Question 94Refrigeration & AC - QMED

The correct answer is C) Bring the part of the system to be opened to 0 psig. This is the correct answer because, when performing non-major repairs on a refrigeration system, it is essential to ensure the system is fully depressurized before opening any part of it. Bringing the part to be opened to 0 psig (pounds per square inch gauge) pressure ensures there is no residual pressure in the system, which could otherwise cause a rapid and dangerous release of refrigerant when the system is opened. The other options are incorrect because: A) Bringing the system to ambient pressure may still leave some residual pressure, B) Using the hot gas defrost line does not depressurize the system, and D) Setting the high-pressure cutout on manual does not depressurize the system either.