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


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