The Schneider Electric (Barber Colman) THCR-4 is a reliable enthalpy control designed for use in commercial HVAC economizer and free-cooling applications. By measuring both temperature and relative humidity, this control determines the enthalpy (total heat content) of outdoor air and signals the system to take advantage of favorable conditions — reducing mechanical cooling loads and improving overall energy efficiency.
Key Features
- SPDT (Single-Pole, Double-Throw) switching action for versatile control wiring configurations
- 24V operating voltage for compatibility with standard commercial HVAC control systems
- Wide operating temperature range of 40°F to 150°F (4°C to 66°C)
- Humidity sensing range of 5% to 95% RH, non-condensing
- NEMA 1 enclosure rating for indoor, general-purpose applications
- 3 wire leads for straightforward field wiring and installation
- Barber Colman heritage — trusted performance in building automation and HVAC controls
Typical Applications
- Economizer control in rooftop units and air handling units (AHUs)
- Free-cooling changeover based on outdoor air enthalpy
- Commercial building automation and HVAC energy management systems
Specifications
- SKU: THCR-4
- Brand: Schneider Electric (Barber Colman)
- Switch Type: SPDT
- Voltage: 24V
- Operating Temperature Range: 40°F to 150°F
- Humidity Range: 5% to 95% RH, Non-Condensing
- Enclosure Rating: NEMA 1
- Wiring: 3 Wire Leads
