Liebert 3000 manual Refrigeration System, Suction Pressure, Discharge Pressure, Superheat

Page 54

Component Operation and Maintenance

6.4Refrigeration System

Each month, the components of the refrigeration system should be inspected for proper function and signs of wear. Since, in most cases, evidence of malfunction is present prior to component failure, peri- odic inspections can be a major factor in the prevention of most system failures.

Refrigerant lines must be properly supported and not allowed to vibrate against ceilings, floors or the unit frame. Inspect all refrigerant lines every six months for signs of wear and proper support. Also inspect capillary and equalizer lines from the expansion valve and support as necessary.

Each liquid line has a sight glass that indicates liquid refrigerant flow and the presence of moisture. Bubbles in the sight glass indicate a shortage of refrigerant or a restriction in the liquid line. The moisture indicator changes from green to yellow when moisture is present in the system.

6.4.1Suction Pressure

Suction pressure will vary with load conditions. The low pressure switch will shut the compressor down if suction pressure falls below the cut-out setting. High suction pressure reduces the ability of the refrigerant to cool compressor components and can result in compressor damage. Minimum (pres- sure switch cut-out setting) and maximum (design operating) suction pressures are in Table 18.

Table 18 Suction pressures

 

Minimum

Maximum

 

PSIG (kPa)

PSIG (kPa)

System

R–22

R–22

Air w/FSC

15 (103)

90 (620)

(Fan Speed Control)

 

 

Air w/Lee-Temp Control

20 (137)

90 (620)

(Floodback head

 

 

pressure control)

 

 

Water Cooled

20 (137)

90 (620)

 

 

 

Glycol Cooled

20 (137)

90 (620)

 

 

 

6.4.2Discharge Pressure

Discharge Pressure can be increased or decreased by load conditions or condenser efficiency. The high pressure switch will shut the compressor down at its cut-out setting. Refer to Table 19, below.

Table 19 Discharge pressures

 

 

Discharge Pressure

System Design

PSIG (kPa)

 

 

Air Cooled

260 (1795)

 

 

Water/Glycol Cooled

65-75°F (18-24°C) fluid

210 (1450)

 

 

 

 

85°F (29°C) fluid

225 (1550)

 

 

 

 

115°F (46°C) fluid

295 (2035)

 

 

 

Maximum

330 (2275)

 

 

High Pressure Cut-Out

360 (2482)

 

 

 

6.4.3Superheat

Superheat can be adjusted by the Thermostatic Expansion Value (TEV). To determine superheat:

1.Measure the temperature of the suction line at the point the TEV bulb is clamped.

2.Obtain the gauge pressure at the compressor suction valve.

3.Add the estimated pressure drop between bulb location and suction valve.

4.Convert the sum of the two pressures to the equivalent temperature.

5.Subtract this temperature from the actual suction line temperature. The difference is superheat.

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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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