Reznor 17890 Pilot Assembly This automatic reset switch is This automatic reset switch is compatible with all non corrosive refrigerants and provides a high burst pressure rating of 3500 PSIG for maximum system integrity in food service equipment and ice machines a specific suction line drier should be selected to manage pressure drop and oil return more effectively It is designed to be used with your existing sensor or a new compatible thermocouple depending on the specific furnace model requirements The Reznor 17890 Pilot Assembly is a critical OEM replacement part engineered for precise ignition and sustained burner performance in unit heaters and furnaces