York S1-025-27727-003 Control requiring a technician to physically

requiring a technician to physically inspect the system before restoring operation—a vital safeguard against persistent flame rollout conditions caused by cracked heat exchangers or obstructed venting

Compatibility is strictly tied to temperature ratings

Broad Compatibility: A verified technical fit for Reznor HVAC models F-25 through F-400

Avoid mounting near coils

ensuring correct terminal alignment and mounting footprint

York S1-025-27727-003 Control requiring a technician to physicallyThe York S1 025 27727 003 is a precision engineered SPST Temperature Control designed for mission critical monitoring in York and Johnson Controls HVAC systems. This refrigeration limit switch operates as a Single Pole Single Throw contactor with specific thermal thresholds set for HVAC freeze protection. The internal logic is calibrated to Open at 26F and Close at 38F (26Op 38Cl), making it an essential evaporator coil sensor for preventing ice