🔍 Key Concepts

• Trace the pressure transducer symbol in the diagram and note exactly where it is tapped into the system (suction side vs discharge side of the compressor). • Identify which components in the illustration are labeled as suction modulation valves and which one is the quench valve, and see what piping they are connected to. • Think about what pressure each of those valves needs to respond to in order to protect the compressor and control capacity.

💭 Think About

• From the transducer’s location, would it be exposed to low-side (suction) pressure or high-side (discharge) pressure? How does that narrow the choices? • Which control – the quench valve or the suction modulation valves – would logically need feedback from suction pressure to keep evaporators and compressor stable? • Which control would more likely need discharge pressure or temperature information to protect the compressor from overheating or to maintain head pressure?

✅ Before You Answer

• Verify on the diagram whether the pressure transducer connection is on a blue line (suction) or red line (discharge). • Confirm the labels and positions of the suction modulation valves and the quench valve in the illustration before deciding. • Make sure the chosen option matches BOTH parts: correct pressure location (suction/discharge) AND correct device being controlled (quench vs suction modulation).