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Vertiv Liebert DM Series User Manual

Vertiv Liebert DM Series User Manual

Precision air conditioner
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Summary of Contents for Vertiv Liebert DM Series

  • Page 1 Liebert DM Series Precision Air Conditioner User Manual...
  • Page 3 The purchased products, services, and features are stipulated by the contract made between Vertiv Co., and the customer. All or part of the products, services, and features described in this document may not be within the purchasing scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS"...
  • Page 4 Purpose of the Document This document applies to the Liebert DM series of precision air conditioners and cooling solutions which maintain an optimal environmental control mainly for testing laboratories, data center rooms and similar technological ecosystems at minimal operating costs.
  • Page 5  Prior to the installation process, read all the instructions, verify if all the parts are in place, and check the nameplate to ensure that the voltage matches the utility power that is available for that unit. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 6 Using a leak detection system for unit and system supply lines are recommended by Vertiv Co. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 7: Table Of Contents

    1.4.1 Electric Heater ............................. 10 1.4.2 Remote Monitor ............................10 1.4.3 Energy-Saving Card ...........................11 1.4.4 Power SPD................................11 1.5 Working Conditions........................... 11 1.5.1 Operating Environment ..........................12 1.5.2 Storage Environment ..........................13 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 8 2.3.9 Installation Notes Of Connector ..................... 30 2.3.10 Required Pipe Connections....................... 31 2.3.11 Connecting Refrigerant Pipe ......................31 2.3.12 Pipe connector position ........................33 2.3.13 Connecting discharge pipe ....................... 34 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 9 3.2 Micro-Processing Controller..........................52 3.2.1 Features ................................52 3.2.2 Appearance ..............................52 3.2.3 LCD Screen ..............................53 3.2.4 Control Buttons ............................53 3.2.5 Control Buttons Operation Example .................... 54 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 10 4 General Maintenance ................................69 4.1 Electric Inspection ................................ 70 4.2 Indoor Unit Maintenance ............................70 4.2.1 Filter ..................................70 4.2.2 Fan ..................................72 4.2.3 Drain Pipe................................. 72 4.2.4 Heater ................................. 72 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 11 APPENDIX 1 - Crcuit Diagrams ............................ 86 APPENDIX 2 Menu Structure ............................87 APPENDIX 3 Parameter Setting Table........................88 APPENDIX 4 - RDU-Cooling AC Single-Unit Manager Software Introduction ......91 APPENDIX 5 - Hazardous Substances List......................94 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 12: General Information

    PART I GENERAL INFORMATION Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 13: Introduction

    1 Introduction The Liebert DM series is the next generation series of small air conditioners that provide precise environmental control. The Liebert DM models are the latest in the long line of modern enterprise- grade products from the Liebert family. Incorporating the high standards associated with the Liebert name, the DM series utilizes the latest technology, system components, and a streamlined manufacturing process.

  • Page 14: Model Nomenclature

    Figure 1-1 shows the appearance of various models in the Liebert DM series: Figure 1-1 1.1 Model Nomenclature The model nomenclature of the Liebert DM AC is shown in Figure 1-2: Figure 1-1 1.2 Basic Performance Parameters The basic performance parameters of the Liebert DM AC are given in Table within Listing 1.1.

  • Page 15: Product Description

    Liebert DM AC is designed to comply with mission-critical requirements and ensure that servers are maintained at the correct temperature and humidity levels. Figure 1-3 shows the various components and their respective locations: Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 16: Compressor

    Its compactness, smooth compression with scroll operation and high energy efficiency ratio makes it an ideal compressor to bank on for the DM series. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 17: Evaporator

    The thermal expansion valve controls the amount of refrigerant flow into the evaporator thereby controlling the superheat at the outlet of the evaporator. Liebert DM consists of a thermal expansion Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 18: Micro-Processing Controller

    Figure 1-7 depicts the panel of the Microcontroller: Figure 1-7 1.3.5 Strainer The Strainer filters the impurities generated during long-term system operation and ensures normal system operation. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 19: Filter

    The Liebert range of air-cooled condensers offers many advantages, including sharp design, antirust aluminum cabinets, low sound levels, and reliable operations over a wide range of ambient conditions. Figure 1-9 depicts the image of a condenser: Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 20: Sight Glass

    The infrared humidifier consists of infrared humidifier lamp, water injection valve, humidifying water dish, temperature alarm protection devices and water level alarm device. The infrared humidifier in the Liebert DM series provides quicker and more responsive operation which is quite important for mission-critical applications. These humidifiers reduce the dependency of water quality and simultaneously achieve full capacity in quick time using almost any water quality.

