Cofi High-voltage ignition transformer TRG1020C

The Cofi TRG1020C is a high-voltage ignition transformer designed to generate a spark in automatic ignition systems for gas and liquid fuel burners. It operates with a supply voltage of 230 V at 50 Hz, drawing 1 A, and provides two high-voltage outputs of 5 kV each at a frequency of 2 kHz. The transformer is compact, measuring 110 x 90 x 70 mm, with a net weight of 2.725 kg. It is energised only during the ignition period, as controlled by the burner control box, ensuring stable and safe equipment startup.

When selecting a replacement ignition transformer of this type, ensure the primary voltage matches the burner control supply (commonly 230 V, but 110 V or 24 V variants exist). The secondary voltage and current must be compatible with the electrode gap and burner design. Check the duty cycle, as some burners require longer ignition periods. Verify that mounting dimensions, terminal layout, and cable connector pattern fit the existing bracket and wiring. The high-voltage ignition cable should be silicone-insulated; inspect it for hardening or cracks before installation.

Typical failures of ignition transformers include internal short circuits, open windings, or insulation breakdown, leading to weak or no spark. The burner may fail to ignite, causing the control box to lock out after repeated attempts. Check for visible damage, overheating, or a cracked high-voltage cable that can leak spark to ground. Measure primary and secondary voltages with a multimeter to confirm the transformer is functioning within specifications.