Vertiv Liebert DM Series User manual

Liebert® DM
User Manual
Precision Air Conditioning

Copyright by Vertiv Co. Ltd.
The content in this document is subject to change without notice. All rights, including rights of translation, reproduced
by printing, copying or similar methods, and even of parts, are reserved. Violators will be liable for damages. All rights,
including rights deriving from patent license or registration of a utility model or design, are reserved. No part of this
document may be reproduced or transmitted in any form or by any means without the prior written consent of Vertiv Co.
Ltd.
Notice
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” without warranties, guarantees or representations of any kind,
either express or implied. The information in this document is subject to change without notice. Every eort has been
made in the preparation of this document to ensure the accuracy of the contents, but all statements, information, and
recommendations in this document do not constitute a warranty of any kind, express or implied.
Vertiv Co., Ltd.
China
Homepage: www.vertiv.com
E-mail: [e-mail]
Customer service hotline: [phone]
Asia Pacific
Homepage: www.vertiv.com.
E-mail: [e-mail]
For Technical Support, users may contact the nearest Vertiv Co. local sales oice or service centre.

Purpose of the Document
This document applies to the series of precision air conditioners and cooling solutions which maintain optimal
environmental control of technological ecosystems at minimal operating costs. This document gives an overview of the
specifications, installation, commissioning, and maintenance procedures with troubleshooting from the user perspective.
The figures used in this document are for reference only.
Please read this manual carefully before installing, maintaining, and troubleshooting.
Vertiv™Liebert® DM precision CRAC is a professional device, only professionals are permitted to access the unit and is kept
in a place where access is restricted to common people.
Styling used in this Guide
The styles used in the manual will be defined as mentioned in the following table:
Situation Description
Warning/Danger/Cauon • The Warning/Danger/Caution note indicates a hazardous or potentially
harmful situation that can result in death or injury. It also indicates in-
structions that need to be adhered to, failing which may result in danger
and safety issues thereby having an adverse eect on the reliability of
the device and security. Even for practices not related to physical injury,
to avoid equipment damage, performance degradation, or interruption in
service, follow the warning instruction, carefully.
Note
• The Note section indicates additional and useful information. It also calls
attention to best practices and industry-best protocols that are
standardized and help make maximum utilization of the resources at
hand. Helpful information related to the product also comes under the
Note heading, helping the users with the definitions, concepts, and
terminologies used in the manual.
Version History
Product Name AC BOM No. EC BOM No. Relese Date Revision No.
DME07 01306112 & 13 01306114 & 15 13/09/2021 V2
DME12 01306122 & 23 01306124 & 25 13/09/2021 V2
DME17 01303763 to 65 -- 13/09/2021 V2
DME22
01304682 & 83; 01304690 to 92;
01304701 -- 13/09/2021 V1
DME27 -- F0128444 & 45 13/09/2021 V1
Product Name BOM No. Relese Date Revision No.
DMC07
01306127 13/09/2021 V2
DMC12
01306129 13/09/2021 V2
DMC17
01303769 13/09/2021 V2
DMC22
01304698 13/09/2021 V1
DMC27
F0128702 13/09/2021 V1

