Cofi Ignition transformer TRE820P/8

The Cofi Ignition Transformer TRE820P/8 is a high-voltage ignition transformer designed for gas burners, diesel burners, and equipment using light or heavy liquid fuel. It operates from a 115 V supply at 60 Hz and provides an output current of 2.1 A to generate a spark for fuel ignition. The transformer has compact dimensions of 90 mm x 70 mm x 60 mm, facilitating installation in various burner configurations. It is used to step up the mains voltage to create a high-voltage pulse across the ignition electrode during the burner start-up sequence.

When selecting a replacement ignition transformer of this type, ensure the primary voltage matches the burner supply (e.g., 115 V, 230 V, or 24 V). The secondary voltage and current must be sufficient to jump the electrode gap, typically 5-10 kV and 20-30 mA, but always verify against the existing part's markings. Check the mounting type (base-plate, flange, or rail) and terminal layout for compatibility with the burner housing and wiring. The high-voltage cable connector pattern must match; if not, the cable assembly can be replaced, provided the silicone-insulated cable is not hardened or cracked. Confirm the duty cycle to ensure the transformer can handle repeated ignition attempts without overheating.

Common failure modes for ignition transformers include internal short circuits, open windings, or insulation breakdown, which can result in no spark or a weak spark at the electrode. Equipment may fail to ignite, causing the burner control to lock out after repeated attempts. Check the high-voltage cable and electrode insulation for damage, as a cracked cable can leak spark to ground and mimic a transformer fault. Also, inspect for signs of overheating or physical damage to the transformer housing.