USCG Exam PracticeRefrigeration cycle and components
Non-condensable gas (air) that has leaked into a refrigeration system will most likely accumulate where, and what is the primary symptom?
- A. In the evaporator coil, causing low suction pressure and frost buildup
- B. In the filter-drier, causing a restriction and bubbles in the sight glass
- ✓ In the top of the condenser and receiver, causing elevated head pressureCorrect
- D. In the compressor crankcase, causing low oil pressure and bearing damage
Why C is correct
Non-condensable gas collects in the top of the condenser and receiver, raising head pressure without contributing to cooling. It is removed by purging. Low suction pressure and frost are symptoms of undercharge or restriction, not air in the system.