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 fills the condenser internal volume with liquid, blanketing effective heat transfer surface area. This reduction in condensing capacity causes high condensing temperatures and directly results in higher than normal high-side discharge pressure.