Question 188Refrigeration/AC - 1st Asst/Chief70% to pass
Of the various possible methods shown in the illustration, which is the correct method of attaching a TXV feeler bulb to a large line (7/8" and larger) with a horizontal run? Illustration GS-RA-50
AI Explanation
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.
Related Questions
#186 Which of the listed statements describes the method used to determine the amount of superheat present in the suction gas leaving the evaporator coil? Illustration GS-RA-16 #187 The coil temperature measured at the expansion valve sensing bulb of an operating system is 10°F. The low side pressure with the compressor running as shown on the gauge illustrated indicates 15 psig. What adjustments or changes, if any, should be made to the system? Illustration GS-RA-16 #189 Expansion valve maintenance should include which of the following procedures? #190 A thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the evaporator superheat setting will result in which of the following? #191 When replacing a thermostatic expansion valve power element, what is true concerning the thermal bulb?