BST KLC 20 User manual

Operating Manual
Flame Detector KLC 20 / KLC 21

Content
1 General aspects 4
1.1 Introduction 4
1.2 Warning notes 4
1.3 Copyright protection 5
1.4 Disposal information 5
1.5 Warranty 5
1.6 Obligation of the operating company 6
1.7 Liability disclaimer 6
1.8 Declaration of conformity 7
1.9 Address of the manufacturer 7
2 Safety 8
2.1 Intended use 8
2.2 Requirements on persons 8
2.3 Safety instructions 9
2.4 Safety devices 9
2.4.1 Fundamental aspects 9
2.4.2 Safety devices on the flame detektor 10
2.5 Safety instructions in case of maintenance
and troubleshooting 10
2.5.1 Fundamental aspects 10
2.5.2 Electrical / electronic devices 11
2.5.3 Inspection in accordance with the Ordinance
on Industrial Safety and Health 11
2.5.4 Safety test 11
3 Technical data 12
3.1 General characteristic features 12
3.2 Electrical system, optical system, mechanical system 12
3.3 Weight 13
3.4 Dimensions 13
3.5 Block diagram KLC 20 / KLC 21 13
4 Transport, installation and connection 14
4.1 Scope of delivery 14
4.2 Packaging 15
4.3 Shipping instructions 15
4.4 Dimensions 15
4.5 Installation 16
4.5.1 Mounting flange KLC 16
4.5.2 Viewing angle adapter KLC for radial adjustment 17
4.5.3 Adapter ADP 17
4.6 Connection 18
4.6.1 Electrical connection 18
4.6.2 Connector diagram 18
4.7 Storage 18

5 Description 19
5.1 Functional description 19
5.2 Disturbing frequency cut off (optional) 19
5.3 Optionally function blocks for KLC 19
5.3.1 Relay module for flame detectors RMF 1 19
6 Operation of the flame detektor 20
6.1 Test of the flame detektor 20
6.2 Operating indicator LED 20
6.3 Diagnostic with KLC-Com 20
7 Maintenance and servicing 21
7.1 Cleaning 21
7.2 Maintenance interval 21
7.3 Safety-related check 21
8 Troubleshooting 22
9 Order data 23
10 Accessories 24
CONTENT

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 4
1 | General aspects
1.1 Introduction
This operating manual is an essential guide for the successful and safe operation of the flame
detector. It contains important information on how to operate the system safely, properly
and economically. Observance of these instructions helps to avoid dangers, to reduce repair
costs and downtimes and to increase the reliability and service life of the unit. All illustrati-
ons and drawings in this operating manual are for general illustration purposes and are not
authoritative for the design in detail.
The operating manual must be available on the unit at all times. It must be read and used by
every person who is assigned to work with/on the unit,
for example:
• Operation,
• troubleshooting during operation,
• maintenance,
• maintenance (servicing, inspection, repair) and/or
• transport
The operator should have this confirmed in writing.
1.2 Warning notes
The following warning notes are used in these operating instructions:
DANGER
!
This warning level indicates an imminent hazardous situation. If the hazardous situation is
not prevented, this will result in death or severe injury. Follow the instructions that accom-
pany this warning to prevent the risk of death and severe personal injury.
WARNING
!
This warning level indicates a potentially hazardous situation. If the hazardous situation is
not prevented, this may result in death or severe injury. Follow the instructions that accom-
pany this warning to prevent the potential risk of death and severe personal injury.
CAUTION
!
This warning level indicates a potentially hazardous situation. If the hazardous situation is
not prevented, this may result in slight or moderate injuries. Follow the instructions that ac-
company this warning to prevent the injury of persons.
This warning level indicates potential damage to property. If this situation is not prevented,
it may result in damage to property. Follow the instructions that accompany this warning to
pre-vent damage to property.
NOTICE
A notice indicates additional information that will make the handling of the device easier.
GENERAL ASPECTS

