ESCO Air Conditioning Practice Exam 2026 – Complete Study Resource

Question: 1 / 400

The flow rate of a TXV used in R-410A systems compared to R-22 systems is approximately:

10% greater

The flow rate of a TXV in R-410A systems is approximately 10% greater than in R-22 systems. This is because R-410A is a blended refrigerant that has a higher operating pressure and a higher mass flow rate compared to R-22. This higher mass flow rate requires the TXV to be able to handle a greater amount of refrigerant. Options B, C, and D are incorrect because they suggest that the flow rate in R-410A systems is even greater than 10%, which is not the case. Option B is the closest but still an overestimation. Option A is the most accurate and is supported by industry standards and research. Therefore, Option A is the correct answer.

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15% greater

20% greater

25% greater

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