Final answer:
A TXV operating below its low load limit will be underfeeding refrigerant, which can result in poor system performance and potentially lead to a frozen evaporator coil.
Step-by-step explanation:
A TXV (Thermostatic Expansion Valve) that is operating below its low load limit will typically be seen as underfeeding refrigerant. This condition means that the valve is not allowing enough refrigerant to pass through to the evaporator coil. Since the TXV's purpose is to regulate the flow of refrigerant based on the system's cooling demands, when the demand is low, it reduces the flow. However, if the system is consistently operating below the TXV's designed low load limit, this can lead to poor system performance, potentially causing the evaporator coil to become too cold and eventually freeze. It is crucial for the system's efficiency and longevity that the TXV operates within its specified load limits.