Description
The Weil McLain 571-624-407 Pressure Switch is a combustion control component used in boiler elements to monitor air or gas pressure levels within the combustion circuit. It is calibrated to operate at 3.25 inches of water column and opens or closes the electrical control circuit based on condition measured pressure meets the required operating threshold of HVAC systems. It is placed in boilers, where it works as a vital interlock for the ignition and combustion system, preventing burner operation under airflow or pressure conditions caused by blocked passages.
