Trane ctv-prc007-en manual Figure O-5 Compressor Operation Schematic

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Unit

Options

Free Cooling

 

 

 

 

Temperature and humidity control requirements are important considerations when evaluating the use of CenTraVac free cooling. Low temperature outside air (from the outside air economizer) often requires a large amount of energy for humidification purposes. Free cooling operation helps to reduce these humidification costs on many applications.

It is important to note that those applications which require extremely precise humidity control typically cannot tolerate warmer than design chilled water temperatures. Therefore, since free cooling chillers normally deliver warmer than design chilled water temperatures, free cooling operation is usually not applicable with systems which require precise humidity control.

Also, free cooling is generally not used in conjunction with heat recovery systems, since mechanical cooling must be used to recover heat that will be used elsewhere in the building for simultaneous heating.

Operation

Free cooling operates on the principle that refrigerant flows to the area of lowest temperature in the system. The Tracer™ system/Chiller Plant Manager (CPM) can be used for automatic free cooling control. When condenser water is available at a temperature lower than the required leaving chilled water temperature, the CPM starts the free cooling cycle. If the load cannot be satisfied with free cooling, the CPM

or a customer supplied system can automatically switch to the powered cooling mode. If desired, the chiller can be manually switched to the free cooling mode at the unit control panel. Upon changeover to free cooling, the shutoff valves in the liquid and gas lines are opened and a lockout circuit prevents compressor energization. Liquid refrigerant drains by gravity from the storage tank into the evaporator, flooding the tube bundle. Since the refrigerant temperature and pressure will be higher in the evaporator than in the condenser, due to the water temperature difference, the refrigerant gas boiled off in the evaporator will flow to the condenser. The gas then

condenses and flows by gravity back to the evaporator. This automatic refrigeration cycle is sustained as long as a temperature difference exists between the condenser water and evaporator water.

The difference in temperature between the condenser and evaporator determines the rate of refrigerant flow between the two shells and hence the free cooling capacity.

If the system load becomes greater than the free cooling capacity either the operator manually stops free cooling, a binary input from a customer-supplied system disables free cooling or the CPM can automatically perform this function. The gas and liquid valves close and the compressor starts. Refrigerant gas is drawn out of the evaporator by the compressor, compressed and introduced into the condenser. Most of the condensed liquid first takes the path of least resistance by flowing into the storage tank which is vented to the high pressure economizer sump by a small bleed line. When the storage tank is filled, liquid refrigerant must flow through the bleed line restriction. The pressure drop through the bleed line is greater than that associated with the orifice flow control device, hence liquid refrigerant flows normally from the condenser through the orifice system and into the economizer.

The free cooling accessory consists of the following factory-installed or supplied components:

•A refrigerant gas line, including an electrically actuated shutoff valve, installed between the evaporator and condenser.

•A valved liquid return line including an electrically activated shutoff valve, between the condenser sump and evaporator.

•A liquid refrigerant storage vessel.

•Added refrigerant charge.

•Manual free cooling controls on the unit control panel.

For specific information on free cooling applications, contact the local Trane sales office.

