Description
The Siemens Combustion QPH31.090A00 Auto Reset High-Pressure Switch 5-35″ WC is a pressure-sensing control used to monitor gas or air pressure within combustion equipment. It responds when pressure reaches the specified threshold and changes its electrical contact state to signal the connected control circuit. The automatic reset feature allows the switch to return to its normal state when pressure moves back within the acceptable range. Positioned in the pressure-sensing circuit, it interfaces with tubing and electrical connections associated with the combustion controls for HVAC systems. This switching action provides pressure-based control input for regulating burner operation and responding to abnormal pressure conditions.
