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.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
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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