Schneider Electric (Viconics) R850V-8 Controller
The Schneider Electric (Viconics) R850V-8 is a professional-grade 8-stage step controller engineered for precise modulation of multi-stage HVAC systems, specifically electric duct heaters and boilers. This microcomputer-based unit utilizes an integrated vernier stage to provide seamless proportional control from 0 to 100% capacity, eliminating the large temperature swings often found in traditional on/off staging. Designed for flexible integration, it features a 24V step controller architecture with user-selectable LIFO or FIFO sequencing logic to ensuring even wear across contactors. The R850V-8 supports 0-10 Vdc pulsed or analog outputs (6 Vdc, 30mA max), making it highly compatible with modern SCR and SSR power controllers. Technicians can easily scale systems by using this HVAC step controller as a master unit slaved to another R850 controller for up to 16 stages. Reliability is maintained through an adjustable inter-stage delay and a high 10K Ohm input impedance, ensuring stable signal processing for electric heat control in high-demand commercial environments.
Key Benefits for HVACR Contractors:- Precise Modulation: The 0 to 10 Vdc vernier stage ensures the heater operates at 100% capacity resolution by modulating the first stage proportionally.
- Universal Compatibility: Dip-switch selectable analog control signals including 0-10 Vdc, 4-20 mA, and 0-135 Ohm allow interfacing with nearly any BAS or thermostat.
- Scalable 8-Stage Unit: Supports master/slave configurations to manage large-scale electric heating loads across 12 or 16 stages.
- Optimized Equipment Life: FIFO (First In, First Out) sequencing logic balances run time across all relay stages to prevent individual contactor failure.
- Rapid Troubleshooting: An integrated override test button allows field techs to bypass time delays and verify all stages instantly via status LEDs.
How do you configure the control signal for different Building Automation Systems?
The R850V-8 utilizes on-board S1-S4 dip switches to match industry-standard signals. For 0-10 Vdc systems, set the switches to the specific 2-10 Vdc range to ensure the controller correctly interprets 2V as 0% capacity and 10V as 100%.
Can this unit drive solid-state relays directly?
Yes, the pulsed 6 Vdc (30mA max) vernier output is specifically designed to drive DC-triggered SSRs, while the analog 0-10 Vdc output is compatible with SCR power controllers for fully proportional heating.
What power supply requirements should be followed for installation?
This controller requires a 24 Vac supply. For safety and code compliance, always use a Class 1 (properly fused) or Class 2 CSA/UL recognized transformer to power both the controller card and associated relay outputs.
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.
Original: $677.00
-65%$677.00
$236.95Schneider Electric (Viconics) R850V-8 Controller
The Schneider Electric (Viconics) R850V-8 is a professional-grade 8-stage step controller engineered for precise modulation of multi-stage HVAC systems, specifically electric duct heaters and boilers. This microcomputer-based unit utilizes an integrated vernier stage to provide seamless proportional control from 0 to 100% capacity, eliminating the large temperature swings often found in traditional on/off staging. Designed for flexible integration, it features a 24V step controller architecture with user-selectable LIFO or FIFO sequencing logic to ensuring even wear across contactors. The R850V-8 supports 0-10 Vdc pulsed or analog outputs (6 Vdc, 30mA max), making it highly compatible with modern SCR and SSR power controllers. Technicians can easily scale systems by using this HVAC step controller as a master unit slaved to another R850 controller for up to 16 stages. Reliability is maintained through an adjustable inter-stage delay and a high 10K Ohm input impedance, ensuring stable signal processing for electric heat control in high-demand commercial environments.
Key Benefits for HVACR Contractors:- Precise Modulation: The 0 to 10 Vdc vernier stage ensures the heater operates at 100% capacity resolution by modulating the first stage proportionally.
- Universal Compatibility: Dip-switch selectable analog control signals including 0-10 Vdc, 4-20 mA, and 0-135 Ohm allow interfacing with nearly any BAS or thermostat.
- Scalable 8-Stage Unit: Supports master/slave configurations to manage large-scale electric heating loads across 12 or 16 stages.
- Optimized Equipment Life: FIFO (First In, First Out) sequencing logic balances run time across all relay stages to prevent individual contactor failure.
- Rapid Troubleshooting: An integrated override test button allows field techs to bypass time delays and verify all stages instantly via status LEDs.
How do you configure the control signal for different Building Automation Systems?
The R850V-8 utilizes on-board S1-S4 dip switches to match industry-standard signals. For 0-10 Vdc systems, set the switches to the specific 2-10 Vdc range to ensure the controller correctly interprets 2V as 0% capacity and 10V as 100%.
Can this unit drive solid-state relays directly?
Yes, the pulsed 6 Vdc (30mA max) vernier output is specifically designed to drive DC-triggered SSRs, while the analog 0-10 Vdc output is compatible with SCR power controllers for fully proportional heating.
What power supply requirements should be followed for installation?
This controller requires a 24 Vac supply. For safety and code compliance, always use a Class 1 (properly fused) or Class 2 CSA/UL recognized transformer to power both the controller card and associated relay outputs.
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.
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Description
The Schneider Electric (Viconics) R850V-8 is a professional-grade 8-stage step controller engineered for precise modulation of multi-stage HVAC systems, specifically electric duct heaters and boilers. This microcomputer-based unit utilizes an integrated vernier stage to provide seamless proportional control from 0 to 100% capacity, eliminating the large temperature swings often found in traditional on/off staging. Designed for flexible integration, it features a 24V step controller architecture with user-selectable LIFO or FIFO sequencing logic to ensuring even wear across contactors. The R850V-8 supports 0-10 Vdc pulsed or analog outputs (6 Vdc, 30mA max), making it highly compatible with modern SCR and SSR power controllers. Technicians can easily scale systems by using this HVAC step controller as a master unit slaved to another R850 controller for up to 16 stages. Reliability is maintained through an adjustable inter-stage delay and a high 10K Ohm input impedance, ensuring stable signal processing for electric heat control in high-demand commercial environments.
Key Benefits for HVACR Contractors:- Precise Modulation: The 0 to 10 Vdc vernier stage ensures the heater operates at 100% capacity resolution by modulating the first stage proportionally.
- Universal Compatibility: Dip-switch selectable analog control signals including 0-10 Vdc, 4-20 mA, and 0-135 Ohm allow interfacing with nearly any BAS or thermostat.
- Scalable 8-Stage Unit: Supports master/slave configurations to manage large-scale electric heating loads across 12 or 16 stages.
- Optimized Equipment Life: FIFO (First In, First Out) sequencing logic balances run time across all relay stages to prevent individual contactor failure.
- Rapid Troubleshooting: An integrated override test button allows field techs to bypass time delays and verify all stages instantly via status LEDs.
How do you configure the control signal for different Building Automation Systems?
The R850V-8 utilizes on-board S1-S4 dip switches to match industry-standard signals. For 0-10 Vdc systems, set the switches to the specific 2-10 Vdc range to ensure the controller correctly interprets 2V as 0% capacity and 10V as 100%.
Can this unit drive solid-state relays directly?
Yes, the pulsed 6 Vdc (30mA max) vernier output is specifically designed to drive DC-triggered SSRs, while the analog 0-10 Vdc output is compatible with SCR power controllers for fully proportional heating.
What power supply requirements should be followed for installation?
This controller requires a 24 Vac supply. For safety and code compliance, always use a Class 1 (properly fused) or Class 2 CSA/UL recognized transformer to power both the controller card and associated relay outputs.
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.
