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Please check first the compressor for something like working. If it only vibrates, you notice a high temperature in it. If this hapens, just replace the capacitor of the compressor... a white tube with 2 wires in one side and a possoble screw on the other (tipical values for europe is 400VAC in USA 200VAC and capacities from 4 to 20uF.
If the compressor it´s running, and you notice one of the pipes slightly cooler than the other, well, then you need to load gas and a help from a pro with proper equipment!
To size a potential relay you must read the Start winding voltage (the BEMF) which will be above the supplied line voltage, in this example I use 300 volts for math. BEMF = 300 volts, 300v x ,50 = 150v minimum 300v x .80 = 240v maximum 300v x 1.20 = 360v continuous So you want the Start capacitor to stay in the circuit to at least 150v BEMF or risk stalling, and you do not want the Star capacitor to stay in beyond 240v BEMF or risk exploding the Start capacitor. The 120% continuous rating is to oversize the coil in the potential relay that remains in the system to protect it . If you have a compressor that is not running you will need to jump it with a Start capacitor(a large one) to the run capacitor for 1 second or so to bump start the compressor, then you can read the Start winding for the BEMF reading.