USCG Exam PracticeAir conditioning, ventilation, and compressed air
A refrigeration compressor trips on its high-pressure cutout. Which of the following conditions is a recognized cause of this fault?
- A. Loss of refrigerant charge
- B. A starved evaporator coil
- ✓ A fouled condenser or loss of cooling waterCorrect
- D. Liquid floodback to the compressor suction
Why C is correct
NAVEDTRA 14075 §6-2 states that the high-pressure cutout stops the compressor if discharge pressure rises dangerously, and identifies a dirty condenser, air in the system, or lost cooling water as causes. Loss of charge and a starved evaporator cause low suction pressure, tripping the low-pressure cutout instead. Liquid floodback is a slugging casualty, not a high-pressure trip.
Cited:NAVEDTRA 14075 §6-2