Description
The Schneider Electric (Barber Colman) R850V-8 is a professional-grade, 8-stage step controller featuring an integrated Vernier stage for smooth, precise capacity modulation in commercial HVAC systems. Designed for demanding building automation and control applications, this unit delivers reliable sequential staging of heating, cooling, or process loads while the built-in Vernier stage provides fine-tuned analog output between discrete steps — eliminating the abrupt transitions common with conventional step controllers.
Key Features
- 8 discrete output stages with integrated Vernier stage for seamless capacity control
- 24V operating voltage for compatibility with standard commercial control systems
- Vernier stage output: Pulsed 6 Vdc at 30 mA maximum
- Accepts 0 to 10 Vdc control signal at 5 mA maximum
- Input impedance: 0 to 10 Vdc into 10K Ohm
- Designed for commercial HVAC, building automation, and process control applications
- Manufactured by Schneider Electric (formerly Barber Colman)
Electrical Specifications
- Supply Voltage: 24V
- Control Input: 0 to 10 Vdc, 5 mA Max
- Input Impedance: 10K Ohm (0–10 Vdc)
- Vernier Stage Output: Pulsed 6 Vdc, 30 mA Max
- Number of Stages: 8
Applications
- Multi-stage heating and cooling systems
- Commercial HVAC capacity staging
- Building automation and energy management systems
- Process control requiring sequential load switching with analog trim
The R850V-8 is the ideal solution for engineers and controls contractors who need reliable, multi-stage sequencing with the added precision of an integrated Vernier output — all in a single, compact controller from one of the industry’s most trusted names in building controls.
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