Lochinvar & A.O. Smith 100112430 Blocked Inlet Switch

The Lochinvar & A.O. Smith 100112430 Blocked Inlet Switch detects restricted combustion airflow and interrupts equipment operation when intake blockage or inadequate air movement is present. Its pressure-sensitive switching mechanism reacts to inlet airflow changes and signals the control system when unsafe operating conditions occur within HVAC systems such as condensing boilers, gas-fired water heaters, and hydronic heating units. This switch is mounted near the combustion air intake or blower section and connected to the safety control circuit for continuous airflow verification. Its protective response assists with combustion safety and reduces overheating risk.