LME71.112A1PKG-PRG3 Siemens Flame Safeguard

Overview

The Siemens LME71.112A1PKG-PRG3 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 preprogrammed package includes the LME71.000A1 basic unit, the PME71.112A1 program module, and a complete connector plug set. Engineered for industrial and commercial combustion applications, this unit provides critical safety functions by managing fuel-air ratios and monitoring flame presence to prevent hazardous conditions. The LME71.112A1 model is specifically configured for operations without a purge cycle, making it suitable for specific burner sequences where pre-purging is not required or is handled by other system components.

Features

• Digital signal handling ensures an extremely accurate and repeatable control sequence
• Integrated BC interface allows for connection to a PC or an AZL23 remote display unit for status monitoring and parameter adjustments
• Multicolor LED signal lamp provides clear visual status updates for operation, recycles, and fault notifications
• Proof of Closure (POC) input allows for monitoring of the gas valve position to ensure it is 100% closed during shutdown
• Electrical remote lockout reset facility enables system restarts from a distance
• Undervoltage detection triggers a safety shutdown if power levels fall below operational requirements
• Compatible with ionization probes or UV flame detectors (such as the QRA series) for flexible flame supervision options

Specifications

• Model: LME71.112A1PKG-PRG3
• Components Included: LME71.000A1 base, PME71.112A1 module, AGG3.710 plug set
• Mains Voltage: AC 120 V (50/60 Hz)
• Operation Type: Intermittent (at least one controlled shutdown every 24 hours)
• Purge Timing: No purge (0 seconds)
• Safety Class: IP40 (when installed correctly)
• Power Consumption: Approximately 12 VA
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 2.0 lbs (0.91 kg)
• Approvals: UL listed, FM approved, CSA certified

Applications

• Supervision of multistage or modulating forced draft gas burners
• Ideal for medium to high-capacity industrial thermal process applications
• Used in HVAC and boiler systems requiring precise burner control without a pre-purge sequence
• Suitable for atmospheric burners and forced draft oil/gas burner systems
• Integration into complex gas trains where Proof of Closure and air pressure supervision are required for safety compliance