Siemens LME22 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 LME22 series Specifications

General

Category	Control Unit
Series	LME22
Restart Lockout	Yes
Frequency	50/60 Hz
Operating Temperature	-20...+60 °C
Storage Temperature	-40°C to +85°C
Relative Humidity	95% (non-condensing)

Summary

Product Overview

Key Features

Includes undervoltage detection, air pressure supervision, remote reset, and status indication.

Safety and Operational Notes

General Safety Warnings

Crucial safety warnings regarding unit modification, electrical safety, and handling.

Installation and Connection Details

Flame Detector Connection

Best practices for disturbance-free signal transmission from flame detectors.

Commissioning, Standards, and Disposal

Commissioning Safety Checks

Procedure for safety checks during first-time commissioning or maintenance.

Technical Data - General

General Unit Specifications

Specifications for mains voltage, frequency, power, weight, and protection.

Technical Data - Flame Supervision

Ionization Probe Supervision

Detector voltage, switching thresholds, and current for ionization probe supervision.

Technical Data - UV Flame Supervision

UV Detector QRA Supervision

Detector voltage and current signals for UV detector QRA... with AGQ3...

UV Ancillary Unit and Circuit

Mandatory use of UV ancillary unit AGQ3... and its measuring circuit.

Technical Data - QRC Flame Supervision

QRC Detector Current Data

Detector current requirements and limits for QRC... flame detectors.

LED Status Indication

Functions and Fault Management

Startup, Operation, and Protection

Fault Control and Resetting

Table of fault causes, responses, and procedure for resetting the burner control.

Repetition Limits

Diagnostics of Fault Causes

Activating Fault Diagnostics

Procedure to activate visual diagnostics via the error code table.

Error Code Table

Mapping of LED blink codes to specific fault causes.