What is the normal compressor inlet pressure reading specifically in PSIG?

The normal compressor inlet pressure reading in PSIG is typically around 30 to 40 PSIG, depending on the specific system and its operational environment. The correct answer of 154 PSIG represents an exceptionally high pressure that is not typical for standard industrial refrigeration systems at the compressor inlet. Standard practices dictate that inlet pressures are usually much lower due to the design and function of the refrigerant cycle, where compression occurs to raise the pressure of the refrigerant vapor, allowing it to carry heat away from the refrigerated space effectively.

The other options represent more realistic inlet pressures for various configurations of refrigeration systems. However, 154 PSIG far exceeds the normal operation range and likely pertains to high-pressure systems or other phases of the refrigeration cycle, rather than serving as a standard compressor inlet pressure. Understanding the typical operational pressures of a refrigeration system helps operators monitor performance and troubleshoot issues effectively.