Cofi Ignition transformer TRS818PC

The Cofi TRS818PC is a single-pole ignition transformer designed for automatic ignition systems in gas and liquid fuel burners. It operates with a supply voltage of 230 V at 50 Hz, drawing 0.9 A, and provides a secondary voltage of 8 kV. This step-up transformer works with an ignition electrode and burner control to generate a stable spark for burner startup. The transformer is energized only during the ignition phase, as commanded by the burner control, and connects between the control and the electrode via a silicone-insulated high-voltage cable.

When selecting a replacement ignition transformer of this type, verify the primary voltage (commonly 230 V, but 110 V and 24 V variants exist), secondary voltage, current rating, duty cycle, physical mounting arrangement, terminal type, and connector pattern on the high-tension cable. Ensure the transformer's specifications match the burner control and electrode requirements. The transformer is typically mounted on a bracket or base plate, and the high-voltage cable must be routed to the electrode without sharp bends or contact with hot surfaces.

Common failure modes include internal short circuits, open windings, or insulation breakdown, leading to weak or no spark. Symptoms may include intermittent ignition, failure to ignite, or burner lockout. Check the high-voltage cable for hardening or cracks, as a damaged cable can leak spark to ground, mimicking a faulty transformer. Also inspect the electrode insulator for cracks or carbon tracking before condemning the transformer.