LME71.901A1PKG-PRG2 Siemens Flame Safeguard

Overview

The Siemens LME71.901A1PKG-PRG2 is a comprehensive flame safeguard package designed for the startup and supervision of multistage or modulating forced draft gas burners. This preprogrammed assembly consists of the LME71.000A1 burner control unit, the PME71.901A1 program module, and a complete connector plug set. It is specifically engineered for applications utilizing PWM (Pulse Width Modulation) fan motors and pneumatic fuel-air ratio control. The system provides critical safety functions by energizing safety shutoff valves while continuously monitoring the flame to prevent hazardous conditions during intermittent burner operation.

Features

• Preprogrammed assembly including basic unit, program module, and connector plug set for simplified installation
• Integrated PWM fan motor control via 3-position controller or analog signal
• Multicolor LED display providing clear indication of error status, program sequence, and operating messages
• Digital signal handling for high-accuracy control sequences and repeatable performance
• Self-checking flame supervision compatible with UV scanners or ionization probes
• Integrated valve proving and Proof of Closure (POC) input for enhanced combustion safety
• Electrical remote lockout reset facility for convenient system management
• Undervoltage detection and air pressure supervision with functional checks during start and operation

Specifications

• Model: LME71.901A1PKG-PRG2
• Mains Voltage: AC 120 V (50/60 Hz)
• Power Consumption: Approximately 12 VA
• Safety Class: I
• Protection Rating: IP40 (when installed)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 5 lbs (2.27 kg)
• Designed Lifetime: 250,000 burner startup cycles (approx. 10 years)
• Approvals: UL, FM, CSA, and CE compliant

Applications

• Supervision of multistage or modulating forced draft gas burners in commercial and industrial settings
• Specifically designed for burners utilizing PWM blowers for air-fuel ratio control
• Atmospheric gas burners of medium to large capacity
• Industrial thermal process applications requiring precise intermittent operation
• HVAC and boiler systems requiring safety shut-off control with integrated valve proving functions