Question 1

Which refrigerants are classified as 'high pressure' refrigerants under EPA 608?

Accepted Answer

R-22, R-410A, R-404A, R-134a, and R-502 are common high pressure refrigerants. They operate above atmospheric pressure at typical evaporator temperatures.

Question 2

What is the boiling point range that distinguishes a high pressure refrigerant from a low pressure refrigerant?

Accepted Answer

High pressure refrigerants have boiling points below 50°F (-10°C) at atmospheric pressure, meaning they must be stored and used under pressure at room temperature.

Question 3

What is the normal operating high-side pressure of R-410A at 95°F condensing temperature?

Accepted Answer

R-410A operates at approximately 400 psig on the high side at 95°F condensing temperature, which is significantly higher than R-22.

Question 4

Why is R-410A considered a higher pressure refrigerant than R-22?

Accepted Answer

R-410A is a blend of R-32 and R-125, giving it a higher saturation pressure at any given temperature compared to R-22, requiring heavier-duty system components.

Question 5

What color is the recovery cylinder used for R-410A refrigerant?

Accepted Answer

R-410A recovery cylinders are rose/pink colored, following the industry-standard color coding system for refrigerant identification.

EPA 608 High Pressure Systems

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