Which refrigerant is known for having a blend of difluoromethane, pentafluoroethane, and Tetrafluoroethane?

• A. R22
• B. R407C
• C. R410A
• D. R134a

Answer: (B)

The refrigerant that is composed of a blend of difluoromethane (R32), pentafluoroethane (R125), and tetrafluoroethane (R134a) is R407C. This refrigerant blend is designed to provide a low environmental impact, contributing to reduced global warming potential compared to traditional refrigerants. R407C is widely used in air conditioning systems and some heat pump applications due to its properties that closely match those of R22, making it a suitable drop-in replacement for systems originally designed to use R22.

R22, on the other hand, is a single-component refrigerant that has been phased out in many regions due to its high ozone depletion potential. R410A, while also a blend, is made up of different chemicals and has a higher efficiency but is not the same as R407C. R134a is another single-component refrigerant, commonly used for refrigeration and air conditioning, but it does not contain the blend of components found in R407C. Thus, R407C is the correct answer, as it encapsulates the specific blend mentioned in the question.