Functional Devices TR75VA004 Transformer The York S1-025-27792-009 is a

The York S1-025-27792-009 is a critical safety component designed for precise thermal monitoring in high-efficiency gas furnaces

Technicians generally recommend replacing the entire AS-60993-06 cluster as a single unit to ensure uniform gas flow and ignition timing across all ports

Enhanced Legibility: High-contrast dial with a color-coded metric scale minimizes reading errors for field contractors

While this is a Lennox OEM part

If your unit has a round bracket

Functional Devices TR75VA004 Transformer The York S1-025-27792-009 is aThe Functional Devices TR75VA004 is a versatile 75VA multi tap transformer designed for reliable power stepping in commercial and industrial HVACR control circuits. Featuring a universal primary input of 120 208 240 480 Vac and a 24 Vac secondary output, this unit eliminates the need to carry multiple single voltage transformers on the service truck. The integrated circuit breaker provides essential overcurrent protection, allowing for quick resets