What is the difference between the 7728 and 7686 kits

75 inches) before installation

protecting sensitive low-voltage sensors and microprocessor-based boards from premature failure due to power fluctuations

making it compatible with various electrical setups found in modern air handlers

this component resists the thermal stresses and heavy mechanical loads found in high-cycle furnace and air handler environments

Lochinvar & A.O. Smith 100111657 Burner Assembly 322027-701 What is the difference betweenThe Lochinvar & A. O. Smith 100111657 Natural Burner Assembly is a precision engineered replacement component designed for high efficiency commercial and residential water heating systems. As the direct updated version for 9006990005, this assembly features a #30 ORF (orifice) specifically calibrated for natural gas combustion. Veteran technicians recognize this part as a critical OEM replacement burner for maintaining the narrow manifold pressure and