Liebert XDC user manual

Page 29

Piping and Filling with Refrigerant: R-134a and R-407c Circuits

For Air Cooled Lee-Temp / Flood Back Head Pressure Control Units Only

NOTE

Proper safety equipment and proper refrigeration tools are required. Check unit nameplate for correct refrigerant type before topping off or recharging a system.

NOTE

Refrigerant R-407c is a blend of three components and must be introduced and charged from the cylinder only as a liquid.

Refrigerant R-407c uses a POE (polyolester) lubricant. Do not open the compressor unit piping to the atmosphere for more than 15 minutes. The compressors contain POE oil that is very hygroscopic; it quickly absorbs water from the atmosphere. The longer the compressor piping is open to the atmosphere, the harder it will be to fully evacuate. If left open too long, the POE oil may need to be replaced before achieving the required vacuum level.

POE oils also have a property that makes them act as a solvent in a refrigeration system. Maintaining system cleanliness is extremely important because the oil will tend to bring any foreign matter back to the compressor. Refer to the ASHRAE refrigeration handbook for general good-practice refrigeration piping.

23

Image 29

Contents Liebert XDC Example XDC160AA General Safety GuidelinesVoltage-phase-frequency Density system = 380/415-3ph-50Hz Table of Contents Specifications Alarm Descriptions and SolutionsFigures Tables Equipment Inspection General Product InformationEquipment Handling Product DescriptionRemoval of Skid Handling With SkidRemove tie-down brackets Mechanical Considerations Liebert XDC dimensions, weightRemoving Piano Jacks Positioning the Liebert XDCLiebert XDC piping connection sizes Piping locationsPlacing the Liebert XDC on a Floor Stand Liebert XDC water/glycol piping connection Sizes Detail aTOP View of Floor Stand Positioning the Liebert XDC with Floor Stand Dimensions and clearances for Liebert XDC on floor standHigh Voltage Connections Connecting High-Voltage CablesElectrical enclosure knockout locations for field wiring Contactors Liebert XDC heat rejection connection points Extra Low Voltage ConnectionsField Connections-Air Cooled Units only Field Connections-All UnitsField Connections-Optional for All Units Extra Low Voltage field connections points Recommended Pipe Size European Union Fluorinated Greenhouse Gas RequirementsLiebert XDC Interconnection With Liebert XD Cooling Module Supply, return pipe sizes for Liebert XD refrigerant loopPiping Mains Piping Installation MethodPiping Installation-R-134a Pumped Circuit Required Number Bypass Flow ControllersBypass flow controllers for a Liebert XDC-based system Liebert XDP Liebert XDC Evacuation and Leak Check-R-134a Pumped CircuitInsulation System refrigerant charge for the supply and return mains Filling the Pumped Circuit-R-134aWorksheet to calculate refrigerant charge Calculating Refrigerant Charge-ExampleCalculating refrigerant charge-example Double discharge riser layout Install Double Discharge RisersPage Installation data-Lee-Temp, one-circuit, four-fan model See for details on piping connections Piping Schematic Recommended refrigerant line sizes, DX R-407c, OD copper General arrangement air cooled Liebert XDC Lee-Temp ControlRecommended refrigerant line sizes for DCSL616 For mounting instructions, refer to Figure Lee-Temp Control Materials Supplied Lee-Temp PipingIndoor unit refrigerant charge-R-407c Filling the Direct Expansion DX Circuit-R-407cOutdoor air condenser charge-R-407c Indoor water/glycol cooled module R-407C refrigerant chargeInstallation Checklist Indicator Lights Description Green Red Checklist for Liebert XDC StartupLiebert XDC pump light indicator Compressor Type 407c Compressor oil typesRefrigerant Type Liebert XDC system is now ready to be turned on Microprocessor Control Feature OverviewDisplay User interface keypad functionsViewing or Changing Settings Feature OverviewControls Main MenuSetpoints Setpoint functions, default values and allowable rangesMIN Temp SP HI AIR TempAlarm History Active AlarmsStatus TimeRestart Setup OperationDegrees Pump Start TDLead Pump Pump OFF TDLead Tandem DipswchSetup Password Setpt PasswordCalibrate Sensors Alarm EnableCustom Alarms Alarm Time DelayCOM Alarm Enable Custom Text DiagnosticsAlarm Descriptions and Solutions Alarm DescriptionsRed and Green Lamp Indicators View Active Alarms Enable / Disable AlarmsAlarm Time Delays System Shutdown Causes View Alarm HistoryLiebert XDC troubleshooting TroubleshootingToo warm Air Cooled Condenser MaintenanceFluorinated Greenhouse Gas Requirements Glycol Solution Maintenance Testing the Water Regulating Valve FunctionWater/Glycol Floor Stand Condenser Shell and Tube CondensersLiebert XDC specifications SpecificationsHeat Rejection Equipment Performance DataPiping Connections Performance Data204 Page Iti Ne tTi n That