Figure O-5 — Compressor Operation Schematic

Figure O-6 — Free Cooling Operation Schematic

CTV-PRC007-EN

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Contents CenTraVac Liquid Chillers Emissions Chiller IntroductionWorld’s Most Efficient LowestContents Tradition of Innovation Trane HermeticCentrifugal Water ChillersLhcv CenTraVac Modular Chiller system IntroductionLow Pressure FeaturesBenefits AttributesCapabilities include ControlPanel Operator Control PanelBenefits Components FeaturesStandard Features and and Optional Benefits FeaturesStandard Features Optional FeaturesFactory Testing for Assured Performance Features and Performance Benefits TestingFactory Cycle RefrigerationCenTraVac Chiller Operating Cycle Two-Stage CenTraVac P-H Diagram Starter UnitOptions Unit MountedReliability FeaturesOperation Integral Bypass Contactors Available options includeLarge number of part-load operating hours annually AdaptiveFrequency Drives BenefitsHigh kW Charges Condenser water temperature relief of chilled water resetEase of Operation Ease of InstallationUnit Free CoolingFigure O-5 Compressor Operation Schematic Auxiliary Condenser System Auxiliary Options CondenserControls SystemAuxiliary CondenserIce Storage SystemSystem Options Heat RecoverySystem Design Considerations Heat RecoveryCont Simultaneous Heating and CoolingChilled Water Reset Chilled water ResetChilled Water Considerations ApplicationFor Applications Requiring Tons 60 Hz Choose Lhcv Electrical Information Condenser Water LimitationsSelection Procedure Part Load Performance Roughing-in DimensionsEvaporator and Condenser Data Tables Flow Rates PerformanceData EvaporatorMinimum/Maximum Condenser Flow Rates GPM Shipment and Assembly Supply and Motor Lead Wiring and ConnectionsJobsite Connections Advanced Controls ControlsSystems Performance Chiller Plant Controls ControlBuilding Automation and Chiller Plant Control Control Functions Functions Controls ProtectionsMachine Protections Functions Controls Diagnostics Modules ControlsModules/Sequence OperationUnit is Running Capacity Limited by High Current Hz Compressors WeightsCvhg Physical DimensionsEnglish Units SI Units ML &LL 10630 3867 4080 4724 1327 4578 2908 2419 2632 Waterbox Physical Connection Dimensions ArrangementWaterbox Lengths English Units Physical DimensionsWaterbox Lengths Metric Units Compressor Mechanical SpecificationEvaporator Unit Control Panel Condenser/Heat Recovery CondenserEconomizer Purge SystemInsulation Isolation PadsRefrigerant and Oil Charge Thermometer Wells and Sight GlassesInput Line Reactor Option AFD Design FeaturesTrane Adaptive Frequency Drive AFD Environmental ratingsTrane Company is a participant in the Green Seal Program

ctv-prc007-en specifications

The Trane CTV-PRC007-EN is an advanced air conditioning unit that epitomizes efficiency and reliability in temperature control. Designed for commercial and industrial applications, this unit stands out with a multitude of features aimed at enhancing performance, energy savings, and sustainability.

One of the key characteristics of the CTV-PRC007-EN is its high cooling and heating capacities, allowing it to cater to a variety of environments. The unit utilizes a scroll compressor, known for its energy efficiency and durable design, which contributes to substantial energy savings over time. The inclusion of variable speed technology further optimizes energy use by adjusting to the specific cooling or heating demands of the space.

Equipped with Trane’s proprietary Sintesis technology, the CTV-PRC007-EN offers superior temperature control while minimizing noise levels. This feature makes it ideal for settings where quiet operation is essential, such as offices, hotels, and conference rooms. The unit’s sound-dampening design reduces operational noise, ensuring a comfortable environment for occupants.

Another significant advantage of the CTV-PRC007-EN is its advanced control system. The integration of Smart Temperature Management allows for precise monitoring and adjustment, enhancing the overall user experience. Additionally, the system is compatible with various building management systems, enabling remote monitoring and control, which can significantly reduce operational costs and improve efficiency.

The CTV-PRC007-EN also embraces eco-friendly refrigerants, aligning with global sustainability goals. By using refrigerants with low global warming potential, Trane demonstrates its commitment to reducing environmental impact while maintaining high performance.

Maintenance is straightforward with the CTV-PRC007-EN. The unit's robust design includes accessible components that simplify servicing, helping to minimize downtime and operational costs. It comes with a comprehensive warranty, underscoring Trane’s confidence in the durability and reliability of its products.

In conclusion, the Trane CTV-PRC007-EN stands as a testament to cutting-edge technology in HVAC solutions. With its energy efficiency, advanced control systems, quiet operation, and eco-friendly features, it is an ideal choice for businesses seeking effective climate control solutions that do not compromise on sustainability or performance.
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