Liebert 3000 manual Blower troubleshooting, Chilled water troubleshooting

Page 66

Troubleshooting

7.0TROUBLESHOOTING

Use this section to assist in troubleshooting your unit. Also refer to 5.0 - Alarm Descriptions. Sug- gestions are grouped by product function for convenience.

! WARNING

Only qualified personnel should perform service on these units. Lethal voltage is present in some circuits. Use caution when troubleshooting with power on. Disconnect and lock out power before replacing components. Use caution and standard procedures when working with pressurized pipes and tubes.

! CAUTION

When using jumpers for troubleshooting, always remove jumpers when maintenance is complete. Jumpers left connected could override controls and cause equipment damage.

Table 21 Blower troubleshooting

Symptom

Possible Cause

Check or Remedy

 

 

 

Blower will not start

No main power

Check L1, L2 and L3 for rated voltage.

 

 

Blown fuse or tripped circuit breaker (CB)

Check fuses or CBs to main fan.

 

 

 

 

 

Overloads tripped

Push reset button on main fan overload. Check amp

 

 

draw.

 

No output voltage from transformer

Check for 24 VAC between P24-2 and P24-1. If no

 

 

voltage, check primary voltage.

 

Control fuse blown or circuit breaker tripped

Check for 24 VAC between P4-4 and E1. If no voltage,

 

 

check for short. Replace fuse or reset circuit breaker.

Table 22 Chilled water troubleshooting

Symptom

Possible Cause

Check or Remedy

 

 

 

Chilled water or hot

Motor operates but valve won’t open

Check linkage for adjustment and be sure that it is

water/steam valve

 

tight on the valve.

not opening

 

 

 

No 24 VAC power to motor

Check linkage for adjustment and be sure that it is

Modulating Motors

 

tight on the valve.

 

No signal from control

Check DC voltage on printed circuit board in motor.

 

 

Terminal No. 1 is grounded and No. 3 is positive. DC

 

 

voltage should vary from 0.8 to 2.0 VDC or above as

 

 

temperature control is varied below room temperature

 

 

on cooling valve or above room temperature on

 

 

heating valve.

 

Motor not working

Remove wires on terminal No. 1 and No. 3 from the

 

 

motor (do not short). With 24 VAC power from TR to

 

 

TR jumper terminal 1 and 2 on motor to drive open.

 

 

Remove jumper to drive closed, if motor fails to work,

 

 

replace it.

Actuator Motors

No 24 VAC power to motor

Check for 24 VAC between P22-3 and P22-5 (open),

 

 

or P22-1 and P22-5 (closed).

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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 Status/Alarm Data Status DisplayMain Menu MENU/ESC Run Hours Log Setpoints/SetupDefault setpoints and ranges Analog SensorsSetup System Setup OperationShow DIP Switches Select OptionsCalibrate Sensors Default Time Setup AlarmsAlarm default time delays Alarm Delay secondsStandard Custom Alarm Messages Humidity HUM Control MethodAnalog Setup Set Status DisplayCalibrate Actuator 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 Setup Custom Alarms Setup Water Detect Floor PlanView Water Detect Floor Plan for Optional LTM1000/LT750 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 Setting options Plot GraphsModify Plot Scales Analog/Digital Inputs View Run Hours LogView 24 Hour Run Time History View Total Run HoursLCD Contrast 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 SoftwareControl Types Humidification Operation System ActivationProportional Control 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 UnitSetup Physical ConnectionsCalibration 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 SuperheatAdjustment Thermostatic Expansion Valve OperationHot Gas Bypass Valve Operation Outdoor fan/condenser configuration Air Cooled CondenserWater/Glycol Cooled Condensers Coaxial Condenser Regulating ValveValve spring guide Glycol Solution Maintenance Adjusting Collar NutCompressor Replacement Compressor Functional CheckMechanical Failure 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 FeatureBlower troubleshooting Chilled water troubleshootingSymptom Possible Cause Check or Remedy 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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