Question 62Refrigeration & AC - 1st Asst/Chief

The correct answer is B) When recovering refrigerant from the centrifugal chiller using this method, it minimizes the risk of chiller tube freeze-up. The arrangement of equipment and associated hoses shown in the illustration is designed to safely recover refrigerant from a centrifugal chiller. The key benefit of this method is that it helps prevent the chiller tubes from freezing up during the recovery process, which can damage the equipment. This is achieved by maintaining a proper flow and pressure balance within the system. The other options are incorrect because: A) Further recovery may still be required to meet regulatory limits, C) The vent hose should remain open to allow the refrigerant to be properly recovered, and D) Exceeding 90% of the drum's capacity could lead to overfilling and potential safety issues.