What is the function of a fuel oil ignition transformer?

A fuel oil ignition transformer is a high voltage step up transformer used in oil fired burners to create a strong spark across electrodes. It converts line voltage to a high secondary voltage that can jump an air gap and ignite the fuel oil spray. Reliable ignition requires correct secondary voltage, current capability, duty cycle, and proper grounding. Maintenance focuses on clean electrodes, correct gap, sound insulation, and verifying output under safe test conditions.