LME73.840A1PKG-PRG2 Siemens Flame Safeguard

Overview

The Siemens LME73.840A1PKG-PRG2 is a high-performance, microprocessor-based flame safeguard assembly designed for the startup and supervision of multistage or modulating forced draft gas and oil burners. This specific package is a preprogrammed version of the LME73.840A1PKG, which includes the LME73.000A1 basic unit, the PME73.840A1 program module, and a complete plug set. It is engineered to manage critical combustion safety functions, including valve proving and actuator control, ensuring reliable ignition and continuous flame supervision in industrial and commercial heating plants.

Features

• Modular Design: Composed of a basic unit and a replaceable program module for flexible system integration and easier servicing.
• Integrated Safety: Provides automatic safety shutdown and electronic self-supervision for high-demand burner cycles.
• Actuator Control: Capable of driving and proving actuator positions for purge and ignition using closed-loop control; actuator control can be disabled if necessary.
• Valve Proving: Features built-in valve proving functionality to ensure gas valve integrity before burner startup.
• Multi-color Diagnostics: Includes a 3-color LED signal lamp and a 7-segment display for clear status messaging and error code identification.
• Undervoltage Detection: Automatically monitors for low voltage conditions to prevent unsafe burner operation.
• Remote Reset: Supports electrical remote lockout reset for improved system manageability.

Specifications

• Model: LME73.840A1PKG-PRG2
• Mains Voltage: AC 120 V (+10% / -15%)
• Frequency: 50/60 Hz
• Power Consumption: Approximately 3.5 VA
• Protection Rating: IP40 (when installed)
• Operating Temperature: -20 C to +60 C
• Designed Lifetime: 250,000 burner startup cycles (approx. 10 years under normal heating mode)
• Component Weights: Assembly weight approximately 5 lbs
• Flame Supervision: Supports ionization probes or UV flame detectors (such as QRA series)

Applications

• Supervision of multistage or modulating forced draft gas or oil burners.
• Industrial and commercial boiler rooms, furnaces, and thermal process plants.
• Atmospheric gas burners of medium to high capacity.
• Systems requiring integrated valve proving and precise linkageless fuel-air ratio control.
• Intermittent operation burner management where controlled air damper control is essential.