Safety Precautions and Measures
The important safety precautions and measures that should be followed during the installation and maintenance are
described in the following sections.
Read the manual prior to installation and operation of the unit. Only qualified personnel should move, install, or service
this equipment.
Before working on the equipment, the user reads and considers all precautions, compliance and safety measures. The
unit control must be used exclusively for the purpose which it is intended for; the manufacturer takes no liability for
incorrect use or a modification to the unit control.
Adhere to all the Warnings and Cautionary measures included in the manual.
Please read this manual carefully before installing, maintaining and troubleshooting; especially the
Warning/Danger/Caution information in the User Guide. Apart from the User Guide, also pay attention to
the warning labels on the unit and its components.
This manual is retained for the entire service life of the unit. The user must read all the precautions, danger, warnings, and
cautionary measures mentioned in the manual prior to carrying out any operations on the unit. Each unit is equipped with
an electric insulation which allows the users to work in safe conditions. The main switch is positioned on the electrical
panel cover; to access it, open the right door. Before any maintenance operation, switch o the unit with this electrical
insulation device to eliminate risks such as electrical shocks, burns, automatic restarting, moving parts, and remote
control. The panel key, supplied along with the unit, must be kept by the personnel responsible for the maintenance. The
protective covers can be removed after the electric power has been cut o by opening the main switch.
In the following sections, notice the various cautionary measures and warnings that need to be read carefully prior to
installing or operating the system.
Disconnect the local and remote power supplies prior to working with the unit.
Prior to the installation process, read all the instructions, verify if all the parts are in place, and check the nameplate to
ensure the voltage matches the available utility power for the unit.
The controller doesn’t isolate power from the unit even in the O mode, and some internal components still require and
receive power during the O mode.
If the unit door is open while the fans are operating, the airflow may result in abrupt slamming of the door resulting in
injury. Another aspect is the presence of small objects in the fans bay that can result in object ejection during the fan
start-up and there is a probable risk of being hit by these objects resulting in grievous injury and causing equipment
damage.
The unit contains fluids and gases under high pressure. Therefore, the pressure should be relieved before working with
the piping.

Various components such as compressors, refrigerant discharge lines, and humidifiers are extremely hot during the unit
operation. Therefore, allow suicient time for the unit to cool down before working with the unit. Handle the unit with
extreme caution and wear safety gears such as protective gloves, safety shoes, and arm protection while working with the
hot compressors, discharge lines, and reheats.
There is a risk of water leaking that can damage both the equipment and the building. Eective water drain connection and
facilities should be available. Installation should be precise. Implementation of the application and service practices should
be appropriate and fault-free. Failure to comply with these norms will result in water leakage from the unit. Water leakage can
lead to massive damage and loss of critical equipment in the hosting ecosystem. Therefore, care should be taken to ensure
that the unit is not located directly above any equipment that could sustain damage due to water and excessive moisture.
Use of a leak detection system for the unit and system supply lines are recommended by Vertiv Co.

Vertiv™ | Liebert® DM | User Manual i
Table of Contents
Table of Contents
Chapter 1: Overview..........................................................................................................................................................................................................1
1.1. Product Introduction................................................................................................................................................................................................. 1
1.1.1. Indoor unit................................................................................................................................................................................................................1
1.1.2. Outdoor unit........................................................................................................................................................................................................2
1.2. Model Description .....................................................................................................................................................................................................4
1.3. Basic Performance Parameters..................................................................................................................................................................... 5
1.4. Main Components..................................................................................................................................................................................................... 5
1.4.1. Indoor Unit ............................................................................................................................................................................................................5
1.4.2. Outdoor Unit......................................................................................................................................................................................................9
1.5. Optional Components..........................................................................................................................................................................................10
1.5.1. Infrared Humidifier .....................................................................................................................................................................................10
1.5.2. Electrical Heating.........................................................................................................................................................................................11
1.5.3. Communication Protocol......................................................................................................................................................................11
1.5.4. Monitoring...........................................................................................................................................................................................................11
1.5.5. Energy-saving Card...................................................................................................................................................................................12
1.5.6. Power SPD..........................................................................................................................................................................................................12
1.5.7. Floor Leak Detection Sensor ............................................................................................................................................................12
1.5.8. Installation Accessories ........................................................................................................................................................................12
1.6. Environmental Conditions Requirements.........................................................................................................................................13
1.6.1. Operating Environment Requirements ...................................................................................................................................13
1.6.2. Storage Environment Requirements....................................................................................................................................... 14
1.7. Refrigerant Charging Requirement .........................................................................................................................................................14
Chapter 2: Mechanical Installation...............................................................................................................................................................15
2.1. Unpacking and Inspection...............................................................................................................................................................................15
2.2. Installation Notes.....................................................................................................................................................................................................15
2.3. System Installation Arrangement ............................................................................................................................................................15