  • Page 21: Optional Components

    Lower maintenance and smooth functioning make it an important utility in Liebert DM AC models. Figure 1-11 shows an image of the Electric Heater: Figure 1-11 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 22: Remote Monitor

    It can be easily maintained and provides status indicating and alarm function. 1.5 Working Conditions In this section, take a look at the environmental conditions including the Operating and Storage environment. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 23: Operating Environment

    Note: [1]: For the equivalent lengths of parts, refer to Listing 2.5 [2]: The value is positive if the outdoor unit is installed above the indoor unit; negative if the indoor unit is installed above the outdoor unit Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 24: Storage Environment

    The low quality or counterfeit refrigerant will damage the system severely. Please use the refrigerant approved by Vertiv Co., Ltd. For the system abnormality or damage caused by using other brands of refrigerant, Refer the table in listing 1.5 for the refrigerant brands approved by Vertiv Co., Ltd.
  • Page 25 Part II INSTALLATION Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 26: Installation

    In the previous Figure 2-1, the air conditioner is lifted using the forklift truck and is aligned with the center of gravity. While moving the indoor unit, the obliquity has to be maintained at an angle of 75° to 105°. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 27: Unpacking

    Initially, remove the top cover and winding stretch film. Next, remove the honeycomb cardboard as depicted in Figure 2-3. Figure 2-3 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 28: Inspection

    If any parts or components are missing or damaged, immediately report to the carrier about the same. If hidden damages are observed, then contact the local offices of that carrier as well as Vertiv Co., at the earliest. 2.2 Installation Preparation (Site Preparation) The Liebert DM AC series of air conditioners is streamlined for maintaining a favorable environment for data centers, computer rooms, and similar ecosystems.

  • Page 29: Installation Space Requirements

     All the doors and windows should be properly sealed to minimize the leakage and the seams should be as narrow as possible. Vertiv Co. recommends that the site preparation is defined as per the requirements. However, if these requirements are not met, rectifications must be made on the site so that it complies with the specified requirements and conditions.
  • Page 30 • Do not install additional devices (such as smoke detectors) over the cabinet for facilitating routine maintenance. The following Figure 2-5 depicts the installation location of the indoor unit. Recommended location Not recommended location Figure 2-5 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 31: Installation Tools

    The tools mentioned in listing 2.1 are generic and commonplace; however, depending on various factors such as site environment, cables, installation equipment, and on-site electrical connections these tools may vary in a real-time scenario. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 32: Mechanical Installation

    2.3.1 System arrangement during installation The system general arrangement diagram is depicted in Figure 2-6. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 33  Vertiv Co. staff and qualified professionals lay out the piping in the laboratory.  Piping is done by technicians.  Components (marked with *) are not supplied by Vertiv Co. but are recommended for proper circuit operation and maintenance.

  • Page 34: System Installation Mode

    (to water tap) tube floor Sealed Discharge pipe (slope) Insulation Floor Condensation water material drain pipe (to outdoor) 1:200 1:200 Figure 2-7 Outdoor unit above indoor unit Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 35: Product Dimensions

    The dimensions and weight of the indoor unit are displayed in Figure 2-9 and in the table within Listing 1975 1850 DME07kW DME12kW Figure 2-9 Dimensions of indoor unit (unit: mm) Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 36: Outdoor Unit

    The mechanical parameters of the outdoor unit are shown in Figure 2-10, 2-11 and Table 2.3 2-10 Dimensions of standard outdoor unit (unit: mm) Figure 2-11 Dimensions of Low-Temp outdoor unit (unit: mm) Listing 2.3 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 37: Indoor Unit Installation

    × × Installation hole for Steel plate (60 60 4) × × expansion bolt (M6 50) × Figure 2-13 Mounting base of DME12kW indoor unit Mounting base (unit: mm) Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 38: Outdoor Unit Installation

