Fail-safe operation: The spring return open configuration ensures airflow is not restricted during power failures

Exceeding the PMO can prevent the float from opening the valve against internal pressure

The Watts 0067452

The valve is factory-set but can be adjusted using the square head adjusting screw

uneven cooling across circuits

Lochinvar & A.O. Smith 100233338 Burner 320788-704 Fail-safe operation: The spring returnThe Lochinvar & A. O. Smith 100233338 Burner is a critical combustion component engineered for high efficiency gas fired boilers and water heaters. As a direct OEM replacement burner for the obsolete Lochinvar BNR2902, this part is designed to maintain precise atmospheric or pre mix combustion across various residential and commercial heating systems. Constructed from premium grade materials to withstand high thermal stress, it ensures stable flame