🔍 Key Concepts

• Follow the flow path of vapor refrigerant from the chiller service valves (1a/1b and 7) to the recovery unit and then to the storage tank. • Distinguish between valves that are on the suction side of the recovery compressor (2, 3, 5, 7) and those on the discharge/condensing/storage side (4, 6, 8, 9, 10). • Remember that during vapor recovery using the compressor, you want refrigerant to pass through the compressor, condenser, and into the storage tank, while keeping any liquid‑level or drain paths closed.

💭 Think About

• Trace on the illustration how vapor leaves the chiller, enters the recovery unit suction, is compressed, condensed, and then enters the storage tank. Which valves must be open for that complete path, and which would create a bypass or dead end? • Look at which valves are associated with liquid drains or vents (such as the storage tank vent and low‑point drains). During normal vapor recovery, would you want these open or closed? • Compare each answer choice to see which one gives you a continuous path from the chiller to the tank through the oil separator and condenser, not around them. Which options clearly bypass key components?

✅ Before You Answer

• Verify that all valves needed for a continuous suction path from the chiller to the compressor inlet are open in your selected choice. • Verify that all valves needed on the discharge side (compressor discharge → condenser → storage tank) are open, and that paths back to the chiller or out the vent are closed. • Double‑check that no choice has you opening a valve that would isolate the storage tank, short‑circuit the compressor, or open the storage tank vent (9) during normal recovery.