Cofi High-voltage ignition transformer TRE820

The Cofi TRE820 is a high-voltage ignition transformer designed to generate a spark in automatic ignition systems of gas and diesel burners. It operates with a supply voltage of 230 V at 50 Hz, drawing a current of 0.9 A. The transformer provides a secondary voltage of 8 kV, configured as 2x4 kV outputs. It has dimensions of 190 mm in length, 130 mm in width, and 105 mm in height, with a net weight of 1.325 kg and a gross weight of 1.4 kg. The duty cycle is 20% on and 80% off over a one-minute period, and it is suitable for use with armoured or silicone-insulated ignition cables.

When selecting a replacement ignition transformer of this type, ensure the primary voltage (typically 230 V or 110 V, with 24 V variants for certain installations), secondary voltage and current capacity, duty cycle rating, terminal arrangement, and the connector pattern for the high-voltage cable match the existing layout. Mounting dimensions and the type of high-voltage output (e.g., recessed spring contact vs. screw terminal) must also be compatible. Always check the condition of the ignition cable, as cracked or hardened silicone insulation can cause spark leakage.

Common failure modes for ignition transformers include internal short circuits, open windings, or insulation breakdown, leading to weak or no spark at the electrodes. The burner may fail to ignite, lock out, or cycle repeatedly. Check the transformer for visible damage, measure primary and secondary voltages with appropriate safety precautions, and inspect the high-voltage cable and connections for wear or corrosion.