Which direction should the TXV adjustment screw be turned to decrease superheat?

To decrease superheat in a system equipped with a Thermal Expansion Valve (TXV), the adjustment screw should be turned counterclockwise. The TXV is designed to regulate the flow of refrigerant into the evaporator based on the temperature of the vapor leaving the evaporator. Superheat refers to the amount of heat added to the refrigerant vapor above its saturation temperature at a given pressure.

When the adjustment screw is turned counterclockwise, it typically allows the TXV to open more, increasing the refrigerant flow into the evaporator. This results in more refrigerant being vaporized and, subsequently, a reduction in the superheat of the vapor because the refrigerant is less likely to be in a superheated state upon exiting the evaporator. Therefore, properly adjusting the TXV in this manner is crucial for optimizing the performance and efficiency of the refrigeration system.