Programmable Thermostat

This replacement thermostat is designed as a direct substitute for the Resideo TH1100D1001, an obsolete non-programmable digital unit ideal for heat-only HVAC systems. The device features a backlit LCD display measuring 1.32 square inches, ensuring clear visibility and easy operation in various lighting conditions. Temperature control is maintained within plus or minus 1 degree Fahrenheit accuracy, making it suitable for precise climate management in residential and light commercial applications. The thermostat accommodates single-stage heating systems and is compatible with multiple power configurations, including 24 Vac conventional systems, heat pump systems, and 750 millivolt applications. A garage mode setting is available for extended temperature range flexibility. The standard operating range spans from 40 degrees Fahrenheit to 90 degrees Fahrenheit, with an alternative garage mode range of 35 degrees to 90 degrees Fahrenheit to suit diverse installation requirements. Electrical specifications include operation at 20 to 30 Vac or 750 mV at 50/60 Hz frequency, with heating current capability ranging from 0.02 to 1.0 amperes and cycling frequency of 2 to 6 cycles per hour. The unit offers dual power options for installation flexibility: operation via two AAA batteries included with the unit, or hardwired connection using R, C, and W terminals for permanent system integration. This replacement part is suitable for facility managers, HVAC contractors, and maintenance professionals seeking a compatible upgrade for legacy heat-only heating systems. The non-programmable design provides straightforward operation without complex scheduling features, making it an efficient choice for straightforward temperature control applications.