🔍 Key Concepts

• Look at the pressure control switches around the compressor labeled A and note which lines (suction vs. discharge) they are connected to. • Recall that a high-pressure cut-out must sense pressure on the discharge (high side) of the compressor, upstream of the condenser. • Compare the symbols for the different safety controls (low-pressure, oil pressure, and high-pressure) and how they are piped into the system.

💭 Think About

• Trace the refrigerant flow from the compressor A toward the condenser B: which lettered control (W, X, Y, or Z) is connected to this high‑pressure side? • Which of the lettered components is arranged so that, if discharge pressure rises too high, it would stop or protect the compressor? • Which controls are more likely related to cooling water flow or oil pressure, and therefore not the high‑pressure cut‑out?

✅ Before You Answer

• Verify which side of the system each lettered device senses: suction side vs. discharge side of the compressor. • Confirm that the candidate component is a pressure-actuated safety control, not a temperature or flow device. • Make sure the selected letter is on a line that will always see the maximum system pressure during normal operation (compressor discharge before pressure‑reducing devices).