The Cleveland Controls AFS-442 is a professional-grade air pressure sensing switch designed for critical monitoring in HVAC and energy management systems

When servicing specialized boiler sight glass assemblies

The unit features automatic thermal overload protection to prevent winding failure and utilizes a 1/2-inch flatted shaft on both ends to accommodate dual-blower wheel configurations

including the M9000 and MP8000 series

Lochinvar & A.O. Smith 100208242 On/Off Switch 323055-751 The Cleveland Controls AFS-442 isThe Lochinvar & A. O. Smith 100208242 On Off Switch is a critical OEM replacement power switch engineered for high efficiency hydronic and water heating systems. As a veteran grade HVAC control component, this rocker style switch features a clearly defined "I O" symbol for definitive status verification during boiler troubleshooting and routine HVAC maintenance. Designed for 120V circuits, it serves as the primary manual disconnect on the control