On a direct spark ignition control, what is the trial for ignition?

In a direct spark ignition control system, the trial for ignition typically lasts for a duration of 4 seconds. This time frame is set to ensure that the burner can achieve proper ignition after the spark is initiated. During this 4-second period, the control system attempts to ignite the fuel-air mixture. If ignition occurs, the system proceeds to operate normally. If ignition does not take place within this time, the system will safely lock out to prevent potential hazards, such as gas accumulation.

Understanding the significance of the trial for ignition is crucial in maintaining the safety and efficiency of gas-fired appliances. The duration of this trial is based on safety standards that aim to minimize risks while allowing the appliance adequate time to achieve ignition under various conditions.