The York S1-025-29041-001 Limit Switch is a critical OEM safety component engineered for precise thermal monitoring in high-efficiency furnace and air handling units

This DSI control is not position-sensitive

and AD1094C amplifiers

providing the consistent negative pressure required to close vacuum-actuated pressure switches

this is a Relay in a Box unit

Williams P025600 Burner 324846-701 The York S1-025-29041-001 Limit SwitchWhen servicing Williams Forsaire Magnum Top Vent furnaces, the Williams P025600 Burner is the specific cast iron replacement required to restore proper combustion performance. This OEM replacement burner is engineered for high heat durability and precise flame patterns in natural gas configurations for the Forsaire 250, 350, and 500 series models. As a veteran grade furnace burner assembly, it ensures optimal thermal transfer and steady manifold