York S1-026-34726-001 Limit Switch technicians often use high-temp silicone

technicians often use high-temp silicone RTV on cut surfaces or seams as specified in Lochinvar service manuals

providing an exact physical and electrical match for the original York limit switch

the 221729A is for units without a display

For technicians working with legacy systems

For technicians working on 9-inch or 12-inch units

York S1-026-34726-001 Limit Switch technicians often use high-temp siliconeThe York S1 026 34726 001 Limit Switch is a critical safety component designed for precise thermal regulation within York, Luxaire, and Coleman HVAC systems. This SPST (Single Pole Single Throw) fixed temperature switch operates on a 110 140F automatic reset cycle, meaning it breaks the electrical circuit if the plenum temperature exceeds 140F and restores continuity once it drops to 110F. As a direct replacement for S1 2702 314P A, this OEM component