Liebert 3000 manual Temperature Control, Cooling/Heating Required, in Percent %

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System Performance with Advanced Microprocessor Controls

4.0SYSTEM PERFORMANCE WITH ADVANCED MICROPROCESSOR CONTROLS

This section provides details on how your Challenger 3000 unit responds to user inputs and room con- ditions. Refer to this section when you need specific information. This section includes details on con- trol.

4.1Temperature Control

4.1.1Cooling/Heating Required, in Percent (%)

The temperature control program for the advanced microprocessor is based on a calculated % require- ment for cooling/ heating.

4.1.2Response to Control Types Proportional Control

The % requirement is determined by the difference between the return air temperature and the tem- perature setpoint. As the return air temperature rises above the temperature setpoint, the % cooling required increases proportionally (from 0 to 100%) over a temperature band equal to the temperature sensitivity plus 1°F. The % heating requirement is determined the same way as the temperature decreases below the setpoint. With this type of control the temperature at which the room is con- trolled increases as the room cooling load increases. At full cooling load the room would be controlled at a temperature equal to the setpoint plus the sensitivity.

For systems with SCR Reheats, the % requirement is determined only by the difference between the return air temperature and the temperature setpoint. This permits tighter temperature control. The SCR Reheats are controlled in a proportional manner inversely as described above for cooling. When the return air temperature is at the temperature setpoint, the SCR Reheats will be on 100%. As the temperature increased to the temperature setpoint plus the temperature sensitivity, the SCR Reheats will be pulsed proportionally from full on to full off (0% to 100%) until the return air temperature reaches the temperature setpoint plus the temperature sensitivity.

PID Control (Chilled Water or SCR Reheats only)

If PID control is selected, the return air temperature is controlled at or near the temperature setpoint independent of the room load. The % cooling/heating requirement is calculated by adding together three individual terms - proportional, integral, and derivative.

The proportional term is figured in a manner similar to the previously described proportional control. The integral term (sometimes called “reset action”) is figured by measuring how much and for how long the temperature has been above or below the setpoint. If the temperature is above the setpoint, the % cooling requirement is slowly but continuously increased until the total is sufficient to bring the temperature back to the setpoint. The derivative term provides an anticipation control for rapid changes in temperature. If the temperature is rising, the % cooling is increased temporarily until the temperature begins to stabilize. The % heating requirement is increased if temperature is falling.

The proportional, integral, and derivative terms are all adjustable through the control selection menu and should be set or “tuned” to the characteristics of the room being controlled (see 4.3 - Control Types).

Intelligent Control (Chilled Water only)

If intelligent control is selected, the return air temperature is controlled at or near the temperature setpoint. The % cooling/heating required is calculated based on a set of logical “rules” that are pro- grammed into the control. These “rules” simulate the actions that an expert human operator would take if manually controlling the system (see 4.3 - Control Types).

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Contents Liebert Challenger Page Table of Contents Run Diagnostics Component Operation and Maintenance Alarm DescriptionsHumidifier Figures Page Compressorized Systems System DescriptionsGlycool Chilled Glycol Cooling Systems Chilled Water SystemsStart-Up Procedure Advanced microprocessor control panel BasicsAdvanced microprocessor a control for Challenger Status Display Status/Alarm DataMain Menu MENU/ESC Default setpoints and ranges Setpoints/SetupRun Hours Log Analog SensorsSetup Operation Setup SystemSelect Options Show DIP SwitchesCalibrate Sensors Alarm default time delays Setup AlarmsDefault Time Alarm Delay secondsHumidity HUM Control Method Standard Custom Alarm MessagesSet Status Display Analog SetupCalibrate Actuator Show Inputs Run DiagnosticsTest Outputs Test Control BoardDate and Time Change PasswordsControl Circuit Board LCD Display ContrastNon-Volatile Memory DIP SwitchesControl Outputs Control output LEDsOperation with Advanced Microprocessor with Graphics Control Advanced microprocessor with graphics control menu See 3.7.7 Set Status Display View/Set AlarmsSetup Alarms Setup Water Detect Floor Plan Setup Custom AlarmsView Water Detect Floor Plan for Optional LTM1000/LT750 Cold Start Delay System SetupOperating Status View/Set Control SetpointsDefault Settings and Ranges Auto Restart DelayIR Flush Overfill infrared humidifiers only Chilled Water/Hot Water/Econ-O-Coil FlushSelect Control Algorithm Chilled Water and SCR Reheats only Calibrate Valve ActuatorSelect Humidity Sensing Mode Run DiagnosticsShow Inputs Plot Graphs Setting optionsModify Plot Scales View Run Hours Log Analog/Digital InputsView Total Run Hours View 24 Hour Run Time HistoryLCD Contrast Nonvolatile Memory Cooling/Heating Required, in Percent % Temperature ControlResponse to Control Types Proportional Control PID Control Chilled Water or SCR Reheats onlyDual Cooling Source Glycool CoolingChilled Water Cooling Cooling/dehumidification load status responseHeating Operation Electric Reheat Humidity ControlHot Water Reheat SCR Electric Reheat Requires Special Control SoftwareHumidification Operation System Activation Control TypesProportional Control Time between peaks x 5% Additional Features Load Control FeaturesConnecting the Analog Sensors Short Cycle ControlFault Installation-LT750 DIP Switch SettingsWater Detection Display LT750 Environmental UnitPhysical Connections SetupCalibration Liebert Monitoring Devices and Software CommunicationsChange Filter Standard AlarmsHigh Temperature Custom AlarmsCompressor Overload High Head PressureHumidifier Problem Infrared Humidifiers High Temperature and Low Temperature SimultaneouslyLoss of Power Low TemperatureOptional/Custom Alarms System Testing Smoke Detector FirestatWater Detection Sensor Liebert unit Recommended Liquitect location Floor drainFilters Zone leak detection kit installation scenariosRemote Shutdown Distance From UnitFan Impellers and Bearings Blower PackageBelt Air DistributionSuction Pressure Refrigeration SystemDischarge Pressure SuperheatThermostatic Expansion Valve Operation AdjustmentHot Gas Bypass Valve Operation Air Cooled Condenser Outdoor fan/condenser configurationRegulating Valve Water/Glycol Cooled Condensers Coaxial CondenserValve spring guide Adjusting Collar Nut Glycol Solution MaintenanceCompressor Functional Check Compressor ReplacementMechanical Failure Electrical Failure Compressor Replacement ProcedureHumidifier Cleaning the PanInfrared Humidifier Removing the PanAutoflush Operation Autoflush Infrared Humidifier Cleaning SystemAutoflush Controls Steam Generating HumidifierControls OperationHumidifier canister part numbers Replacing the CanisterPart Capacity Number Voltage Lbs/hr kg/hr 200-460Drain Tempering Feature Circuit Board AdjustmentsChilled water troubleshooting Blower troubleshootingSymptom Possible Cause Check or Remedy Compressor and refrigeration system troubleshooting Compressor and refrigeration system troubleshooting Glycol pump troubleshooting Dehumidification troubleshootingInfrared humidifier troubleshooting See 6.4.8 Compressor Functional Check and TableSteam generating humidifier troubleshooting Reheat troubleshooting Blower Section Filters Steam Generating HumidifierCompressor Air Cooled Condenser if applicableWater/Glycol Condenser if applicable FiltersGlycol Pump Electrical PanelSemiannual Maintenance Inspection Checklist Page Iti Ne tTi n That
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3000 specifications

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