During operation which device listed removes air and non-condensable gases from the unit shown in the illustration? Illustration MO-0111

Correct Answer: Option A — "21"

Device 21 represents the air ejector or vacuum pump assembly. Its primary function is to continuously remove air and non-condensable gases from the condenser and shell side of the evaporator, which is essential for maintaining the vacuum required for low-temperature boiling and efficient heat transfer performance.