York S1-025-27727-003 Control

The 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 26°F and Close at 38°F (26Op 38Cl), making it an essential evaporator coil sensor for preventing ice accumulation in cooling cycles. This switch ensures circuit integrity by breaking the electrical path when temperatures drop below the safety setpoint, protecting the compressor from liquid slugging. Built for high-cycle reliability in commercial and residential air handlers, the York S1-025-27727-003 maintains narrow differential stability to prevent short-cycling. For field technicians, this component provides a direct OEM fit, ensuring electrical compatibility with existing control boards and wiring harnesses without the need for field modifications or recalibration.

• Precise Thermal Calibration: Factory-set 26°F open and 38°F close points ensure accurate freeze protection for DX coils.
• OEM Compatibility: Genuine York replacement part ensures proper fitment and electrical ratings for S1-025-27727-003 specifications.
• Heavy-Duty SPST Logic: Reliable Single Pole Single Throw switching rated for industrial control circuits.
• Rapid Response: Low-mass sensing element provides fast reaction times to environmental temperature fluctuations.

What is the function of the York S1-025-27727-003?
This control acts as a freeze-stat or limit switch. It opens the circuit when the sensed temperature hits 26°F to prevent the evaporator coil from freezing and closes the circuit once the coil warms to 38°F.

How does the 26Op 38Cl thermal switch operate?
It is a normally closed switch in standard operating temperatures. When the temperature drops to the 26°F setpoint, the internal contacts snap open. The switch will not reset and close the circuit until the temperature rises back to 38°F.

Can I substitute a generic SPST control for York refrigeration systems?
Standard generic controls often lack the specific 26/38 differential required by York engineering standards. Using the OEM S1-025-27727-003 ensures the system operates within the designed safety parameters of the control board.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.