Questions: What should be done before transferring refrigerant to an empty cylinder? A. The refrigerant should be chilled. B. The refrigerant should be mixed. C. The cylinder should be heated. D. The cylinder should be evacuated.

The answer is D: The cylinder should be evacuated.

Explanation for each option:

A. The refrigerant should be chilled.

• Incorrect. Chilling the refrigerant is not a necessary step before transferring it to an empty cylinder. The focus should be on preparing the cylinder itself.

B. The refrigerant should be mixed.

• Incorrect. Mixing the refrigerant is not a standard procedure before transferring it to a cylinder. The refrigerant should remain pure and uncontaminated.

C. The cylinder should be heated.

• Incorrect. Heating the cylinder is not a recommended practice before transferring refrigerant. It could potentially create unsafe conditions.

D. The cylinder should be evacuated.

• Correct. Evacuating the cylinder means removing any air or moisture from it, which is essential to prevent contamination of the refrigerant and ensure safe and efficient transfer.

In summary, before transferring refrigerant to an empty cylinder, the cylinder should be evacuated to ensure it is free of air and moisture.