Riello Motor Capacitor 4.5uF RDB CAPACITOR-45UF-SMALL-SPADE--THREADED-RDB

The Riello RDB 4.5uF motor capacitor is a run capacitor used on Riello RDB oil burners. It supplies the phase shift the burner motor needs to start and then run smoothly, so a failed capacitor usually shows up as a motor that hums, stalls or refuses to spin up.

This capacitor is the EOGB equivalent for RDB burners that use a 4.5uF capacitor. It is supplied complete with its cap and has two small spade terminals, and it mounts to the burner on a threaded stud secured with a nut.

• The burner motor hums but does not turn over, and the burner locks out.
• The motor is slow or erratic to start, particularly from cold.
• The capacitor body is swollen, split or weeping electrolyte.
• The burner runs intermittently, cutting out shortly after start-up.
• Repeated lockouts that clear after the motor is helped to spin.

• Check the capacitance printed on the existing capacitor and match it to 4.5uF.
• Confirm the terminal arrangement is two small spades and that the mounting is a threaded stud with a nut.
• Note the burner model and any serial or build details so the correct RDB variant is identified.
• If the burner has not been serviced recently, check the motor and pump at the same time as the capacitor.