🔍 Key Concepts

• Follow the refrigerant flow path from the compressor discharge, through the condenser/receiver, expansion devices, evaporators, and back to the compressor suction. • Recall that refrigerant is coldest immediately after expansion and in the evaporator/suction line, and warmest at compressor discharge. • Compare where valves 16, 18, 20, and 32 are located in relation to the evaporators (K and J) and the compressor (A).

💭 Think About

• Identify which of the numbered valves is located in, or closest to, the lowest-pressure, low‑temperature side of the system (evaporator/suction side). • Ask yourself for each valve: Is the refrigerant here high‑pressure liquid, condensing, evaporating, or hot discharge gas? Which of those states corresponds to the lowest temperature? • Look at how the suction lines from the evaporators join together: through which of the listed valves does that combined cold vapor pass before heading to the compressor?

✅ Before You Answer

• Verify which side of compressor A each valve (16, 18, 20, 32) is on: discharge (hot, high pressure) vs suction (cold, low pressure). • Confirm which of the listed valves is downstream of the evaporators (J and K) and still in the low‑temperature region, before any compression or heat addition occurs. • Make sure you are not choosing any valve that is clearly in the hot-gas discharge line or in the high‑pressure liquid line coming from the condenser/receiver.