Trane CVHE-SVU01E-ENX39640712050 manual Differential to Start or Stop, SoftLoading

Page 71

Machine Protection

and Adaptive

Control

Differential to Start or Stop

The Differential to Start setpoint is adjustable from 1 to 10°F (0.55 to 5.55°C) and the Differential to Stop setpoint adjustable from 1 to 10°F (0.55 to 5.55°C). Both setpoints are with respect to the Active Chilled Water Setpoint. When the chiller is running and the LWT (Leaving Water Temperature) reaches the Differential to Stop setpoint the chiller will go through its shutdown sequence to AUTO. (Refer to Figure 10.)

SoftLoading

Softloading stabilizes the startup control during the initial chiller pulldown. Soft loading is used to bring the building loop temperature from its start value to the Chilled Water or Hot Water Setpoint in a controlled manner. Without soft loading, the chiller controls will load the chiller rapidly and use the full chiller capacity to bring the loop temperature to setpoint. Although the start temperature of loop may have been high, the actual system load may be low. Thus, when the setpoint is met the chiller must unload quickly to the system load value. If it is not able to unload quickly enough, the supply water temperature will

drop below setpoint and may even cause the chiller to cycle off. Soft loading prevents the chiller from going to full capacity during the pulldown period. After the compressor has been started, the starting point of the filtered setpoint is initialized to the value of the Evaporator Leaving Water temperature and the percent RLA.

There are three independent Softload setpoints:

•Capacity Control Softload Time (default to 10 minutes, 0-120 minutes) This setting controls the time constant of the Filtered Chilled Water Setpoint.

•Current Limit Control Softload Time (default 10 minutes; 0-120 minutes) This Setting controls the time constant of the Filtered Current Limit Setpoint.

•Current Limit Softload Starting Percent (default is 40 percent RLA; 20-100 percent): This setting controls the Starting point of the Filtered Current Limit Setpoint

Service tool provides access to these three setpoints, if it is determined necessary to change from the defaults.

Softloading is not active during Ice Making or during the Ice To normal Transition. Softloading will be enabled after the Ice to normal Transition timer has expired.

Softloading is not active during Free Cooling, The softloading is active during the transition from Free Cooling to Powered operation.

Softloading times can be active during Hot Gas Bypass Control

Minimum and Maximum Capacity Limit

A Minimum Capacity can be set to limit the unloading ability of the compressor thus forcing differential to stop to be reached cycling the chillers. Minimum capacity limit will be displayed when in this limit mode. This indicates when the chiller is running fully unloaded.

Similarly a maximum capacity can be set to limit normal chilled water temperature control, the maximum capacity relay is energized which is a signal used by generic BAS systems to start another chiller.

The minimum (default at 0 percent) and maximum (default at 100 percent) capacity are adjustable via the service tool.

