Document Outline

• 1.0 Introduction
  • 1.1 System Description
    • 1.1.1 Compressorized Two-Step Systems
      • Cooling
      • Heating
      • Humidification
      • Dehumidification
    • 1.1.2 Compressorized Four-Step Systems
      • Cooling
      • Heating
      • Humidification
      • Dehumidification
    • 1.1.3 Chilled Water Systems
      • Cooling
      • Heating
      • Humidification
      • Dehumidification
    • 1.1.4 GLYCOOL™ (Chilled Glycol Cooling) Systems
      • Cooling
      • Heating
      • Humidification
      • Dehumidification
    • 1.1.5 Dual Source Cooling Systems
      • Cooling
      • Heating
      • Humidification
      • Dehumidification
• 2.0 Initial Start-Up Procedure
  • 2.0.1 Additional Considerations for Upflow Units
• 3.0 Advanced Microprocessor Controls Setup
  • 3.1 Basics
    • Figure 1 Advanced microprocessor control panel
  • 3.2 Display the Main Menu-AM Control
    • Figure 2 Advanced microprocessor (AM) control menu
  • 3.3 Main Menu (AM)-Status/Alarm Data
    • 3.3.1 Active Alarms
    • 3.3.2 Operating Status
    • 3.3.3 Alarm History Log
    • 3.3.4 Run Hours Log
    • 3.3.5 Analog Sensors
  • 3.4 Main Menu (AM)-Setpoints/Setup
    • 3.4.1 View Setpoints Selection
      • Table 1 Default control and alarm setpoints
    • 3.4.2 Setup System Selection
      • Setup Operation
        • Table 2 Setup functions and factory default values
      • Select Options
        • Table 3 Select options
      • Calibrate Sensors
      • Show DIP Switches
        • Table 4 DIP switch settings
      • Select Control Type
      • Setup Alarms
        • Table 5 Alarm default time delay
      • Standard Alarm Messages
      • Humidity Control Method
      • Analog Setup
      • Set Status Display
      • Calibrate Actuator
    • 3.4.3 Run Diagnostics
      • Show Inputs
      • Test Outputs
      • Test Control Board
    • 3.4.4 Change Passwords
  • 3.5 Main Menu (AM)-Date and Time
  • 3.6 Main Menu (AM)-Status Display
  • 3.7 Load Control Features
    • 3.7.1 Short Cycle Control
    • 3.7.2 Sequential Load Activation Control
    • 3.7.3 Compressor Sequencing Control
  • 3.8 Control Circuit Board
    • 3.8.1 LCD Display Contrast
    • 3.8.2 Nonvolatile Memory
    • 3.8.3 DIP Switches
    • 3.8.4 Control Outputs
      • Table 6 Control output LEDs
  • 3.9 Communications
    • Liebert Site Product Device
    • 3.9.1 Monitor functions
    • 3.9.2 View/Change Functions
• 4.0 Advanced Microprocessor with Graphics Control Setup
  • 4.1 Basics
    • Figure 3 Advanced microprocessor with graphics control panel
    • Figure 4 Advanced microprocessor with graphics (AG) control menu
  • 4.2 Display the Main Menu-AG Control
  • 4.3 Main Menu (AG)-Status Display
  • 4.4 Main Menu (AG)-View/Set Alarms
    • 4.4.1 Active Alarms
    • 4.4.2 Alarm History Log
    • 4.4.3 Setup Alarms
      • Table 7 Alarm default time delay
    • 4.4.4 Set Up Custom Alarms
      • Standard Custom Alarm Messages
    • 4.4.5 View Water Detect Floor Plan (for optional LTM1000/LT750)
    • 4.4.6 Setup Water Detect Floor Plan
      • Installation-LT750 DIP Switch Settings
  • 4.5 Main Menu (AG)-Operating Status
  • 4.6 Main Menu (AG)-View/Set Control Setpoints
    • Table 8 Default control and alarm setpoints
  • 4.7 Main Menu (AG)-Setup System
    • 4.7.1 Setup Operation
      • Cold Start Delay
      • Auto Restart Delay
      • IR Flush Overfill (infrared humidifiers only)
      • Chilled Water/Hot Water/Econ-O-Coil Flush
      • Display in Degrees
      • Default Settings and Ranges
