LME71.901A1PKG-PRG4 Siemens Flame Safeguard

Overview

The Siemens LME71.901A1PKG-PRG4 is a comprehensive microprocessor-based flame safeguard control package designed for the startup and supervision of multistage or modulating forced draft burners and atmospheric gas burners. This preprogrammed assembly integrates the LME71.000A1 basic unit with the PME71.901A1 programming module and a complete plug set. It is specifically engineered for applications utilizing Pulse Width Modulated (PWM) fans and pneumatic ratio control, providing a high level of safety by monitoring the flame via ionization probe or UV sensors and controlling safety shutoff valves.

Features

• Microprocessor-based control for precise burner sequence management and continuous operation supervision
• Integrated PWM fan motor control via 3-position controller or analog signal
• Multicolor LED signal lamp for clear indication of error status, program sequence, and operating states
• Built-in 3 x 7-segment display for detailed service, error, and status information
• Integrated valve proving (Proof of Closure) to ensure safety shutoff valves are 100% closed
• Electrical remote lockout reset facility and undervoltage detection
• Accurate digital signal handling for consistent control sequences
• Air pressure supervision with functional check of the air pressure switch during startup and operation

Specifications

• Model: LME71.901A1PKG-PRG4
• Mains Voltage: AC 120 V (50/60 Hz)
• Power Consumption: 12 VA
• Safety Class: I
• Degree of Protection: IP40 (when mounted)
• Operating Temperature: -20 C to +60 C
• Design Lifetime: 250,000 burner startup cycles (approx. 10 years)
• Approvals: UL, FM, CSA, and CE compliance
• Components Included: LME71.000A1 basic unit, PME71.901A1 program module, and AGG3.710 connector plug set

Applications

• Supervision of multistage or modulating forced draft gas and oil burners
• Specifically designed for burners using PWM fans and pneumatic fuel-air ratio control
• Industrial thermal process applications and commercial heating systems
• Intermittent operation requirements where the burner must shut down at least once every 24 hours
• Compatible with ionization probes and various Siemens UV scanners such as QRA2, QRA4, and QRA10