Liebert user manual Liebert XDC system is now ready to be turned on

Page 41

Checklist for Liebert XDC Startup

The Liebert XDC system is now ready to be turned ON.

1.Turn On all fans of the Liebert XD cooling modules.

2.Turn the Liebert XDC On via user interface (I/O button). Allow the system to attempt to start for at least 2 minutes.

If the Liebert XDC pump cannot maintain flow and continues to switch over due to starting diffi- culties, proceed to Step 4 and refer to the troubleshooting section of the Liebert XDC user man- ual.

3.If constant flow is established, wait until the Liebert XDC has been operating 10-15 minutes, then verify that the refrigerant level in the receiver sight glass is between the second and third level (see Figure 31). Add or remove charge as indicated by sight glass level.

4.Check pressure differential functionality:

The Liebert XDC system should be On. If it is Off:

a.Turn On the Liebert XD cooling module fans

b.Turn the Liebert XDC On via user interface (I/O button).

If there is no “Loss of Flow” alarm present—This suggests that there is flow. Test the pressure differential by closing the ball valve on either the suction line or discharge line to stop the flow.

This should prompt an alarm for “loss of flow on P1.” This alarm confirms that the switch has opened on low pressure (below 6 psi; 41 kPa; 0.41 bars).

If there is a “Loss of Flow” alarm present—This suggests that there is no flow. Verify that this is correctly annunciated by looking at the sight glass in the receiver. If a true no-flow condition exists, the level will not move.

However, if there is flow, but the differential reading is faulty, the level will slowly drop, indicating flow, while the loss of flow alarm is annunciated.

Check the pressure differential physically by making sure that the electrical connections are properly connected. Then check the pressure differential electrically by making sure that the unit has 24VAC across it.

Figure 31 System R-134a liquid level

Operation above sight glass#3 can make the system operate erratically and reduce cooling capacity- Reduce charge to recommended level.

Recommended operating level

Acceptable operating level

Operation below sight glass#1 may cause loss of flow or cooling. Add charge to reach recommended level.

For lightly loaded systems, the recommended operating level is sight glass#2.

Sight Glasses 1, 2 & 3

35

Page 40 Page 42
Image 41
Page 40 Page 42
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
Top Page Image Contents