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Standard Dimensions: Features a standard 3-inch insertion depth for compatibility with most Carrier-branded primary limit mounting brackets
the 42-100491-09 is the manufacturer-designated superceded part number
Constant dripping often indicates thermal expansion issues rather than a valve defect
Improved Flame Sensing: Enhanced metallurgy in the sensing probe reduces resistance issues that cause intermittent pilot outages
this steel adapter provides a reliable
Lochinvar & A.O. Smith 100135269 Burner 320788-704 Standard Dimensions: Features a standardThe Lochinvar & A. O. Smith 100135269 Burner is a precision engineered 100% OEM replacement for high efficiency condensing boilers, specifically designed for WH285 and WH399 models. As a critical component in the combustion assembly, this burner ensures an optimal air to fuel ratio, supporting the high turndown ratios found in the Lochinvar Knight and A. O. Smith boiler series. Built to industrial grade standards, the assembly is compatible with both