     Place the outdoor unit on the base.  Secure the outdoor unit onto the base with expansion bolts. The installation hole size of the base is shown in Figure 2-15 and Figure 2-16. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 39 Figure 2-15 Installation hole dimensions of standard outdoor unit base (top view, unit: mm) 1037 Figure 2-16 Installation hole dimensions of Low-Temp outdoor unit base (top view, unit: mm) Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 40: Piping For Ac Unit

     Always consult Vertiv Co. before installation on the measures such as, using extended piping kit are needed, if the equivalent length exceeds 30m, or if the vertical distance between the indoor unit and the outdoor unit exceeds the values as mentioned in Table within Listing 2.4.

  • Page 41: Installation Notes Of Connector

    Two wrenches must be used to cooperate with each other during connection because using one wrench can damage the coupling copper lines easily. The recommended torque values are mentioned in Table within Listing 2.6. Listing 2.6 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 42: Required Pipe Connections

    1. The indoor unit and outdoor unit should be determined based on the specifications mentioned in Table within listing 2.7. If longer pipes are required, contact Vertiv Co. or the concerned sales agency. 2. The liquid pipe is the refrigerant liquid pipe of the outdoor unit outlet. Thereby, a reasonable pipe diameter and length should be selected for the liquid pipe to ensure that the pressure drop of the refrigerant liquid through the pipe during unit operation does not exceed 40kPa (5psi ~ 6psi).
  • Page 43 1. A pipe extension kit is required for ‘Eq.Lgth’ marked with *. 2. D: discharge line, L: liquid line. 3. Consult Vertiv Co. if the pipe length exceeds 50m. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 44: Pipe Connector Position

    Humidifier water supply pipe Connector 7/8 ″ -22mm thread 1/4 ″ copper nut connector 1/4 ″ ×1/2 ″ thread B amplified Pipe connectors inside DME12kW indoor unit Figure 2-18 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 45: Connecting Discharge Pipe

    Connect one end of the liquid pipe to the liquid pipe connector of the indoor unit (shown in Figure 2- 18) and the other end to the liquid pipe connector of the outdoor unit. (shown in Figure 2-19). Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 46: Connecting Drain Pipe Of Indoor Unit

    To protect partial components from damaging and distorting due to bumping, impact and resonation; fasteners and vibration absorbers are mounted at certain locations before delivery. Remove the fasteners and vibration absorbers before the installation and commissioning. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 47: Adding Refrigerant For Long Pipe System

    Refer Table within listing 2.8 for the adding refrigerant amount per meter of liquid pipe with different OD liquid pipes. Total length of extended liquid pipe (m) = total length of liquid pipe (m) - 5m. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 48: Check List

    After installation, foreign materials in and around the equipment are removed (such as shipping materials, construction materials, tools, and so on) Rotate the fan blades with the hand; the fan rotates freely without unusual noise Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 49: Electrical Installation

    The air conditioners in the Liebert DM series are professional devices used in industrial, commercial, or other professional occasions. It is not tailored for the general public. The total rating power is larger than 1 kW and is in with the IEC61000-3-12 standard.

  • Page 50: Connecting Power Cable Of Indoor Unit

    Lead the power cable through the cabling hole, connect it to the power output terminal of the indoor unit, and fasten it with a cable clamp, as shown in Figure 2-22. Connect the other end to the AC power outside the AC system. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 51: Connecting Power Cable Of Outdoor Unit

    The standard length of the outdoor unit power cable is 8m, if a longer cable is required, contact Vertiv Co. The recommended cable size is not less than 18AWG (0.75mm2). Connect one end of the outdoor unit power cable to the power output terminal of the indoor unit (shown in Figure 2-22) and the other end to the power connection terminals of the outdoor unit (shown in Figure 2-23 and Figure 2-24).

