Liebert 3000 manual Humidity Control, Heating Operation Electric Reheat, Hot Water Reheat

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System Performance with Advanced Microprocessor Controls

4.1.4Heating Operation

Electric Reheat

The two heat stages are activated when the temperature control calculates a requirement of 50% and 100%, respectively. Each stage is deactivated when the heat requirement is 25% less than the activa- tion point.

Hot Water Reheat

The solenoid valve opens when the requirement for heating is 100% and closes when the requirement drops below 50%.

SCR Electric Reheat (Requires Special Control Software)

The SCR (Silicon Controlled Rectifier) controller shall proportionally control the stainless steel reheats to maintain the selected room temperature. The rapid cycling made possible by the SCR con- troller provides precise temperature control, and the more constant element temperature improves heater life. During operation of the SCR control, the compressor operates continuously. The heaters are modulated to provide temperature control.

On units equipped with SCR Reheats, unit operation can be controlled even further with DIP switch #7 on the control board. With DIP switch #7 in the “OFF” position, or “Tight Control,” the compressor is locked on and the SCR Reheats are modulated for very tight temperature control. In the event of a malfunction of the SCR Reheats, the compressor will be turned off if the temperature drops to the Low Temperature Alarm Setpoint. With DIP switch #7 in the “ON” position or “Standard Control,” the compressor will cycle on and off as required to satisfy the requirements for cooling and dehumidi- fication in a similar manner as a standard unit without SCR Reheats, i.e., Temperature Setpoint PLUS Temperature Sensitivity PLUS 1°F. The SCR Reheats are modulated from 0% to 100% as required to satisfy the requirements for heating over a control band from the Temperature Setpoint MINUS the Temperature Sensitivity MINUS 1°F.

4.2Humidity Control

4.2.1Dehumidification/Humidification Required, in Percent

The humidity control program for the Advanced Microprocessor is based on a calculated % require- ment for dehumidification/ humidification.

4.2.2Response to Control Types Proportional Control

The % requirement is determined only by the difference between the return air humidity and the humidity setpoint. As the return air humidity rises above the humidity setpoint, the % dehumidifica- tion required increases proportionally from 0 to 100% over a humidity band equal to the humidity sensitivity setting. The converse is true for % humidification requirement.

PID Control (Chilled Water or SCR Reheats only)

If PID control is selected, humidity is controlled in the proportional mode with the sensitivity band being determined by the humidity sensitivity setpoint.

Intelligent Control (Chilled Water only)

If intelligent control is selected, the return air humidity is controlled at or near the humidity setpoint. The % dehumidification/humidification required is calculated based on a set of logical “rules” that simulate the actions of an expert human operator (see 4.3.3 - Intelligent Control (Chilled Water only)).

4.2.3Dehumidification Operation

1-Stage Dehumidification, Compressorized Direct Expansion (DX) Systems

Dehumidification with the standard configuration is accomplished by operating the compressor with- out hot gas bypass active. If system has part coil, dehumidification is accomplished by using only part coil. If the installation has a very light sensible load, dehumidification will be inhibited at the point at which 125% heating would be required to prevent overcooling. Dehumidification would be enabled when the temperature increases to the point where only 50% heating is required.

