The Siemens LAL 2.65 is a robust burner control unit designed for the startup and supervision of multi-stage or modulating oil burners. It is engineered for intermittent operation, providing comprehensive monitoring of the air damper, fuel valves, and flame signal. In Thermax boiler applications, it is prized for its long pre-purge time ($t_1$) of 67 seconds and its ability to manage complex ignition sequences safely.
Feature: Technical Data
Product Model: Siemens LAL 2.65
Operating Voltage: AC 220 V – 240 V
Frequency: 50...60 Hz
Pre-purge Time ($t_1$): 67 Seconds
Safety Time ($t_{TSA}$): 5 Seconds
Pre-ignition Time ($t_3$): 7 Seconds
Degree of Protection: IP40
Application: Medium to Large Capacity Oil Burners (Multi-Stage/Modulating)
Actuator Control: Manages air damper actuators to ensure correct air-to-fuel ratios during low-fire, high-fire, and modulating phases.
Extended Pre-purge: Features a 67-second pre-purge period, ideal for large combustion chambers in industrial boilers.
Flame Supervision: Compatible with QRB... photo-resistive detectors or RAR... selenium photocell detectors for reliable oil flame monitoring.
Fault Positioning: Includes a sequence indicator that stops at the exact point of failure, allowing for rapid diagnostics in boiler rooms.
Self-Checking Logic: Automatically verifies the flame signal and safety circuits during the startup sequence to prevent accidental fuel release.
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