Cofi Ignition transformer TRE820/9

The Cofi TRE820/9 is a single-pole ignition transformer designed for gas and dual-fuel burners. It operates on a 230 V supply at 50 Hz and produces a secondary voltage of 8 kV. The transformer measures 90 mm in length, 70 mm in width, and 60 mm in height, with a compact housing suitable for limited spaces. It is compatible with burners from Riello, Ecoflam, and CIB Unigas, and works with the ignition electrode and burner control to generate a spark for ignition. This model is manufactured in Italy and has the article number 309.820.026.

When selecting a replacement ignition transformer of this type, verify the primary voltage (e.g., 230 V), secondary voltage (e.g., 8 kV), and frequency (50 Hz) match the burner's requirements. Check the mounting dimensions and terminal arrangement to ensure compatibility with the existing bracket and wiring. The ignition cable must be silicone-insulated and have the correct connector pattern to fit the transformer and electrode. Measure the physical size (length, width, height) to confirm it fits in the available space.

Common failures include no spark or weak ignition, often caused by internal breakdown or short circuits. The burner may fail to ignite or repeatedly lock out. Check the ignition cable for cracks or hardening, as this can leak the spark to ground. Inspect the electrode gap and condition, as a worn electrode can mimic transformer failure.