Step | Expected Result/Action |
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15. Turn power ) off. Use the capacitor discharge too! (Figure SP-8-6) to discharge run capacitors and any other capacitors in the unit. Locate the cted to the compressor motor windings and start circuit. (Refer iring diagram.) | The wiring related to the compressor motor and its starting circuit is identified. All high-voltage capacitors used in the equipment are discharged, including the run and start capacitors. |
16. Isolate the compressor from the remainder of the circuit by disconnecting the compressor leads from all components, including the run and start capacitors and start relay. | Compressor leads disconnected from other unit wiring to measure compressor motor resistance only. |
17. Set up the VOM/DMM to measure resistance on the R x 1 ohm scale. Make sure the meter is zeroed. Measure across the three motor leads to find the two motor terminals that give the highest resistance reading as shown in Figure SP-9-19, View A. | The two wires that produce the highest reading are the run and start windings. The VOM/DMM is reading the combined (series) resistance of the run and start winding. The remaining wire is connected to the motor C (common) terminal. Mark this wire as the C terminal. Proceed to step 18 to determine other terminals through the process of elimination. |
18. Connect one lead of the VOM/DMM to the C terminal wire, identified in step 17. Touch the other meter lead to each of the remaining two compressor motor wires to find the highest resistance as shown in Figure SP-9-19, View B. | The highest resistance is the S (start) terminal of the compressor motor. The remaining terminal is the R (run) terminal. |