🔍 Key Concepts

• Trace the refrigerant flow from the evaporator outlet back to the compressor suction to locate the low‑pressure (suction) side of the system. • Understand that a low pressure cut‑out is a pressure‑actuated control switch, not just a gauge, and it is mounted on the low‑side (suction) line to protect the compressor. • Distinguish between controls on the cooling water circuit and those on the refrigerant circuit, and between high‑pressure and low‑pressure safety controls.

💭 Think About

• First, identify which line is the compressor suction line by following the evaporator outlet back toward the compressor. On that line, which labeled component (W, X, Y, or Z) looks like a pressure control rather than a simple valve or gauge? • Look at the symbols near the compressor: which labeled item is clearly associated with the low‑side pressure and not with discharge (high‑side) pressure or oil pressure? • Which of the labeled components is on the refrigerant side (not the seawater/cooling water side) and is drawn as a device that would be wired into the control circuit to stop the compressor if pressure falls too low?

✅ Before You Answer

• Confirm that the component you choose is physically located on the suction (low‑pressure) line of the compressor, not on the discharge line or water line. • Verify that the symbol for the chosen component shows a pressure‑actuated control/switch, not just a pressure gauge or manual valve. • Make sure the label you select is tied to the refrigerant circuit around compressor A, and not to the cooling‑water pressure point marked near component W.