this unit is designed specifically for high voltage heating systems

For technicians retrofitting older pneumatic systems or maintaining existing hydronic loops

Ruggedized Construction: Built to resist moisture and temperature fluctuations common in chiller plants

or a loud rattling noise

Lochinvar & A.O. Smith 100109935 Flue Switch 322838-754 this unit is designed specificallyMaintain 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,