Which of the following does NOT occur when the load is increased on a DX evaporator using a TXV?

When the load on a direct expansion (DX) evaporator increases, several responses are triggered to manage the additional heat being absorbed. The boiling rate of the refrigerant in the evaporator increases, allowing it to absorb more heat and maintain effective cooling. As more refrigerant evaporates, the rate of vapor production, or building gas, also increases to accommodate the heightened load.

As the evaporator handles a larger heat load, the pressure in the suction line (the line drawing vapor back to the compressor) will also rise, reflecting the increased amount of vapor being generated due to the higher boiling rate.

In contrast, when the load increases, the thermostatic expansion valve (TXV) senses the rise in demand for refrigerant. It adjusts to ensure that sufficient refrigerant reaches the evaporator rather than reducing the flow. By allowing more refrigerant into the evaporator, the TXV facilitates an increase in heat absorption, thereby ensuring optimal system performance and preventing issues like overheating or flooding.

Thus, the action of the TXV in response to an increased load is to permit more liquid refrigerant to flow into the evaporator, and not to reduce the flow rate. This is why the statement regarding the TXV reducing the liquid refrigerant flow rate is