Siemens LME21.330A2 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 LME21.330A2 Specifications

General

Brand	Siemens
Model	LME21.330A2
Category	Controller
Language	English

Summary

Use, features

Use of LME Burner Controls

Describes application of LME burner controls in intermittent operation.

Key Features of LME Controls

Lists key features like undervoltage detection, air pressure supervision, etc.

Warning notes

Unit Integrity and Safety Directives

Essential safety precautions for handling and installation of the unit, avoiding modification.

Installation notes

Electrical connection of flame detectors

Commissioning notes

Burner Startup Safety Checks

Safety checks for burner startup with interrupted flame detector line.

Simulated Flame Failure Test

Procedure for testing burner operation with simulated loss of flame.

Simulated Air Pressure Failure Test

Procedure for testing burner operation with simulated air pressure failure.

Mechanical Design and Features

Type summary (other types of burner controls on request)

Type summary (other types of burner controls on request) [cont'd]

Technical data

General Unit Data

Specifications for mains voltage, frequency, power consumption, weight, and safety class.

Technical data (cont'd)

Flame Supervision (Ionization Probe)

Data on detector voltage, switching thresholds, and currents for ionization probe supervision.

Flame Supervision (UV Detector)

Data for flame supervision using UV detector QRA with AGQ3...A27 ancillary unit.

Flame Supervision (QRC Blue Flame)

Data for flame supervision using QRC blue flame detector with LME23...

Functions

Preconditions for Burner Startup

Conditions that must be met before a burner can start up.

Undervoltage and Intermittent Operation

Functions (cont'd)

Control Sequence in Event of Fault

Responses to various fault conditions like mains failure or loss of flame.

Resetting the Burner Control

Operation, Indication, and Diagnostics

Lockout Reset Button and LED Functionality

Diagnostics of Fault Causes

Activating Visual Diagnostics

How to activate visual diagnostics to determine the cause of a lockout using the reset button.

Error Code Table and Fault Interpretation

Table correlating LED blink codes to specific fault causes and their interpretation.

Connection diagram and control sequence LME11...

LME11 Control Sequence

Diagram and timing chart showing the control sequence for LME11 burner controls.

Connection diagram and control sequence LME21...

LME21 Control Sequence

Diagram and timing chart illustrating the control sequence for LME21 burner controls.

Application examples

Connection diagram and control sequence LME22... / LME23...

LME22/LME23 Control Sequence

Diagram and timing chart showing control sequences for LME22 and LME23 burner controls.

Connection diagram and control sequence LME41...

LME41 Control Sequence

Diagram and timing chart illustrating the control sequence for LME41 burner controls.

Connection diagram and control sequence LME44...

LME44 Control Sequence