LANDIS & GYR LAL2.25 Burner Controller 220-240V

LANDIS & GYR LAL2.25 Burner Controller 220-240V 50-60Hz 3.5 VA Serie 02

The LANDIS & GYR LAL2.25 is an engineered electro-mechanical universal burner control unit designed for medium-to-large capacity forced draft gas, oil, and dual-fuel combustion systems. Operating reliably across intermittent and continuous duty cycles, this unit provides precise program sequencing, reliable flame supervision, and fail-safe interlocking for industrial steam generators, marine auxiliary boilers, and thermal oil heaters. Built with rugged internal camshaft timing and high-noise immunity circuitry, it ensures dependable operation in harsh machinery space environments.

Technical Specifications

Key Features

1. Heavy-Duty Electro-Mechanical Design: High physical immunity against severe electrical transients, voltage spikes, and electromagnetic interference (EMI) typical in marine engine rooms.
2. Precise Camshaft Sequencing: Fixed internal mechanical timing guarantees repeatable pre-purge, ignition trial, and post-purge intervals.
3. Versatile Flame Supervision: Fully compatible with photo-resistive, UV cells, and ionization detectors for diverse fuel types.
4. Integrated Air Interlocking: Prevents burner startup and initiates safety lockout if combustion air pressure switch signals fail.
5. Lockout Indication & Reset: Features a high-visibility mechanical fault indicator and manual reset button with remote reset capability.

Applications

• Marine Auxiliary and Main Steam Boilers
• Industrial Thermal Fluid and Hot Water Generators
• Heavy-Duty Air Heaters and Direct-Fired Dryers
• Rotary Kilns and Process Burners
• Dual-Fuel Commercial Heating Installations

Compatibility & Cross-References

• Compatible Equipment Models: Weishaupt, Riello, Saacke, and Hamworthy forced draft industrial burners utilizing standard Landis & Gyr / Siemens LAL sub-bases.
• Part Number Cross-References: Siemens LAL2.25, LAL2.25 Serie 02, Landis & Gyr 74.881.442-5.

Frequently Asked Questions

What is the primary difference between LAL2.25 and other LAL series controllers?

The LAL2.25 features specific pre-purge timing 22.5s and safety ignition intervals 5.0s calibrated explicitly for medium-capacity forced draft burners requiring strict air-flow verification before fuel valve opening.

Can the LAL2.25 controller be tested on a bench without a burner?

Yes, using a dedicated Landis & Gyr test board with simulated pressure switch feedback and flame current simulators, technicians can verify sequence timing and relay switching before shipboard installation.

What should I do if the unit locks out immediately during pre-purge?

Check Terminal 6 input voltage. This indicates the air pressure switch has either failed to close within the programmed timeframe or the burner fan motor contactor (Terminal 4) failed to energize.