Question 147Refrigeration & AC - Assistant Engineer

The correct answer is C) R-123. R-123 is a low-pressure refrigerant, meaning it operates at lower pressures compared to other refrigerants like R-12 and R-22. This makes R-123 safer to handle and less prone to leaks. R-123 is commonly used in low-pressure refrigeration systems, such as chillers, due to its environmental benefits and favorable thermodynamic properties. The other options, R-12 and R-22, are classified as medium-pressure refrigerants, while R-134A is a high-pressure refrigerant. These higher-pressure refrigerants are not considered low-pressure and are not the best fit for the given question.