What is the function of a pressure switch in an HVAC system?

The function of a pressure switch in an HVAC system is to monitor refrigerant pressure. This component plays a crucial role in ensuring the safe and efficient operation of the system. When refrigerant pressure falls outside of preset thresholds, the pressure switch activates or deactivates certain system components to protect the system from damage. For example, if the pressure is too low, it may indicate a refrigerant leak or insufficient charge, prompting the system to shut down to prevent compressor damage. Similarly, if the pressure is too high, it can alert the system to issues that could lead to overheating or mechanical failure. By continuously monitoring the refrigerant pressure, the pressure switch helps maintain the system's overall health and operational efficiency.