If airflow is optimal but the switch still opens below 190

ranging from -40°F to 180°F

Using an LP orifice with Natural Gas will result in an insufficient flame

and RRNA-A series equipment

Rheem-Ruud AS-60993-06 Burner Cluster If airflow is optimal butThe Rheem Ruud AS 60993 06 Burner Cluster is a critical OEM replacement component engineered for high efficiency gas furnaces and packaged units. As a veteran grade furnace burner assembly, this multi port cluster is designed to ensure precise fuel to air ratios, facilitating stable combustion and preventing delayed ignition issues common in aging Rheem HVAC heating systems. Constructed from high grade metal alloys, this direct fit furnace part