SIEMENS LME22.331C2 Gas Burner Controls

Key Features

• Digital Signal Processing – Accurate and repeatable control sequences for enhanced system reliability

• Multicolor LED Indicator – Clear status messages and diagnostic feedback for operational and fault conditions

• Undervoltage Detection – Prevents operation under unsafe electrical conditions

• Air Pressure Supervision – Functional check of the air pressure switch during startup and operation

• Electrical Remote Reset Facility – Allows efficient system management from a distance

• Repetition Limitation – Prevents excessive restart attempts to protect the burner and associated equipment

• Controlled Intermittent Operation – Mandatory safety shutdown after 24 hours of continuous running

• Actuator Control (12s) – Integrated actuator running time for precise air-to-fuel ratio control

Technical Parameters

Core Advantages

1. Seamless Retrofit for Legacy Systems

The LME22.331C2 is specifically engineered as a digital replacement for legacy Siemens LGB and LMG burner control series. It features identical housing dimensions to the LGB and LMG models, enabling drop-in replacement without mechanical modifications. When substituting LGB or LMG controls with LME, the ancillary unit AGQ1… or AGQ2… must be replaced by the AGQ3…A27.

2. Comprehensive Safety Monitoring

The unit integrates multiple safety functions into a single compact module: undervoltage detection, air pressure switch supervision (with functional check during startup and operation), flame supervision, and repetition limitation. The controlled intermittent operation feature triggers a mandatory safety shutdown after 24 hours of continuous running, followed by an automatic restart.

3. Precise Actuator Control

With a dedicated 12-second actuator running time, the LME22.331C2 is designed for forced draft burners requiring precise air-to-fuel ratio control via an actuator. The control sequence is managed through digital signal processing, ensuring accurate and repeatable timing.

4. Advanced Diagnostic Capabilities

The multicolor LED indicator provides clear operational and fault status messages, simplifying troubleshooting. If lockout occurs, the red signal lamp illuminates and the burner control can be reset by pressing the lockout reset button for approximately 1 second (but less than 3 seconds).

5. Wide Application Compatibility

The LME22.331C2 is type-tested and approved in accordance with DIN EN 298, and is suitable for applications governed by EN 676 (gas forced draft burners) and EN 230 (oil burners). It is designed and built for use by OEMs integrating burner controls into combustion control products.

Applications

The LME22.331C2 is deployed across a wide range of combustion control applications:

Recommended Models & Related Products

Note: The LME22 series offers various timing configurations. Always verify the specific model number against your burner's requirements, particularly the pre-purge time (t1) and actuator running time.

What's Included

• 1 × SIEMENS LME22.331C2 Gas Burner Control Unit

Note: Ionization probe, QRA flame detector, AGQ3 ancillary unit, and ignition transformer are sold separately.

Why Buy From Us?

• New and Original – Genuine Siemens product

• In Stock – Ready to ship same/next business day

• Fully Tested – Each unit verified for functionality

• Warranty Included – Purchase with confidence

• Technical Support – Burner compatibility assistance available

Frequently Asked Questions (FAQ)

Q1: What is the SIEMENS LME22.331C2?

It is a microprocessor-based gas burner control unit for the startup and supervision of 1- or 2-stage gas or gas/oil burners in intermittent operation. It supervises flame via ionization probe and controls the burner sequence including pre-purge, ignition, and safety shutdown.

Q2: What legacy models does the LME22.331C2 replace?

It replaces LGB22.330A27 and LMG22.330B27 legacy burner controls. The housing dimensions are identical for seamless retrofitting.

Q3: What ancillary unit change is required when replacing LGB/LMG with LME?

When substituting LGB or LMG burner controls with LME, the AGQ1… or AGQ2… ancillary unit must be replaced by the AGQ3…A27.

Q4: What is the safety time (TSA) of this controller?

The safety time is 3 seconds (maximum time for flame establishment).

Q5: What is the pre-purge time (t1)?

The pre-purge time is 30 seconds.

Q6: What is the actuator running time?

The actuator running time is 12 seconds.

Q7: What flame detection methods are supported?

The LME22.331C2 supports ionization probe flame supervision. It can also work with a QRA flame detector via the AGQ3 ancillary unit for forced draft burners, or a QRC blue-flame detector for blue-burning flames.

Q8: What happens after 24 hours of continuous operation?

The controller initiates a controlled shutdown followed by an automatic restart after a maximum of 24 hours of continuous operation.

Q9: How do I reset the burner control after lockout?

Press the lockout reset button for approximately 1 second (but less than 3 seconds). The control can only be reset when all contacts in the line are closed and there is no undervoltage.

Q10: What are the dimensions and weight?

The unit weighs approximately 0.16 kg (160 g). Unpackaged dimensions are approximately 62 mm (H) × 90 mm (W) × 53 mm (L).

Q11: What standards does this controller comply with?

It complies with EN 298, EN 676, and EN 230 standards.

Q12: What is the supply voltage?

The supply voltage is AC 230 V (220–240 V), 50/60 Hz.

Q13: Is this a genuine Siemens product?

Yes. This is a new and original Siemens product with model number LME22.331C2.

Q14: What should I verify before ordering?

Always verify the model number (LME22.331C2), the burner type (1-stage vs. 2-stage), the flame detection method, and the required timings (t1, TSA, actuator) against your specific application. Consult Siemens documentation or contact our technical support for assistance.