How does a pressurestat typically operate?

A pressurestat operates by responding to changes in system pressure. It is a crucial device used in HVAC systems to monitor the pressure of fluids or gases within a system. When the pressure fluctuates beyond predetermined thresholds, the pressurestat activates or deactivates components of the HVAC system to maintain optimal operating conditions.

For example, if the pressure in a heating or cooling system drops below a certain level, the pressurestat can trigger the system to increase pressure, ensuring efficient operation and preventing potential damage. This device is particularly vital in systems where maintaining specific pressure levels is essential for safety and performance, such as in boilers or chillers.

The other options focus on different aspects of environmental control. Monitoring temperature is typically the function of thermostats, detecting changes in humidity relates to humidistats, and measuring system airflow addresses airflow sensors, none of which pertain to the pressure regulation that a pressurestat specifically manages.