CVHE-SVU01E-EN

71

Page 70 Page 72
Image 71
Page 70 Page 72
Contents Operation Maintenance Read these carefully Contents Unit Nameplate General InformationLiterature change About this manualC0000000K01G14C10W1A03B1 CVHF091NAL00ACU2758W7E8TBControl Optional Packages Commonly Used AcronymsCvhf OverviewGeneral Information General Information Cvhf Compressor Cooling CycleCVHE, Cvhg pressure enthalpy curve Cvhf pressure enthalpy curve DynaView Human Interface TechView Chiller Service ToolCVHE, CVHF, and Cvhg sequence of operation running General Information Oil and Refrigeration Pump Surface TemperaturesOil refrigerant pump 20 100 percent RLA Base Loading Control AlgorithmGeneral Information Ice Machine Control Free Cooling Cycle Free Cooling Frcl Hot Gas Bypass Hot Water control Auxiliary Condensers Heat Recovery CycleUnit Control Panel UCP Unit Control Panel UCPControl Panel Devices and Unit Mounted Devices User-defined language support Variable water flow through the evaporatorDynaView main processor Operator InterfaceOperator Interface How It Works Chiller Stop Prevention/Inhibit FeatureTop Level Mode Description Minsec System ResetReference Main Screen Diagnostic Screen Back button provides navigation back to the chiller screen Operator Interface Condenser Report Items Units Reports Evaporator Report items UnitsPurge Report Items Units Compressor Report Items UnitsMotor Report Items Units RPMPPM Historic Diagnostics LogAshrae Chiller Log Units RLAChilled Water Setpoint Chiller Feature SettingsMode Overrides Description Units Default Monitor ValuePurge Description Units DefaultDisplay Settings Operator Interface Operator Interface Operator Interface Operator Interface Operator Interface Binding Interprocessor CommunicationInter Processor Communications IPC3 IPC3 Definitions Bus ManagementControl System Components Control panel components layout and approximate dimensionsControl System Components Control Panel Devices Opst Machine Shutdown Manual Reset MMRHead Relief Request Output Compressor Running RelayExop Refrigerant Monitor Input 1A17Cdrp Condenser Refrigerant Pressure Output Frcl Free Cooling OptionHgbp Hot Gas Bypass Option Trmm TRM4 Tracer Comm 4 interfacePressure based Temperature basedCondenser Pressure Output Refrigerant Differential Pressure Indication Output Percent RLA Output Gbas Generic Building Automation SystemGbas Wpsr WFC Water Pressure Sensing Option Module CharacteristicsExternal Chilled Water Setpoint Ecws External Current Limit SetpointComm + 1A8, 1A9, 1A11, 1A12 Quad Relay Output Status1A13, 1A18, 1A19, 1A20 Dual Binary input module 1A14 Communication interface ModuleAnalog Input Recommended Length to Run external Output signals1A15, 1A16, 1A17, 1A21 Dual Analog Input/output Module Unit mounted devices UCP and Wye-Delta Starter Control Circuits Control Sequence of OperationElectrical Sequence Delay time 200 msec. Opens 2K1 Control Sequence of Operation Test and start timing sequence AFD Machine Protection Adaptive Control Momentary Power Loss MPL ProtectionOverload trip time versus percent RLA Current Overload ProtectionReverse Rotation Protection Phase Loss ProtectionCurrent Limit Protection Minimum and Maximum Capacity Limit Differential to Start or StopSoftLoading Evaporator Limit Leaving Water Temperature CutoutMain Processor Software Revision 6.0 and higher Low Refrigerant Temperature CutoutCutout strategy Condenser Limit Evaporator Variable Flow CompensationClear Restart Inhibit Restart Inhibit Start to Start Time SettingRestart Inhibit Restart Inhibit Free StartsHigh Vacuum Lockout Oil Temperature Control Return Water Controls Chilled Water Reset CWROutdoor Air Temperature Maximum ResetEquation Values for start reset typesDegrees of Reset Constant ReturnOutdoor air temperature versus degrees of reset Reset RatioReset function for return CWR Reset Ratio = 50% Return CWR Daily Unit Start-Up Unit Start-Up ProceduresUnit Startup Seasonal Unit Start-Up Before changeover to heating modeLive Electrical Components Toxic HazardsSeasonal Unit Shutdown Unit Shutdown ProceduresUnit Shutdown Oil Pump Heater OperationRecord Keeping Forms Periodic MaintenanceDaily Maintenance and Checks Moisture ContaminationEvery 3 Months Weekly MaintenanceNormal Chiller Operating Characteristics Hazardous Voltage w/ CapacitorsAnnual Maintenance Off-Season MaintenanceCompressor Oil Change on Oil MaintenanceOil Change Procedure Heater DamageReplacing Oil Filter Oil Filter ReplacementLubrication MaintenanceOil Supply System Problems Other Maintenance RequirementsFront View with Refrigerant Pump Do not Leave Grease Fittings InstalledRefrigerant Charge Contains RefrigerantProper Water Treatment Recovery and Recycle ConnectionsLeak Testing Cleaning the CondenserUnit Corrosion Damage Cleaning the EvaporatorControl Settings Adjustments Unit Preparation Purge SystemHazardous Voltage w/ Capacitors 100 101 102 103 104 105 106 107 108 109 110 111 Trane

CVHE-SVU01E-ENX39640712050 specifications

The Trane CVHE-SVU01E-ENX39640712050 is a high-efficiency centrifugal chiller designed for commercial and industrial applications. This state-of-the-art unit is engineered to provide reliable cooling performance, energy efficiency, and optimized operational flexibility. It is particularly suitable for large-scale facilities that require significant cooling capacity and robust performance under varying load conditions.

One of the most notable features of the CVHE-SVU01E series is its advanced variable speed drive technology. This technology enables the chiller to adjust its speed according to the cooling demands of the facility, resulting in substantial energy savings. By operating at optimal speeds, this unit reduces power consumption and enhances overall efficiency. This is noteworthy in the context of rising energy costs and increasing sustainability demands across various industries.

Moreover, the CVHE-SVU01E is equipped with Trane’s proprietary Compliant Scroll compressor technology. This innovative compressor design minimizes mechanical losses and increases the efficiency of the chiller system. Additionally, the compressor is specifically designed to handle varying refrigerant flow rates, allowing the chiller to maintain performance even when faced with fluctuating conditions.

Another significant characteristic of this chiller model is its use of environmentally friendly refrigerants, aligning with global regulations aimed at reducing greenhouse gas emissions. This commitment to sustainability ensures that the CVHE-SVU01E not only provides excellent cooling performance but also adheres to contemporary environmental standards.

The unit utilizes an advanced control system that simplifies operation and enhances troubleshooting capabilities. The intuitive interface allows facility managers to monitor performance metrics, optimize operation schedules, and conduct remote diagnostics, significantly reducing costly downtime and maintenance efforts.

Furthermore, the compact and modular design of the CVHE-SVU01E makes it easy to install in various settings. Its durability is ensured through the use of high-quality materials and components, designed to withstand the rigors of demanding environments. With reduced maintenance requirements, facility operators can focus on core business functions without frequent interruptions.

In summary, the Trane CVHE-SVU01E-ENX39640712050 combines cutting-edge technologies and features to deliver exceptional performance, efficiency, and reliability in commercial cooling applications. Its advanced design contributes to reduced energy costs, minimal environmental impact, and greater operational flexibility, making it an excellent choice for organizations seeking sustainable and efficient cooling solutions.
Top Page Image Contents