🔍 Key Concepts
• Boiler burner assemblies typically include a specific fitting that allows you to safely look at the flame without opening the furnace door.
• On an air register and burner front plate, the flame observation point is usually a small port or sight glass aimed directly into the furnace, not part of the fuel piping or air-register vanes.
• Compare the numbered items that look like valves, levers, or piping versus those that look like a window or inspection opening.
💭 Think About
• Looking at the front-plate view on the right side of the illustration, which numbered item is positioned so a person standing in front of the burner could look directly into the furnace?
• Which of the labeled items (2, 4, 10, 14) appears to be part of the fuel/air control system, and which appears to be a viewing device with a glass or clear insert?
• Would a device used to check flame color and condition need to be fitted with any kind of transparent material or protective cover? Which choice matches that appearance?
✅ Before You Answer
• Verify which item is not connected to fuel lines, atomizer controls, or air register vanes, but instead appears as a sealed opening toward the furnace.
• Confirm that the selected number is located on the burner front plate where an operator normally stands, rather than buried inside the furnace or register where it could not be used for routine flame checks.
• Check that the component’s shape suggests a sight glass or peep hole (often square or round with a glass center and retaining ring).