On a single phase compressor, how are the terminals labeled?

In a single-phase compressor, terminals are typically labeled as S, R, and C. The S stands for "Start," which is the terminal used for the starting capacitor or for initiating the compressor’s operation. The R represents "Run," connecting to the run winding, which maintains the compressor operation during its running cycle. The C stands for "Common," serving as the return path for current in the circuit. Understanding these labels is crucial for technicians when troubleshooting or replacing components in HVAC systems, as it ensures they connect the wiring correctly for proper operation.

Other labeling systems like T1, T2, T3 are more commonly associated with three-phase systems, where multiple windings are present. The labels A, B, C might be used in some contexts but are not standard for single-phase compressors. Similarly, X, Y, Z labels do not align with the conventional single-phase compressor designation. Thus, recognizing the S, R, C labeling system is essential for effective maintenance and repair in HVAC applications.