Liebert 3000 manual Glycool Cooling, Dual Cooling Source, Chilled Water Cooling, Part Coil

Page 38

System Performance with Advanced Microprocessor Controls

4.1.3Cooling Operation

1-Step Cooling, Compressorized Direct Expansion (DX) Systems

Cooling activates when the temperature control calculates a requirement for cooling of 100%. It is deactivated when the cooling requirement drops below 50%. The hot gas bypass is energized on a call for cooling unless there is also a call for dehumidification.

To aid in lubricating the compressor, the hot gas bypass solenoid is delayed for 30 seconds on the ini- tial call for cooling and de-energized for 30 seconds during every 60 minutes of continuous operation.

2-Step Cooling, Compressorized Direct Expansion (DX) Systems with Part Coil (optional)

Cooling activates when the temperature control calculates a requirement for cooling of 50%. If the system is designed for part coil operation, part coil is active and the hot gas bypass would be acti- vated. At 100% cooling requirement, operation would be full coil and the hot gas bypass would be acti- vated. When the cooling requirement drops to 75%, the system returns to part coil, and turns off the compressor when the requirement drops to 25%.

Table 13 Cooling/dehumidification load status response

 

 

 

LLSV2

 

 

 

LLSV1

Part Coil

HGBP

 

 

 

 

 

1

Step Cooling Only

On

Off

On

 

 

 

 

 

2

Step Cooling Only

On

On

On

 

 

 

 

Dehumidifying Only

On

Off

Off

 

 

 

 

 

1

Step Cooling w/Dehumidifying

On

Off

Off

 

 

 

 

 

2

Step Cooling w/Dehumidifying

On

On

Off

 

 

 

 

 

GLYCOOL Cooling

When GLYCOOL cooling is available, the temperature control will calculate a total cooling require- ment of 200% rather than 100%. Assuming that full GLYCOOL capacity is available, the GLYCOOL valve opens proportionally as the requirement for cooling rises from 0 to 100%. If more than 100% cooling is required, then the compressor is activated at 200%. If full GLYCOOL capacity is not avail- able, then the GLYCOOL valve will be opened proportionally over a cooling requirement band equal to the available GLYCOOL capacity. The compressor would be activated at a cooling requirement of 100% above the available GLYCOOL capacity.

For example, if the GLYCOOL capacity is 60%, then the GLYCOOL valve would be full open at 60% cooling requirement and the compressor would be in full cooling at 160%. In order to reduce compres- sor cycling and prevent hunting, GLYCOOL capacity first becomes available when the entering glycol temperature is at least 8°F (22% capacity) below the return air temperature, or 3°F below the return air temperature for 2 hours. GLYCOOL capacity approaches 100% when the glycol temperature is 25 degrees F below the return air temperature. The system will continue to Econ-O-Cool as necessary as long as the entering glycol temperature remains at least 3°F (0% capacity) below the return air tem- perature. If GLYCOOL is not available, the temperature control will operate the compressor in the same manner as a 1-step or 2-step system without GLYCOOL. The control will not permit compressor operation if the chilled water temperature is below the minimum chilled water temperature selected through the SETUP OPERATION menu.

Dual Cooling Source

If dual cooling is available, the sensible cooling system operates in the same manner as a GLYCOOL system, except that it is assumed that 100% chilled water capacity is available any time the chilled water temperature is 3°F cooler than the return air temperature.

Chilled Water Cooling

The chilled water control valve is adjusted proportionally as the temperature control varies the requirement for cooling from 0% to 100%.

