Type II — High-PressureCâu 136 / 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
Giải thích
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.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A technician fills a DOT recovery cylinder with recovered R-22. To prevent a dangerous hydrostatic rupture, the cylinder must not be filled beyond what fraction of its capacity?
- A technician needs to locate a small refrigerant leak on an R-22 condensing unit. Which method is a recognized leak-detection technique?
- A technician pressure-tests a repaired R-410A system for leaks before evacuating. Which gas is appropriate for pressurizing the system for a leak test?
- A technician plans to retrofit an old R-22 system to an HFC blend that uses polyolester (POE) oil. Which statement about the retrofit is correct?
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