or the burner failing to ignite due to the control circuit not closing

Integarl Mounting Flange or Strap and Bracket for Duct Mounting

this transmitter is strictly designed for non-corrosive inert gases and dry air

and normally closed (NC) terminals to ensure the circuit closes upon a temperature rise for cooling stages

ensuring bolt-hole alignment and flow capacity

Lennox 56W21 Limit Switch 318820-201 or the burner failing toThe Lennox 56W21 Limit Switch is a critical safety component designed for precise thermal monitoring in high efficiency furnaces and air handlers. This L160 30F limit switch is engineered to open the electrical circuit at 160F on a temperature rise and feature an automatic reset once the plenum cools to 130F. As a veteran grade HVAC replacement part, it is a direct match for the Lennox 46105 002 and is compatible with a wide array of Allied Air brands