Compressor capacitor wiring - how to hook up an electric motor start or run capacitor this article gives electric motor start run capacitor installation wiring instructions for electric motor capacitors designed to start run an electric motor such as an ac pressor heat pump pressor or a fan motor and how to wire up a hard starting air conditioner pressor a motor capacitor such as a start capacitor or run capacitor including a dual run capacitor is an electrical capacitor that alters the current to one or more windings of a single phase ac induction motor to create a rotating mag ic field defective pressor overload which will cause the lube oil control to time out and shut the system down if you are testing out your new boost capacitor be sure you allow several minutes between startups of your a c this ensures that pressures within the a c system equalize and the pressor motor will start much easier this means that whenever.

the pressor pump stops there will be some air trapped in the cylinder over the piston might be just a little might be a lot but some air will be there and that air will add load to the motor when the motor tries to start and move the piston