Lennox 12J77 Limit 318423-701 Built around the Baso Q90FF-1

Built around the Baso Q90FF-1 specification

Built with a rugged steel shell construction

protecting the windings from thermal overload

and 581B models

Professional Grade Construction: Built with high-temperature resistant alloys to withstand constant thermal stress within the combustion chamber

Lennox 12J77 Limit 318423-701 Built around the Baso Q90FF-1The Lennox 12J77 Limit Switch is a critical safety component designed for precise temperature regulation in Lennox heating systems. Engineered as a Single Pole Single Throw (SPST) device, this fixed temperature limit control ensures operational safety by monitoring internal plenum temperatures. The switch features a 60F opening point and a 35F closing point, providing an narrow differential necessary for preventing equipment overheating or cycling