🔍 Key Concepts

• Thermal expansion valve (TXV) controls refrigerant flow based on superheat • The sensing bulb must accurately feel the temperature of refrigerant leaving the evaporator • Difference between inlet vs. outlet of the evaporator, and liquid vs. suction lines

💭 Think About

• Where in the system do you need to measure temperature so the valve can prevent liquid refrigerant from returning to the compressor? • Which location would give the most accurate reading of the refrigerant condition (superheated vapor vs. liquid) coming out of the evaporator? • Look at each choice and ask: Is this on the line carrying suction gas leaving the evaporator, or is it on the high‑pressure liquid side?

✅ Before You Answer

• Identify which option is on the suction line rather than the liquid line • Confirm which side of the evaporator (inlet or outlet) best represents the refrigerant condition returning to the compressor • Eliminate any locations that are clearly on the high‑pressure liquid line rather than the low‑pressure suction line