🔍 Key Concepts

• Refrigerant recovery vs. charging on large centrifugal chillers • Behavior of liquid vs. vapor refrigerant in hoses and cylinders (look for sight glasses, hose position, top vs. bottom connections) • Where non‑volatile contaminants (like oil) tend to collect in a refrigerant system or storage container

💭 Think About

• Look closely at where the hoses are connected: are they at the top or bottom of the chiller and the storage vessel, and what does that usually indicate about liquid vs. vapor flow? • If you wanted to leave heavy contaminants (like oil) behind, would you more likely draw from the top or bottom of a tank, and would that be as a liquid or a vapor? • In the arrangement shown, is the refrigerant moving from the chiller to the tank, or from the tank to the chiller? That tells you whether this is a recovery or a charging operation.

✅ Before You Answer

• Verify whether the flow direction is from the chiller to the containment tank (recovery) or from the tank to the chiller (charging). • Check which phase connection is used: top connections generally indicate vapor withdrawal; bottom connections generally indicate liquid withdrawal. • Confirm whether the illustration suggests anything about contaminant separation (oil staying behind) or about increasing charging speed using liquid vs. vapor.