Lennox 10M64 Limit Switch 321894-709 If the timer does not

If the timer does not advance when power is applied

maintaining system static pressure and airflow efficiency

always ensure the system is properly evacuated and the filter drier is replaced

preventing carbon monoxide leakage into the mechanical room and ensuring your exhaust venting system remains compliant with local mechanical codes and manufacturer specifications for clearance and airflow efficiency

For cooling applications where the valve must open as temperature decreases

Lennox 10M64 Limit Switch 321894-709 If the timer does notThe Lennox 10M64 Limit Switch is a critical HVAC safety control designed to prevent heat exchanger damage by monitoring discharge air temperatures. This L190 40F limit switch features a fixed set point, opening the circuit at 190 degrees Fahrenheit and automatically resetting when the temperature drops to 150 degrees Fahrenheit. Engineered for high reliability applications, this SPDT limit control (Single Pole Double Throw) ensures precise thermal