Lennox 73K21 Auto Limit Switch 145°F-175°F

The Lennox 73K21 is an Auto Limit Switch, an essential safety tool for the heating or cooling systems. This automatic switch works as an invisible security guard in the HVAC system by controlling temperature. It is designed for a specific temperature, 145°F to 175°F. If the temperature goes high switch off the power supply to the system to avoid damaging equipment and to avoid overheating or excessive cooling for the safety of the user. It is essential in preventing overheating and contributes to the general reliability of the HVAC system. Once the temperature returns to the safe operating range, the automatically resets to enable the system to continue running without the need for human interjection.