Table of Contents
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Use
CC1N7451en
20.11.2017
Burner Controls
Burner controls
For gas, oil or dual-fuel forced draft burners of medium to high capacity
For multistage or modulating burners in intermittent operation
With checked air damper control
– with UV detectors QRA2 / QRA4 / QRA10
– and ionization probe
The LFL1... and this Data Sheet are intended for use by OEMs which integrate the
burner controls in their products!
Control and supervision of forced draft burners of direct spark flame or interrupted
pilot construction
For medium to high capacity
For intermittent operation (at least one controlled shutdown every 24 hours)
For universal use with multistage or modulating burners
For use with stationary air heaters (WLE)
For use with dual-fuel burners
Type-tested and approved in accordance with DIN EN 298
The flame supervision is ensured via a flame detector QRA2 / QRA4 / QRA10 or
ionization probe. The difference between 01 series and 02 series is the duration of the
safety time for the pilot burner of burners equipped with pilot gas valves.
For atmospheric burners of high capacity, use the LFL1.638.
Building Technologies Division
7
451
LFL1...
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Table of Contents
Related Manuals for Siemens LFL1.635
Summarization of Contents
Burner Controls Overview
Application Scope
Defines the intended applications, burner types, and operational modes for the LFL1... burner controls.
Intended Use and Target Audience
Specifies that the LFL1... is for OEMs integrating controls into their products.
Safety and Documentation
General Safety Warnings
Lists critical safety precautions for handling, installation, and operation to prevent injury and damage.
Mounting and Installation Guidelines
Covers proper mounting procedures and electrical installation requirements for safe operation.
Operational Guidance
Flame Detector Connection Requirements
Details how to connect flame detectors for reliable signal transmission and avoid interference.
Commissioning Safety Checks
Outlines essential safety checks to perform during plant commissioning or maintenance.
Engineering and Wiring Notes
Electrical Installation Principles
Provides guidance on wiring, component connection, and compliance with regulations for safe integration.
Standards and Certifications
Regulatory Compliance and Standards
Lists applicable directives and harmonized standards for burner controls, ensuring safety and performance.
Product Lifecycle and Design
Designed Lifetime and Replacement
Explains the expected operational lifespan and when the burner control should be replaced.
Mechanical Design Features
Describes the physical attributes and construction of the burner control housing and its components.
Product Variants and Timing
LFL1... Type Summary Table
Presents a summary of LFL1... types and their corresponding switching times for different applications.
Available Accessories
Flame Detector and Connection Accessories
Lists compatible flame detectors and accessories for connecting burner controls.
Technical Data - General and Environmental
General Unit Specifications
Details electrical, physical, and safety specifications for the LFL1... burner control unit.
Environmental Operating Conditions
Specifies the permissible climatic and mechanical conditions for storage, transport, and operation.
Technical Data - Flame Supervision
Flame Supervision Specifications
Provides technical data related to flame supervision methods, currents, and cable lengths.
Detector Current Measurement Circuits
Illustrates the measurement circuits for ionization probes and UV flame detectors.
Functionality Overview
Burner Operation Modes
Describes the operational sequences for 2-stage direct spark, modulating direct spark, and 2-stage interrupted pilot burners.
Detailed Functionality and Safety Features
Burner Control and Flame Supervision
Explains advanced safety features, burner control logic, and flame supervision mechanisms.
Startup Preconditions
Lists the necessary input signals and conditions required before the burner control can initiate a startup sequence.
Startup Sequence Details
Startup Sequence Steps
Details the initial steps of the burner startup sequence, including prepurge and interval timings.
Direct Spark Flame Burner Sequence
Outlines the specific timing and safety checks for direct spark flame burner startup phases.
Interrupted Pilot Burner Startup
Interrupted Pilot Burner Timings
Describes the timing parameters and safety times specific to interrupted pilot burner startup sequences.
Burner Operation and Shutdown
Explains burner operation, controlled shutdown procedures, postpurge, and afterburn times.
Fault Conditions and Lockout
Fault Indication and Lockout Types
Explains the meaning of lockout symbols and the different fault conditions that trigger lockout.
Lockout Indicator and Reset Procedures
Describes the lockout indicator's function and the correct procedure for resetting the burner control after a fault.
Connection Examples and Program Sequences
Direct Spark Flame Burner Connections
Provides specific connection examples and program sequences for various direct spark flame burner configurations.
Program Sequences for Flame Control
Modulating and Interrupted Pilot Burner Sequences
Illustrates program sequences for modulating and interrupted pilot burner types, including air damper control.
Document Legend and Symbols
Key to Symbols and Signals
Defines the meaning of various symbols, abbreviations, and control signals used throughout the document.
Legend and Timing Tables
Lockout Indications and Time Table
Explains lockout indicators and provides a detailed table of all timing parameters used in the sequences.
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