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 5
1.3 Copyright protection
This operating manual has to be treated as confidential. They may only be used by authorised
staff. Access by third parties may only be granted upon written agreement of BST Solutions.
All documents are protected in keeping with the German copyright law.
The disclosure and reproduction of documentation, in whole or in part, as well as the ex-
ploitation and communication of its content shall not be permitted unless expressly stated
otherwise. Offenders are liable for prosecution and the payment of damages.
We reserve all rights to exercise industrial property rights.
1.4 Disposal information
The flame detector is equipped with electrical and electronic components and
must be disposed separate from household waste. Follow the local and actual
regulations for waste disposal.
1.5 Warranty
Read these operating manualcarefully and in full before operating the flame detektor KLC20
/ KLC21!
The manufacturer is not liable for damage or operating malfunctions that result from the
operating manual not being observed. The operating manual must be supplemented by the
operator with operating instructions based on existing national regulations for accident pre-
vention and environmental protection, including information on supervisory and reporting obli-
gations to take account of special operational features, e.g. with regard to work organisation,
work processes and personnel deployed. The recognised technical rules for safe and profes-
sional working also have to be observed in addition to the operating manual and the regula-
tions on accident prevention applicable to the country and place of use.
The warranty shall become void, for example, in the event of:
• inappropriate use
• use of impermissible equipment
• incorrect connection
• prior works that are not part of the supplied product or service
• non-use of original spares and accessories
• conversion, if this has not been approved by BST Solutions
• non-performance of specified maintenance work
It is recommended that the operator of the device concludes a service contract with BST
Solutions. This guarantees that the device is regularly checked by our service staff and en-
sures that any required wearing and spare parts are available without long delivery periods.
This warranty does not cover damage in transit, lens glass breakage (photo element) or other
damage caused by unqualified handling, incorrect adjustment or inadequate maintenance.
NOTICE
NOTICE
GENERAL ASPECTS

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 6
1.6 Obligation of the operating company
The flame detektor KLC20 / KLC21 may cause hazards if it is operated inappropriately or in
an improper condition.
The operating company is under the obligation to operate the machine in proper state only.
The operating company has to secure hazardous areas that exist between BFI devices and
the customer‘s own equipment.
The operating company has to appoint and instruct responsible staff:
• Only deploy trained or instructed staff.
• Clearly set out the responsibilities of the staff with regard to operation, set-up, maintenan-
ce and repair.
• Regularly check that staff are safety conscious and aware of hazards and are observing the
operating instructions.
• Before starting work, staff who are assigned to work with/on the device have to have read
and understood the operating instructions, in particular the chapter on „Safety“, as well as
the relevant regulations.
• The operating manual and relevant regulations have to be stored in such a way that they are
accessible to operating and maintenance staff.
• Set out who will have responsibility for device operation and ensure that this person has
the authority to overrule any unsafe instructions of third parties.
1.7 Liability disclaimer
All technical information, data and guidance on device operation that are contained within
this operating manual are, to the best of our knowledge, correct at the time of printing, taking
into account our present understanding and experience.
We reserve the right to make technical changes with respect to the further development of
the flame detector outlined in this operating manual. No claims can be made based on the
specifications, illustrations and descriptions of this operating manual.
We shall not be liable for damage or operating malfunctions that result from operating errors,
inappropriate repairs or the non-observance of the operating manual. We expressly state that
only original spare parts and accessories approved by us may be used. This also applies to
the components of other manufacturers that have been used.
The installation or use of non-approved spare and accessory parts and any unauthorized
retrofits and modifications are not permitted for safety reasons and exclude any liability by
BST Solutions for consequential damages.
Generally valid legal and other binding regulations on accident prevention and envi-
ronmental protection have to be observed and instructed, in addition to the operating
instructions.
NOTICE
GENERAL ASPECTS

