An excessive charge of refrigerant in a thermostatically controlled, air-cooled, refrigeration system using a TXV as an expansion device can cause which of the following?

Correct Answer: Option C — higher than normal discharge pressure

An excessive refrigerant charge floods the condenser with liquid, severely reducing the effective heat transfer surface area. This restricted cooling volume causes high side pressures to spike above normal operating limits, frequently tripping high pressure cutouts.