Description
The Lochinvar & A.O. Smith 100288424 Pressure Switch observes a draft or combustion air pressure and opens or closes the control circuit when pressure reaches its calibrated threshold of 1.2 inches of water column, signaling the control board to permit or halt burner operation. Fitted in gas-fired boilers and condensing heating units, this part integrates directly into HVAC systems where accurate draft pressure confirmation is essential to safe burner sequencing. Consistent pressure detection through this switch prevents burner activation under inadequate draft conditions, protects against flue gas backdraft, and confirms proper inducer performance before each heating cycle begins.
