Under what conditions is a multiple try ignition system allowed before a permanent lockout occurs?

A multiple try ignition system is designed to attempt ignition multiple times before a permanent lockout happens, which is a safety feature to prevent unsafe conditions, such as gas accumulation. The key requirement for allowing a multiple try ignition system is that there must be no opportunity for gas pockets to build up, which can occur if the ignition fails repeatedly without the immediate evacuation of unburned gas.

In conditions where gas pockets can form, repeated ignition attempts can lead to potentially hazardous situations. Therefore, the system is engineered to avoid these circumstances to ensure safety. In contrast, scenarios such as low gas pressure, maintenance activities, or initial system startup do not inherently prevent the risk of gas accumulation and may compromise the safety aspect that the multiple try ignition system seeks to address. Recognizing this principle is crucial for ensuring the safety and effectiveness of gas-fired equipment in commercial settings.