Question 43Refrigeration & AC - 1st Asst/Chief

The correct answer is D) heat the refrigerant. To perform minor repairs on a low-pressure refrigerant system without recovering the refrigerant charge, the system can be heated to raise the pressure to atmospheric levels. This causes the refrigerant to expand, increasing the pressure in the system to match the surrounding atmospheric pressure. This allows the system to be opened and repaired without releasing the refrigerant charge. The other options are incorrect because: A) pressurizing with nitrogen would not be an appropriate method for low-pressure systems, B) simply venting the system to the atmosphere would release the refrigerant, and C) fully charging the system with liquid refrigerant is not the appropriate way to raise the pressure for minor repairs.