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 7
BST Solutions is liable for possible errors or omissions with the exclusion of additional claims
entered into in the framework of the warranty obligations conceded to in the contract. Claims
for damages, on whatever legal basis they may be, shall be excluded.
Translations into foreign languages are carried out in good faith. We cannot accept any lia-
bility for translation errors; this also applies where the translation has been carried out or
has been commissioned by us. The original text alone shall be binding. Descriptions and il-
lustrations do not necessarily depict the delivered product or a possible spare parts order.
Drawings and graphics are not to scale.
1.8 Declaration of conformity
1.9 Address of the manufacturer
BST Solutions GmbH
Ruegenstr. 7 . 42579 Heiligenhaus . Germany
T [phone] . E-Mail: info@flamonitec-bst.com
www.flamonitec-bst.com
GENERAL ASPECTS
BST Solutions GmbH
Rügenstr. 7
42579 Heiligenhaus
Germany
Tel.: [phone]
Web: www.bst-solutions.de
EU Konformitätserklärung
EC Declaration of Conformity
Produkt Flammenwächter KLC2x mit oder ohne RMF1
Product Flame detector KLC2x with or without RMF1
Typ KLC20, KLC21, KLC22, KLC2002 mit oder ohne RMF1
Type KLC20, KLC21, KLC22, KLC2002 with or without RMF1
Hiermit erklären wir, dass der nachstehend bezeichnete Flammenwächter in seiner Konzipierung und
Bauart sowie in der von uns in Verkehr gebrachten Ausführung den grundlegenden Sicherheitsanfor-
derungen folgender EU-Richtlinien entspricht
This is to confirm that the below described system in its design and type of construction complies with the
provisions of the Directive of the Council of the European Communities on the approximation of the laws of the
member states relating to
Verordnungen
EU/2016/426
Gasgeräteverordnung
Regulations
Gas appliances regulation
2014/35/EU
Niederspannungsrichtlinie
Low voltage directive
2014/30/EU
EMV Richtlinie
EMC directive
Benannte
Stelle
Notified body
DVGW Cert GmbH
0085
CE-Zertifikat vom
CE certificate from
Gültig bis
Valid until
19.02.2018
19.02.2028
CE-0085BP0001
Baumusterprüfbescheinigung
Type examination certificate
Prüfgrundlagen
EU/2016/426 A III B (09.03.2016)
Test basis
EN 298:2012
Ausgestellt durch BST Solutions GmbH
Issued by
Rechtsverbindliche
Unterschrift
Legally binding signature
Name Funktion Ort, Datum
Function Place, Date
Eberhard Röllecke Geschäftsführer Heiligenhaus, den 29.03.2021
General Manager

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 8
2 | Safety
2.1 Intended use
The flame detector provides the burner control with the safety-related, switched ionization
current simulation.
The KLC 20 / KLC 21 is approved for intermittent operation. When a voltage is applied, it per-
forms a self-test. The flame detector must restart at least once every 24 hours.
The manufacturer/supplier shall not be liable for damage resulting from use for non-inten-
ded purposes. The user/operating company alone shall bear the risk.
Do not allow any persons who are being apprenticed, educated, instructed or on a general
training programme to work on the device without the constant supervision of an experien-
ced person.
Persons who are under the influence of drugs, alcohol or medication that affects reactivity
shall not be permitted to carry out work on the device.
Connection, set-up, maintenance and repair work may only be carried out by qualified spe-
cialist staff.
This device may cause hazards if it is operated inappropriately by untrained staff or if it is not
used for its intended purpose.
Generally valid legal and other binding regulations on accident prevention and environmental
protection in addition to basic health and safety requirements have to be observed. The op-
erating company has to instruct its staff accordingly.
2.2 Requirements on persons
SAFETY
Danger when improperly used! The device may cause hazards if it is not used as in-
tended and/or for any other purposes. The device has to be used only for the purpo-
ses for which it is intended. The procedures described in the operating manual have
to be observed.
DANGER
!
Work on/with the device may only be performed by persons authorized to do so based
on their training and qualification. Furthermore, such persons have to have been com-
missioned by the operating company.
NOTICE

