Question 47Refrigeration & AC - Assistant Engineer

The correct answer is B) heat the refrigerant. Heating the refrigerant in a low-pressure system will cause the pressure to rise to atmospheric pressure, allowing minor repairs to be performed without the need to recover the refrigerant charge. This is in accordance with regulations that permit this approach to avoid the time and expense of recovering small amounts of refrigerant for minor maintenance. The other options are incorrect because: A) pressurizing with nitrogen would not raise the refrigerant pressure, C) simply opening the system would result in the release of refrigerant, and D) completely filling the system with liquid refrigerant would not achieve the necessary pressure increase for minor repairs.