        • Table 9 Setup functions and factory default values
    • 4.7.2 Select Options
      • Table 10 Select options
    • 4.7.3 Calibrate Sensors
    • 4.7.4 Calibrate Valve Actuator
    • 4.7.5 Select Control Algorithm
    • 4.7.6 Select Humidity Sensing Mode
    • 4.7.7 Set Status Display
    • 4.7.8 Change Passwords
  • 4.8 Main Menu (AG)-Run Diagnostics
    • 4.8.1 Show Inputs
    • 4.8.2 Test Outputs
    • 4.8.3 Test Control Board
    • 4.8.4 DIP Switches
      • Table 11 DIP switch settings
      • Dehumidification with Normal or Delayed Reheat
  • 4.9 Main Menu (AG)-Date and Time
  • 4.10 Main Menu (AG)-Plot Graphs
    • 4.10.1 Modify Plot Scales
  • 4.11 Main Menu (AG)-Analog/Digital Inputs
    • 4.11.1 Read Analog Inputs
    • 4.11.2 Setup Analog Inputs
      • Slope
      • Intercept
      • Text
    • 4.11.3 Read Digital Inputs
    • 4.11.4 Set Up Digital Inputs
  • 4.12 Main Menu (AG)-View Run Hours Log
    • 4.12.1 View 24 Hour Run Time History
    • 4.12.2 View Total Run Hours
  • 4.13 Load Control Features
    • 4.13.1 Short Cycle Control
    • 4.13.2 Sequential Load Activation Control
    • 4.13.3 Compressor Sequencing Control
  • 4.14 Control Circuit Board
    • 4.14.1 LCD Display Contrast
    • 4.14.2 Nonvolatile Memory
    • 4.14.3 DIP Switches
    • 4.14.4 Control Outputs
      • Table 12 Control output LEDs
  • 4.15 Communications
    • Liebert Site Product Device
    • 4.15.1 Monitor functions:
    • 4.15.2 View/Change Functions:
• 5.0 Response by Control Type-Advanced Microprocessor Controls
  • 5.1 Temperature Control
    • 5.1.1 Cooling/Heating Required, in Percent (%)
    • 5.1.2 Response to Control Types
      • Proportional Control
      • PID Control
      • Intelligent Control
    • 5.1.3 Cooling Operation
      • Two-Step Cooling, Compressorized Direct Expansion (DX) Systems
      • Four-Step Cooling, Compressorized Direct Expansion (DX) Systems)
      • GLYCOOL™ Cooling
      • Dual Cooling Source
      • Chilled Water Cooling
    • 5.1.4 Heating Operation
      • Electric Reheat
      • Hot Water/Steam Heat
  • 5.2 Humidity Control
    • 5.2.1 Dehumidification/Humidification Required, in Percent (%)
    • 5.2.2 Control Types
      • Proportional Control
      • PID Control
      • Intelligent Control
    • 5.2.3 Dehumidification Operation
      • One-Stage Dehumidification, Compressorized Direct Expansion (DX) Systems
      • Two-Stage Dehumidification, Compressorized Direct Expansion (DX) Systems
      • Normal or Delayed Reheat (for Two-Stage Dehumidification Only)
      • Dual Cooling Source Dehumidification
      • Chilled Water Dehumidification
    • 5.2.4 Humidification Operation
      • System Activation
    • 5.2.5 Control Types
      • Proportional Control
      • PID Control
      • Suggested System Tuning Procedure
      • Intelligent Control
  • 5.3 Load Control Features
    • 5.3.1 Short Cycle Control
    • 5.3.2 Sequential Load Activation Control
    • 5.3.3 Compressor Sequencing Control
  • 5.4 Analog Sensors
    • 5.4.1 Connecting the Analog Sensors
      • Table 13 Changing factory-set sensor inputs
      • Table 14 Additional connections available after unit delivery
      • Figure 5 Analog input jumpers
    • 5.4.2 Water Detection Display
      • Figure 6 Connecting the LT750
      • Physical Connections
      • Setup
      • Calibration
  • 5.5 Communications
    • Liebert Site Product Device
    • 5.5.1 Monitor functions:
    • 5.5.2 View/Change Functions:
• 6.0 Alarm Descriptions and Solutions
  • 6.1 Standard Alarms
    • 6.1.1 Change Filter
