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Answer :
Final Answer:
The correct orientation of the sensing bulb for a thermal expansion valve on a horizontal run is with the pinched off tubing up and the capillary tube down to ensure accurate temperature sensing and prevent liquid accumulation. Thus the correct option is b) The bulb should be attached so that the pinched off tubing is oriented up and the capillary tube running to the valve diaphragm is oriented down.
Explanation:
In a thermal expansion valve system, proper orientation of the sensing bulb is crucial for accurate control of refrigerant flow. Option b) is correct because positioning the bulb with the pinched off tubing up ensures that any condensed liquid remains in the bulb, improving its sensitivity to temperature changes. Additionally, having the capillary tube running downward allows for proper drainage of any condensed liquid, preventing it from affecting the valve's operation.
Incorrect orientations, such as those described in options a), c), or d), can lead to issues such as poor control of superheat, which affects the efficiency and performance of the refrigeration system. Ensuring the correct orientation of the sensing bulb is essential during installation to optimize the system's performance and reliability.
Proper installation also involves securing the bulb tightly to the evaporator tail coil to ensure good thermal contact and accurate temperature sensing. Additionally, care should be taken to avoid kinking or damaging the capillary tube during installation, as this can lead to restrictions in refrigerant flow and system malfunction.
Overall, following manufacturer guidelines and best practices for installation ensures optimal performance and longevity of the thermal expansion valve system. Thus the correct option is b) The bulb should be attached so that the pinched off tubing is oriented up and the capillary tube running to the valve diaphragm is oriented down.
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