Siemens LGA52.171B27 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 LGA52.171B27 Specifications

General

Brand	Siemens
Model	LGA52.171B27
Category	Controller
Language	English

Summary

Gas Burner Controls Overview

Use and Features Summary

Describes the general and special features of the gas burner controls for atmospheric gas burners.

Safety and Warning Notes

General Warning Notes

Lists crucial warnings to avoid injury, damage, and environmental harm during operation.

Mounting and Installation Precautions

Installation and Wiring

General Installation Guidelines

Neutral Conductor Wiring

Ionization Probe and Commissioning

Ionization Probe Electrical Connection

Details on achieving disturbance-free signal transmission for the ionization probe.

Commissioning Safety Checks

Outlines essential safety checks and their anticipated responses during commissioning.

Technical Specifications

General Unit Data and Electrical Specifications

Provides mains voltage, frequency, power consumption, and terminal current ratings.

Environmental and Operational Conditions

Condensation and Water Ingress Warning

Flame Supervision Details

Ionization Probe Flame Supervision

Explains detector voltage, current, cable length, and insulation resistance for flame supervision.

AC 110 V Control Supervision

Functional Operation and Control Sequence

Burner Startup Sequence

Details the required input signals and conditions for a successful burner startup.

Undervoltage and Polarity Protection

Control Sequence Timing

Fault Handling and Lockout

Fault Sequence and Responses

Details fault causes, lockout responses for different LGA models, and lockout handling.

Burner Control Reset Procedure

Explains how to reset the burner control after a lockout event.

Internal Diagram: LGA41...

LGA41... Operational Description

Internal Diagram: LGA52.../LGA63...

LGA52.../LGA63... Operational Description