Honeywell 113228U UV sensing tube

The Honeywell 113228U UV sensing tube is a sensor component used for flame detection in burners. Parts of this type detect ultraviolet radiation emitted by a flame, typically in oil-fired or industrial burners where ionisation detection is less reliable. The UV tube sits in the burner housing, aimed at the flame, and connects to the burner control box (flame safeguard) which processes its signal as part of the ignition and safety sequence. If the tube does not detect flame within the safety time, the control goes to lockout. When selecting a replacement UV tube, the primary parameters are the electrical connection type and the sensing tube length – they must match the existing installation to ensure correct mounting and wiring. The control box model determines the required tube voltage (low or high impedance) and sensitivity. On replacement, check the quartz window for cracks or deposits, avoid touching the window with bare fingers, and ensure the tube is properly seated and aligned with the flame zone. Failures typically show as intermittent or no flame signal, often caused by contamination or ageing of the tube element.