  • Page 52: Connecting Control Terminals

    A: Power connection Figure 2-24 2.5.5 Connecting Control Terminals The control terminals are located on the PCB and terminal block of the electrical control box, as shown in Figure 2-25. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 53 PCB 7.5KW single cooling unit 7.5KW humidification unit Control terminals on the terminal block Control terminals on the PCB 12KW cooling unit Figure 2-25 Control terminal position Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 54: Remote Shutdown

    AC unit will stop outputting. The remote shutdown terminal has been shorted before delivery. If the control cable of remote shutdown needs to be connected onsite, remove the short cable and connect the outer controller to the remote shutdown terminal. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 55 The AC system will generate an audible alarm and LCD screen on the micro-processing controller will display the corresponding alarm information. If a computer using Vertiv Co. host monitoring software is connected, then the alarm will be displayed on that computer too.

  • Page 56: Connecting Monitoring Port Cable

    2-26), uses a twisted-pair communication cable to connect it to the upper machine. Multiple Liebert DM AC's can recognize simultaneous multi-units monitoring through RS485 bus. Taking RDU-Cooling host monitoring software developed by Vertiv Co. for example, Figure 2-29 introduces to a networking mode of RS485 bus monitoring two AC units simultaneously.
  • Page 57  Enter Sleep Mod menu to view whether the temperature of the energy-saving card is normal.  Figure 2-22 and Figure 2-23 indicates the connection modes of a single card and multi-cards respectively. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 58: Checklist

    The control connections are completed. All wiring and connector connections are tight. The fixing bolts are tight. After confirming the preceding points, start the start-up inspection & function testing. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 59 Dressing & proper routing condenser cable Condenser cable & copper pipes are tagged with unit No & circuit Sufficient fresh air for condenser No hot air short cycling for condenser Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 60 Fresh water head pressure maintained of 21 - 100 PSI & with PPM level of 80 to 300 (optional) Ensure no leakage in the humidifier & drain piping before Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 61: Part Iii - System Operation & General Maintenance

    PART III SYSTEM OPERATION & GENERAL MAINTENANCE Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 62: System Operation

    Water supply pipe and drain pipe are connected; water level applicable) sensor is secured correctly Heater (if Heating components are secured reliably applicable) Power SPD (if The module is secured reliably applicable) Controller The wiring connections are tight Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 63: Micro-Processing Controller

     The expert-level fault diagnoses system can automatically display the current fault information to facilitate maintenance personnel in equipment maintenance.  Store up to 200 historical alarm records.  Configured with an RS485 port. 3.2.2 Appearance Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 64: Lcd Screen

    Menu screen. The selected menu item will be highlighted while browsing. The digit to be changed will be highlighted while the user is changing the settings. 3.2.4 Control Buttons The micro-processing controller provides five control buttons, as depicted in Figure 3-3 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 65: Control Buttons Operation Example

     Press the Up and Down button to change the current password number.  Press the Enter button to confirm the password following which the Main Menu screen is populated on the controller screen. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 66: On Screen

    After the AC unit is powered on, the language screen will be displayed after 10 seconds (default) for choosing the language or through pressing the Enter button directly, as shown in Figure 3-5. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 67: Normal Screen

    00:00 Figure 3-6 3.2.9 Password Screen Press the Enter button on the Normal screen following which the Password screen appears as depicted in Figure 3-7. Password: 1*** Figure 3-7 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 68: Function Testing

    3.3 Function Testing The AC unit carries hazardous voltage. Cut off the power before testing the equipment. The test should be done under the guidance of Vertiv Co.'s professional maintenance personnel or trained service personnel. 3.3.1 Cooling The temperature set point should be adjusted based on the Set Points (Refer section 3.4.3)

  • Page 69: Heating

    Restore the humidity set point to the default or the original value after the test 3.3.5 Checking Refrigerant Charge Capacity of Low-Temp Outdoor The Low-Temp outdoor unit has been charged with refrigerant before delivery. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 70: Micro-Processing Controller Menu Options

    Appendix - 3 Parameter Setting Table. <Alarm Menu> <Help Menu> <Set Points> <Display Setting> <System Status> <System Menu> Figure 3-8 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 71: Alarm Menu

    Press the Up and Down button to scroll up or down the menu items. Figure 3-8 depicts the Alarm Menu screen: <Alarm Status> <Alarm History> <Alarm Setting> Figure 3-9 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 72: Alarm Status

     Press the Up or Down button to scroll through the historical alarm records if more than one alarm is activated.  Up to 200 historical alarm records can be stored. They will not be cleared upon system power-off. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 73: Alarm Setting

