York S1-373-39477-002 Kit 320819-301 Key Benefits: Precise Thermal Safety:

Key Benefits: Precise Thermal Safety: Factory-calibrated to open at 140°F and auto-reset at 110°F for consistent furnace high-limit protection

Direct-acting models require the 14004139-001 or 14004140-001 kits

While designed for Nordyne

as well as floating and two-position modes

verifying the flame sensor microamp reading is essential

York S1-373-39477-002 Kit 320819-301 Key Benefits: Precise Thermal Safety:The York S1 373 39477 002 Kit is a heavy duty 3 Cell Burner Wrapper Box designed specifically for 33 inch chassis residential gas furnaces. This OEM replacement kit is engineered to contain the combustion process within the burner box assembly, providing a critical thermal barrier that minimizes heat loss and prevents contaminants from interfering with the burner flame. Rated for 60 MBH (60,000 BTU) systems, the wrapper ensures precise furnace