Question 120Refrigeration & AC - 1st Asst/Chief

The correct answer is A: the bulb should be attached so that the pinched off tubing should be oriented down and the capillary tube running to the valve diaphragm should be oriented up. This is the correct orientation because it ensures that any condensation or refrigerant in the sensing bulb will drain back into the evaporator, maintaining the proper thermal contact and allowing the valve to accurately sense the evaporator temperature and regulate the flow of refrigerant accordingly. Orienting the bulb in this way prevents liquid from accumulating in the bulb, which could lead to improper valve operation. The other options are incorrect because they do not provide the optimal orientation for proper valve functioning. Orienting the bulb and tubing randomly (option B) or in the opposite direction (options C and D) could allow liquid to accumulate in the bulb, compromising the valve's ability to accurately sense and respond to evaporator conditions.