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.HOW TO CHOOSE A CAPACITOR FROM MOTOR DATA - 4 ways.DIAGNOSIS: DOES MY MOTOR NEED A NEW CAPACITOR?.TABLES of COMMON MOTOR SIZE & CAPACITOR VALUES - shown above/left.Making a mistake can cause a fire or serious injury or death. Watch out: do not attempt electrical repairs if you are not trained and equipped to do so. How to Diagnose, Choose, & Replace Motor Capacitors We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. We also explain the choice & wiring procedures for a hard start capacitor designed to get a hard-starting air conditioner compressor motor, fan motor, refrigerator, or freezer compressor or other electric motor (such as a well pump) going. These electric motors use a capacitor to start and run the motor efficiently. This electric motor capacitor article series explains the selection, installation, testing, & use of electric motor starter start and run capacitors used on various electric motors found in or at buildings such as air conditioner compressors, fan motors, some well pumps and some heating equipment. This article explains how to select an electric motor start capacitor, hard start capacitor, or run capacitor that is properly rated for and matches the requirements of the electric motor such as an AC compressor motor or fan motor where the capacitor is to be installed. We have no relationship with advertisers, products, or services discussed at this website.Įlectric motor start-run capacitor selection guide: InspectAPedia tolerates no conflicts of interest.
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