The "/U" suffix denotes a universal professional grade packaging

reducing thermal shock to the receiver tank

Dual Switch Logic: Integrated No

specifically model XC-726SW402B

Robust flame sensing logic with 3 attempts before lockout ensures system reliability in variable conditions

Nordyne 904823 Burner Assembly 322838-752 The "/U" suffix denotes aThe Nordyne 904823 Burner Assembly is a direct replacement gas furnace burner engineered for mobile home furnace repair and residential HVAC applications. This four tube burner utilizes a 1 2" NPT steel manifold connection to deliver a consistent, high efficiency flame pattern, ensuring the reliable heat transfer required for condensing and non condensing systems. As a veteran grade OEM furnace part, the 904823 is designed to withstand thermal stress