LME71.111A2PKG-PRG20 Siemens Flame Safeguard

Overview

The Siemens LME71.111A2PKG-PRG20 is a high-performance, microprocessor-based flame safeguard assembly designed for the supervision of 1-stage gas or oil forced draft burners. This specific package is preprogrammed and typically includes the LME71.000A2 basic unit, a PME71.111A2 program module, and a connector plug set. It provides critical safety functions, including the control of safety shutoff valves and the monitoring of flame signals via ionization probes or UV detectors. Engineered for intermittent operation, the LME71 series offers a flexible and reliable solution for industrial and commercial combustion systems, featuring digital signal handling and multi-color LED status indicators.

Features

• Comprehensive flame supervision for 1-stage, direct or pilot ignited forced draft burners
• Preprogrammed with specific parameter sets (PRG20) for streamlined installation
• Integrated Proof of Closure (POC) input and air pressure supervision with function check
• Multi-color LED signal lamp provides clear status, program sequence, and fault notifications
• Digital signal handling ensures accurate control sequences and high repeatability
• Electrical remote lockout reset facility for convenient system management
• BC interface for connecting display units (AZL2) or PC-based service tools
• Undervoltage detection and limitation of restarts for enhanced safety

Specifications

• Model: LME71.111A2PKG-PRG20
• Operating Voltage: AC 230 V (50/60 Hz)
• Power Consumption: Approximately 12 VA
• Flame Detection: Ionization probe or UV flame detectors (e.g., QRA2, QRA4, QRA10)
• Response Time: Factory setting 3 seconds (adjustable to 1 second via parameters)
• Protection Rating: IP40 (when installed)
• Operating Temperature: -20 C to +60 C
• Safety Class: I
• Weight: Approximately 5 lbs (kit including plugs and module)
• Approvals: CE, UL, FM, and CSA (varies by specific regional model)

Applications

• Supervision of medium to large capacity gas or oil forced draft burners
• Industrial thermal process plants and boiler systems (compliant with EN 676 and EN 746-2)
• Multi-burner configurations requiring individual burner safety control
• HVAC systems utilizing atmospheric or forced draft combustion equipment
• Suitable for both new installations and as a replacement for legacy burner controls in standard 1-stage applications