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 9
2.3 Safety instructions
Before working at the flame detector switch off the power supply. Before first commissioning
or replacement of the device check external wiring!
The following instructions on accident prevention have to be observed when operating the
flame detector:
2.4 Safety devices
2.4.1 Fundamental aspects
Check the safety equipment and locking devices on the device for safe operational condition.
Only operate the device if all safety devices are present and enabled. The operating company
or operator of the flame detektor is responsible for the proper operation of the device.
SAFETY
Only operate the device if it is in a proper state.
• Do not remove or disable safety devices.
• Check for externally noticeable damage and defects prior to using the device. Imme-
diately notify the appropriate authority/person of any changes that occur (including
changes in operating performance). If necessary, stop and secure the device imme-
diately.
• Allow only authorised specialist staff to carry out set-up and/or maintenance work.
• Replace worn or defective parts.
• Use suitable maintenance tools only.
• After repair work, refit all safety devices and carry out electrical and mechanical
checks.
• Check the operating manual for details of displays as well as switch-on and switch-
off procedures.
• Prior to switching on the device, make sure that no-one can be endangered by the
device.
• The operating manual always have to be kept close to the device and be readily at
hand.
• Any non-compliance with the safety instructions outlined in this operating manual
may lead to damage to property, personal injury or even death.
The device has been fitted with warning and danger signs for the protection of ope-
rating staff. These signs have to be observed. Damaged or illegible signs have to be
replaced immediately.
NOTICE
NOTICE

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 10
2.4.2 Safety devices on the flame detektor
The flame detektor has been fitted with the following safety devices:
• Housing (protection against accidental contact)
• Selftest function at power up
2.5 Safety instructions in case of maintenance and troubleshooting
2.5.1 Fundamental aspects
• Deadlines set or indicated in the operating manual for repetitive checks / inspections shall
have to be observed!
• Appropriate workshop equipment is essential for performing maintenance work.
• In conformance with the electrical regulations, work on the electrical equipment of the
system may only be carried out by an electrical specialist or by trained staff under the di-
rection and supervision of an electrical specialist.
• The adjustment, maintenance and inspection activities and deadlines stipulated by BST
Solutions, including information on the replacement of parts / assemblies, have to be ob-
served! These tasks may only be carried out by authorised specialist staff.
• Operating staff have to be informed before maintenance or other special work is carried
out. A supervisor has to be appointed.
• Screw connections which have been loosened during maintenance and servicing work, have
to be tightened.
• If maintenance and repairs require safety devices to be dismantled, these devices have to
be remounted and checked as soon as the maintenance and repair work has been com-
pleted.
• Ensure safe and environmentally friendly disposal of replacement parts!
• Spare parts supplied by BST Solutions or approved of by BST Solutions only may be used.
SAFETY
Due to the safety function of the disturbance frequency fading out (optional), a simula-
tion of the flame by means of a simple artificial light source is not possible. If a flame
simulation is required, e.g. for final testing of the burner without a real flame, a light
source with a constantly changing frequency between 60 and 150 Hz or the flame si-
mulation unit TG10 must be used.
NOTICE

