Siemens LGA63.191A27 User Manual

CC1N7418en
21.06.2016
Building Technologies Division
7
418
Gas Burner Controls
LGA...
The gas burner controls are used for supervision, startup and control of
atmospheric gas burners of small to medium capacity without a fan in
intermittent operation.
The LGA... and this Data Sheet are intended for use by OEMs which integrate the
gas burner controls in their products.
Use, features
The LGA are designed for startup and supervision of atmospheric gas burners in
intermittent operation. The flame is supervised with an ionization probe.
 Burner controls for gas burners and gas units with or without fan
to EN 298: 1994-02 or EN 298: 1993
 Undervoltage detection
 Air pressure supervision with functional check of the air pressure switch during
startup and operation
LGA41.173A27 and LGA52.171B27 are suitable for use with air heaters.

Note!
Do not use for new designs.

Note!
The following burner controls can be used for new designs:
 LME1...
 LME2...
 LME3...
 LME4...
General features
Special features

Siemens LGA63.191A27 Specifications

General

Brand	Siemens
Model	LGA63.191A27
Product Type	Controller
Frequency	50 / 60 Hz
Safety Time	3 s
Standards	EN 298
Application	For gas burners
Voltage	230V AC

Summary

Gas Burner Controls Overview

Use and Features

LGA controls are for startup/supervision of atmospheric gas burners in intermittent operation, supervised by an ionization probe.

Special Features

Includes undervoltage detection and air pressure supervision with functional check.

Safety and Mounting Warnings

General Warning Notes

Essential warnings to avoid injury, damage, and environmental harm during operation and maintenance.

Earthing Requirement

Attention: Earth the burner per regulations; boiler earthing alone is insufficient.

Ionization Probe Positioning

Position probe and electrode to prevent ignition spark arcing over to the ionization probe.

Installation Procedures

Installation Notes

Electrical Connections and Commissioning

Ionization Probe Connection

Guidance on connecting the ionization probe for reliable flame signal transmission.

Commissioning Safety Checks

Mechanical Design and Features

Undervoltage Detection

Electronic circuit preventing startup or causing lockout on mains voltage drops below AC 165 V.

Technical Data and Safety Precautions

General Unit Data

Caution: Water Ingress

Warning regarding condensation, ice, and water ingress leading to safety risks and electric shock.

Flame Supervision

Ionization Probe Flame Supervision

Functionality and Control Sequences

Startup Sequence

Conditions required for burner control startup, including input signals and safety checks.

Undervoltage Detection

Reversed Polarity Protection

Fault Management and Flame Supervision

Fault Sequence and Lockout

Immediate deactivation of outputs and lockout indication on fault occurrence.

Fault Causes and Responses

Flame Supervision Mechanism

Connection Diagrams and Program Sequences

LGA41 Connection and Program Sequence

Diagrams showing required inputs, outputs, and the startup program sequence for LGA41.

LGA52/LGA63 Connection and Program Sequence

Diagrams showing required inputs, outputs, and the startup program sequence for LGA52/LGA63.