USCG Exam PracticeRefrigeration and air conditioning
Non-condensable gas that has leaked into a refrigeration system will most likely collect in which location, and what is the operational consequence?
- A. In the evaporator coil, causing frost buildup and reduced airflow
- B. In the compressor crankcase, causing oil dilution and bearing damage
- ✓ At the top of the condenser and receiver, raising head pressure without contributing to coolingCorrect
- D. At the metering device orifice, causing freeze-up and loss of refrigerant flow
Why C 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 must be removed by purging. Freeze-up at the metering device is caused by moisture, not non-condensable gas.
Cited:NAVEDTRA 14075 §6-3