Cofi Ignition transformer TRK2-35

The Cofi Ignition transformer TRK2-35 is a high-voltage ignition transformer used in burner ignition circuits. It operates on a supply voltage of 220–240 V at 50–60 Hz, providing a secondary voltage of 12 kV and a secondary current of 35 mA. The transformer features a plug-in power connector (Satronic) and is equipped with silicone-insulated ignition cable. It is energized only during the ignition period, as controlled by the burner control system. The type designation is 537D8107, and the manufacturer code is TRK2-35.

When selecting a replacement ignition transformer of this type, ensure the primary voltage matches the burner control supply (commonly 230 V, but 110 V and 24 V are also used). The secondary voltage and current must be adequate for the electrode gap and combustion conditions. Verify that the mounting and terminal types, as well as the cable connector pattern, match the original fastening and wiring layout. The duty cycle (typically a few seconds per start) must suit the burner's operating sequence.

Typical failures include a hardened or cracked high-voltage cable, which can divert the spark to earth, mimicking a transformer failure. Other issues may involve internal short circuits or open windings, leading to no spark or weak spark at the ignition electrode. Check the ignition cable for damage and measure the secondary voltage with a suitable high-voltage probe to confirm operation.