LME71.112A1PKG Siemens Flame Safeguard

Overview

The Siemens LME71.112A1PKG is a comprehensive, microprocessor-based flame safeguard control package designed for the supervision of multistage or modulating forced draft gas burners. This preassembled assembly simplifies installation by including the LME71.000A1 basic unit, a specific PME71.112A1 programming module, and a complete connector plug kit. Engineered for intermittent operation, the LME71 series provides critical safety functions by managing burner startup and monitoring the flame to ensure secure operation of safety shut-off valves. The “112” variant is specifically configured for applications that do not require a purge cycle.

Features

• Comprehensive package includes the base unit, program module, and AGG3.710 terminal plug set
• Digital signal handling ensures an accurate and repeatable control sequence
• Built-in 3×7-segment display provides detailed service, error, and status information
• Multicolor LED signal lamp indicates operating status and fault notifications
• Integrated BC interface allows for connection to a remote display (AZL2) or PC software (ACS410)
• Proof-of-Closure (POC) switch monitoring for enhanced safety valve supervision
• Supports multiple flame detection methods including UV scanners or flame rods
• Accurate undervoltage detection and electrical remote lockout reset facility
• Adjustable safety parameters and password-protected OEM settings for tailored application fits

Specifications

• Model: LME71.112A1PKG
• Operating Voltage: AC 120 V (50/60 Hz)
• Configuration: No Purge (PME71.112A1)
• Operation Mode: Intermittent (at least one controlled shutdown every 24 hours)
• Flame Supervision: Ionization probe, QRA2, QRA4, or QRA10 UV detectors
• Protection Rating: IP40 (when integrated correctly)
• Weight: Approximately 2.0 lbs
• Interface: Modbus RTU or BACnet MS/TP communication (via optional modules)
• Mounting: Integrated into burner or control panel via plug-in terminals

Applications

• Supervision of atmospheric and forced draft gas burners of medium to large capacity
• Industrial and commercial combustion plants requiring linkageless control
• Gas-fired equipment where a purge cycle is not required by local codes or application design
• Use in HVAC systems and boiler control for precise fuel-to-air ratio management
• Suitable for systems requiring integration with building management systems via Modbus or BACnet