Type II — High-PressureQuestion 136 of 240
A technician notices R-410A gauge pressures running much higher than an equivalent R-22 system at the same conditions. What does this reflect about R-410A?
a.R-410A is a low-pressure refrigerant
b.The gauges are miscalibrated for R-410A
c.R-410A operates at significantly higher pressures than R-22, so higher-rated gauges and components are required
d.R-410A must be charged as a vapor to lower pressure
Explanation
R-410A operates at roughly 50 to 70 percent higher pressures than R-22 at the same temperatures, which is normal for that refrigerant. Because of this, R-410A systems require gauges, hoses, and components rated for the higher pressures. R-410A is a high-pressure refrigerant, and using R-22-rated tools on it can be unsafe.
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