Sec. 4-12.5. Automatic—maximum firing rate over three to seven gallons per hour

The main flame trial-for-ignition period shall not exceed 30 seconds and the main flame shall be continually supervised while the burner is firing. The electrical circuit to the main fuel valve shall be automatically de-energized within four seconds after flame failure and the de-energized valve shall automatically close within the next five seconds. As an alternative, if intermittent ignition is employed or the ignition system is re-energized in not more than 0.8 second after flame failure, the main oil valve shall close automatically within 30 seconds after flame failure. The burner may make one attempt to relight automatically during this 30-second flame failure reaction time before the valve closes.