Siemens LME21.350A2 User Manual

CC1N7101en
27.11.2008
Building Technologies
HVAC Products
7
101
Burner Controls LME...
Burner controls for the supervision of 1- or 2-stage gas or gas / oil burners of
small to medium capacity, operation, with or without fan in intermittent.
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 or
gas / oil burners in intermittent operation. The flame is supervised by an ionization
probe or flame detector QRA… with ancillary unit AGQ3…A27 for gas / oil forced draft
burners 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»).
- For gas burners with or without fan to EN 298: 2003
- For gas burners with fans conforming to EN 676
- For oil burners to EN 230: 2005
- 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
Supplementary documentation
Product Range Overview LME…............................................................................ Q7101
Use
Features

Siemens LME21.350A2 Specifications

General

Mounting Type	DIN Rail
Application	Industrial Automation
Voltage	24 V DC
Frequency	50/60 Hz
Protection Class	IP20
Type	Controller

Summary

Burner Controls Overview

Use and Features

Details on the application and key features of LME burner controls.

Safety and Installation Guidelines

Warning, Engineering, and Mounting Notes

Crucial safety instructions, engineering considerations, and mounting guidelines.

Installation and Wiring Notes

Flame Detector Electrical Connection

Commissioning, Standards, and Service

Commissioning Safety Checks

Essential safety checks required during plant commissioning and maintenance.

Technical Specifications

Type Summary for Burner Controls

Detailed comparison of different LME burner control types and parameters.

General Unit and Environmental Data

Flame Supervision Technical Data

Specific data for ionization, UV, and blue-flame supervision methods.

Burner Control Functions

Startup, Undervoltage, and Intermittent Operation

Fault Handling, Resetting, and Repetitions

Procedures for managing faults, lockout, resetting, and repetition limits.

Operation and Diagnostics

Diagnostics of Fault Causes

Methods to diagnose fault causes using LED blink codes and interface diagnostics.

Wiring Diagrams and Application Examples

LME11... Connection Diagram and Control Sequence

LME21... Connection Diagram and Control Sequence

LME22.../LME23... Connection Diagram and Control Sequence

LME41... Connection Diagram and Control Sequence

LME44... Connection Diagram and Control Sequence