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 11
2.5.2 Electrical / electronic devices
2.5.3 Inspection in accordance with the Ordinance on Industrial Safety and Health
In the event of the combination or installation of units from different manufacturers or sup-
pliers, a precise test must be carried out by the operator before commissioning in accordan-
ce with the applicable industrial safety regulations and the applicable electrical engineering
rules.
In case of queries, please get in touch with BST Solutions.
2.5.4 Safety test
SAFETY
Danger to life caused by electrical current!
Contact with live wires or components presents a danger to life!
Prior to any work on the electrical equipment, disconnect the flame detector from the
power supply network!
DANGER
!
In keeping with the electrical regulations, work on electrical / electronic parts / com-
ponents may only be carried out by electrical specialists.
NOTICE
To ensure proper operation, the flame detector must be tested several times in all
applications by starting and stopping the burner several times. The flame relay must
switch off reliably in all cases when there is no flame. This test should be carried out
in different operating situations (see technical data sheet). This is an indispensable
prerequisite for safe and proper operation of the unit!
WARNING
!
Important rules of conduct
• Check the device in regular intervals. Any defects or faults ascertained have to be corrected
immediately. Switch off the device until the defects have been corrected.
• Equipment parts undergoing inspection, maintenance or repair work have to be made de-
energised, if required. First check that the disconnected parts are no longer live, then short
to earth (ground). Also isolate neighbouring live parts!
• If work is required on live parts, a second person has to be assigned who can disconnect
the power supply in case of an emergency. Only use insulated tools!
• Fuses must not be repaired or bridged. Only use original fuses with the specified current!

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 12
TECHNICAL DATA
Optical features
VIS/IR
350 to 1100 nm , max. sensitivity at 920 nm
Selftest function Fully electronical at power up
Selftest time < 2 s
Switch-on time Typically 0.5 s
Switch-off time < 0,6 s
Flicker range 15 – 400 Hz
Switch-on frequency 25 Hz, other frequencies on request
Switch-off frequency 15 Hz, other frequencies on request
Accepted flame signal loss duration ca. 280 ms
Output
max. switching current
max. switching power
max. switching voltage
15 mA
0.3 W
280 V AC/400 V DC
Input 230/240 V AC 50/60 Hz
120 V AC (optional)
24 V AC/DC (optional)
Consumption max. 6 mA
Operating temperature
KLC 20
KLC 21
-20 to +60°C
-20 to +75°C
Humidity max. 95% r.H., non-condensing
Connection Plug connector
Kind of protection IP 41
Operating position any position
Protection class II
Cable length 1 m (other length on request)
3 | Technical data
3.1 General characteristic features
• Selftest function after power up
• Intermittent operation
• UV/VIS/IR-Sensor
• Fully electronic construction
• Spectral analyzing process
• CE approved CE0085PB0001
3.2 Electrical system, optical system, mechanical system

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 13
TECHNICAL DATA
3.3 Weight
Weight approx. 0.029 kg
3.4 Dimensions
Length ( with plug ) 115 mm
Width 30 mm
Height 22 mm
Dimensional drawing see under point 4.4
3.5 Block diagram KLC 20/KLC 21

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 14
TRANSPORT, INSTALLATION AND CONNECTION
4 | Transport, installation
and connection
4.1 Scope of delivery
• Flame detector KLC 20 / KLC 21
• Operating manual (optional, customer-dependent)
• Connection cable (optional)
• Mounting flange (optional)
• Angle adapter KLC(optional)
• Adapter ADP (optional)
• Diagnostic tool KLCcom (optional)
• Flame simulation device TG10 (optional)
Refer to the order papers for the exact scope of delivery and compare with the delivery note.
Checking for completeness
Check the entire delivery for completeness against the accompanying delivery note. Please
refer to our terms of sale and delivery otherwise.
Report any damage
After arrival of the device and accessories, notify the shipping agent, the insurance company
and BST Solutions immediately in case of any damage caused by transport or inadequate
packaging.
Take steps to minimise and prevent further damage.
Report the insurance case to the insurance company without delay and transmit the full
claim documents at once in order to expedite the claims settlement (at the latest in suf-
ficient time before the expiry of any periods of preclusion and/or limitation relating to the
compensation claims against third parties).
All installation and connection work may be carried out by qualified and approved spe-
cialist staff only!
Observe the legal stipulations and adjustment instructions of the plant operator!
NOTICE

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 15
TRANSPORT, INSTALLATION AND CONNECTION
4.2 Packaging
The flame detektor is shipped in different packaging materials.
The most frequently used packaging materials are cardboard and plastics (foils, foamed material).
4.3 Shipping instructions
4.4 Dimensions
see the following illustration:
Packaging has to be disposed of in an environmentally friendly way and in accordance
with the relevant provisions on disposal.
Do not subject the appliance to heavy impacts during transport. Do not subject the
appliance to any humidity!
NOTICE
NOTICE
115
30
22
13.5
55
50

