The compressor fan motor and capacitor work together in an air conditioning systems condensing unit the wires feeding high voltage electricity to the condensing unit connect to a contactors line voltage terminal and the air conditioning systems low voltage signal wires connect to the contactors coil. While wiring a compressor there are a number of things to consider for a proper electrical hook up a main concern is the amperage requirements of the compressor this dictates the size of the wires another factor is if the compressor is single phase or three phase power this dictates the configuration of the wiring. Precaution identify the air compressor circuit turn it off and tag it with a note before working with the 220 volt air compressor wiring circuit wiring for a 240 volt air compressor circuit size for an air compressor the circuit size will depend on the size of the air compressor and the horsepower rating of the motor
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