Siemens LME21 series

CC1N7101en
29.06.2006
Building Technologies
HVAC Products
7
101
Gas Burner Controls LME...
Gas burner controls for the supervision of 1- or 2-stage gas burners of small to
medium capacity (typically up to 350 kW), in intermittent operation.
The LME… and this Data Sheet are intended for use by OEMs which integrate the
burner controls in their products.
Use, features
LME… burner controls are used for the startup and supervision of 1- or 2-stage gas
burners in intermittent operation. The flame is supervised by an ionization probe or
flame detector QRA… with ancillary unit AGQ3… or blue–burning flames with blue-
flame detectors QRC...
In terms of housing dimensions, the LME... are identical with the LGB… and LMG…
burner controls (refer to «Type summary»).
- Burner controls conforming to EN 298
- For gas burners with fans conforming to EN 676
- Undervoltage detection
- Air pressure supervision with functional check of the air pressure switch during
startup and operation
- Electrical remote reset facility
- Multicolor indication of fault status and operational status messages
- Limitation of the number of repetitions
- Accurate control sequence thanks to digital signal handling
- Controlled intermittent operation after 24 hours of continuous operation
Use
Features

Siemens LME21 series Specifications

General

Brand	Siemens
Model	LME21 series
Category	Control Unit
Language	English

Summary

Gas Burner Controls LME Series Overview

Use of LME Burner Controls

Key Features of LME Burner Controls

Safety and Operational Notes

General Safety Warning Notes

Details critical safety precautions for handling, installation, and operation to prevent injury or damage.

Engineering and Mounting Notes

Installation and Connection Details

Installation Notes and Wiring

Flame Detector Connection Best Practices

Type Summary and Technical Specifications

Burner Control Type References and Compatibility

Provides a summary of LME burner control type references with technical specifications and compatibility for replacing older models.

Technical Data - General Unit Information

General Unit Specifications

Specifies mains voltage, frequency, power consumption, weight, safety class, and degree of protection.

Technical Data - Flame Supervision with Ionization Probe

Ionization Probe Supervision Data

Provides technical data for flame supervision using ionization probes, including detector voltage and switching thresholds.

Technical Data - UV Detector Supervision

UV Detector and Ancillary Unit Data

Details specifications for UV detector supervision with AGQ3 ancillary unit, including connection and testing.

Technical Data - QRC Detector and LEDs

QRC Detector Supervision Data

Provides technical data for flame supervision using QRC blue-flame detectors, including detector current requirements.

Burner Control Functions and Fault Handling

Startup Preconditions and Operation

Lists startup conditions, undervoltage effects, and controlled intermittent operation.

Fault Response and Resetting Procedures

Details control sequence for faults, lockout, and procedures for resetting the burner control.

Operation, Indication, and Visual Diagnostics

Operation and Reset Button Functionality

Visual Diagnostics via Multicolor LED

Diagnostics of Fault Causes and Remedies

Error Code Table and Fault Interpretation

Details the error code table correlating LED blink codes with possible causes of faults and their remedies.

Connection Diagram and Control Sequence - LME11

LME11 Control Sequence and Wiring Diagram

Connection Diagram and Control Sequence - LME21

LME21 Control Sequence and Wiring Diagram

Connection Diagram and Control Sequence - LME22 LME23

LME22 LME23 Control Sequence and Wiring Diagram

Connection Diagram and Control Sequence - LME44

LME44 Control Sequence and Wiring Diagram