Siemens LME11 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 LME11 series Specifications

General

Brand	Siemens
Model	LME11 series
Category	Control Unit
Language	English

Summary

Gas Burner Controls LME Series

Application Use

Describes the application of LME... burner controls for startup and supervision.

Key Features

Lists key features including undervoltage detection and remote reset.

Safety, Engineering, and Mounting Notes

General Safety Warnings

Crucial safety precautions to avoid injury, property damage, or environmental harm.

Installation and Wiring Procedures

Installation Notes

Commissioning, Standards, and Service

Commissioning Safety Checks

Safety checks required for initial plant commissioning and maintenance work.

Burner Control Type Summary

1-Stage Burner Controls

Specifications for LME11... burner controls for 1-stage gas burners.

2-Stage (No Actuator Control)

Specs for LME21... controls for 2-stage burners without actuator control.

2-Stage (With Actuator Control)

2-Stage (Blue Flame)

Burner Control Type Summary (Continued)

Atmospheric Burner Controls

Technical Data: Ionization Flame Supervision

Ionization Probe Parameters

Provides detector voltage, switching thresholds, and current values for ionization probes.

Technical Data: UV Flame Supervision

UV Detector Parameters

Shows detector voltage and current values for UV detectors with AGQ3...

Technical Data: QRC Flame Supervision

QRC Detector Current

Details detector current requirements and values for QRC blue-flame detectors.

Functions and Control Logic

Burner Startup and Undervoltage

Preconditions for startup and safety shutdown on undervoltage.

Intermittent Operation and Faults

Controlled shutdown and response to faults like mains failure or loss of flame.

Resetting and Repetition Limits

Operation, Indication, and Diagnostics

Lockout Reset and LED

Visual Diagnostics Modes

Diagnostics of Fault Causes

Activating Fault Diagnostics

How to access diagnostics to identify the cause of a fault using the error code table.

Error Code Fault Analysis

Lists blink codes, associated terminal signals, and possible causes of faults.

Connection Diagram and Control Sequence (LME11...)

LME11... Control Timing

Connection Diagram and Control Sequence (LME21...)

Application Examples (LME112122)

Application Examples: Modulating Burner Control

2-Stage Modulating Burner Control

Connection Diagram and Control Sequence (LME22... LME23...)

LME2223... Control Timing

Application Examples: Actuator Control

2-Stage Modulating Control Wiring

Connection Diagram and Control Sequence (LME44...)

LME44... Control Timing