Question 125Refrigeration & AC - Assistant Engineer

The correct answer is C) Halide torches are useful in locating very small R-22 leaks. The reasoning is that halide torches are a common tool used to detect small refrigerant leaks, including those involving R-22. When the flame of the halide torch comes into contact with R-22 gas, the flame will change color, typically turning green or blue, indicating the presence of the refrigerant. This makes halide torches effective for finding even very small leaks in an enclosed compartment. The other answer choices are incorrect: A) is incorrect as the flame turning blue is not the specific indicator for R-22; B) is incorrect as halide torches are suitable for detecting R-22 leaks; and D) is incorrect, as using the largest possible flame would not improve sensitivity and could potentially mask smaller leaks.