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 16
TRANSPORT, INSTALLATION AND CONNECTION
4.5 Installation
All installation and connection work may be carried out by qualified and approved
specialist staff only! The legal regulations as well as adjustment instructions of the
plant operator have to be observed!
NOTICE
The KLC 20 / KLC 21 should be mounted close to the flame with straight alignment. The compact
flame detector should be mounted with the mounting flange KLC or another suitable holder with
Ø14 mm opening. The radial adjustment to the flame is realised with the viewing angle adapter KLC
and replaces the mounting flange KLC. Fix the detector with the holder. The best flame signal will
be achieved from strong flickering parts of the flame radiation. The angle of view, especially with
sight tubes, must be of appropriate dimensions to avoid any reduction of flame radiation. Protect
the sensor against other light sources.
To prevent faults, the direct view of an ignition spark must be avoided. Faults in the prepurge phase
can be caused by this. The maximum cable length of the connection cable must be observed. The
connection cable must be kept separate from high-energy ignition and mains cables and must not
be laid parallel to them over long distances.
Attention: For safety reasons and technical regulations a controlled burner shut down of at least
once per 24 hours must be guaranteed.
For the mounting BST Solutions offers different accessories:
4.5.1 Mounting flange KLC
The mounting flange KLC serves for to the admission, attachment and adjustment of the flame
detector. Two overall heights with 7 and 13 mm are available. By means of an O-ring the mounting
flange KLC can be simply sealed to the burner housing.

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 17
TRANSPORT, INSTALLATION AND CONNECTION
4.5.2 Viewing angle adapter KLC for radial adjustment
With the optionally available angle adapter, the radial alignment of the KLC 20 / KLC 21 to the fla-
me axis is carried out by means of an optimally shaped mirror surface. The angle adapter simul-
taneously replaces the KLC holder. A separate flame detector type is therefore not required. With
maintenance work the reflector surface should be protected from possible contamination and if
necessary it is to clean with a clean, soft and lint free cloth.
4.5.3 Adapter ADP
The ADP adapter makes it possible to mount the flame detectors KLC 20 / KLC 21 with additional
axial alignment directly on a combustion chamber opening. A quartz glass serves as a pressure
barrier and prevents the escape of heating gases from the combustion chamber. For the applica-
tion of the flame detector KLC at high surface temperatures, the version made of heat-insulating
material should be used.
26
19
48
35
7.5
4.5
69 7
all dimensions in mm

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 18
TRANSPORT, INSTALLATION AND CONNECTION
4.6 Connection
4.6.1 Electrical connection
4.6.2 Connector diagram
Control boxes from Dungs / Satronic
Ask for connector details of other burner control boxes.
4.7 Storage
Do not unpack packed flame detector and accessories.
The following regulations apply to storage:
• Store in a dry place. Maximum relative humidity: 95 % r. h., non-condensing.
• Ensure that the packages are not stored outdoors.
• In addition, ensure that the floor of the storage room is dry during storage.
• Protect from direct sunlight. Storage temperature -20 to +60 °C
• Store dust-free
• Avoid mechanical shocks and damage.
Danger to life caused by electrical current!
When connecting, observe the safety instructions and the locally applicable safety
regulations!
DANGER
!
Type of control box
Wire colour
MPA22 TF 8 DKO 9.. DKW 9..
DMO 9..
TMO
720-4
Blue terminal no.: 12 – 5 N 2 2 2
Black terminal no.: 12 – 3 Ion 1 1 1
Brown terminal no.: 6 – 17 L1 9 9 9
LED
Refer to the Technical Data chapter and the following wiring diagram for connection data.
Check that the mains voltage corresponds to the voltage indicated on the type plate.
Before connecting, check the device and the connecting cables for visible damage.

