1. Disconnect the power supply.
2. Remove the compartment cover, compressor terminal cover, start relay, and the wire connecting the overload protector to the common terminal.
3. Connect the appropriate test cord wires to the proper compressor terminals. (The three test wires are marked C, S, and R.)
4. Plug the test cord into a proper power supply and depress the switch for no longer than three seconds.
If the compressor never starts, or if it stops when the switch is released, it must be replaced. A good compressor will continue to run because the power is still connected to its run and common windings through the test cord. Poor connections also cause compressor failure. Be sure to check these too, prior to replacing a compressor. Tight and clean connections are essential for good current flow. If a compressor must be replaced, all the data for a duplicate replacement can be copied from the compressor nameplate to ensure getting the right one. Do not remove the nameplate! The compressor may still be under warranty; if it is, removing the
nameplate will void it.
For compressors that require capacitor(s) to operate, figure 36 illustrates a testing cord that can be easily made. (You must use fourteen gauge or heavier wire). It shows wiring to the compressor terminals (a run capacitor, a start capacitor, and a momentary-contact push-button switch). If the compressor being tested does not require a run capacitor or a start capacitor, either one may be left out of the circuit. Consequently, the test cord should be made with quick-disconnect fittings and adapters.