Vertiv™ | Liebert® DM | User Manual ii
Table of Contents
2.3.1. System Arrangement during Installation..............................................................................................................................15
2.3.2. System Installation Mode...................................................................................................................................................................17
2.4. Mechanical Installation......................................................................................................................................................................................19
2.4.1. Dimension and Weight of the Indoor Unit (Product Dimension)................................................................. 19
2.4.2. Dimension and Weight of the Outdoor Unit.....................................................................................................................21
2.5. Installing Indoor Unit ........................................................................................................................................................................................... 22
2.5.1. Equipment Room Requirements .................................................................................................................................................22
2.5.2. Installation Space Requirements...............................................................................................................................................23
2.5.3. Installation Procedure...........................................................................................................................................................................24
2.6. Installing Outdoor Unit......................................................................................................................................................................................25
2.6.1. Installation Notes........................................................................................................................................................................................25
2.6.2. Installation Procedure...........................................................................................................................................................................26
2.6.3. Refrigeration Piping Connection General Principles..............................................................................................29
2.6.4. Quick Thread Connector Installation Notes ..................................................................................................................30
2.6.5. Piping Connection Requirements............................................................................................................................................30
2.6.6. Connecting Refrigerant Piping......................................................................................................................................................31
2.6.7. Pipe Connector Position......................................................................................................................................................................33
2.6.8. Connecting Drain Piping Of Indoor Unit............................................................................................................................ 39
2.6.9. Humidifier and Water Supply Piping Connection (If Applicable) ..............................................................40
2.7. Removing Transport Fasteners and Shock Absorbers...................................................................................................... 40
2.8. Charging Refrigerant............................................................................................................................................................................................41
2.8.1. Base Charging of Refrigerant.......................................................................................................................................................... 41
2.8.2. Adding Refrigerant For Long Piping System .................................................................................................................42
2.8.3. Long Connecting Pipe System with Lubricant Oil (RL32-3MAF)............................................................. 43
2.9. Installation Inspection .......................................................................................................................................................................................44
Chapter 3: Electrical Installation...................................................................................................................................................................45
3.1. Task Introduction.....................................................................................................................................................................................................45
3.1.1. Cables to Connect On-site................................................................................................................................................................. 45

Vertiv™ | Liebert® DM | User Manual iii
Table of Contents
3.2. Installation Notes....................................................................................................................................................................................................45
3.3. Indoor Unit Power Cable Connection..................................................................................................................................................46
3.4. Connecting Power Cable of Outdoor Unit......................................................................................................................................50
3.5. Control Cable Connections........................................................................................................................................................................... 52
3.5.1. Connecting Control Terminal..........................................................................................................................................................52
3.5.2. The Outdoor Unit Signal Cable Connection (for 22 kW/27 kW) ................................................................. 58
3.5.3. Connecting the Monitoring Interface Cable................................................................................................................... 58
3.5.4. Energy-Saving Card Connection............................................................................................................................................... 59
3.6. Notes on Installing and Using the Energy-saving Card.................................................................................................... 60
3.7. Electrical Installation Inspection................................................................................................................................................................61
Chapter 4: Start-up Commissioning..........................................................................................................................................................62
4.1. Start-Up Inspection...............................................................................................................................................................................................62
4.2. Function Testing.....................................................................................................................................................................................................63
4.2.1. Cooling................................................................................................................................................................................................................. 63
4.2.2. Heating..............................................................................................................................................................................................................64
4.2.3. Humidifying ...................................................................................................................................................................................................64
4.2.4. Dehumidifying.............................................................................................................................................................................................64
Chapter 5: Microprocessor Controller.....................................................................................................................................................65
5.1. Features.............................................................................................................................................................................................................................65
5.2. Appearance..................................................................................................................................................................................................................65
5.3. Control Interface......................................................................................................................................................................................................66
5.3.1. Color Screen Main Interface............................................................................................................................................................66
5.3.2. Password Screen ...................................................................................................................................................................................... 70
5.4. Menu Structure.......................................................................................................................................................................................................... 71
5.4.1. Main Menu..........................................................................................................................................................................................................71
5.4.2. Run Information..........................................................................................................................................................................................72
5.4.3. Temp/Hum Setting..................................................................................................................................................................................73

