🔍 Key Concepts

• Automatic combustion control on auxiliary boilers (what variable is it trying to maintain?) • How fuel flow and air/atomization energy are usually adjusted when steam pressure falls • What parts of the system are on the steam side versus the fuel/combustion side

💭 Think About

• Ask yourself: if steam pressure is dropping, does the system need to increase or decrease the rate of steam generation? • Which choice(s) would directly cause the burner to produce more heat in the furnace, and which affect only steam usage or downstream pressure? • Which component is normally modulated by the pressure controller to change the amount of fuel burned in an automatically fired boiler?

✅ Before You Answer

• Identify which options act on the fuel/combustion system and which act on the steam outlet side • Consider whether a back pressure regulating valve or supply steam control valve would affect how much fuel is burned in the furnace • Verify which device the pressure controller is typically connected to in a rotary cup, automatically fired auxiliary boiler