Lennox 27K79 Limit Critical Sizing: Accurately machined to

Critical Sizing: Accurately machined to a #29 drill size for industrial-grade reliability

for high-pressure steam over 150 PSI

saving time during routine service calls

Corrosion-Resistant Brass: Constructed from high-stability brass to withstand constant exposure to system water and high temperatures

Standardized Board Mounting: The 1

Lennox 27K79 Limit Critical Sizing: Accurately machined toThe Lennox 27K79 175F Limit is a critical safety component designed for precise thermal regulation within the furnace plenum. As a primary high limit control, this genuine OEM replacement part is engineered to interrupt the electrical circuit to the gas valve if internal temperatures exceed the 175F threshold, effectively preventing heat exchanger damage and ensuring system safety. This furnace high limit switch features an automatic reset mechanism