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this HVAC high-limit switch is essential for resolving lockout conditions caused by overheating
It is purpose-built to maintain the atmospheric pressure reference required for proper diaphragm operation while shielding the vent orifice from blockage caused by freezing rain
Built with a brass body and reinforced diaphragms
Common Questions Is the B1756013HRDF compatible with my older system
Lennox 79L57 Orifice 320788-702 this HVAC high-limit switch isThe Lennox 79L57 is a critical Natural Gas Burner Orifice engineered specifically for high efficiency Lennox gas furnaces and heating units. This genuine OEM replacement part is precision machined to deliver an exact BTU output by regulating the volumetric flow of natural gas to the burner assembly. Using a Lennox 79L57 Orifice ensures your manifold pressure aligns with factory specifications, preventing issues like incomplete combustion, soot
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