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Contents Liebert Challenger Page Table of Contents Run Diagnostics Component Operation and Maintenance Alarm DescriptionsHumidifier Figures Page Chilled Water Systems System DescriptionsCompressorized Systems Glycool Chilled Glycol Cooling SystemsStart-Up Procedure Advanced microprocessor control panel BasicsAdvanced microprocessor a control for Challenger Status/Alarm Data Status DisplayMain Menu MENU/ESC Analog Sensors Setpoints/SetupDefault setpoints and ranges Run Hours LogSetup Operation Setup SystemShow DIP Switches Select OptionsCalibrate Sensors Alarm Delay seconds Setup AlarmsAlarm default time delays Default TimeHumidity HUM Control Method Standard Custom Alarm MessagesAnalog Setup Set Status DisplayCalibrate Actuator Test Control Board Run DiagnosticsShow Inputs Test OutputsLCD Display Contrast Change PasswordsDate and Time Control Circuit BoardControl output LEDs DIP SwitchesNon-Volatile Memory Control OutputsOperation with Advanced Microprocessor with Graphics Control Advanced microprocessor with graphics control menu See 3.7.7 Set Status Display View/Set AlarmsSetup Alarms Setup Custom Alarms Setup Water Detect Floor PlanView Water Detect Floor Plan for Optional LTM1000/LT750 View/Set Control Setpoints System SetupCold Start Delay Operating StatusChilled Water/Hot Water/Econ-O-Coil Flush Auto Restart DelayDefault Settings and Ranges IR Flush Overfill infrared humidifiers onlySelect Control Algorithm Chilled Water and SCR Reheats only Calibrate Valve ActuatorSelect Humidity Sensing Mode Run DiagnosticsShow Inputs Setting options Plot GraphsModify Plot Scales View Run Hours Log Analog/Digital InputsView 24 Hour Run Time History View Total Run HoursLCD Contrast Nonvolatile Memory PID Control Chilled Water or SCR Reheats only Temperature ControlCooling/Heating Required, in Percent % Response to Control Types Proportional ControlCooling/dehumidification load status response Glycool CoolingDual Cooling Source Chilled Water CoolingSCR Electric Reheat Requires Special Control Software Humidity ControlHeating Operation Electric Reheat Hot Water ReheatControl Types Humidification Operation System ActivationProportional Control Time between peaks x 5% Short Cycle Control Load Control FeaturesAdditional Features Connecting the Analog SensorsLT750 Environmental Unit Installation-LT750 DIP Switch SettingsFault Water Detection DisplaySetup Physical ConnectionsCalibration Liebert Monitoring Devices and Software CommunicationsChange Filter Standard AlarmsHigh Head Pressure Custom AlarmsHigh Temperature Compressor OverloadLow Temperature High Temperature and Low Temperature SimultaneouslyHumidifier Problem Infrared Humidifiers Loss of PowerOptional/Custom Alarms System Testing Liebert unit Recommended Liquitect location Floor drain FirestatSmoke Detector Water Detection SensorDistance From Unit Zone leak detection kit installation scenariosFilters Remote ShutdownAir Distribution Blower PackageFan Impellers and Bearings BeltSuperheat Refrigeration SystemSuction Pressure Discharge PressureAdjustment Thermostatic Expansion Valve OperationHot Gas Bypass Valve Operation Air Cooled Condenser Outdoor fan/condenser configurationWater/Glycol Cooled Condensers Coaxial Condenser Regulating ValveValve spring guide Adjusting Collar Nut Glycol Solution MaintenanceCompressor Replacement Compressor Functional CheckMechanical Failure Electrical Failure Compressor Replacement ProcedureRemoving the Pan Cleaning the PanHumidifier Infrared HumidifierSteam Generating Humidifier Autoflush Infrared Humidifier Cleaning SystemAutoflush Operation Autoflush ControlsControls Operation200-460 Replacing the CanisterHumidifier canister part numbers Part Capacity Number Voltage Lbs/hr kg/hrDrain Tempering Feature Circuit Board AdjustmentsBlower troubleshooting Chilled water troubleshootingSymptom Possible Cause Check or Remedy Compressor and refrigeration system troubleshooting Compressor and refrigeration system troubleshooting See 6.4.8 Compressor Functional Check and Table Dehumidification troubleshootingGlycol pump troubleshooting Infrared humidifier troubleshootingSteam generating humidifier troubleshooting Reheat troubleshooting Air Cooled Condenser if applicable Filters Steam Generating HumidifierBlower Section CompressorElectrical Panel FiltersWater/Glycol Condenser if applicable Glycol PumpSemiannual Maintenance Inspection Checklist Page That Ne tIti Ti n
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3000 specifications

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