Description
The Schneider Electric (Barber Colman) THC-3 is a precision enthalpy control designed for economizer and free-cooling applications in commercial HVAC systems. By continuously monitoring both temperature and humidity conditions, this controller determines the enthalpy (total heat content) of outdoor air, enabling the system to make intelligent decisions about when to use outside air for economizing — helping reduce energy consumption and operating costs.
Key Features
- SPDT (Single-Pole, Double-Throw) switching action for reliable control output
- 24V operating voltage for compatibility with standard commercial HVAC control circuits
- Wide operating temperature range: 40°F to 150°F (4°C to 66°C)
- Humidity sensing range: 5% to 95% RH, non-condensing
- NEMA 1 enclosure rating for indoor installation protection
- Three 1/4″ male quick-connect terminals for fast, secure field wiring
- Barber Colman heritage — trusted in commercial building automation for decades
Specifications
- SKU: THC-3
- Brand: Schneider Electric (Barber Colman)
- Control Type: Enthalpy Control
- Switch Type: SPDT
- Voltage: 24V
- Operating Temperature: 40°F to 150°F
- Humidity Range: 5% to 95% RH, Non-Condensing
- Enclosure Rating: NEMA 1
- Terminals: Three 1/4″ Male Quick Connects
Applications
- Economizer control in rooftop units and air handling units
- Free-cooling strategies in commercial HVAC systems
- Building automation and energy management systems
- Outdoor air quality and enthalpy-based changeover control
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