Datasheet Content
7 782
Flame safeguard LFS1...
Flame safeguard with approval for continuous operation for the supervision of oil
flames and gas flames in applications with an ionization probe and a photocell
detector RAR9.
Flame safeguard for intermittent operating mode with UV flame detectors QRA2 /
QRA2M / QRA4 / QRA4M / QRA10 / QRA10M.
LFS1 and this Data Sheet are intended for OEMs using the LFS1 in or on their
products.
Use, features
Use LFS1 units are designed for the supervision of oil burners and gas burners in
combination with control unit LEC1, burner control LME39.xxxRP, or with
programmable logic controllers.
Typical fields of application range from industrial burners up to the highest security level
SIL3 and in the field of ship burners.
Flame supervision:
- Takes place with photocell detector RAR9 with approval for continuous operation,
in the case of LFS1.1 (firing on oil).
- Takes place with an ionization probe with approval for continuous operation or with
UV flame detector QRA2 / QRA2M / QRA4 / QRA4M / QRA10 / QRA10M in
intermittent operation, in the case of LFS1.2 (firing on gas).
Building Technologies
CC1N7782en
18.04.2018
Use, features
The flame detectors are used in conjunction with control unit LEC1 or with freely
programmable controllers in the following applications:
- Dual supervision of burners / supervision of the main flame or of the ignition and
main flame by 2 flame safeguards with the same or different flame detectors
- Multiflame supervision / plants with several burners whose flames must be
supervised individually by one or several flame detectors, but whose startup and
supervision is carried out centrally and simultaneously by only one control unit
- The flame safeguards are also used as flame indication units in combustion
plants with manual startup
Features - Flame signal display via multicolor LED signal lamp
- Flame signal display via DC 0...10 V output signal (display only)
- Can be parameterized via BCI communication interface
- Potential-free signal contacts with double insulation
- Undervoltage detection
Supplementary documentation
ASN Title Documentation Document type
number
LEC1 Control unit CC1N7761 Data Sheet
Connection accessories for small
AGK11.7 CC1N7201 Data Sheet
burner controls
AZL21 / AZL23 Display and operating units CC1N7542 Data Sheet
LFS1 Flame safeguard CC1A7782 User documentation
PC software for microprocessor
Installation and Operating
ACS410 controlled burner controls and CC1J7352
Instructions
flame safeguards
BCI interface between flame
OCI410 CC1N7616 Data Sheet
safeguard and PC
QRA4 / QRA4M UV flame detector CC1N7711 Data Sheet
QRA2 / QRA2M
UV flame detector CC1N7712 Data Sheet
QRA10 / QRA10M
RAR9 Photocell detector CC1N7713 Data Sheet
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Building Technologies CC1N7782en
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Warning notes
To avoid personal injury or damage to property or the environment, the following
warning notes must be observed.
Do not open, interfere with, or modify the unit.
∂ All activities (mounting, installation, service, etc.) must be performed by qualified
staff.
∂ Before making any wiring changes in the connection area, completely isolate the
plant from mains supply (all-polar disconnection). Ensure that the plant cannot be
inadvertently switched on again and that it is indeed dead. If this is not observed,
there is a risk of electric shock
∂ Take suitable measures to provide protection against accidental contact at the
electrical connections. If this is not observed, there is a risk of electric shock
∂ Press the lockout reset button / operation button of the LFS1 or the AGK20 lockout
reset button extension only manually (applying a force of ′10 N) without using any
tools or pointed objects. If this is not observed, there is a risk of loss of safety
functions and a risk of electric shock
∂ Units must not be put into operation after a fall or shock, as this can adversely affect
the safety functions even if the units do not exhibit any external signs of damage. If
this is not observed, there is a risk of loss of safety functions and a risk of electric
shock
∂ Each time work has been carried out (mounting, installation, service, etc.), check
that the wiring is correct. If this is not observed, there is a risk of loss of safety
functions and a risk of electric shock
∂ The mains-powered ionization probe does not offer protection against electric shock
hazards. Protection against accidental contact must be ensured. If this is not
observed, there is a risk of electric shock
∂ An ignited UV tube is a source of UV radiation.
If the flame is supervised by optical flame detectors, both detectors must be placed
in a way that ensures there is no direct visual contact between them. If this is not
observed, there is a risk of loss of safety functions
∂ Connection of UV flame detectors QRA2M and QRA10M is only permitted if
additional module AGK30 is used. Additional module AGK30 must always be
connected within plug-in base AGK11.7 in terminal areas 1…7. If this is not
observed, there is a risk of loss of safety functions and a risk of electric shock
∂ The data line for the AZL2 or other accessories, such as the OCI410 (plugs into the
BCI interface), must only be connected or disconnected when the unit is dead (all-
polar disconnection), since the BCI interface does not ensure safe separation from
the mains voltage. If this is not observed, there is a risk of electric shock
∂ Intermittent operation: For safety reasons – self-test of the flame supervision circuit,
etc. – at least one controlled shutdown must take place every 24 hours for
applications with LFS1.2... and UV flame detectors QRA2 / QRA2M / QRA4 /
QRA4M / QRA10 / QRA10M. If this is not observed, there is a risk of loss of safety
functions
∂ The separating element supplied can be installed in the area between connection
terminals 9, 10, 11, and 12, and the other terminals (1...7) as a means of achieving
double insulation; refer to the Installation notes chapter. It is particularly important
that the wiring is handled and installed correctly and as specified in the area around
the terminals. If this is not observed, there is a risk of loss of safety functions and a
risk of electric shock
∂ The 0...10 V voltage output terminal 7 is not double-insulated from the mains
voltage. It is important to bear this in mind when selecting measuring equipment (at
least CAT III). If this is not observed, there is a risk of electric shock
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Building Technologies CC1N7782en
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Standards and certificates
Only in conjunction with Applied directives:
the flame detectors ∂ Low Voltage Directive 2014/35/EU
∂ Pressure Equipment Directive 2014/68/EC
∂ Gas Appliances Regulation (EU) (EU) 2016/426
∂ Electromagnetic Compatibility EMC (immunity) *) 2014/30/EU
*) The compliance with EMC emission requirements must be checked after the flame safeguard is
installed in equipment
Compliance with the regulations of the applied directives is verified by the adherence to
the following standards / regulations:
∂ Automatic burner control systems for burners and DIN EN 298
appliances burning gaseous or liquid fuels
∂ Safety and control devices for burners and appliances DIN EN 13611
burning gaseous and/or liquid fuels — General
requirements
∂ Automatic electrical controls for household and similar use DIN EN 60730-2-5
Part 2-5:
Particular requirements for automatic electrical burner
control systems
The edition of the standards that applies in each case can be found in the
declaration of conformity.
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