Trane CVGF manual Oil-Temperature Protection, Low Differential Oil-Pressure Protection

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Controls

Standard Protections

Oil-Temperature Protection

Low oil temperature when the oil pump and/or compressor are running may be an indication of refrigerant diluting the oil. If the oil temperature is at or below the low oil-temperature setpoint, the compressor is shut down on a latching diagnostic and cannot be started. The diagnostic is reported at the user interface. The oil heaters are energized in an attempt to raise the oil temperature above the low oil-temperature setpoint.

High oil-temperature protection is used to avoid overheating the oil and the bearings.

Low Differential Oil-Pressure Protection

Oil pressure is indicative of oil fl ow and active oil-pump operation. A signifi cant drop in oil pressure indicates a failure of the oil pump, oil leakage, or a blockage in the oil-circuit.

During Compressor prelube the differential pressure should not fall below 12 psid. Shutdown diagnostic will occure within 2 seconds of the differential pressure falling below two-thirds of the low differential oil-pressure cutout.

Phase-Unbalance Protection

Phase-unbalance protection is based on an average of the three phase-current inputs. The ultimate phase-unbalance trip point is 30 percent. In addition, the RLA of the motor is derated by resetting the active current-limit setpoint based on the current unbalance. The RLA derate protection can be disabled in the fi eld-startup menu.

The following derates apply when the phase-unbalance limit is enabled:

10% unbalance = 100% RLA derate

15% unbalance = 90% RLA derate

20% unbalance = 85% RLA derate

25% unbalance = 80% RLA derate

30% unbalance = Shutdown

 

Phase-Loss Protection

The controller will shut down the chiller if any of the three phase currents feeding the motor drop below 10 percent RLA. The shutdown will result in a latching phase-loss diagnostic. The time to trip is 1-3 seconds.

Phase Reversal/Rotation Protection

The controller detects reverse phase rotation and provides a latching diagnostic when it is detected. The time to trip is 0.7 seconds.

Momentary Power Loss and Distribution Fault Protection

Three-phase momentary power loss (MPL) detection gives the chiller improved performance through many different power anomalies. MPLs of 2.5 cycles or longer will be detected and cause the unit to shut down. The unit will be disconnected from the line within 6 line cycles of detection. If enabled, MPL protection will be active any time the compressor is running. MPL is not active on reduced-voltage starters during startup to avoid nuisance trips. The MPL diagnostic is an automatic reset diagnostic.

An MPL has occurred when the motor no longer consumes power. An MPL may be caused by any drop or sag in the voltage that results in a change in the direction of power fl ow. Different operating conditions, motor loads, motor size, inlet guide vane (IGV) position, etc. may result in different

CTV-PRC001-E4

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Contents Model Cvgf Centrifugal Water ChillersIntroducing Trane’s Model Cvgf Centrifugal Water Chiller IntroductionIntroduction Contents Standard Cvgf Features Features and BenefitsEnvironmental Features and Benefits Features and BenefitsAdditional Features and Benefits At-a-glance status CD-ROM Features and Benefits Tracer TU InterfaceBuilding Automation and Chiller Plant Control Features and Benefits Tracer AdaptiViewTM ControllerIntegrated Comfort System ICS Chiller-Tower OptimizationTwo-Stage Compressors Surge Less and Later Why Centrifugal Compressors SurgeWater Pumps TemperatureApplication Considerations Condenser Water LimitationsWater Treatment Application ConsiderationsTable GD-1 Model Cvgf Description General Data60 Hz SI Units and English Units General DataShipment and Assembly Supply and Motor Lead Wiring and ConnectionsJobsite Connections Controls Standard FeaturesHot-Water Control ControlsExtended Operation Package Base-Loading ControlStandard Protections Phase Reversal/Rotation Protection Oil-Temperature ProtectionPhase-Unbalance Protection Phase-Loss ProtectionSurge Detection Protection High Motor-Winding Temperature ProtectionPower Factor and kW Measurement Current Overload ProtectionRestart Inhibit Free Starts Short-Cycling Protection60 Hz SI English Units Physical DimensionsModel Cvgf Water Connection Pipe Size Physical DimensionsMechanical Specifications Condenser Mechanical SpecificationsUnit Control Panel Painting Compressor-Motor StarterIsolation Pads Refrigerant and Oil ChargePSI Conversion Table
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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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