What is the key difference between R-22 and R-410A refrigerants?

Prepare for the Master Mechanical License Test with flashcards and multiple-choice questions. Each question includes hints and detailed explanations. Get confident for your exam!

The key difference between R-22 and R-410A refrigerants is that R-410A operates at higher pressures than R-22. This characteristic is significant because it affects the design and performance of HVAC systems that use these refrigerants. R-410A's higher pressure allows for better energy efficiency and improved heat transfer properties, making it a preferred choice in modern air conditioning systems.

Understanding the pressure difference is crucial for technicians when they are working on HVAC equipment, as it influences the selection of components like compressors and evaporators, which must be rated for the specific refrigerant's operating pressures. Additionally, R-410A's higher pressures can contribute to a more efficient system operation, which aligns with current regulations aimed at improving energy efficiency and reducing greenhouse gas emissions.

While the other options touch on characteristics of these refrigerants, they do not accurately capture this critical difference. R-22 is being phased out due to its ozone-depleting properties, making R-410A a more environmentally friendly option, but it operates under different design pressures, which is a fundamental aspect of selecting the appropriate refrigerant for HVAC applications.

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