Where is the sensing bulb located in the evaporator coil/cooling coil near the outlet?

The sensing bulb in a refrigeration system plays a crucial role in regulating the temperature and optimizing the efficiency of the cooling process. Its location near the outlet of the evaporator coil or cooling coil is specifically designed to monitor the temperature of the refrigerant as it exits the coil.

By placing the sensing bulb in this position, the system can accurately detect the temperature of the refrigerant after it has absorbed heat from the environment within the evaporator. This information is essential for determining whether the compressor needs to cycle on or off or if adjustments to the refrigerant flow are necessary. Effective temperature control at this point helps prevent issues such as overheating or inefficient cooling.

The other options do not serve this purpose effectively. For instance, placing the bulb at the compressor inlet or suction line might result in delays in temperature response and could lead to improper system operation. Such placements would not allow for timely adjustments based on the most pertinent temperature reading as the refrigerant exits the evaporator coil. Therefore, the correct placement of the sensing bulb near the outlet of the coil is vital for optimal system performance.