Question 183Refrigeration & AC - 1st Asst/Chief
70% to passWhich statement about calibrating a newly installed thermostatic expansion valve is correct?
AThis procedure is done at the factory with tools not available to a mariner.
BNo special tools are required as long as the solid state circuit control panels are functioning properly.
CThe procedure requires a refrigeration wrench and a digital thermometer to measure box temperature.
DAn accurate thermometer and suction pressure gage are essential to this process.
AI Explanation
The correct answer is D) An accurate thermometer and suction pressure gage are essential to this process. The reasoning is that properly calibrating a thermostatic expansion valve requires measuring both the temperature inside the refrigerated space and the suction pressure at the valve. This allows the technician to make adjustments to the valve until the proper superheat level is achieved, which is critical for the efficient and reliable operation of the refrigeration system. The other answer choices are incorrect because they either oversimplify the process (B and C) or state that it is done entirely at the factory (A), which is not the case for a newly installed valve that needs to be calibrated on-site.
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