Cofi Ignition transformer TRS820P/6

The Cofi TRS820P/6 is an ignition transformer designed for use in liquid fuel burners. It operates on a 230 V, 50 Hz supply and provides a single secondary output of 8 kV with a peak voltage of 11 kV and a secondary current of 20 mA. The transformer has a duty cycle of 25% ED within a 4-minute period and features a traditional electromagnetic construction with a grounded pole. Its epoxy-filled housing protects the windings from moisture, vibration, and overheating, while its compact dimensions (150 x 86 x 66 mm) facilitate installation in confined spaces. This model weighs 1.905 kg net and is manufactured in Italy, complying with CEI EN 61558-2-3 standards.

When selecting a replacement ignition transformer of this type, ensure the primary voltage matches the burner supply (commonly 230 V, but 110 V and 24 V variants exist). The secondary voltage and current must be compatible with the ignition electrode requirements, and the duty cycle should be sufficient for the burner's ignition sequence. Check that the mounting arrangement and terminal layout fit the existing bracket and wiring, and that the high-voltage cable connector matches the electrode connection (e.g., ø 4 mm). The transformer is energized only during the ignition period under control of the burner control, so verify the control system's compatibility.

Typical failures of this type of ignition transformer include internal winding shorts or open circuits, often caused by overheating or moisture ingress, leading to weak or no spark. A cracked or hardened high-voltage cable can leak the spark to earth, mimicking a faulty transformer. Symptoms on the equipment include failed ignition attempts, burner lockout, or intermittent operation. Check the transformer's primary voltage, secondary output, and the condition of the high-voltage cable and connections.