Lochinvar & A.O. Smith 100109935 Flue Switch 320735-701 Installing the 20170802AS often requires

Installing the 20170802AS often requires a separate high-temperature gasket or RTV silicone seal

and VP517 series

this is an auto-reset switch designed to automatically restore the electrical circuit once the sensed temperature drops back down to the 90-degree Fahrenheit reset point

Whether you are performing a seasonal furnace tune-up or an emergency gas valve manifold repair

Engineered with an 18-inch diameter and a 34-degree pitch

Lochinvar & A.O. Smith 100109935 Flue Switch 320735-701 Installing the 20170802AS often requiresMaintain the exhaust integrity and operational safety of your high efficiency heating systems with the Lochinvar & A. O. Smith 100109935 Flue Switch. As a critical safety component, this blocked flue pressure switch is engineered to detect vent obstructions and immediately signal the control board to terminate the ignition cycle, preventing hazardous flue gas recirculation. This genuine OEM part is the designated 100109935 replacement for 9004550215,