LME71.402A1PKG-PRG1 Siemens Flame Safeguard

Overview

The Siemens LME71.402A1PKG-PRG1 is a comprehensive, preprogrammed flame safeguard package designed for the startup and supervision of 1- or 2-stage gas burners in intermittent operation. This microprocessor-based unit serves as a central controller for industrial and commercial burner systems, ensuring safety by monitoring the flame and managing the fuel-to-air ratio. This specific “PKG” model comes preassembled and preprogrammed, including the LME71.000A1 burner control base unit, the PME71.402A1 program module, and a complete connector plug kit, streamlining installation and commissioning for HVAC professionals and OEMs.

Features

• Preprogrammed with the PME71.402A1 module, offering specific burner sequences for immediate integration
• Integrated 3-color LED signal lamp provides clear visual status for operation, recycling, and fault notifications
• Features a built-in 3 x 7-segment display for local monitoring of service, error, and status information
• Digital signal handling ensures highly accurate and repeatable control sequences
• Air pressure supervision with a built-in function check of the air pressure switch during start and operation
• Includes Proof of Closure (P.O.C.) and adjustable pre-purge time for enhanced system safety
• Remote lockout reset facility allows for efficient troubleshooting and system restarts
• Supports Modbus communication via optional modules for integration into building management systems

Specifications

• Model: LME71.402A1PKG-PRG1
• Mains Voltage: AC 120 V (+10% / -15%)
• Frequency: 50/60 Hz
• Components: LME71.000A1 base, PME71.402A1 module, and plug kit
• Flame Detection: Ionization probe or UV flame detector (e.g., QRA2, QRA4, QRA10)
• Flame Failure Response Time (FFRT): 1 second
• Safety Class: Protective Class I
• Power Consumption: Approximately 12 VA
• Weight: Approximately 5.0 lbs (2.27 kg)
• Operating Temperature: -20 C to +60 C

Applications

• Supervision of multistage or modulating forced draft gas burners in commercial and industrial settings
• Ideal for atmospheric burners of medium to large capacity
• Used in HVAC and boiler systems requiring controlled intermittent operation (lockout at least once every 24 hours)
• Suitable for systems requiring precise air pressure monitoring and safety shut-off valve control
• Optimized for linkageless burner management applications when used with compatible Siemens components