LME71.111A1PKG-PRG4 Siemens Flame Safeguard

Overview

The Siemens LME71.111A1PKG-PRG4 is a high-performance, microprocessor-based flame safeguard assembly designed for the startup and supervision of 1- or 2-stage gas forced draft burners. This specific package comes preprogrammed and includes the LME71.000A1 burner control unit, the PME71.111A1 program module, and a complete AGG3.710 connector plug set. Engineered for intermittent operation, it provides critical safety functions by energizing safety shutoff valves and monitoring flame presence via ionization probes or UV flame detectors. Its digital signal handling ensures accurate control sequences and sophisticated diagnostics for industrial thermal process applications.

Features

• Microprocessor-based control with digital signal handling for high accuracy
• Integrated program module (PME71.111A1) supporting programmable purge times
• Multi-color LED signal lamp for clear indication of operating status and fault messages
• Built-in 3 x 7-segment display for local service and error diagnostics
• Electrical remote lockout reset facility for convenience in large installations
• Support for Proof of Closure (POC) input to monitor fuel valve status for enhanced safety
• Undervoltage detection and air pressure supervision with functional checks during startup
• BC interface for connection to remote displays (AZL2) or PC software (ACS410)
• Designed for a service life of approximately 250,000 burner startup cycles

Specifications

• Model Number: LME71.111A1PKG-PRG4
• Operating Voltage: AC 120 V (+10% / -15%)
• Frequency: 50/60 Hz
• Power Consumption: Approximately 12 VA
• Protection Rating: IP40 (when built-in)
• Operating Temperature: -20 C to +60 C
• Safety Class: I
• Flame Supervision: Ionization probe, QRA2, QRA4, or QRA10 UV detectors
• Approvals: UL, FM, CSA, and CE compliance
• Shipping Weight: Approximately 1.68 lbs to 5 lbs (depending on packaging)

Applications

• Supervision of multistage or modulating forced draft gas burners
• Ideal for medium to large capacity industrial thermal process plants
• Atmospheric gas burners requiring precise fuel-air ratio control
• Suitable for systems utilizing PWM fan motors for air flow control
• Combustion systems requiring automated safety shut-off and purge sequences
• HVAC and boiler systems in industrial and commercial heating applications