USCG Exam PracticeRefrigeration and air conditioning
Non-condensable gas that has leaked into a refrigeration system will most likely collect where, and what is its primary effect on system operation?
- A. In the evaporator, causing suction pressure to drop below the low-pressure cutout setpoint
- ✓ In the top of the condenser and receiver, raising head pressure without contributing to coolingCorrect
- C. In the crankcase, contaminating the compressor oil and reducing lubrication
- D. At the metering device orifice, restricting refrigerant flow to the evaporator
Why B is correct
NAVEDTRA 14075 §6-3 states that non-condensable gas (air) that leaks into the system collects in the top of the condenser and receiver, raising head pressure without doing any cooling, and is removed by purging.
Cited:NAVEDTRA 14075 §6-3