Type II — High-PressureCâu 134 / 240
A technician needs to locate a small refrigerant leak on an R-22 condensing unit. Which method is a recognized leak-detection technique?
a.Listening for a hissing sound only
b.Using an electronic leak detector, soap-bubble solution, or UV dye with a UV lamp
c.Spraying water on the coil and looking for rust
d.Measuring the outdoor temperature
Giải thích
Recognized leak-detection methods include electronic leak detectors, soap-bubble (or approved bubble) solution, and fluorescent UV dye viewed under a UV lamp; a standing pressure test with nitrogen is also used. These methods pinpoint the leak so it can be repaired. Simply listening or checking outdoor temperature will not reliably find small leaks.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A technician checks the charge on an R-22 system that uses a fixed orifice (piston) metering device. Which measurement is the primary method to verify the charge?
- A technician is checking the charge on a system equipped with a thermostatic expansion valve (TXV). Which measurement is the preferred way to verify the charge on a TXV system?
- 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 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 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 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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