Question 124Refrigeration & AC - 1st Asst/Chief

The correct answer is D) The control bulb is located on the evaporator coil outlet. The thermostatic expansion valve regulates the flow of refrigerant into the evaporator coil based on the temperature at the evaporator outlet. The control bulb, which contains a thermostatic fluid, is placed at the evaporator outlet to sense the temperature of the refrigerant leaving the coil. This allows the thermostatic expansion valve to adjust the refrigerant flow to maintain the proper superheat and temperature in the evaporator. The other options are incorrect because: A) The thermostat, not the thermostatic expansion valve, regulates the temperature of the refrigerated space. B) The thermostatic expansion valve regulates superheat, not the solenoid valve. C) The external equalizing pipe is connected to the suction line, not the liquid receiver.