Description
The Emerson Climate-White Rodgers 3L09-13 3/12″ Limit Switch is a safety control used in HVAC systems, including furnaces and packaged rooftop units, to monitor and manage high-temperature conditions. It operates through a bimetal sensing element that reacts to heat buildup by opening the circuit at 240°F and closing again at 210°F once temperatures fall to safe levels. It is mounted within the heating section or control area during equipment assembly to ensure proper system integration. In operation, it protects heat exchangers and surrounding components by preventing overheating, supporting equipment life, improving safety, and maintaining a consistent heating system.