    HP LOCK Overvoltage Phase rev Customer 1 Customer 2 Customer 2 Customer 1 Press Snsr General Alm Hum Snsr T/ H Card ClearAlmHis Air Loss AirLoss Snsr Figure 3-12 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 74: Set Points

    3.4.4 System Status On the Main Menu screen, the user can select the System Status option to gain access to the System Status menu as depicted in Figure 3-14. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 75 The Time/Date screen displays the current time and date of the system in the Year/Month/Date format and Hour/Minute/Second, as depicted in Figure 3-16. Year 2012 Month Second Hour Figure 3-16 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 76 Users can view the start and stop records of important components using this facility. Select the On/Off Record item on the Run Records screen following to access its menu. Figure 3-19 depicts the On/Off Record screen: <Evap Fan> Evap Fan <Compressor> 2012/01/01 00:00 <Heater> 2012/01/01 00:00 <Humidifier> Figure 3-19 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 77: System Menu

    As the Factory Reset will clear all set points configured by the user and the AC unit will be turned off, always be cautious to use it. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 78: Help Menu

    The Change Password settings will not be affected in case of power failure. The menu screen is depicted in Figure 3-24. Level 1 **** Level 2 **** Figure 3-24 3.4.6 Help Menu Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 79: Display Set

    On the Main Menu screen, the user can select the Display Set option to gain access to the Display Set screen as depicted in Figure 3-27. Contrast Language English Figure 3-27 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 80: General Maintenance

     Follow all the local codes, protocols, and regulations prior to maintenance.  Read all the instructions to verify that all the parts are included and check the nameplate to ensure that the voltage matches the available utility power Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 81: Electric Inspection

    In order to maintain efficient operation, the filter should be checked monthly and replaced or washed as recommended. The filters of the indoor unit are installed on the front door and side panel. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 82  Unscrew (do not remove) the fixing screws on the filter stator and move the stator along the guide rail.  Take out the filter on the side panel, as depicted in Figure 4-2. Figure 4-2 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 83: Fan

    The heater elements will heat continuously in the normal station. Inspection of the heater should be carried out bi-annually for its normal operation. If in case the heater needs to be replaced, please contact the Vertiv Co. maintenance personnel. The heater cable must be leaded through the thimble socket, and then connected to the heater.
  • Page 84 加湿器水盘 Drainage pipe of humidifier Bracket 加湿器固定支架 加湿器排水管 Fixing screws between bracket and water tray 加湿器水盘与固定支架之间的固定螺丝 注水电磁阀 Water supply solenoid valve Water supply pipe of humidifier 加湿器进水管 Figure 4-3 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 85: Power Spd

    4.2.6 Power SPD The position of the power SPD is depicted in Figure 4-5. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 86 The power SPD has four status indicators, as depicted in Figure 4-6. The status indicators are green during normal operation; they turn to red upon failure. Status indicator (4 pcs) Status indicator (4 pcs) ALARM ALARM 1-ph power SPD 3-ph power SPD Figure 4-6 Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 87: Thermal Expansion Valve

    Low pressure 57.5 ~ 99.8 0.397 ~ 0.67 Low-pressure setpoint 0.138 Low-pressure recovery point 36.3 0.25 High pressure 180 ~ 275 1.242 ~ 1.895 High-pressure setpoint 2.76 High-pressure recovery point Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 88: Compressor

     Reclaim the residual refrigerant by using standard reclaiming procedures. Releasing of refrigerant to the atmosphere is harmful to the environment. Refrigerant must be recycled in accordance with state and local regulations. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 89: Outdoor Unit Maintenance

    0.85Mpa, the heating belt preheats the fluid reservoir. If there is no heating, check whether the fuse of the heating belt is blown or if the pressure switch is working normally. After confirming the fault part(s), replace them. Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 90: Maintenance Inspection Checklist

    Drain system Check and clean out unit drain pipes, (including humidifier and tray, condensate condensate pump) pump and building drain pipes Semi- Signs of oil leaks Compressor annually Vibration isolation Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 91 Check for the liquid level of the refrigerant in fluid reservoir and leak Low-Temp low- of the fluid reservoir fittings temperature unit Check whether the heating belt of the fluid reservoir works normally Notes: Signature: Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 92: Troubleshooting

