🔍 Key Concepts

• Discharge pressure vs. suction pressure in a refrigeration compressor • Effect of non‑condensable gases on condenser performance • How valve leaks (suction vs. discharge) change pressures and flow

💭 Think About

• Think about what happens in the condenser if there is something in the system that will not turn into liquid at condenser temperature—what must the pressure do? • If discharge valves are leaking, does that tend to increase or decrease how much pressure can be built up on the discharge side? • If liquid refrigerant is flooding back to the compressor, which side (suction or discharge) is more directly affected at first, and how would that show in pressures?

✅ Before You Answer

• Identify which condition would make the condenser less able to reject heat, forcing higher condensing/discharge pressure. • Eliminate any options that would more likely cause low discharge pressure or abnormally low capacity, rather than higher discharge pressure. • Consider which option is specifically associated with non‑condensable gases raising head pressure in marine refrigeration systems.