ESCO Air Conditioning Practice Exam 2026 - Free AC Certification Practice Questions and Study Guide

The primary function of a TXV (Thermostatic Expansion Valve) is to regulate the flow of refrigerant within the HVAC system. It plays a crucial role in controlling the amount of refrigerant that enters the evaporator coil based on the demand for cooling. By adjusting the flow of refrigerant, the TXV ensures that the evaporator operates efficiently, allowing for optimal heat exchange between the refrigerant and the indoor air.

When the air conditioning system requires more cooling, the TXV opens to allow more refrigerant to enter the evaporator. Conversely, when less cooling is needed, the valve closes to reduce the flow. This capability helps maintain the desired temperature and enhances the overall efficiency of the system. The regulation of refrigerant flow by the TXV is essential to prevent issues like flooding or starvations of the evaporator coil, which can lead to system inefficiencies and potential damage.

Other functions, such as compressing or evaporating refrigerant, are performed by different components within the HVAC system, specifically the compressor and evaporator, respectively. Monitoring temperature involves various sensors but is not a direct function of the TXV itself. Understanding the specific role of the TXV clarifies its importance in maintaining optimal performance in an air conditioning system