What device controls automatic recycling on an oil burning appliance?

• A. Thermostat
• B. Draft regulator
• C. Aquastat
• D. Primary Control

Answer: (D)

In an oil-fired burner, the device that manages automatic recycling is the primary control. This control module acts as the burner’s brain: it handles ignition, monitors flame presence with a flame sensor, and sequences the burner on and off. If ignition fails or the flame goes out, the primary control initiates a short recycle cycle—a brief pause followed by another ignition attempt—until it lights or reaches a safe lockout. The thermostat merely signals heat demand, the draft regulator keeps the exhaust draft within safe limits, and the aquastat controls boiler water temperature; none of these manage the burner’s internal cycling or safety interlocks.