Which symptom would indicate an oil-logged condenser?

Which symptom would indicate an oil-logged condenser?

• A. Low discharge pressure
• B. High discharge line pressure and low liquid line pressure
• C. High suction pressure
• D. High liquid line pressure

Answer: (B)

Oil in the condenser coats the tubes and inhibits heat transfer, so the refrigerant isn’t condensed effectively. When condensation is poor, the high-side (discharge) pressure rises because the condenser can’t reject heat efficiently. That makes the discharge line pressure high. At the same time, the condenser isn’t delivering as much liquid to the liquid line, and flow becomes restricted, so the liquid line pressure can drop relative to normal. The result is a pattern of high discharge (high-side) pressure with relatively low liquid-line pressure, which matches this symptom.

Oil in the condenser coats the tubes and inhibits heat transfer, so the refrigerant isn’t condensed effectively. When condensation is poor, the high-side (discharge) pressure rises because the condenser can’t reject heat efficiently. That makes the discharge line pressure high. At the same time, the condenser isn’t delivering as much liquid to the liquid line, and flow becomes restricted, so the liquid line pressure can drop relative to normal. The result is a pattern of high discharge (high-side) pressure with relatively low liquid-line pressure, which matches this symptom.