Liebert 3000 manual Reheat troubleshooting

Page 71

Troubleshooting

Table 27 Steam generating humidifier troubleshooting (continued)

Symptom

Possible Cause

Check or Remedy

 

 

 

 

Drain valve clogged or

Verify that drain valve operates freely when activated. Clean

 

valve and replace coil or valve if defective. Flush canister

 

defective

 

several times and replace if arcing persists.

 

 

 

 

 

 

 

If water is commercially softened, reconnect humidifier to

Excessive arcing in the

Improper water supply

raw water supply, drain canister, and restart If connected to

canister

 

hot supply, reconnect to cold water.

 

Insufficient drain rate

Increase drain rate by adjusting % pot on circuit board

 

above the preset 70% to roughly 80%.

 

 

 

Excessive iron content in

Analyze iron content of water. If it exceeds 0.1 mg./l, install

 

water

a filter to remove iron from water supply.

On cold start-up, canister

 

Drain canister and add one Alka-Seltzer tablet to canister.

 

Refill. Turn the % pot to roughly 60%. Restart humidifier. If

fills, high water alarm

 

Conductivity of water too low

amperage rises rapidly, it may be necessary to dilute the

activates and humidifier

 

water to prevent blown fuses. If it rises too slowly, add

fails to reach full amperage

 

 

another Alka-Seltzer tablet.

 

 

 

 

 

On cold start-up, canister

 

If humidifier returns to canister full condition, verity that the

fills, high water alarm

Fill solenoid not closing tightly

activates and humidifier

fill solenoid closes tightly.

 

fails to reach full amperage

 

 

 

 

 

Table 28 Reheat troubleshooting

Symptom

Possible Cause

Check or Remedy

 

 

 

Reheat will not operate;

Control not calling for heat

Check monitor status.

 

 

 

Jumper between terminals P34-1 and P34-2. If reheat operates,

contactor not pulling in

Reheat safety stat open

 

 

safety is open. Remove jumper. Replace safety.

Reheat not operating;

Heater burned out

Turn off power and check heater continuity with Ohm meter.

contactor pulling in

 

 

NOTE:

Reheat element sheaths and fins are manufactured with stainless steel. Regular inspections are necessary to assure proper cleanliness of the reheating element. Should inspection reveal corrosion particles on the reheating element or adjoining surfaces (including ducts and plenums), appropriate cleaning should be performed. Periodic reheating element replacement may be required to meet specific application requirements.

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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 Main Menu MENU/ESC Status/Alarm DataStatus Display Analog Sensors Setpoints/SetupDefault setpoints and ranges Run Hours LogSetup Operation Setup SystemCalibrate Sensors Show DIP SwitchesSelect Options Alarm Delay seconds Setup AlarmsAlarm default time delays Default TimeHumidity HUM Control Method Standard Custom Alarm MessagesCalibrate Actuator Analog SetupSet Status Display 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 View Water Detect Floor Plan for Optional LTM1000/LT750 Setup Custom AlarmsSetup Water Detect Floor Plan 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 Modify Plot Scales Setting optionsPlot Graphs View Run Hours Log Analog/Digital InputsLCD Contrast View 24 Hour Run Time HistoryView Total Run Hours 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 ReheatProportional Control Control TypesHumidification Operation System Activation 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 DisplayCalibration SetupPhysical Connections 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 PressureHot Gas Bypass Valve Operation AdjustmentThermostatic Expansion Valve Operation Air Cooled Condenser Outdoor fan/condenser configurationValve spring guide Water/Glycol Cooled Condensers Coaxial CondenserRegulating Valve Adjusting Collar Nut Glycol Solution MaintenanceMechanical Failure Compressor ReplacementCompressor Functional Check 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 AdjustmentsSymptom Possible Cause Check or Remedy Blower troubleshootingChilled water troubleshooting 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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