Emerson DE, VH, VE, DH Electric Panel, Control Transformer and Fuses, Fan Safety Switch, Firestat

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Component Operation and Maintenance, Checks and Adjustments

7.1.2Electric Panel

The electric panel should be inspected for any loose electrical connections.

! WARNING

Be sure that power to the unit is shut down before attempting to tighten any fittings or connections.

Control Transformer and Fuses

The control system is divided into four (4) separate circuits. Fuses located on the transformer/fuse board individually protect the control voltage circuits. If any of the fuses are blown, first eliminate shorts, then use spare fuses supplied with unit. Use only type and size of fuse specified for your unit.

The small isolation transformer on the main control board supplies 24 volts to the electronics. The transformer is internally protected. If the internal protector opens, the transformer/fuse board must be replaced. Also check the control voltage fuse on the main control board before replacing the trans- former/fuse board.

Fan Safety Switch

For Deluxe units, the Fan Safety Switch is located in the low voltage compartment and consists of a diaphragm switch and interconnecting tubing to the blower scroll. The Fan Safety switch is wired directly to the control circuit to deactivate the unit and activate the alarm system if airflow is inter- rupted.

Firestat

The optional firestat is a bimetal operated sensing device with a Normally Closed switch. This device will shut down the entire unit when the inlet air temperature exceeds a preset point. It is connected between terminals 1 and 2 at plug P39.

Smoke Detector

The optional smoke detector power supply is located on the base of the upflow units, and at the top of downflow units. It is constantly sampling return air through a tube. No adjustments are required.

Water Detection Sensor

! CAUTION

Do not use near flammable liquids or for flammable liquid detection.

Liebert manufactures a variety of water-detection systems, including point, zone and cable systems. Follow the instructions supplied with your selected device for proper installation, adjustment and maintenance.

Remote Shutdown

A connection point is provided for customer-supplied remote shutdown devices. Terminals 37 and 38 on the terminal strip are jumpered when no remote shutdown device is installed. Refer to the unit’s electrical schematic and the unit’s installation manual.

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Contents Liebert Deluxe System/3 Page Table of Contents Main Menu AG-Run Diagnostics Temperature Control Alarm Descriptions and SolutionsSystem Testing Figures Page Introduction System DescriptionChilled Water Systems Glycool Chilled Glycol Cooling SystemsDual Source Cooling Systems Additional Considerations for Upflow Units Initial START-UP ProcedureAdvanced Microprocessor Controls Setup BasicsDisplay the Main Menu-AM Control Advanced microprocessor AM control menu Active Alarms Main Menu AM-Status/Alarm DataAlarm History Log Operating StatusSetup System Selection Main Menu AM-Setpoints/SetupDefault control and alarm setpoints Analog SensorsSetup Operation Setup functions and factory default valuesFunction Default Range DIP switch settings Show DIP SwitchesSelect Options Calibrate SensorsSelect Control Type Setup AlarmsAlarm Default Delay seconds Alarm default time delayStandard Alarm Messages Analog SetupHumidity Control Method Set Status Display Run DiagnosticsCalibrate Actuator Show InputsMain Menu AM-Date and Time Change PasswordsTest Outputs Test Control BoardLoad Control Features Main Menu AM-Status DisplayControl Circuit Board Communications DIP SwitchesNonvolatile Memory Control OutputsView/Change Functions Monitor functionsAdvanced microprocessor with graphics control panel Advanced Microprocessor with Graphics Control SetupAdvanced microprocessor with graphics AG control menu Main Menu AG-View/Set Alarms Display the Main Menu-AG ControlMain Menu AG-Status Display Alarm Seconds Default Time DelayStandard Custom Alarm Messages Set Up Custom AlarmsSetup Water Detect Floor Plan Installation-LT750 DIP Switch SettingsMain Menu AG-Setup System Main Menu AG-Operating StatusMain Menu AG-View/Set Control Setpoints Auto Restart Delay Cold Start DelayDefault Settings and Ranges IR Flush Overfill infrared humidifiers onlySelect Control Algorithm Calibrate Valve ActuatorSelect Humidity Sensing Mode Main Menu AG-Run DiagnosticsShow Inputs Dehumidification with Normal or Delayed Reheat Main Menu AG-Date and TimeMain Menu AG-Plot Graphs Main Menu AG-Analog/Digital Inputs Main Menu AG-View Run Hours Log Set Up Digital InputsRead Digital Inputs View 24 Hour Run Time HistoryControl Circuit Board On/Off Status Time View Only Silence Alarm Response by Control TYPE-ADVANCED Microprocessor Controls Temperature ControlDual Cooling Source Glycool CoolingChilled Water Cooling Heating Operation Electric ReheatHot Water/Steam Heat Humidity ControlDehumidification/Humidification Required, in Percent % Control Types Proportional ControlDual Cooling Source Dehumidification Chilled Water DehumidificationHumidification Operation System Activation Suggested System Tuning Procedure Intelligent Control Load Control Features Analog Sensors Connecting the Analog SensorsChanging factory-set sensor inputs Additional connections available after unit deliverySetup Water Detection DisplayPhysical Connections Calibration View/Change Functions Alarm Descriptions and Solutions Standard AlarmsChange Filter Compressor OverloadHigh Temperature Custom Alarms Only With Advanced ControlsHigh Temperature and Low Temperature Simultaneously Humidifier Problem Infrared HumidifiersLow Temperature Loss of PowerLoss of Air Flow Low HumidityOptional/Custom Alarms Component Operation and MAINTENANCE, Checks and Adjustments System TestingEnvironmental Control Functions Proportional Heating/Cooling/ DehumidificationElectric Panel Fan Safety SwitchControl Transformer and Fuses FirestatBlower Package FiltersFan Impellers and Bearings BeltsRefrigeration System Electronic Variable Speed Drive InverterCompressor Oil Level Discharge Pressure Suction PressureSuction Superheat Thermostatic Expansion Valve OperationHot Gas Bypass Valve Operation AdjustmentAir Cooled Condenser Outdoor fan/condenser configurationTesting Function of Valve Adjustment Johnson Controls/Penn Johnson valvesGlycol Solution Maintenance Water/Glycol Cooled Condensers Shell and Tube CondensersCompressor Replacement Mechanical FailureElectrical Failure Compressor Replacement Procedure HumidifierInfrared Humidifier Changing Humidifier Lamps Autoflush Infrared Humidifier Cleaning SystemAutoflush Operation Humidifier lampsSteam generating humidifier Steam Generating HumidifierReplacing the Canister ControlsFaults-canister generator humidifier Humidifier canister part numbersPriority Name LED Indication Description Steam generating humidifier capacity Circuit Board AdjustmentsCapacity Hz Models Lbs/hr kg/hrElectric Reheat Unit Rated Rated Values Voltage CapacityVoltage AMP Set Pt Blower troubleshooting TroubleshootingChilled water troubleshooting Symptom Possible Cause Check or RemedyCompressor and refrigeration system troubleshooting Compressor and refrigeration system troubleshooting Glycol pumps troubleshooting Dehumidification troubleshootingAdjustments on Humidifier-steam generator troubleshootingReheat troubleshooting Humidifier-infrared troubleshootingMaintenance Inspection CHECKLIST-MONTHLY Maintenance Inspection CHECKLIST-SEMIANNUAL Iti Ne tTi n That

VE, DH, VH, DE specifications

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