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mineral buildup around the discharge port
and PDP series heaters
If the switch opens before the 220°F threshold or remains open after the unit has cooled significantly
such as flame signal loss or rollout switch trips
the 803112802 ensures the HVACR system safety and compliance with rigorous industrial standards
Lochinvar & A.O. Smith 100109973 Switch 319847-401 mineral buildup around the dischargeThe Lochinvar & A. O. Smith 100109973 Blocked Inlet Switch is a critical safety component designed for high efficiency condensing boilers and water heaters. As a normally closed air pressure switch, its primary function is to monitor the intake system for airflow restrictions. If the intake air connection screen becomes clogged or the vent piping is obstructed, the switch detects a fall in pressure and opens the electrical circuit, instantly shutting