WebCTRL® System – PlantCTRL chiller plant control solution

plant ctrl

Key Features

  • An integrated component of the WebCTRL® System, the PlantCTRL chiller plant control solution responds to the building load by automatically starting, staging and stopping the plant, resetting the chilled water supply temperature, and matching the tonnage produced to the tonnage required by the building.
  • Proven, reliable, factory-engineered and supported control algorithms for plant management are designed to reduce engineering and commissioning labor.
  • Supports 20 I/O points on the controller, up to (6) MEx I/O expansion modules in panel configuration or remote mounted up to 100 ft away for scalable solutions (164 I/O points total).
  • Supports advanced algorithms, optimizations, diagnostics, and analytics add-ons.
  • Native BACnet communications to field devices over TCP/ IP, Ethernet, high-speed ARCNET 156 Kbps or BACnet MS/TP networks.
  • Supports optional flow meter inputs for tonnage calculations.
  • Graphically programmed with self-documenting control sequences and a live view of all sequence components.
  • Universal inputs and outputs, with HOA override switches and potentiometer adjustment available on all outputs.
  • Supports full integration with variable speed pumps and other products via BACnet, Modbus®, or LonWorks® protocols.

Optimization Benefits

In addition to basic plant automation sequences, the PlantCTRL solution offers specific sequences that can lower plant energy consumption, reduce equipment “wear and tear”, and ultimately increase occupant comfort.

Several of these options are described here:

Plant Scheduling – Allows plant start/stop according to user defined scheduling or with scheduling plus OA conditions.

Benefit: Reduces unnecessary plant run time; therefore reducing plant operating cost.

Optimized Chiller Staging – Multiple user selectable staging strategies available to automatically vary the number of running chillers to deliver the precise plant capacity required by the building load.

Benefit: Operates the minimum required number of chillers at peak efficiency in response to building load, minimizing equipment short cycling which improves occupant comfort, reduces equipment wear and tear, and lowers plant energy consumption.

Demand Limiting – Plant capacity is automatically adjusted based on network electric metering, preventing the plant from exceeding pre-defined levels of energy consumption.

Benefit: Limits plant energy consumption to fixed levels, avoiding excess demand charges.

Chilled Water Setpoint Reset – Allows automatic adjustment of the target chilled water setpoint based on either ambient conditions or measured building load.

Benefit: Allows the plant to produce chilled water at a setpoint that varies with the building load, reducing the delivered plant capacity and avoiding short cycling of downstream equipment, thus improving occupant comfort while reducing energy consumption.

Variable Primary Flow Chilled Water Pumping – Automatically varies pump speed proportionally to the building load as measured by the load differential pressure.

Benefit: Reduces energy consumption of chilled water pumps.

Secondary Loop Chilled Water Pumping – Automatically varies the number of running pumps and pump speed proportionally to the building load as measured by the load differential pressure.

Benefit: Reduces energy consumption of chilled water pumps.

Staged or Variable Speed Cooling Tower Fans – Automatically varies either the number of operating fans or the speed of a single operating fan in response to condenser water temperature. Also limits tower capacity when it has reached the maximum possible condenser water temperature based upon ambient conditions and tower approach.

Benefit: Minimizes tower fan run time and/or fan speed, reducing tower energy consumption.

Chilled Water Pump Staging – Automatically matches the number of running pumps to the flow requirements of the running chillers.

Benefit: Reduces unnecessary chilled water pump run time, while preventing insufficient plant chilled water flow. Combining these strategies will reduce plant energy consumption and eliminate chiller short cycling.

Cooling Tower Staging – Automatically matches the number of running towers to the heat rejection requirements of the running chillers.

Benefit: Reduces unnecessary tower and condenser pump run time, while preventing insufficient condenser water flow. Combining these strategies will reduce plant energy consumption and eliminate chiller short cycling.

  • – Cut Sheet    – PSM_CS

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