film sheet with the required opening diameter. The size of the opening
depends on the structure of the pipe system (see Planning).
The aspiration reducing film sheet is secured with marking tape to prevent it from becoming
displaced. The marking tape is a transparent sticky film with red edges and a 10 mm hole. It is
placed over the aspiration reducing film sheet so that the air sampling opening is not
concealed and can be seen from long distances.
1
3
36
2
4
4
45
2
Air sampling opening with aspiration reducing film sheet and
marking tape
1 Smoke aspiration pipe
2 Air sampling opening
with aspiration reducing
film sheet
3 Marking tape for
aspiration reducing film
sheet
4 Air sampling opening
5 Fire red (RAL3000)
6 Transparent
Aspiration reducing clips
In areas susceptible to obstructions or icing, special, patented ASD aspiration clips with
flexible aspiration reductions are used (see figure below).