Lochinvar & A.O. Smith 100109973 Switch 319847-401 and PDP series heaters

and PDP series heaters

such as flame signal loss or rollout switch trips

this kit is compatible with standard 1

If the switch opens before the 220°F threshold or remains open after the unit has cooled significantly

Simple Integration: Features 7/16" UNS threads and self-aligning ferrules for 1/4" OD rigid tubing connections

Lochinvar & A.O. Smith 100109973 Switch 319847-401 and PDP series heatersThe 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