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Table of Contents
5.4.4. Alarm Information.....................................................................................................................................................................................74
5.4.5. Parameter Settings..................................................................................................................................................................................75
5.4.6. Temperature and Humidity Graph ..........................................................................................................................................80
5.4.7. About....................................................................................................................................................................................................................80
Chapter 6: Outdoor Fan Speed Controller (Only for 22 kW/27 kW) .......................................................................82
6.1. Cabling of the Terminals...................................................................................................................................................................................82
6.2. Human-Machine Interface............................................................................................................................................................................84
6.3. Human-Machine Interface Operation Instructions...............................................................................................................85
6.3.1. Power-on Initial Interface................................................................................................................................................................... 85
6.3.2. Main Menu Interface............................................................................................................................................................................. 86
Chapter 7: System Operation and Maintenance...........................................................................................................................89
7.1. Electrical Inspection ..............................................................................................................................................................................................89
7.2. Indoor Unit Maintenance................................................................................................................................................................................ 90
7.2.1. Filter ........................................................................................................................................................................................................................90
7.2.2. Fan........................................................................................................................................................................................................................... 93
7.2.3. Drain Pipe......................................................................................................................................................................................................... 93
7.2.4. Electrical Heater........................................................................................................................................................................................ 93
7.2.5. Infrared Humidifier...................................................................................................................................................................................94
7.2.6. Power SPD (Optional).......................................................................................................................................................................... 95
7.2.7. Thermal Expansion Valve (TXV).................................................................................................................................................97
7.2.8. High-Pressure Switch and Low-Pressure Switch.......................................................................................................97
7.2.9. Compressor.....................................................................................................................................................................................................97
7.3. Outdoor Unit Maintenance............................................................................................................................................................................99
7.3.1. Refrigeration System..............................................................................................................................................................................99
7.3.2. Air-Cooled Condenser.........................................................................................................................................................................99
7.4. Monthly Routine Maintenance................................................................................................................................................................100
7.5. Routine Maintenance and Inspection (Semi-annually) ................................................................................................... 101

Vertiv™ | Liebert® DM | User Manual v
Table of Contents
Chapter 8: Troubleshooting................................................................................................................................................................................102
Appendix I: Circuit Diagram of Indoor Unit...............................................................................................109
Appendix II: Circuit Diagram of Outdoor Unit..........................................................................................115
Appendix III: Menu Structure of Controller...............................................................................................116
Appendix IV: Parameter Setting Tables.....................................................................................................117
Appendix V: Routine Maintenance Inspection Items
(Monthly) .............................................................................................................................................................120
Appendix VI: Routine Maintenance Inspection Items
(Semi-annually)..................................................................................................................................................121
Appendix VII: Table Names and Content of Harmful
Substances in Products ..................................................................................................................................122

Vertiv™ | Liebert® DM | User Manual 1
Overview
Chapter 1: Overview
This chapter introduces the model description, product introduction, basic parameters, main components, optional
components, and ambient requirements of Vertiv™ Liebert® DM air conditioner (hereafter Liebert® DM).
1.1. Product Introduction
The Liebert DM AC is a small precise environment control system, specially designed for cooling the electrical equipment
room/ small IT room. It is applicable to environment control in equipment room, computer room and similar eco-system.
Featuring high reliability, it can maintain a favorable environment for precision equipment such as sensitive equipments,
industrial processing equipments, communication equipments, and computers.
The Liebert DM AC has a micro-processing controller that can automatically switch over to the required function (cooling
or heating, dehumidifying or humidifying), based on the advance programmed algorithm, setpoints and room ambient
conditions. The cooling kit is provided as standard that can precisely control the ambient temperature. An electrical heater
and the humidifier are provided as options to precisely control the ambient humidity. If the AC unit is only available for
cooling, the optional components are not needed. Each Liebert DM unit consists of an indoor unit and the outdoor unit,
these units must be installed on the seperate floors or rooms.
1.1.1. Indoor unit
Liebert DM series air conditioner with 07 kW/12 kW/17 kW/22 kW/27 kW cooling capacity used in 400 V (±10%) three-phase
power supply distribution.
DME07 Upflow Model DME12 Upflow Model DME17 Upflow Model
Figure 1-1 Liebert DM Indoor Unit (07 kW, 12 kW, and 17 kW)

