LME39.400C2 Siemens Burner Control

Overview

The Siemens LME39.400C2 is a sophisticated, microprocessor-based burner control designed for the startup and supervision of 1- or 2-stage gas or oil burners of small to medium capacity. Engineered for intermittent operation, this controller provides high-precision program sequences through digital signal handling and is primarily intended for integration by original equipment manufacturers (OEMs). It features a grey plastic housing and utilizes a Burner Communication Interface (BCI) for parameterization and diagnostics, making it a versatile component for modern combustion and thermal process plants.

Features

• Microcomputer-controlled program sequences ensure high accuracy and repeatability
• Parameterizable via BCI interface using AZL2 display or ACS410 software for customized burner sequences
• Integrated undervoltage detection and air pressure supervision with functional checks during startup and operation
• Multicolor LED indicator provides clear visual messages for operational status and detailed fault diagnostics
• Electrical remote reset facility allows for efficient system management from a distance
• Automatic controlled intermittent operation triggers a safety shutdown and restart after 24 hours of continuous run time
• Robust safety design includes limitation of the number of repetitions and a designed lifetime of 250,000 startup cycles

Specifications

• Model: LME39.400C2
• Supply Voltage: AC 230 V (50/60 Hz)
• Power Consumption: 12 VA
• Waiting Time (tw): Max 2.5 s
• Safety Time (TSA): Max 5 s
• Preignition Time (t3): Approx 3 s
• Postignition Time (t3n): Approx 4 s
• Purge Time (t1′): 14.5 s
• Protection Rating: IP40 (when installed)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 1.0 kg (2.2 lbs)

Applications

• Supervision of 1- or 2-stage gas or oil burners in commercial and industrial heating systems
• Forced draft burners for liquid or gaseous fuels in accordance with EN 267 and EN 676
• Integration into gas trains and boiler control systems requiring precise electronic ratio control
• High-demand intermittent burner operations in HVAC, thermal processing, and steam generation plants
• Use in systems requiring ionization probe or UV flame detection (with AGQ3 ancillary unit)