Question 126Refrigeration & AC - QMED

The correct answer is B) heat the refrigerant. Heating the refrigerant in a low-pressure system will cause the pressure to rise to atmospheric levels, allowing minor repairs to be performed without the need to recover the refrigerant charge. This is because as the temperature of the refrigerant increases, the pressure also rises, eventually reaching atmospheric pressure. The other options are incorrect because: A) opening the system vent would simply release the refrigerant to the atmosphere, which is not allowed; C) pressurizing the system with nitrogen would introduce a foreign gas, which is also not permitted; and D) filling the system with liquid refrigerant would not raise the pressure to atmospheric levels.