A technician needs to locate a small refrigerant leak on an R-22 condensing unit. Which method is a recognized leak-detection technique?

Question

Accepted Answer

Electronic detector, bubbles, or UV dye — 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.

Answer

Measuring the outdoor temperature

Answer

Spraying water on the coil and looking for rust

Answer

Listening for a hissing sound only

Answer

Electronic detector, bubbles, or UV dye

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