Siemens LGB21.330A27 User Manual

CC1N7435en
11.01.2007
Building Technologies
HVAC Products
7
435
Burner Controls LGB...
Burner controls for the supervision of 1- or 2-stage gas or gas / oil burners of
small to medium capacity (typically up to 350 kW), with or without fan, in intermit-
tent operation.
The LGB... and this Data Sheet are intended for use by OEMs which integrate the
burner controls in their products!
Use
The LGB... burner controls are used for the startup and supervision of 1- or 2-stage gas
or gas / oil burners in intermittent operation.
Depending on the type of burner control used, the flame is supervised either by an
ionization probe, a blue-flame detector QRC1... for forced draft gas / oil burners, or a
UV detector QRA... (with auxiliary unit AGQ1...A27).
In connection with the respective adapters, the LGB... burner controls replace their
predecessor types LFI7... and LFM1... (also refer to «Replacement types» under «Or-
dering»).
- Automatic forced draft burners for gaseous fuels to EN 676
- Gas burner controls to EN 298
- Undervoltage detection
- Air pressure supervision with function check of the air pressure switch during
startup and operation
- Electrical remote reset facility
- LGB41... for use with atmospheric gas burners

Siemens LGB21.330A27 Specifications

General

Brand	Siemens
Model	LGB21.330A27
Category	Control Unit
Language	English

Summary

Burner Controls

Use

Overview of burner controls for small to medium capacity gas or gas/oil burners.

Safety and Installation Notes

Essential warnings, mounting, and installation guidelines for safe operation.

Electrical Connection and Commissioning

Guidance on connecting flame detectors and performing commissioning safety checks.

Standards and Certificates

Overview of certifications, compliance with EEC directives, and service notes.

Disposal Notes

Instructions for environmentally sound disposal of electronic components.

Mechanical Design and Type Summary

Details on housing construction and product type classifications.

Ordering Information

Guidelines for ordering burner controls, accessories, and replacement parts.

Technical Data and Environmental Conditions

Specifications for mains voltage, frequency, current ratings, and operating environments.

Flame Supervision Methods

Methods and circuits for supervising flame presence using ionization, blue-flame, or UV detectors.

Functions and Control Sequences

Explanation of burner startup sequence, safety times, and operational functions.

Fault Handling and Lockout Procedures

Behavior during faults, lockout conditions, and procedures for resetting the burner control.

Connection Diagrams

Wiring diagrams for LGB21, LGB22, LGB32, and LGB41 series burner controls.

Internal Diagrams and Timing Mechanisms

Internal circuitry and timing sequences for programming mechanisms of LGB series.

Product Dimensions

Physical dimensions of the LGB burner controls and auxiliary units.