Trane CVHE-SVU01E-ENX39640712050 manual Constant Return, Values for start reset types, Equation

Page 80

Machine Protection

and Adaptive

Control

Table 3. Values for start reset types

The values for “RESET TYPE” are:

Reset

 

Outdoor

Return

Const Return

Type:

Disable

Air Reset

Reset

Reset

 

 

The values for “RESET RATIO” for each of the reset types are:

 

Reset

Reset

Increment

Increment

Factory

Type

Ratio

English

SI Units

Default

 

Range

Units

 

Value

Return

10 to 120 percent

1 percent

1 percent

50 percent

Outdoor

-80 to 80 percent

1 percent

1 percent

10 percent

 

 

The values for “START RESET “ for each of the reset types are:

 

Reset

Start

Increment

Increment

Factory

Type

Reset

English

SI Units

Default

 

Range

Units

 

Value

Return

4 to 30°F

0.1°F

0.1°C

10°F (5.6°C)

 

(2.2 to 16.7°C)

 

 

 

Outdoor

50 to 130°F

0.1°F

0.1°C

90°F

 

(10 to 54.44°C)

 

 

(32.22°C)

The values for “MAXIMUM RESET” for each of the reset types are:

Reset

Maximum

Increment

Increment

Factory

 

Reset

English

SI Units

Default

 

Range

Units

 

Value

Return

0 to 20°F

0.1°F

0.1°C

5°F

 

(0.0 to 11.11°C)

 

 

(2.78°C)

Outdoor

0 to 20°F

0.1°F

0.1°C

5°F

 

(0.2 to 11.11°C)

 

 

(2.78°C)

Constant Return

CWS’ = CWS + 100 percent (Design Delta Temperature) - (TWE- TWL) and CWS’ > or = CWS and CWS’ -CWS < or = Maximum Reset

Notice that Constant Return is nothing more than a specific case of Return Reset offered for operator convenience.

When any type of CWR is enabled, the UCP will step the CWS toward the desired CWS (based on the above equations and setup parameters) at a rate of 1°F every 5 minutes until the Active CWS equals the desired CWS’. This applies when the chiller is running only.

Using the Equation for calculating CWR for Outdoor Air Temperature

Equation:

Degrees of Reset = Reset Ratio*(Start Reset - TOD)

The chiller will start at the Differential to Start value above a fully reset CWS or CWS for both Return and Outdoor Reset.

The graph on the next page, shows the reset function for Outdoor Air Temperature: Note: This graph assumes that Maximum Reset is set to 20 degrees.

Degrees of Reset:

Degrees of Reset = Active CWS - Front Panel CWS

or

Degrees of Reset = CWS’ - CWS

To obtain Active CWS from Degrees of Reset: Active CWS = Degrees of Reset + Front Panel CWS

(* = multiply)

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CVHE-SVU01E-EN

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Contents Operation Maintenance Read these carefully Contents General Information Literature changeAbout this manual Unit NameplateCVHF091NAL00ACU2758W7E8TB C0000000K01G14C10W1A03B1Commonly Used Acronyms Control Optional PackagesOverview CvhfGeneral Information General Information Cooling Cycle Cvhf CompressorCVHE, Cvhg pressure enthalpy curve Cvhf pressure enthalpy curve TechView Chiller Service Tool DynaView Human InterfaceCVHE, CVHF, and Cvhg sequence of operation running General Information Surface Temperatures Oil and Refrigeration PumpOil refrigerant pump Base Loading Control Algorithm 20 100 percent RLAGeneral Information Ice Machine Control Free Cooling Cycle Free Cooling Frcl Hot Gas Bypass Hot Water control Heat Recovery Cycle Auxiliary CondensersUnit Control Panel UCP Unit Control Panel UCPControl Panel Devices and Unit Mounted Devices Variable water flow through the evaporator User-defined language supportOperator Interface DynaView main processorOperator Interface Chiller Stop Prevention/Inhibit Feature How It WorksTop Level Mode Description System Reset MinsecReference Main Screen Diagnostic Screen Back button provides navigation back to the chiller screen Operator Interface Reports Evaporator Report items Units Condenser Report Items UnitsCompressor Report Items Units Motor Report Items UnitsRPM Purge Report Items UnitsHistoric Diagnostics Log Ashrae Chiller Log UnitsRLA PPMChilled Water Setpoint Feature Settings Mode OverridesDescription Units Default Monitor Value ChillerPurge Description Units DefaultDisplay Settings Operator Interface Operator Interface Operator Interface Operator Interface Operator Interface Interprocessor Communication Inter Processor Communications IPC3IPC3 Definitions Bus Management BindingControl panel components layout and approximate dimensions Control System ComponentsControl System Components Control Panel Devices Machine Shutdown Manual Reset MMR Head Relief Request OutputCompressor Running Relay OpstRefrigerant Monitor Input 1A17 ExopFrcl Free Cooling Option Hgbp Hot Gas Bypass OptionTrmm TRM4 Tracer Comm 4 interface Cdrp Condenser Refrigerant Pressure OutputPressure based Temperature basedCondenser Pressure Output Refrigerant Differential Pressure Indication Output Percent RLA Output Gbas Generic Building Automation SystemGbas Module Characteristics External Chilled Water Setpoint EcwsExternal Current Limit Setpoint Wpsr WFC Water Pressure Sensing Option1A8, 1A9, 1A11, 1A12 Quad Relay Output Status 1A13, 1A18, 1A19, 1A20 Dual Binary input module1A14 Communication interface Module Comm +Analog 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 Momentary Power Loss MPL Protection Machine Protection Adaptive ControlCurrent Overload Protection Overload trip time versus percent RLAReverse Rotation Protection Phase Loss ProtectionCurrent Limit Protection Minimum and Maximum Capacity Limit Differential to Start or StopSoftLoading Leaving Water Temperature Cutout Evaporator LimitLow Refrigerant Temperature Cutout Main Processor Software Revision 6.0 and higherCutout strategy Evaporator Variable Flow Compensation Condenser LimitRestart Inhibit Start to Start Time Setting Restart InhibitRestart Inhibit Free Starts Clear Restart InhibitHigh Vacuum Lockout Oil Temperature Control Controls Chilled Water Reset CWR Outdoor Air TemperatureMaximum Reset Return WaterValues for start reset types Degrees of ResetConstant Return EquationReset Ratio Outdoor air temperature versus degrees of resetReset function for return CWR Reset Ratio = 50% Return CWR Daily Unit Start-Up Unit Start-Up ProceduresUnit Startup Before changeover to heating mode Live Electrical ComponentsToxic Hazards Seasonal Unit Start-UpUnit Shutdown Procedures Unit ShutdownOil Pump Heater Operation Seasonal Unit ShutdownPeriodic Maintenance Daily Maintenance and ChecksMoisture Contamination Record Keeping FormsWeekly Maintenance Normal Chiller Operating CharacteristicsHazardous Voltage w/ Capacitors Every 3 MonthsOff-Season Maintenance Annual MaintenanceOil Maintenance Oil Change ProcedureHeater Damage Compressor Oil Change onOil Filter Replacement Replacing Oil FilterMaintenance Oil Supply System ProblemsOther Maintenance Requirements LubricationDo not Leave Grease Fittings Installed Front View with Refrigerant PumpContains Refrigerant Refrigerant ChargeRecovery and Recycle Connections Leak TestingCleaning the Condenser Proper Water TreatmentUnit Corrosion Damage Cleaning the EvaporatorControl Settings Adjustments Purge System Unit PreparationHazardous 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.
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