    Plugged strainer Clean or replace the strainer Use suction and discharge pressure gauge to check the pressure. View Low refrigerant charge whether evident bubbles exits through the sight glass Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 93 Check the connection between control control board and display and equipment board and display board board interrupted has no output Low-pressure Refrigerant leakage Check for leaking place and re-charge Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 94 Check the state of the high water-level ineffective switch and water level regulator Check that the water supply pipe is not clogged The humidification Check if the contactor voltage is normal Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...
  • Page 95 Check L1, L2 and L3 voltages are normal Humidifier main power when the contactor is energized. failure Check if the manual reset switch of humidifier is disconnected. Infrared humidifier lamp Replace the lamp burned Vertiv | Liebert DM Series Precision Air Conditioner | User Manual...

  • Page 96: Appendix 1 - Crcuit Diagrams

    8、版本代码为T的机组标配电源防雷器；版本代码为P的机组无电源防 雷器及相关电缆，控制板J19-1和J19-2用电缆短接。 /Version code T models with Powe r SPD, Version code P models wit hout Power SPD and relate cables ,connect J19-1 and J19-2 with a short connection cable. Vertiv | Liebert DM series Air Conditioner | User Manual...
  • Page 97 APPENDIX 2 Menu Structure Vertiv | Liebert DM series Air Conditioner | User Manual...

  • Page 98: Appendix 2 Menu Structure

    NTC0 Cal 0.0°C -10°C ~ +10°C Manual En Y, N System Evap Fan ON, OFF Status Compressor ON, OFF I/O Status Heater ON, OFF Humidifier ON, OFF LowFanSpeed ON, OFF Vertiv | Liebert DM series Air Conditioner | User Manual...
  • Page 99 Heater Qty 0, 1 Menu Optional Func Hum Qty 0 、 IF Optional Economy Mode OFF, ON Func_CostS Start at 22:00 18:00 ~ 3:00 End at 7:00 5:00 ~ 10:00 Vertiv | Liebert DM series Air Conditioner | User Manual...
  • Page 100 System Mode SIGL SIGL, HOST, SPAR Optional Switch Mode STDB STDB, ROTA Func_Stand Rotate Freq 1DAY ~ 7Day Rotate at 12:00 0:00 ~ 23:00 Level 1 0001 ~ 9999 Password Vertiv | Liebert DM series Air Conditioner | User Manual...

  • Page 101: Appendix 4 - Rdu-Cooling Ac Single-Unit Manager Software Introduction

    APPENDIX 4 - RDU-Cooling AC Single-Unit Manager Software Introduction The RDU-Cooling manager is a monitoring system developed by Vertiv Co., Ltd. to perform monitoring and management over the Liebert DM air conditioner designed by Vertiv Co. The WEB browser can be used to log in the RDU-Cooling manager to perform monitoring and management over the Liebert DM AC.
  • Page 102 Monitoring information of the device; perform remote control and adjustment over the device Alarm This menu allows you to query the real-time alarms and Vertiv | Liebert DM series Air Conditioner | User Manual...
  • Page 103 For detailed descriptions of RDU-Cooling, refer to RDU-Cooling Air- Conditioner Single-Unit Manager User Manual. This manual is installed together with the software on the computer, and the user can find it through the Online Help menu. Vertiv | Liebert DM series Air Conditioner | User Manual...

  • Page 104: Appendix 5 - Hazardous Substances List

    X: Means the content of the hazardous substances in at least one of the average quality materials of the part is outside the limits specified in SJ/T11363-2006 Vertiv Co., Ltd. has been committed to the design and manufacturing of environment-friendly products. It will reduce and eventually eliminate the hazardous substances in the products through unremitting efforts in research.
  • Page 105 Environment Protection Period starting from the manufacturing date. Applicable product: Liebert DM Air cooled series precision air conditioner outdoor unit Vertiv | Liebert DM series Air Conditioner | User Manual...
  • Page 107 VertivCo.com VertivCo.com Block B2, Nanshan I Park, No.1001 Xueyuan Road, Nanshan District, Shenzhen 518057 PR China...

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