🔍 Key Concepts

• Pumped-down system: where the refrigerant is stored when the suction valve is closed and the compressor pumps the system down • Function of the receiver, condenser, and evaporator in a typical marine refrigeration system • Where liquid vs. vapor refrigerant tends to collect in normal operation and during pump-down

💭 Think About

• When you pump a system down, which component is designed specifically to store liquid refrigerant safely? • In normal running conditions, which components usually contain mostly liquid, and which contain mostly vapor? How does that change (or not) during pump-down? • Think about the flow path: compressor → condenser → (receiver?) → expansion device → evaporator → compressor. During pump-down, where is the refrigerant being driven and held?

✅ Before You Answer

• Verify which component’s main purpose is liquid storage, not heat exchange • Confirm where the service valves are typically closed during a pump-down procedure and what that forces the refrigerant to do • Eliminate options that are primarily heat exchangers rather than storage vessels