When mounting a TEV sensor bulb, which of the following is NOT true?

When mounting a thermostatic expansion valve (TEV) sensor bulb, the statement that it should be warmer than the evaporator inlet is not true. In fact, the sensor bulb is designed to measure the temperature of the refrigerant that leaves the evaporator, which is typically cooler than the refrigerant entering the evaporator. By being cooler than the evaporator inlet, it ensures that the sensor can accurately control the flow of refrigerant, regulating the temperature and maintaining optimal performance.

Understanding the correct positioning is critical for effective operation. The sensor bulb must also be mounted lower than the valve body to allow for proper gravitational effects and to ensure adequate liquid refrigerant returns to the evaporator. Additionally, insulating the sensor bulb is essential to prevent outside thermal influences from affecting its readings, which could lead to inefficient system performance. Consequently, the requirement for the sensor bulb to be warmer than the evaporator inlet contradicts the fundamental principles of how the TEV operates.