LME71.112A1PKG-PRG2 Siemens Flame Safeguard

Overview

The Siemens LME71.112A1PKG-PRG2 is a high-performance, microprocessor-based flame safeguard assembly designed for the startup and supervision of multistage or modulating forced draft gas or oil burners. This specific package includes the LME71.000A1 basic unit, the PME71.112A1 program module, and a complete plug set. Engineered for industrial and commercial burner applications, it provides critical safety functions by controlling the ignition sequence and monitoring the flame to ensure safe operation. The “PRG2” designation indicates a preprogrammed configuration tailored for specific system requirements, offering a reliable solution for burner management without a purge cycle.

Features

• Digital signal handling ensures highly accurate and repeatable control sequences
• Integrated multicolor LED provides clear indication of operating status and detailed error messages
• Built-in 3 x 7-segment display for local service, status, and error information diagnostics
• Undervoltage detection mechanism to protect the system during power fluctuations
• Electrical remote lockout reset facility for improved operational convenience
• Air pressure supervision with a functional check of the air pressure switch during startup
• BC interface allows for connection to external display units (AZL2) or PC-based service tools (ACS410)
• Designed for controlled intermittent operation with a restart limitation for enhanced safety

Specifications

• Model: LME71.112A1PKG-PRG2
• Basic Unit: LME71.000A1
• Program Module: PME71.112A1 (No Purge)
• Mains Voltage: AC 120 V (+10% / -15%)
• Frequency: 50 to 60 Hz
• Power Consumption: Approximately 12 VA
• Protection Rating: IP40 (when mounted correctly)
• Safety Class: I
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 2.0 lbs (0.91 kg)
• Designed Lifetime: 250,000 burner startup cycles (approx. 10 years)

Applications

• Supervision of multistage or modulating forced draft gas and oil burners
• Used in atmospheric gas burners of medium to large capacity
• Suitable for systems requiring burner control without a pre-purge sequence
• Ideal for HVAC and boiler systems in industrial process heating and thermal plants
• Compatible with various flame detectors including ionization probes and UV flame detectors (QRA series)
• Integration into gas trains for 1- or 2-stage forced draft burners in intermittent operation