In what scenario would the compressor inlet temperature be considered abnormal?

The scenario in which the compressor inlet temperature exceeds the standard operating range is considered abnormal because it can lead to various operational issues. Compressors are designed to operate within specific temperature ranges for optimal performance and efficiency. When the inlet temperature is too high, it can result in reduced efficiency, increased wear on the compressor components, and potential failure due to overheating.

An inlet temperature that is outside the acceptable range may indicate underlying problems in the system, such as insufficient cooling, refrigerant issues, or mechanical malfunctions. This scenario requires immediate attention to avoid further complications and to ensure the compressor operates safely and effectively.

While the other options present conditions related to temperature, they do not directly indicate abnormal performance to the degree that exceeding the standard operating range does. For example, an inlet temperature below 0°F can be normal for certain applications, while equal inlet and discharge temperatures might indicate a problem but does not always signify an abnormal condition. A constant temperature could reflect a stable operational state and is not inherently an indication of abnormality.