York S1-THEC11P5S Thermostat

The York S1-THEC11P5S Thermostat is a professional-grade 7-day programmable thermostat engineered for single-stage heat and cool (1H/1C) applications. Specifically optimized for heat pump systems without auxiliary heat, this unit ensures precise setpoint management and HVAC energy efficiency. As a direct replacement for model THEC11P5S, it features auto/manual system switching and dual power options (24VAC hardwired or battery-powered) to accommodate varied field requirements. The logic includes adjustable temperature swing (differential) for tighter cycle control, and the terminal bank provides clear designations for C, RH, Y, W, G, RC, and O/B, streamlining installation in residential and light commercial settings.

Key Contractor Benefits:

• Universal Heat Pump Compatibility: Optimized for 1H/1C heat pump configurations requiring O or B changeover valves.
• Flexible Scheduling: Features a 7-day programmable interface with up to 4 periods per day to reduce equipment runtime when spaces are unoccupied.
• Robust Terminal Designations: Standardized C, RH, Y, W, G, RC, O/B terminals ensure compatibility with most 24V control circuits.
• Precision Calibration: Integrated digital temperature control provides accurate sensing to maintain consistent occupant comfort.
• Compact Footprint: The white finish housing measures 5.85" x 3.67" x 1.15", making it a clean retrofit for older, larger footprints.

Common Technical Questions:

Does this unit support multi-stage heat pump systems?
No, the York S1-THEC11P5S is designed specifically for single-stage heating and cooling. It does not provide terminals for auxiliary or emergency heat (W2/EM).

Is a common wire required for operation?
While a C-wire is recommended for continuous backlight and reliable power, this programmable thermostat can operate as a battery-powered unit in retrofits where a common wire is unavailable.

Can I use this for a conventional furnace and AC system?
Yes, this unit is versatile and supports conventional 1H/1C systems as well as heat pump applications by configuring the system switches during installation.

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.