Watch out: not all electric motors, such as pool pumps, use starting or run capacitors.įor example a split-phase motor, often used in spas and hot tubs and at many above-ground swimming pools, uses a start switch and starts winding but does not use a starting nor a run capacitor.Ī "permanent split capacitor" motor uses a run capacitor but not a starting capacitor. See LOCATE the STARTING CAPACITOR, Some motors don't use capacitors or use only a run capacitor Dual capacitorĪ dual capacitor - combines two physical capacitors inside of a single physical device, one to run a higher-amperage motor such as the compressor in an air conditioner compressor/condenser unit, and a second smaller capacitor to run a smaller motor such as the cooling fan motor in the compressor/condenser unit. It will have both S and R as well as a C terminal. You can tell this by examining the terminals marked on the capacitor. So if your electric motor has only one physical capacitor, it might be a model that combines both start and run features. These caps will have three electrical terminals: Combined start/run capacitorĪ start/run capacitor combines the start capacitor and run capacitor functions in a single device. Individual Start & Run CapacitorsĪ start capacitor is used to give the motor a kick to get it moving and a separate run capacitor keeps it spinning smoothly. Types of Motor Capacitorsīefore trying to replace a capacitor, you should know that some motors use a combined start/run capacitor and others don't use a start or run capacitor at all. The higher a capacitance or ♟, the greater the total voltage charge that will be accumulated and then released by the capacitor to give the motor a "kick" to start it rotating. HOW TO LOCATE the MOTOR CAPACITOR - separate articleĬapacitance is the ability of a device to store an electrical charge.Īn electric motor capacitor is a device that first stores, then releases an electrical charge to help start an electrical motor (starting capacitor) or to keep it spinning (run capacitor) - the electrical charge or potential energy stored in the capacitor is used to give a power boost to the motor to help it overcome inertia - to start rotating.CAPACITOR CODE & MARKING DECODING GUIDE.EXPLAIN CAPACITOR WORKING CLASS & LIFE EXPECTANCY. ![]()
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