Cofi Ignition transformer TRK2-40HKL

The Cofi TRK2-40HKL is an electronic ignition transformer designed for gas and diesel burners, boiler equipment, and industrial heating systems. It operates from a 220–240 V, 50–60 Hz supply and provides a secondary voltage of 20 kV (2x10 kV) with a secondary current of 40 mA. The transformer has a duty cycle of 33% for 3 minutes and features a grounded center secondary. It is constructed with a horizontal plug and is energised only during the ignition period, working with the ignition electrode and burner control. The ignition cable is silicone-insulated. This model is manufactured in Italy and has the manufacturer code 309.820.044.

When selecting a replacement ignition transformer of this type, match the primary voltage, secondary voltage and current, and duty cycle to the original specifications. The mechanical interface must also be compatible: mounting bracket pattern and terminal or connector type, including whether the plug is horizontal or vertical. The high-voltage output cable must be silicone-insulated to withstand voltage and heat. Compare the manufacturer code on the existing part to ensure it matches the replacement.

Typical failures of ignition transformers include cracked or hardened high-voltage cables that leak spark to earth, which may appear as a faulty transformer. The equipment may fail to ignite or exhibit intermittent sparking. Check the cable and electrode insulator before concluding the transformer itself has failed. Other failure modes include internal short circuits or open windings, leading to no spark output.