Lennox 78W99 Limit Switch 319847-401 These flat sealing gaskets are

These flat sealing gaskets are engineered for a precise fit at 1-1/2" joints

Manual Reset Safety: High-limit lockout requires a technician's inspection before system restart

Precise Superheat Control: Regulates refrigerant flow to protect the compressor and optimize coil surface utilization

maintaining stable operation and protecting expensive downstream components like fan motors and compressors from premature wear

High Flow Capacity: The 1/2" NPT threading ensures consistent gas flow for medium-to-high BTU appliances

Lennox 78W99 Limit Switch 319847-401 These flat sealing gaskets areThe Lennox 78W99 Limit Switch is a critical safety component engineered to regulate heat exchanger temperatures within Lennox G40, G41, G50, G51, and G61 gas furnaces. This L235 30F thermal limit control features a fixed temperature setting, designed to open the electrical circuit at 235F and automatically reset once temperatures drop by a 30F differential. Precision calibrated for high limit protection, this SPST (Single Pole Single Throw) switch