Siemens LMG25.330A27 User Manual

Landis & Staefa Division CC1N7421E December 04, 1998 1/16
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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 LMG25.330A27 Specifications

General

Mounting position	Any
Type	Controller
Gas type	Natural gas, LPG
Voltage	24 V DC
Frequency	50-60 Hz
Current consumption	Approx. 100 mA
Operating temperature range	-20 to +60 °C

Summary

Safety and Installation Guidelines

Warning notes

Critical safety instructions to prevent injury, damage, or environmental impact.

Engineering and Mounting Notes

Installation notes

Procedures for qualified staff, cable routing, and connection checks.

Product Variants and Configuration

Type summary

Ordering and Accessories

Ordering components

Lists available burner controls, flame detectors, bases, and accessories for ordering.

Technical Data

Specifications and ratings

Provides operating voltage, frequency, weight, environmental conditions, and terminal ratings.

Flame Supervision Principle

Detector electrode supervision

Explains the principle of flame supervision using conductivity and rectification.

UV Detector Integration

AGQ2...A27 and UV detector QRA...

Functions and Operational States

Startup Prerequisites and Operational Conditions

Control Program in Event of Fault

Outlines actions taken upon various fault conditions, leading to lockout.

Resetting the Burner Control

Connection Diagrams and Examples

LMG21/LMG25 connection and application examples

LMG22 Connection Diagrams and Examples

LMG22 connection and application examples

Fault Diagnosis and Operating States

Diagnosis of fault causes

Guides on reading fault codes from LEDs to identify issues.

Error code table

Lists blink codes and their corresponding possible fault causes.

Flame Establishment Time Measurement

Interrogation and diagnostics