How does a flow switch operate in HVAC applications?

In HVAC applications, a flow switch operates by utilizing flow detection mechanisms to monitor the movement of liquids or gases through a system. When fluid flow is detected, the flow switch activates, either opening or closing electrical contacts based on the presence or absence of flow.

This function is critical for ensuring that HVAC systems operate safely and efficiently. For instance, if water is not flowing in a cooling system, a flow switch can trigger an alarm or shut down equipment to prevent damage. This automatic response to flow conditions enhances system reliability and protects equipment longevity.

Other options, such as manually opening and closing valves, involve human intervention and do not leverage the automatic capabilities of flow switches. Measuring ambient temperature is unrelated to flow detection, and filtering fluid contaminants pertains to filtration systems rather than flow monitoring. Thus, the operation of a flow switch through flow detection to control electrical contacts is fundamental in maintaining the effectiveness of HVAC operations.