Lennox 21L89 Auto Limit Switch 3" Insert 210°F-240°F

The Lennox 21L89 Auto Limit Switch is an intended safeguard of HVAC equipment. It is designed as a normally closed, 3" insert limit switch. That means it holds the circuit closed until certain condition is achieved in this case, increase in temperature. The designed to turn off the system when the system’s temperature range between 210F and 240F in order to prevent overheating or damaging your HVAC equipment. By controlling and stabilizing temperature and preventing your system from short-cycling the Auto Limit prolongs the use of ventilation and adds to the durability of your HVAC unit. the Lennox 21L89 itself is quite small in physical size but offers significant benefits to the functioning of your HVAC system.