USCG Exam PracticeRefrigeration principles and systems
Non-condensable gas (air) that enters a refrigeration system will most likely collect in which location and produce what effect?
- A. In the evaporator, causing suction pressure to drop
- B. In the filter-drier, causing the sight glass to show bubbles
- ✓ In the top of the condenser and receiver, raising head pressure without contributing to coolingCorrect
- D. In the compressor crankcase, diluting the lubricating oil
Why C is correct
NAVEDTRA 14075 §6-3 states that non-condensable gas collects in the top of the condenser and receiver, raising head pressure without doing any cooling, and must be removed by purging. It does not settle in the evaporator or crankcase.
Cited:NAVEDTRA 14075 §6-3