Question 188Refrigeration & AC - 1st Asst/Chief

The correct answer is C. The illustration GS-RA-50 shows the proper method for attaching a TXV feeler bulb to a large line (7/8" and larger) with a horizontal run. Option C depicts the correct technique, which involves securing the feeler bulb to the side of the horizontal line using a clamp or strap. This ensures proper heat transfer from the line to the feeler bulb, allowing the thermostatic expansion valve (TXV) to accurately sense the refrigerant temperature and adjust the flow accordingly. The other options, A, B, and D, depict less suitable methods that may not provide sufficient contact between the feeler bulb and the refrigerant line, potentially leading to inaccurate temperature sensing and improper TXV operation.