Vertiv™ | Liebert® DM | User Manual 2
Overview
DME22/27 Upflow Model DME22/27 Downflow Model
Figure 1-2 Liebert®DM Indoor Unit (22 kW and 27 kW)
1.1.2. Outdoor unit
The outdoor unit is an air-cooled type.
DMC07WA1 DMC12WA1 DMC17WA1
Figure 1-3 Liebert®DM Outdoor Unit (07 kW, 12 kW and 17 kW)

Vertiv™ | Liebert® DM | User Manual 3
Overview
DMC22/27MA1
Figure 1-4 Liebert®DM Outdoor Unit (22 kW and 27 kW)
A water-cooled condenser option is available on request, contact Vertiv representative for more details.

Vertiv™ | Liebert® DM | User Manual 4
Overview
1.2. Model Description
The Liebert® DM air conditioner series is fully-defined by eleven digits, as represented in Table 1-1.
Table 1-1 Liebert DM Model Nomenclature
1 2 3 4 5 6 7 8 9 10 11
D M E 0 7 M C S U A 1
Digit 1,2 Product Model
DM DataMate
Digit 3 Unit
E Indoor Unit
C Outdoor Unit
Digit 4,5 Cooling Capacity kW
0-9 Nominal Cooling Capacity - kW
Digit 6 Power Supply
M 400 V, 3 Ph, 50 Hz
W 230 V, 1 Ph, 50 Hz
Digit 7 Cooling System
C Cooling Only
0 Cooling and Heating
H Cooling and Heating and Humidifying
Digit 8 Fan
S Forward Centrifugal Fan AC Type
0 Backward Centrifugal Fan AC Type
1 EC Fan
Digit 9 Air Discharge
U Upflow
F Downflow
Digit 10 Client Code
A For Asia Pacific Customer
Digit 11 Version
1-9 Design Version
The standard components are represented in ‘Bold Italic’ font in Table 1-1.
• The specification options represented in nomenclature such as Cooling system, Fan and Air discharge are
only applicable to the Indoor unit.
• Power supply of 400 V, 3 Ph, 60 Hz is available on request, contact vertiv representative for details.
• There is no Cooling Only option for 07 kW and 12 kW models.

Vertiv™ | Liebert® DM | User Manual 5
Overview
1.3. Basic Performance Parameters
The basic performance parameters of the Liebert® DM air conditioner are shown in Table 1-2.
Table 1-2 Basic Performance Parameters
Model Nominal Cooling
Capacity (kW)
Power
(kW)
Heating Power[1]
(kW)
Humidification
Capacity[2] (kg/h)
DME07M**UA1 (upflow) 7.5 2.5 3.0 1.5
DME12M**UA1 (upflow) 12.5 4.3 3.0 1.5
DME17M*0UA1 (upflow) 17.0 5.7 5.5 3.0
DME22M*0UA1 (upflow) 22.0 7.0 6.0 3.0
DME22M*0FA1 (downflow) 22.0 7.4 6.0 3.0
DME27M*1UA1 (upflow) 28.1 8.9 6.0 3.0
DME27M*1FA1 (downflow) 28.1 9.3 6.0 3.0
1. The heating power values are only applicable for models with the electrical heating option.
2. The humidification capacity values are only applicable for models with humidification option.
Due to the continuous upgrade of the unit, the technical parameters are subject to change without prior
notice, therefore for the details of performance parameters refer to respective nameplate of the unit.
1.4. Main Components
1.4.1. Indoor Unit
The indoor unit consists of evaporator, compressor, fan, micro-processing controller, thermal expansion valve, filter dryer,
sight glass, strainer, electrical heater (optional), humidifier (optional), and surge protective devices (SPD optional).
For optional component details, refer to Section 1.5.
• Evaporator
The unit is equipped with with a high-eiciency finned-tube heat exchanger along with a distributor, which is designed
and verified according to the individual model to ensure that the refrigerant is distributed evenly in each circuit, thereby
improving the eectiveness of the evaporator.
• Compressor
The Liebert DM unit consists of a compressor with high eiciency ratio. It has features such as low vibration, low noise and
high reliability, refer Figure 1-5 for better understanding.

