Lennox 74W77 Limit Switch L155°F-30°F

The Lennox 74W77 Limit Switch is a safety component for Lennox HVAC equipment usually furnaces or the air handlers. This automatic switch is a secret protector in your system since it controls temperature to guarantee safe use. The 74W77 is a fixed operational point device and is intended for use in the temperature range of 30°F to 155°F. If the temperature goes high the switch turns off the power supply to the furnace or air handler to protect your equipment and to avoid getting burned by excessive heat. When the temperature returns to the safe operating range, the 74W77 resets itself and your system may continue to run without your having to do anything.