Siemens LME44 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 LME44 series Specifications

General

Brand	Siemens
Model	LME44 series
Category	Control Unit
Language	English

Summary

Technical Data

Flame Supervision with Ionization Probe

Details flame supervision using ionization probes, including voltage and current values.

Flame Supervision with AGQ3 and UV Detector QRA

Explains flame supervision using UV detectors and the AGQ3 ancillary unit.

Flame Supervision with QRC

Covers flame supervision for QRC detectors, including detector current and LED indication.

Functions

Undervoltage

Describes the safety shutdown triggered by mains voltage drops below a threshold.

Controlled intermittent operation

Control sequence in the event of fault

Details the burner's response to various fault conditions and potential causes.

Resetting the burner control

Operation, Indication, and Diagnostics

Operation and Controls

Operational Status Indication

Diagnostics of the Cause of Fault

Details how to activate and interpret error codes displayed by the LED to diagnose faults.

Application Examples

LME11, LME21, LME22 Wiring Schemes

LME22, LME23 Connection Diagrams

LME22 Modulating Burner Examples