Siemens LFL1.335 User Manual

CC1N7451en
20.11.2017
Building Technologies Division
7
451
Burner Controls LFL1...
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
 Flame supervision
– 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!
Use
 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.

Siemens LFL1.335 Specifications

General

Type	LFL1.335
Protection class	IP40
Mounting	Base mounting
Connection type	Screw terminals
Standards	EN 298
Application	Oil or gas burners
Voltage	220...240 V
Frequency	50...60 Hz
Number of poles	1
Rated operational voltage	230 V

Summary

Siemens LFL1 Burner Controls Overview

Burner Controls Features

Safety and Installation Guidelines

Essential Warning Notes

Crucial safety precautions for installation, operation, and maintenance to prevent injury and damage.

Mounting and Installation Notes

Explains proper mounting procedures and electrical installation requirements for safety.

Operational and Technical Setup

Electrical Connection of Flame Detectors

Commissioning Safety Checks

Lists essential safety checks to perform during plant commissioning for proper operation.

Technical Specifications

LFL1 General Unit Data

Flame Supervision Technical Parameters

Details technical parameters for ionization and UV flame supervision, including cable lengths and currents.

Burner Control Functionality

Functionality of Burner Controls

Burner Startup Sequence

Describes the step-by-step process of burner startup, including prepurge and ignition phases.

Fault Conditions and Lockout Indication

Details fault types, lockout causes, and the meaning of lockout indicator symbols.

Wiring and Program Sequences

Connection Diagrams for LFL1

Connection Examples and Program Sequences