Description
The Schneider Electric (Barber Colman) R851V-8 is a professional-grade, 8-stage step controller featuring an integrated Vernier stage for smooth, precise capacity staging in commercial HVAC and building automation applications. Designed for demanding control environments, this unit delivers reliable multi-stage sequencing with analog Vernier modulation to minimize equipment wear and optimize system efficiency.
Key Features
- 8-stage step controller with integrated Vernier stage for fine-tuned capacity control
- 24V operating voltage for compatibility with standard commercial HVAC control circuits
- Vernier stage output: 0 to 10 Vdc at 5 mA for smooth analog modulation
- Pulsed DC output: 6 Vdc, 30 mA maximum for reliable stage switching
- Input signal: 0 to 10 Vdc at 5 mA maximum for broad system compatibility
- Input impedance: 0 to 10 Vdc into 10K Ohm for accurate signal reception
- Integrated Vernier stage eliminates the need for a separate modulating controller
- Ideal for chiller, boiler, and multi-stage HVAC equipment sequencing
Specifications
- SKU: R851V-8
- Brand: Schneider Electric (Barber Colman)
- Number of Stages: 8
- Supply Voltage: 24V
- Vernier Stage Output: 0 to 10 Vdc, 5 mA
- Pulsed Output: 6 Vdc, 30 mA Max
- Input Signal: 0 to 10 Vdc, 5 mA Max
- Input Impedance: 10K Ohm (0 to 10 Vdc)
Applications
- Commercial HVAC multi-stage equipment sequencing
- Chiller and boiler plant staging control
- Building automation systems requiring staged capacity management
- Air handling units with multiple heating or cooling stages
The R851V-8 is a trusted solution for HVAC professionals and building automation engineers who require precise, multi-stage control with the added benefit of integrated Vernier modulation — all in a single, compact controller.
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