Liebert 3000 manual Blower Package, Fan Impellers and Bearings, Belt, Air Distribution

Page 53

Component Operation and Maintenance

6.3Blower Package

Periodic checks of the blower package include: belt, motor mounts, fan bearings, and impellers.

6.3.1Fan Impellers and Bearings

Fan impellers should be periodically inspected and any debris removed. Check to see if they are tightly mounted on the fan shaft. Rotate the impellers and make sure they do not rub against the fan housing.

Bearings used on the units are permanently sealed and self-lubricating. They should be inspected for signs of wear when the belt is adjusted. Shake the pulley and look for movement in the fan shaft. If any excessive movement is noticed, bearings should be replaced. However, the cause of the wear must be determined and corrected before returning the unit to operation.

6.3.2Belt

The drive belt should be checked monthly for signs of wear and proper tension. Pressing in on belts midway between the sheave and pulley should produce from 1/2" to 1" (12 to 25 mm) of movement. Belts that are too tight can cause excessive bearing wear.

Belt tension can be adjusted by raising or lowering the fan motor base. Loosen nut above motor mounting plate to remove belt. Turn nut below motor mounting plate to adjust belt tension. If belt appears cracked or worn, it should be replaced with a matched belt (identically sized). With proper care, a belt should last several years.

NOTE

After adjusting or changing the belt, always be certain that motor base nuts are tightened. The bottom adjustment nut should be finger tight. The top locking nut should be tightened with a wrench.

6.3.3Air Distribution

All unit models are designed for constant volume air delivery. Therefore any unusual restrictions within the air circuit must be avoided. Refer to the following table for recommended free area for proper air flow.

Table 17 Recommended free area ft2 (m2) for grilles or perforated panels at output velocities of 550 and 600 fpm (2.8 and 3.1 m/s)

 

550 FPM

600 FPM

Model

(2.8 m/s)

(3.1 m/s)

 

 

 

60 Hz Units

 

 

 

 

 

3 Ton

2.5 (0.22)

2.3 (0.21)

 

 

 

5 Ton

3.8 (0.34)

3.5 (0.33)

 

 

 

50 Hz Units

 

 

 

 

 

3 Ton

2.9 (0.27)

2.6 (0.24)

 

 

 

5 Ton

3.5 (0.33)

3.3 (0.31)

 

 

 

Grilles used in raised floors vary in size, the largest being 18" x 6" (46 cm x 15 cm). This type of grille has approximately 56 in2 (361 cm2) of free area. Perforated Panels are usually 2' x 2' (61 cm x 61 cm) and have a nominal free area of approximately 108 to 144 in2 (697 to 929 cm2).

NOTE

Absolutely avoid any under-floor restrictions such as clusters of cables or piping. Whenever possible, cables and pipes should be run parallel to the air flow. Never stack cables or piping.

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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 Main Menu MENU/ESC Status/Alarm DataStatus Display Default setpoints and ranges Setpoints/SetupRun Hours Log Analog SensorsSetup Operation Setup SystemCalibrate Sensors Show DIP SwitchesSelect Options Alarm default time delays Setup AlarmsDefault Time Alarm Delay secondsHumidity HUM Control Method Standard Custom Alarm MessagesCalibrate Actuator Analog SetupSet Status Display 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 View Water Detect Floor Plan for Optional LTM1000/LT750 Setup Custom AlarmsSetup Water Detect Floor Plan 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 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 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 SoftwareProportional Control Control TypesHumidification Operation System Activation 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 UnitCalibration SetupPhysical Connections 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 SuperheatHot 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 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 AdjustmentsSymptom Possible Cause Check or Remedy Blower troubleshootingChilled water troubleshooting 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

The Liebert 3000 is a cutting-edge power protection solution designed to provide reliable and efficient backup power for critical applications. This uninterruptible power supply (UPS) system is engineered to safeguard sensitive electronic equipment from power disturbances, ensuring uninterrupted operations in data centers, telecommunications, and industrial environments.

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