Vertiv™ | Liebert® DM | User Manual 6
Overview
Figure 1-5 Scroll Compressor
• Centrifugal Fan
A highly eicient and reliable centrifugal fan is provided in Vertiv™ Liebert® DM unit, that can handle large airflow. It also has
features such as long throw, direct driven, and easily maintainable.
Figure 1-6 Centrifugal Fan

Vertiv™ | Liebert® DM | User Manual 7
Overview
• Microprocessor
Figure 1-7 Microprocessor Controller Screen
Vertiv™ Liebert® DM air conditioning unit is configured with 7-inch HMI color screen. The user-friendly interface operation
is simple. The multi-level password protection feature can eectively prevent unauthorized operation. It also provides self
recovery on power failure; high & low voltage protection functions and phase loss protection. The operation status of the
components are available on the respective menus. The expert-level fault diagnosis system can automatically display the
current fault information, facilitating easy maintenance.
• Thermal Expansion Valve (TXV)
The Liebert® DM unit has an external equalizer type mechanical Thermal Expansion Valve (TXV) which accurately regulates
the refrigerant flow into the evaporator.
Figure 1-8 Thermal Expansion Valve (TXV)

Vertiv™ | Liebert® DM | User Manual 8
Overview
• Filter Dryer
Moisture can adversely aect the operations and service life of a system in the refrigeration life-cycle. In order to rectify this
condition, the unit is equipped with a filter dryer that can filter out, hold, and prevent the moisture particles from circulating
through the system.
Figure 1-9 Filter Dryer
• Sight Glass (Only for 22 kW and 27 kW)
The sight glass is an utility used for observing the refrigerant state; specifically, the moisture content of the system. If the
moisture content exceeds the levels of defined standards, then there is a color change in sight glass, indicating the presence
of moisture content in the refrigerant.
Figure 1-10 Sight Glass
• Air Filter
The Liebert® DM unit is equipped with a nylon air filter rated for 90% filtration eiciency at 10-micron particle size. The air
filter has features such as compact structure, reusable, and easy maintenance.
A standard G4 filter option is available on request, contact Vertiv representative for more details.

Vertiv™ | Liebert® DM | User Manual 9
Overview
1.4.2. Outdoor Unit
Vertiv™ Liebert® DM outdoor unit consists of condenser coil, fan, and fan speed controller.
• Condenser Coil
The unit is equipped with an uniquely designed finned-tube heat exchanger (condenser) with wavy fin on the surface, which
facilitate high heat transfer rate. The condenser also has anti-dust feature over its surface thereby enables easy cleaning
and maintenance of the outdoor unit.
• Fan
The fan has axial flow blades with low noise and a high performance 3 Ph induction motor which can be customized to
operate on a wide voltage range with high reliability.
Figure 1-11 Axial Flow Blade
• Fan Speed Controller (Only for 22 kW and 27 kW)
The Liebert DM unit is equipped with a fan speed controller that is used to control the fan speed according to the
requirements of the air conditioner condenser based on the condenser pressure and input conditions. The fan speed
controller is installed in the outdoor unit, and used to control the speed of the outdoor unit fan.

Vertiv™ | Liebert® DM | User Manual 10
Overview
1.5. Optional Components
1.5.1. Infrared Humidifier
The humidifier can add pure water vapor (up to 3 kg/hour) into the room to control the humidity within levels required by
equipment or computer room. The humidifier consists of an infrared lamp, a water injection valve, a humidifying water pan, a
temperature protection device, and a water level alarm device.
No. Description No. Description
1 Inlet pipe 2 Outlet joint
Figure 1-12 Infrared Humidifier
• The humidifier is installed and tested in the factory.
• The Liebert®DM can control the ambient humidity only if a humidifier is installed.