Protectorelay® oil burner control operates oil burner and oil valve (if desired) in response to call for heat from low-voltage control circuit. Ignition is on whenever the burner is on (intermittent ignition, also called constant ignition). Solid state flame sensing circuit. External button to manually reset safety switch after lockout. Enclosed safety switch must be manually reset after safety shutdown. R8184M includes 40-volt-ampere transformer and Y and G terminals for connection of cooling equipment. Mounts on standard 4 X 4-inch junction box. C554A cadmium sulfide flame detector and 24-volt (AC) thermostat required.