Question 121Refrigeration & AC - 1st Asst/Chief

The correct answer is A) at the evaporator coil outlet. The thermal expansion valve (TXV) bulb is located at the evaporator coil outlet because this is the point where the refrigerant leaves the evaporator. The TXV bulb senses the temperature of the refrigerant at this point and adjusts the valve opening to maintain the proper superheat, which is critical for the efficient operation of the refrigeration system. The other options are incorrect because the TXV bulb is not located in the middle of the evaporator coils (B), at the evaporator coil inlet (C), or at the beginning of the bottom row of the evaporator coils (D). These locations would not allow the TXV bulb to accurately sense the temperature of the refrigerant leaving the evaporator.