What factor increases the average operating pressures of R-410A compared to R-22?

The factor that increases the average operating pressures of R-410A compared to R-22 is indeed higher average operating pressures. R-410A is designed to operate at higher pressures than R-22 due to its thermodynamic properties, specifically its higher saturation pressure at a given temperature. This is a result of the chemical makeup of R-410A, which consists of a mixture of two hydrofluorocarbons (HFCs) that allows it to operate more efficiently at these elevated pressures.

In practical scenarios, this means that systems using R-410A typically require components, such as compressors and heat exchangers, that are specifically designed to handle these higher pressures. This elevated operating pressure contributes to R-410A's efficiency in heat transfer and ultimately improves the overall performance of the HVAC systems it's used in, compared to those utilizing R-22.