In refrigeration wiring diagrams, how are field-wiring terminals identified?

In refrigeration wiring diagrams, field-wiring terminals are typically identified by letters. This method provides a clear and standardized way to label various connections, which is crucial for ensuring proper installation and configuration of the system. Using letters helps technicians quickly identify the purpose of each terminal (such as power, control, or communication) without confusion, as certain standardized letter designations are widely recognized in the industry.

While numbers, colors, and shapes can serve as identification methods in other contexts, they do not provide the same level of clarity and standardization specific to electrical components in refrigeration systems. Each letter designation is often consistent across manufacturers, aiding technicians in understanding wiring diagrams effectively and enhancing communication among professionals in the field.