LME71.000A1 Siemens Burner Control

Overview

The Siemens LME71.000A1 is a microprocessor-based burner control unit designed for the startup and supervision of multistage or modulating forced draft gas burners in intermittent operation. As the fundamental “base unit” of the LME7 series, it provides high-precision flame safeguard (FSG) management for medium to high-capacity burners. The unit requires a plug-in program module (PME71 series) to define its specific functional sequence and is engineered to enhance safety through integrated diagnostics, undervoltage detection, and air pressure supervision.

Features

• Digital signal handling ensures an accurate and repeatable control sequence
• Multicolor LED signal lamp and 3×7-segment display for status, service, and error information
• Integrated Proof of Closure (POC) input to monitor valve sealing and enhance combustion safety
• Air pressure supervision with functional checks of the air pressure switch during startup and operation
• Electrical remote lockout reset facility and undervoltage detection for increased reliability
• BC interface allows for connection to an AZL2 display unit or PC for advanced parameterization
• Compatible with ionization probes and a variety of UV flame detectors, including QRA2, QRA4, and QRA10

Specifications

• Model: LME71.000A1
• Mains Voltage: AC 120 V (+10% / -15%)
• Mains Frequency: 50/60 Hz
• Power Consumption: Approximately 12 VA
• Safety Class: I (with plug-in base)
• Protection Rating: IP40 (when installed)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 0.85 kg
• Approvals: UL, FM, CSA, and RoHS compliant

Applications

• Supervision of multistage or modulating forced draft oil and gas burners
• Ideal for industrial thermal process applications and commercial heating systems
• Used in intermittent operation where the burner is shut down at least once every 24 hours
• Suitable for linkageless fuel-air ratio control via air damper actuators or PWM fans
• Compatible with gas direct ignition and gas pilot ignition systems across various industrial burner types