What does the modutrol motor control on a rotary cup oil burner using number 6 oil?

• A. Fuel pump speed
• B. Primary air damper, secondary air damper, and oil metering valve
• C. Flame ignition and extinguishing
• D. Exhaust gas recirculation

Answer: (B)

The modutrol motor control is fundamentally designed to manage various critical components in the operation of a rotary cup oil burner, especially when using a dense fuel like number 6 oil. The correct answer highlights that the modutrol motor regulates the primary air damper, secondary air damper, and oil metering valve.

Each of these components plays a crucial role in ensuring that the combustion process runs efficiently and effectively. The primary air damper controls the flow of air that is mixed with the fuel oil prior to combustion, which is vital for achieving the optimal air-to-fuel ratio. The secondary air damper allows for the adjustment of additional air that may be needed for complete combustion, further enhancing efficiency and reducing emissions. The oil metering valve regulates the amount of fuel that is delivered to the burner, ensuring that the burner receives the necessary fuel to maintain the desired output without wastage.

By manipulating these three components, the modutrol motor can optimize combustion conditions, improve efficiency, and contribute to better overall performance of the burner system. This makes the correct answer not only relevant but essential for understanding how rotary cup oil burners function in practice.