Siemens LMG21.350A27 User Manual

Landis & Staefa Division CC1N7421E December 04, 1998 1/16
7
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Burner Controls LMG2...
Burner controls for the supervision of single- or two-stage forced draught gas or
gas / oil burners of small to medium capacity (typically up to 350 kW) in
intermittent operation.
The burner controls are certified to EN 230 and EN 298.
They carry the CE mark based on the directives for gas appliances and
electromagnetic compatibility.
The LMG2... and this data sheet are intended for use by OEMs which integrate the
burner controls in their products.
Burner controls of the LMG2... range are used for startup and supervision of single- or
two-stage gas or gas / oil burners in intermittent operation.
The flame is supervised with a detector electrode or UV flame detector QRA... (with
ancillary unit AGQ2...A27).
LMG21... / LMG22... in the same housing replace burner controls LGB21... / LGB22...
(refer to «Type summary») and, with the help of the respective adapters, burner controls
LFI7... and LFM1... (refer to «Ordering»).
Application-specific features
–
Detection of undervoltages
–
Air pressure supervision with function check of air pressure monitor during startup
and operation
–
Electric remote reset
–
Indication of error code and flame signal by means of LEDs in the lockout reset button
–
Precise program times thanks to digital processing of signals
Available versions
•
LMG21... / LMG22... For unlimited burner capacities (output on startup ≤ 120 kW)
Locking in the event of loss of flame during operation
•
LMG25... For burner capacities ≤ 120 kW
Three repetitions in the event of loss of flame during
operation
ISO 9001
Use

Siemens LMG21.350A27 Specifications

General

Brand	Siemens
Model	LMG21.350A27
Category	Controller
Language	English

Summary

Burner Controls Overview

Product Description and Use

Describes the application and intended use of the LMG2... burner controls for various burner types.

Key Features and Versions

Highlights application-specific features and lists available LMG2... burner control versions.

Safety and Installation Guidelines

General Warning Notes

Provides essential warnings to prevent personal injury, property damage, or environmental harm.

Engineering, Mounting, and Installation Details

Covers engineering, mounting, and detailed installation notes for safe and correct operation.

Wiring Example

Illustrates a connection diagram example for understanding wiring configurations.

Detector Connection and Physical Design

Electrical Connection for Detectors

Explains the requirements for loss-free signal transmission from ionization and UV detectors.

Mechanical Design and Plug-in Base

Details the mechanical construction of the burner control and its plug-in base.

Product Type Summary

Type Reference and Parameter Table

Summarizes different burner control types with their parameters for selection.

Ordering and Accessories

Ordering Components and Adapters

Lists components for ordering, including burner controls, detectors, bases, and adapters.

Technical Specifications

LMG2... Technical Data

Provides detailed technical specifications, environmental conditions, and terminal ratings.

Flame Supervision Principles

Detector Electrode Supervision

Explains flame supervision using detector electrodes and measuring principles.

Measuring Circuit Diagram

Illustrates the measuring circuit for detector currents with relevant components.

UV Detector Supervision

UV Detector Integration and Operation

Details flame supervision with UV detectors and the ancillary unit AGQ2...A27.

UV Detector Measurement Circuits

Shows connection and measurement circuits for UV detectors and ancillary units.

Operational Functions and Logic

Startup Prerequisites and Operation Modes

Outlines prerequisites for startup, operational states, and undervoltage handling.

Fault Response and Reset Procedures

Explains control program behavior during faults and how to reset the unit.

Connection Diagrams LMG21/LMG25

LMG21/LMG25 Wiring and Application Examples

Provides wiring diagrams and application examples for LMG21 and LMG25 burner controls.

Connection Diagrams LMG22

LMG22 Wiring and Application Examples

Provides wiring diagrams and application examples for LMG22 burner controls.

Application Examples and Legend

Additional Application Scenarios

Illustrates other application examples, such as burners without fan assistance.

Diagram Legend and Symbols

Defines abbreviations and symbols used in the connection diagrams.

Fault Diagnosis and Error Codes

Operating Status and Fault Indicators

Explains the operating concept, LED indicators, and fault diagnosis steps.

Error Code Table for Fault Identification

Lists blink codes and their corresponding potential causes for fault identification.

Flame Establishment Time Diagnostics

Measuring and Interpreting Flame Time

Details how to measure and read the flame establishment time using blink codes.

Internal Circuit Diagrams

LMG21/LMG25 Internal Circuitry

Presents the internal schematic diagram for LMG21 and LMG25 burner controls.

LMG22 Internal Circuitry

Presents the internal schematic diagram for LMG22 burner controls.

Physical Dimensions

Unit and Plug-in Base Dimensions

Provides detailed physical dimensions for the burner control unit and plug-in base.

Ancillary Unit Dimensions

Shows the dimensions for the ancillary unit AGQ2...A27.