Trane CVGF manual Feedforward Adaptive Control, Soft Loading, Fast Restart

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Features and Benefits

Feedforward Adaptive Control

TheTracer chiller controller allows the system designer to explore energy saving strategies and allows the centrifugal chiller to be used in ways that were never thought possible.

Feedforward Adaptive Control Feedforward is an open-loop, predictive control strategy designed to anticipate and compensate for load changes. It uses evaporator entering- water temperature as an indication of load change. This allows the controller to respond faster and maintain stable leaving-water temperatures.

Soft Loading

The chiller controller uses soft loading except during manual operation. Large adjustments due to load or setpoint changes are made gradually, preventing the compressor from cycling unnecessarily. It does this by internally filtering the setpoints to avoid reaching the differential-to-stop or the current limit. Soft loading applies to the leaving chilled-water temperature and current-limit setpoints.

Multi-Objective Limit Arbitration There are many objectives that the controller must meet, but it cannot satisfy more than one objective at a time.Typically, the controller’s primary objective is to maintain the evaporator leaving-water temperature.

Whenever the controller senses that it can no longer meet its primary objective without triggering a protective shutdown, it focuses on the most critical secondary objective. When the secondary objective is no longer critical, the controller reverts to its primary objective.

Fast Restart

While the inlet guide vanes are closing, the controller will allow the centrifugal chiller to restart and going to a postlube operational mode. If the chiller shuts down on a nonlatching diagnostic, the diagnostic has 30–60 seconds to clear itself and initiate a fast restart. This includes momentary power losses.

Building Automation and Chiller Plant Control

For a preprogrammable and flexible building automation and chiller plant control,Trane has developed the Tracer Summit™. It can control the operation of the complete installation: chillers, pumps, cooling towers, isolating valves, air handlers and terminal units. Trane can undertake full responsibility for an optimized automation and energy management for the entire chiller plant.

The main functions are:

•Chiller sequencing: equalizes the number of running hours of the chillers. Different control strategies are available depending on the configuration of the installation.

•Control of the auxiliaries: includes input/output modules to control the operation of the various auxiliary equipments (water pumps, valves, cooling towers, etc.)

•Time of day scheduling: allows the end user to define the occupancy period, i.e. time of the day, holiday periods and exception schedules.

•Optimization of the start/stop time of the installation: based on the programmed schedule of occupancy and on the historical record of the behavior of the temperatures, calculates the optimal time of start and stop of the installation to get the best compromise between energy savings and comfort of the occupants.

•Soft loading: the soft loading function minimizes the number of chillers that are operated to satisfy the building morning pull down, thus preventing an overshoot of the actual capacity required. Unnecessary starts are avoided and the peak current demand is lowered.

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Contents Centrifugal Water Chillers Introduction IntroductionContents Additional Features and Benefits Features and BenefitsStandard Cvgf Features Environmental Features and BenefitsDynaView Operator Interface Microprocessor Controls with CH530TechView ServiceabilitySoft Loading Feedforward Adaptive ControlFast Restart Chiller-Tower Optimization Two-Stage Compressor Widens the Application Range Why Centrifugal Compressors SurgeTwo-Stage Compressors Surge Less and Later Water Flow TemperatureCondenser Water Limitations Water PumpsTable GD-1 Model Cvgf Description General DataEnglish Units GeneralJobsite Connections Shipment and AssemblyMotor Control and Compressor Protection Standard FeaturesField Connection Heat Exchanger ControlHot-Water Control Controls FeaturesExtended Operation Package Base-Loading ControlLoss of Water-Flow Protection Oil-Temperature ProtectionPhase-Loss Protection Tracer Chiller ControllerSurge Detection Protection Momentary Power LossHigh Motor-Winding Temperature Protection Current Overload ProtectionPhysical DimensionsModel Cvgf Water Connection Pipe Size Physical DimensionsMechanical Specifications Unit Control Panel Insulation Isolation PadsRefrigerant and Oil Charge PaintingConversion Length Energy and Power and CapacltyServicing of equipment referred to in this publication
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Manual 28 pages 34 b

CVGF specifications

The Trane CVGF series is a revolutionary innovation in the world of commercial HVAC systems, designed to deliver unparalleled performance and energy efficiency. This air-cooled chiller line is specifically engineered to meet the demands of modern buildings, making it an ideal choice for various applications such as offices, hospitals, and educational institutions.

One of the standout features of the CVGF series is its use of the Trane Adaptive Control technology. This advancement provides the system with real-time data analytics, allowing it to automatically adjust cooling output based on environmental conditions and load requirements. This level of adaptability not only enhances occupant comfort but also contributes to significant energy savings, aligning with sustainability goals.

The CVGF chillers also incorporate a robust and efficient scroll compressor, which operates quietly and minimizes vibration. This design choice ensures reliability and longevity while reducing operational noise levels, making it suitable for installations in noise-sensitive environments. Furthermore, the scroll compressor's efficiency plays a crucial role in achieving a higher coefficient of performance (COP), which translates to lower energy costs.

In terms of environmental responsibility, the CVGF series is designed with an eco-friendly refrigerant that supports lower global warming potential (GWP). Committed to sustainability, Trane ensures that these chillers not only meet but exceed regulatory requirements, allowing businesses to operate with a reduced carbon footprint.

Another remarkable characteristic of the CVGF line is its modular design, which simplifies installation and maintenance. The units are compact and can be easily integrated into existing infrastructure, minimizing disruption during upgrades or replacements. The straightforward maintenance protocols further enhance the system’s uptime, ensuring users enjoy consistent and reliable cooling performance.

Moreover, the CVGF chillers are equipped with advanced monitoring capabilities, accessible through Trane’s proprietary software. This feature enables facility managers to oversee system performance from any location, facilitating proactive adjustments and timely maintenance interventions.

Overall, the Trane CVGF series stands out as a cutting-edge solution for effective and sustainable cooling in commercial applications. By combining innovative technologies, energy-efficient design, and user-friendly features, the CVGF offers a comprehensive approach to achieving optimal climate control while meeting the challenges of the future.
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