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Contents Liebert Challenger Page Table of Contents Run Diagnostics Alarm Descriptions Component Operation and MaintenanceHumidifier Figures Page Glycool Chilled Glycol Cooling Systems System DescriptionsCompressorized Systems Chilled Water SystemsStart-Up Procedure Basics Advanced microprocessor control panelAdvanced microprocessor a control for Challenger Main Menu MENU/ESC Status/Alarm DataStatus Display Run Hours Log Setpoints/SetupDefault setpoints and ranges Analog SensorsSetup System Setup OperationCalibrate Sensors Show DIP SwitchesSelect Options Default Time Setup AlarmsAlarm default time delays Alarm Delay secondsStandard Custom Alarm Messages Humidity HUM Control MethodCalibrate Actuator Analog SetupSet Status Display Test Outputs Run DiagnosticsShow Inputs Test Control BoardControl Circuit Board Change PasswordsDate and Time LCD Display ContrastControl Outputs DIP SwitchesNon-Volatile Memory Control output LEDsOperation with Advanced Microprocessor with Graphics Control Advanced microprocessor with graphics control menu View/Set Alarms See 3.7.7 Set Status DisplaySetup Alarms View Water Detect Floor Plan for Optional LTM1000/LT750 Setup Custom AlarmsSetup Water Detect Floor Plan Operating Status System SetupCold Start Delay View/Set Control SetpointsIR Flush Overfill infrared humidifiers only Auto Restart DelayDefault Settings and Ranges Chilled Water/Hot Water/Econ-O-Coil FlushCalibrate Valve Actuator Select Control Algorithm Chilled Water and SCR Reheats onlyRun Diagnostics Select Humidity Sensing ModeShow Inputs Modify Plot Scales Setting optionsPlot Graphs Analog/Digital Inputs View Run Hours LogLCD Contrast View 24 Hour Run Time HistoryView Total Run Hours Nonvolatile Memory Response to Control Types Proportional Control Temperature ControlCooling/Heating Required, in Percent % PID Control Chilled Water or SCR Reheats onlyChilled Water Cooling Glycool CoolingDual Cooling Source Cooling/dehumidification load status responseHot Water Reheat Humidity ControlHeating Operation Electric Reheat SCR Electric Reheat Requires Special Control SoftwareProportional Control Control TypesHumidification Operation System Activation Time between peaks x 5% Connecting the Analog Sensors Load Control FeaturesAdditional Features Short Cycle ControlWater Detection Display Installation-LT750 DIP Switch SettingsFault LT750 Environmental UnitCalibration SetupPhysical Connections Communications Liebert Monitoring Devices and SoftwareStandard Alarms Change FilterCompressor Overload Custom AlarmsHigh Temperature High Head PressureLoss of Power High Temperature and Low Temperature SimultaneouslyHumidifier Problem Infrared Humidifiers Low TemperatureOptional/Custom Alarms System Testing Water Detection Sensor FirestatSmoke Detector Liebert unit Recommended Liquitect location Floor drainRemote Shutdown Zone leak detection kit installation scenariosFilters Distance From UnitBelt Blower PackageFan Impellers and Bearings Air DistributionDischarge Pressure Refrigeration SystemSuction Pressure SuperheatHot Gas Bypass Valve Operation AdjustmentThermostatic Expansion Valve Operation Outdoor fan/condenser configuration Air Cooled CondenserValve spring guide Water/Glycol Cooled Condensers Coaxial CondenserRegulating Valve Glycol Solution Maintenance Adjusting Collar NutMechanical Failure Compressor ReplacementCompressor Functional Check Compressor Replacement Procedure Electrical FailureInfrared Humidifier Cleaning the PanHumidifier Removing the PanAutoflush Controls Autoflush Infrared Humidifier Cleaning SystemAutoflush Operation Steam Generating HumidifierOperation ControlsPart Capacity Number Voltage Lbs/hr kg/hr Replacing the CanisterHumidifier canister part numbers 200-460Circuit Board Adjustments Drain Tempering FeatureSymptom Possible Cause Check or Remedy Blower troubleshootingChilled water troubleshooting Compressor and refrigeration system troubleshooting Compressor and refrigeration system troubleshooting Infrared humidifier troubleshooting Dehumidification troubleshootingGlycol pump troubleshooting See 6.4.8 Compressor Functional Check and TableSteam generating humidifier troubleshooting Reheat troubleshooting Compressor Filters Steam Generating HumidifierBlower Section Air Cooled Condenser if applicableGlycol Pump FiltersWater/Glycol Condenser if applicable Electrical PanelSemiannual Maintenance Inspection Checklist Page Ti n Ne tIti That
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3000 specifications

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