LME71.111A2PKG-PRG17 Siemens Flame Safeguard

Overview

The Siemens LME71.111A2PKG-PRG17 is a high-performance, microprocessor-based flame safeguard designed for the startup and supervision of 1- or 2-stage gas forced draft burners in intermittent operation. This specific package includes the LME71.000A2 basic unit, a PME71.111A2 program module, and a complete plug kit. It is preprogrammed (PRG17) to provide reliable burner sequencing and safety monitoring for medium to high-capacity combustion systems. The system provides critical safety functions by energizing safety shutoff valves while monitoring for the presence of a flame via ionization probes or UV detectors.

Features

• Comprehensive monitoring of safety interlocks with independent wiring for specific fault indication
• Integrated 3-color LED signal lamp and a 3 x 7-segment display for status, service, and error information
• Accurate digital signal handling for precise control of sequence timing
• Air pressure supervision with a functional check of the air pressure switch during startup and operation
• Built-in Proof of Closure (POC) input for enhanced safety monitoring of fuel valves
• Electrical remote lockout reset facility for convenient system management
• Undervoltage detection to prevent improper operation during power fluctuations
• Modular design with plug-in space for PME7 program modules allowing for application flexibility

Specifications

• Model: LME71.111A2PKG-PRG17
• Operating Voltage: AC 230 V (50/60 Hz)
• Power Consumption: Approximately 12 VA
• Safety Class: I
• Degree of Protection: IP40 (when installed)
• Operating Temperature: -20 C to +60 C
• Designed Lifetime: 250,000 burner startup cycles (approx. 10 years)
• Flame Detection: Ionization probe or UV flame detectors (QRA2, QRA4, QRA10)
• Approvals: CE, UL, FM, CSA, and Pressure Equipment Directive (2014/68/EU) compliance

Applications

• Supervision of forced draft gas or oil burners in commercial and industrial settings
• Multi-burner applications requiring flexible and independent flame safety control
• Integration into gas trains for 1-stage or 2-stage direct or pilot ignited burners
• Intermittent operation cycles where the burner is restarted at least once every 24 hours
• Suitable for use in HVAC systems, large boiler plants, and thermal process applications