Cofi Ignition transformer TRS820PISO

The Cofi TRS820PISO is an ignition transformer designed for gas and liquid fuel burners, including those in small to medium power applications. It operates on a 115 V supply at 50 Hz, delivering a secondary voltage of 8 kV with a secondary current of 20 mA. The transformer features a traditional electromagnetic construction with an isolated pole, providing a peak voltage of 11 kV and a duty cycle of 33% ED within 3 minutes. Its dimensions are 140 mm in length, 86 mm in width, and 66 mm in height, with a net weight of 1.827 kg. The unit is certified to CEI EN 61558-2-3 and originates from Italy.

When selecting a replacement ignition transformer of this type, verify that the primary voltage, secondary voltage, and current ratings match the original part and the burner control requirements. Ensure the duty cycle is compatible with the burner's ignition sequence. Check the physical mounting dimensions and the connector type for the high-voltage cable, which is typically a standard ø 4 mm. The transformer must be electrically and mechanically interchangeable with the existing unit.

Common failure modes for ignition transformers include internal short circuits, open windings, or insulation breakdown, which can result in weak or no spark at the electrode. The burner may fail to ignite, lockout, or cycle repeatedly. Before condemning the transformer, inspect the high-voltage cables for hardening or cracks, as these can leak spark to earth and mimic a faulty transformer.