Question 63Refrigeration & AC - 1st Asst/Chief

The correct answer is D. The vacuum pump is designed to remove refrigerant vapor from the carbon filter tank and transfer these vapors to the evaporator to minimize the loss of refrigerant to the atmosphere. This is the proper function of the vacuum pump in a centrifugal chiller high efficiency purge recovery unit, as it helps to recover and reuse the refrigerant rather than venting it to the environment. The other options are incorrect because: A) the vacuum pump is not primarily for dehydration evacuation, B) the vacuum pump does not vent non-condensable gases to the atmosphere, and C) the vacuum pump does not transfer vapors to the purge chamber to clear the float valve.