Emerson Liebert DS Precision Cooling System 28-105kW User Manuals

Table of Contents

• General Safety Guidelines

  2
• 1.0 Product Description

  5
  • 1.1 General Product Information

    5
    • 1.1.1 Customer-Supplied Equipment and Ductwork

      5
      • Figure 1 Liebert Air Economizer arrangement, typical

        6
  • 1.2 Equipment Inspection

    6
  • 1.3 Equipment Handling

    6
    • 1.3.1 Handle the Liebert Air Economizer With Skid

      7
    • 1.3.2 Move the Liebert Air Economizer With a Forklift

      7
  • 1.4 Unpack the Liebert Air Economizer

    7
• 2.0 Installation

  8
  • 2.1 General Considerations

    8
  • 2.2 Install the Liebert Air Economizer—Preliminary Steps

    8
    • 2.2.1 Position the Liebert Air Economizer on a Liebert CW

      8
      • Secure the Liebert Air Economizer to the Liebert CW

        8
    • 2.2.2 Position the Liebert Air Economizer on a Liebert DS

      9
      • Figure 2 Dimensions—Liebert Air Economizer and Liebert CW models CW106D/114D

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      • Figure 3 Dimensions—Liebert Air Economizer and Liebert CW models CW026D-CW084D

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      • Table 1 Dimensions—Liebert Air Economizer and Liebert CW models CW026D-CW084D

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      • Figure 4 Dimensions—Liebert Air Economizer and Liebert DS downflow units, 28-105kW (8-30 tons)

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      • Table 2 Liebert DS model dimensional data, 28-105kW (8-30 tons)

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  • 2.3 Wiring the Liebert Air Economizer

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    • 2.3.1 Wire the Dampers

      14
      • Figure 5 Damper wiring connections—Liebert DS and Liebert CW units

        14
    • 2.3.2 Outdoor Air and Return Air Temperature and Humidity Sensor Connections

      15
      • Figure 6 Temperature and humidity sensor connections—Liebert DS and Liebert CW

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      • Figure 7 Supply limit thermistor wiring and restricted airflow switch location

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  • 2.4 Adjust the Restricted Airflow Switch

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• 3.0 Installation Checklist

  17
• 4.0 Operation

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  • 4.1 Operational Condition

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    • 4.1.1 Normal Operation

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      • Figure 8 Operational ranges for chilled water systems and for compressor/chilled water systems

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  • 4.2 System Overview

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    • Figure 9 Air flow pattern of a Liebert Air Economizer system

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    • 4.2.1 Out of Service

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      • Figure 10 Liebert DS setpoints screen, page 4 of 6

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      • Figure 11 Service/Economizer, page 1 of 3

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      • Figure 12 Outdoor sensor data screen

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      • Figure 13 Damper settings and limits screen

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    • 4.2.2 Fan Speed Control

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      • Reduced Economizer Air Flow

        26
    • 4.2.3 Variable Speed Fan Operation (VFD and EC Fan)

      26
    • 4.2.4 Disable the Liebert Air Economizer

      26
      • Figure 14 Deactivation switch

        26
  • 4.3 Control Menu Settings

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    • 4.3.1 Liebert Air Economizer Status Screen

      27
  • 4.4 Temperature Control Modes—P and PI

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    • 4.4.1 Proportional Control

      27
    • 4.4.2 Proportional Integral Control

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    • 4.4.3 Integral Wind-up

      27
    • 4.4.4 Controller Tuning

      28
      • Figure 15 Liebert iCOM Wellness menu, page 9

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• 5.0 Maintenance

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• 6.0 Troubleshooting

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  • Table 3 Liebert Air Economizer troubleshooting

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