LME71.901A2PKG Siemens Flame Safeguard

Overview

The Siemens LME71.901A2PKG is a comprehensive, microprocessor-based flame safeguard assembly designed for the startup and supervision of multistage or modulating forced draft burners and atmospheric gas burners. This preassembled package includes the LME71.000A2 basic unit, a PME71.901A2 program module, and a complete connector plug kit. Engineered for intermittent operation, the LME71 series provides essential safety functions by monitoring flames via ionization probes or UV detectors and controlling safety shutoff valves. It is specifically tailored for applications involving pulse width modulated (PWM) fans and pneumatic fuel-air ratio control.

Features

• Preassembled package including burner control unit, program module, and plug set
• Integrated PWM fan motor control via 3-position controller or analog signal
• Multicolor LED signal lamp for clear status and fault notifications
• 3 x 7-segment display for detailed service, error, and status information
• Digital signal handling ensures highly accurate control sequences
• Air pressure supervision with a function check of the air pressure switch during startup and operation
• Electrical remote lockout reset facility for improved system accessibility
• Integrated valve proving functionality for enhanced safety
• Undervoltage detection to prevent improper equipment operation

Specifications

• Model: LME71.901A2PKG
• Mains Voltage: AC 230 V (50/60 Hz)
• Power Consumption: < 20 VA
• Protection Rating: IP40 (when built-in)
• Designed Lifetime: 250,000 burner startup cycles (approx. 10 years)
• Operating Temperature: -20 C to +60 C
• Safety Class: I
• Approvals: UL, FM, CSA, and CE
• Weight: Approximately 5 lbs
• Dimensions: 12 x 8 x 8 in (packaged)

Applications

• Supervision of multistage or modulating forced draft gas burners
• Industrial and commercial burners requiring PWM fan motor control
• Atmospheric gas burners in intermittent operation
• Burner systems utilizing pneumatic fuel-air ratio control
• Boiler and HVAC systems requiring safety shut-off and burner sequence management
• Integration into gas trains for medium to large-capacity combustion plants