Cofi Ignition transformer TRK2-40HD

The Cofi TRK2-40HD is an electronic high-frequency ignition transformer with center grounding, designed for low-power gas and liquid fuel burners. It operates on a 220-240 V supply at 50-60 Hz, drawing 0.3 A and consuming 65 W. The transformer provides two high-voltage outputs at 10 kV each, with an ignition current of 40 mA and a duty cycle of 33% within 3 minutes. Its compact dimensions (170 x 90 x 55 mm) and net weight of 0.33 kg allow easy installation in limited spaces. The unit features epoxy potting for protection against moisture, vibration, and overheating, and is compatible with burners from Riello, Ecoflam, FBR, Baltur, Lamborghini, Bentone, and Giersch.

When selecting a replacement ignition transformer of this type, verify that the primary voltage (e.g., 230 V) and frequency match the burner's supply, and that the secondary voltage and current are sufficient for the electrode gap. Confirm the duty cycle (e.g., 33% ED) aligns with the burner's ignition sequence, and check the mounting arrangement, terminal type, and cable connector pattern to ensure physical compatibility. The transformer is energized only during the ignition period, controlled by the burner's control box, so ensure the control signal and wiring match the new unit's specifications.

Common failures in ignition transformers of this kind include internal short circuits or open windings, often caused by overheating or moisture ingress, leading to a weak or absent spark. Symptoms include the burner failing to ignite, repeated lockouts, or a visible spark leaking to ground due to damaged ignition cables. Before replacing the transformer, inspect the silicone-insulated ignition cables for cracks or hardening, as a faulty cable can mimic transformer failure. Also check the electrode gap and condition, as improper spacing can prevent spark generation.