Question 112Refrigeration/AC - Assistant Engineer70% to pass
Which of the installation steps listed is necessary for the proper operation of the thermostatic expansion valve?
AI Explanation
The correct answer is C) Clean off oxidation from the surface of the suction line and sensing bulb with fine abrasive cloth or steel wool.
This is the correct answer because proper installation of a thermostatic expansion valve requires ensuring good thermal contact between the sensing bulb and the suction line. Any oxidation or corrosion on the surfaces can insulate the bulb and prevent it from accurately sensing the refrigerant temperature, which is crucial for the valve to function correctly.
The other options are incorrect because they do not address the need to ensure proper thermal contact. Attaching the bulb with plastic ties (A) or adding insulation (B) does not clean the surfaces. Removing excess capillary tube (D) may affect the sensitivity, but does not ensure good thermal contact.
Related Questions
#110 In a dry-type direct expansion refrigeration evaporator, what is true concerning the evaporator coils? #111 If the evaporator coil horizontal return line of a container refrigeration system is less than 0.875" #113 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 #114 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 #115 Expansion valve maintenance should include which of the following procedures?