    • 6.1.2 Compressor Overload
    • 6.1.3 Custom Alarms (Only With Advanced Controls)
    • 6.1.4 High Head Pressure
    • 6.1.5 High Humidity
    • 6.1.6 High Humidity and Low Humidity (Simultaneously)
    • 6.1.7 High Temperature
    • 6.1.8 High Temperature and Low Temperature (Simultaneously)
    • 6.1.9 Humidifier Problem
      • Infrared Humidifiers
      • Steam Generating (Canister) Humidifiers
    • 6.1.10 Loss of Air Flow
    • 6.1.11 Loss of Power
    • 6.1.12 Low Humidity
    • 6.1.13 Low Suction Pressure
    • 6.1.14 Low Temperature
    • 6.1.15 Main Fan Overload
    • 6.1.16 Short Cycle
  • 6.2 Optional/Custom Alarms
    • 6.2.1 Loss of Water Flow
    • 6.2.2 Smoke Detected
    • 6.2.3 Standby GC Pump On
    • 6.2.4 Standby Unit On
    • 6.2.5 Water Under Floor
• 7.0 Component Operation and Maintenance, Checks and Adjustments
  • 7.1 System Testing
    • 7.1.1 Environmental Control Functions
      • Cooling
      • Heating
      • Humidification
      • Dehumidification
      • Proportional Heating/Cooling/ Dehumidification
    • 7.1.2 Electric Panel
      • Control Transformer and Fuses
      • Fan Safety Switch
      • Firestat
      • Smoke Detector
      • Water Detection Sensor
      • Remote Shutdown
  • 7.2 Filters
  • 7.3 Blower Package
    • 7.3.1 Fan Impellers and Bearings
    • 7.3.2 Belts
    • 7.3.3 Electronic Variable Speed Drive (Inverter)
  • 7.4 Refrigeration System
    • 7.4.1 Compressor Oil Level
    • 7.4.2 Suction Pressure
      • Table 15 Suction pressures
    • 7.4.3 Discharge Pressure
      • Table 16 Discharge pressures
    • 7.4.4 Suction Superheat
    • 7.4.5 Thermostatic Expansion Valve
      • Operation
      • Adjustment
    • 7.4.6 Hot Gas Bypass Valve
      • Operation
      • Adjustment
        • Figure 7 Hot gas bypass
    • 7.4.7 Air Cooled Condenser
      • Checking Refrigerant Charge (Lee-Temp™/ Flood Back Head Pressure Control)
        • Figure 8 Outdoor fan/condenser configuration
    • 7.4.8 Water/Glycol Cooled Condensers
      • Shell and Tube Condensers
      • Regulating Valves
      • Adjustment (Johnson Controls/Penn Johnson valves)
      • Testing Function of Valve
      • Glycol Solution Maintenance
    • 7.4.9 Compressor Replacement
      • Mechanical Failure
      • Electrical Failure
      • Compressor Replacement Procedure
  • 7.5 Humidifier
    • 7.5.1 Infrared Humidifier
      • Changing Humidifier Lamps
        • Figure 9 Infrared humidifier lamps
      • Autoflush Infrared Humidifier Cleaning System
      • Autoflush Operation
    • 7.5.2 Steam Generating Humidifier
      • Figure 10 Steam generating humidifier
      • Operation
      • Controls
        • Figure 11 Run/drain switch
      • Replacing the Canister
        • Table 17 Humidifier canister part numbers
        • Table 18 Faults-canister generator humidifier
      • Circuit Board Adjustments
        • Table 19 Steam generating humidifier capacity
        • Figure 12 Steam generating humidifier control board
        • Table 20 DIP switch settings for steam generating humidifier
  • 7.6 Electric Reheat
• 8.0 Troubleshooting
  • Table 21 Blower troubleshooting
  • Table 22 Chilled water troubleshooting
  • Table 23 Compressor and refrigeration system troubleshooting
  • Table 24 Dehumidification troubleshooting
  • Table 25 Glycol pumps troubleshooting
  • Table 26 Humidifier-steam generator troubleshooting
  • Table 27 Humidifier-infrared troubleshooting
  • Table 28 Reheat troubleshooting
• 9.0 Maintenance Inspection Checklist-Monthly
• 10.0 Maintenance Inspection Checklist-Semiannual