This is another method that can be used to try to break loose a locked rotor in a single-phase compressor.
■ Make sure the start and run capacitors have high enough ac voltage rating for the new applied voltage.
■ Remove wiring from the compressor motor terminals. Double the line voltage hook-up as in Fig. 3-14.
■ Make sure the power is off while you are doing the second step.
■ If the compressor is 120 volts ac, make the line one to number two 240 volts ac. If the compressor is rated at 240 volts ac, single-phase, make line one to number two 480 volts ac, single-phase.
■ Attach a jumper from run to capacitor and a second jumper from start to capacitor.
■ Take the jumper wire off the start terminal of the compressor.
■ Turn on the higher voltage.
■ Take the jumper wire and tap it about four times (one second each, to the start terminal). Do not touch the live voltage. Be careful and hold the insulation of the jumper wire.
■ Turn off the power, then repeat the above procedure in five minutes.