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 19
DESCRIPTION
5 | Description
5.1 Functional description
The flame detector KLC 20 / KLC 21 is a compact flame detector specially developed for blue-
burning combustion systems in forced draft burner applications in the household sector. The
patented evaluation of the signal is carried out via the flicker frequency of the radiation of the
upcoming flame. A processor enables the evaluation and conversion of the flame signal to a
digital signal in the value required for the flame signal amplifier of the corresponding firing
system. No adjustments are necessary during commissioning or maintenance.
The KLC 20 / KLC 21 only evaluates the flickering of the flame to be monitored. A device ver-
sion with interference frequency suppression is available as an option.
In this case, uniform light radiation and any constant frequencies do not lead to permanent
flame detection. Interfering sources of extraneous light, e.g. from fluorescent tubes or low-
frequency background radiation from glowing brickwork, are blanked out. Unintentional in-
fluences on the flame detection can thus be avoided.
Via the LED display as an optical interface, it is possible to read out various relevant ope-
rating parameters (e.g. monitoring of the flame signal, serial number). The flame detector
provides the burner control unit with the safety-related binary signals for „flame ON/OFF“.
The KLC 20 / KLC 21 activates its self-test function during power up. Therefor the flame de-
tector is approved for intermittend operation. For safety reasons and technical regulations a
controlled burner shut down at least once per 24 h must be guaranteed.
5.2 Disturbing frequency cut off (optional)
The KLC is optionally aviable with the “disturbing frequency cut off – function”. Here the
KLC20 / KLC21 detects only real flames, which are characterized by unsteady changing fre-
quencies. DC lights and any kind of constant frequencies, e.g. form fluorescent tubes or
other electrical lamps, will be blanked out and will not lead to a constant flame de-tection.
After the sensor is admitted with constant frequencies of a light source, this function will
enable at first the switching output, but after approximatly 5 up to 9 seconds the output
will be disconnected again. Therefore it is to paid attention during a inspection of the flame
detector KLC20 / KLC21, that this performance is intended and describes not a malfunction.
5.3 Optionally function blocks for KLC
5.3.1 Relay module for flame detectors RMF 1
The flame detector KLC20/KLC21 is a low power signal output equipped to simulate ionizati-
ontion or LDR signal. If a relay switch contact is required, the use of RMF 1 is recommended.
The RMF 1 has an electrically isolated changeover contact with a maximum switching voltage
of 250 V AC, a maximum switching current of 1 A and a maximum rating of 250 VA. More in-
formation can be found in the operating manual of the RMF1 in its current version.
This option is mandatory for use in gas applications!
NOTICE

BST Solutions GmbH | FLAME DETECTOR KLC 20 / KLC 21 Page 20
OPERATION OF THE FLAME DETEKTOR
6 | Operation of the flame detektor
6.1 Test of the flame detektor
To ensure the proper operation, the flame detector has to be testet several times by starting
and stopping the burner. As long as there is no flame in all cases the flame relays has to be
switched off solid.The test should be repeat for differnt operation situations (see also data
sheet). This is a essential condition for a safe and proper operation.
6.2 Operating indicator LED
Via the built-in LED the flame detector KLC 20 / KLC 21 is indicating the following operating
conditions:
6.3 Diagnostic with KLC-Com
With the data interface KLC-Com, consisting of optical adapter with cable, USB-Interface and
software BST-Com, the following information can be read from the KLC20 / KLC21:
• Impulses
• Serial Number
• Version / Edition
• present flicker frequency
For this purpose, the USB-optoadapter KLC-Com must be inserted into the recess of the
LED. Via the connection cable and the interface, the data can be read into a laptop or PC
using the corresponding BST-Com software. Further information can be found in the BST-
Com operating instructions.
LED Meaning
off KLC is not active or without potential
blinking Selftest finished, KLC is active, no flame detected.
on Selftest finished, KLC is active, flame detected.