Type II — High-PressureQuestion 134 of 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.Measuring the outdoor temperature
b.Spraying water on the coil and looking for rust
c.Listening for a hissing sound only
d.Electronic detector, bubbles, or UV dye
Explanation
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.
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Related questions on this topic
- 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?
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- 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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