Resideo TH115-A-120S Thermostat

The Resideo TH115-A-120S is a high-performance 120V line voltage thermostat engineered specifically for technical precision in electric heating applications. Designed for seamless integration with baseboard heaters, radiant ceilings, convectors, and fan-forced heaters, this 7-day programmable thermostat ensures optimal thermal management through a tight 1-degree differential temperature control. This unit features an epoxy soundproofed relay, which eliminates the aggressive clicking common in mechanical line voltage controls, making it ideal for residential installations where silent switching is required. The vertical-mount design includes a backlit display for clear visibility in low-light environments and a remote input compatible with telephone controllers for off-site temperature adjustment. Operating within a range of 32°F to 120°F, the TH115-A-120S relies on triac switching technology to provide consistent electric heat control, reducing temperature swings and improving overall energy efficiency for your clients' HVAC systems.

Technical Benefits

• Silent Operation: The epoxy-encapsulated relay prevents acoustic feedback during cycling, essential for bedroom and living area installs.
• Precision Accuracy: Maintains a 1-degree differential to prevent significant ambient temperature fluctuations.
• Versatile Load Handling: Rated for 120 Vac, supporting up to 16.7 Amps for resistive loads and fan-forced heating equipment.
• Remote Accessibility: Built-in input allows for integration with external controllers for remote setback functionality.
• Maintenance-Free Memory: On-board programming retention ensures schedules remain intact during transient power interruptions.

Common Installation Questions

Can the TH115-A-120S be used on a 240V circuit?
No, this specific model is designed strictly for 120 Vac applications. For 240V systems, a compatible 240V variant must be selected to match the line voltage.

Is this thermostat compatible with inductive loads like cooling equipment?
This unit is specifically engineered for resistive heating loads and fan-forced heaters. It is not designed for use with air conditioning systems or heat pump compressors.

Does the TH115-A-120S require a battery for the backlit display?
The unit draws power directly from the 120V line; the backlit display and internal logic operate without the need for periodic battery replacements.

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.