Siemens LAL1.25 User Manual

CC1N7153en
21.09.2016
Building Technologies Division
7
153
Oil Burner Controls
LAL...
Oil burner controls
 For oil atomizing burners of medium to large capacity
 For multistage or modulating burners in intermittent operation
 With or without air pressure supervision for checked air damper control
 Flame supervision
– with photoresistive detector QRB
– or blue-flame detector QRC1
– or silicon photocell detector RAR9
 Suitable for use with air heaters (WLE)
The LAL and this Data Sheet are intended for OEMs which integrate the oil
burner controls in their products!
Use
 For the control and supervision of oil atomization burners
 For burners of medium to high capacity
 For intermittent operation (at least one controlled shutdown every 24 hours)
 Can be universally used with multistage or modulating burners
 Suited for use with stationary air heaters (WLE)
The flame supervision is ensured via a Photoresistive detectors QRB，blue-flame
detectors QRC1 or Silicon photocell detectors RAR9.
LAL1 - Yellow- and blue-flame burners without air pressure supervision
LAL2 - Yellow-flame burners with air pressure supervision
LAL3.25 - For special applications, e.g. burners of incinerator plant
(for details, refer to «Type summary» and «Notes»)

Siemens LAL1.25 Specifications

General

Series	LAL
Model	LAL1.25
Manufacturer	Siemens
Frequency	50-60 Hz
Flame detector	QRA, QRC
Application	Burner control for oil and gas burners
Supply voltage	220-240 V

Summary

Oil Burner Controls Overview

Product Description and Features

Safety and Installation Guidelines

Critical Warning Notes

Essential safety instructions for preventing hazards and ensuring safe operation.

Mounting and Installation Procedures

Electrical and Engineering Aspects

Type Summary and Specifications

LAL Model Variants

General Technical Data

Unit Specifications and Ratings

Key technical data including voltage, frequency, power, and current ratings.

Technical Data - Flame Supervision

Flame Supervision Parameters

Details minimum detector current, maximum permissible current, and instrument connection points for flame supervision.

Detector Cable Length Requirements

Functionality and Safety Features

Burner Operation Modes

Explains the operational sequences for 2-stage and modulating flame burners.

Key Safety Mechanisms

Highlights the built-in safety features ensuring reliable and secure burner control.

Burner Startup Sequence

Initial Startup Phases

Covers the start command, prepurge, and preignition stages of the burner startup.

Ignition and Damper Control

Details ignition safety, postignition, and air damper positioning during startup.

Fault Conditions and Lockout Management

Lockout Indication and Fault Types

Explains symbols for fault indications and common lockout causes.

Lockout Reset Procedure

Describes the correct steps to reset the burner control after a lockout event.

Connection Diagrams - LAL1

LAL1 Wiring Configuration

Connection Diagrams - LAL2/LAL3

LAL2/LAL3 Wiring Configuration

Sequence Diagram Analysis

Control Output Timing and States

Document Legend and Symbols

Component and Signal Definitions