Vertiv Liebert DM Series User manual

Liebert DM Series
Precision Air Conditioner
User Manual

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 effort 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
Website: www.vertivco.com.
E-mail: [e-mail].
Customer service hotline: [phone]
•Asia Pacific
Homepage: www.vertivco.com.
E-mail: [e-mail]
For Technical Support, users may contact the nearest Vertiv Co. local sales office or service
center.
Vertiv | Liebert DM Series Precision Air Conditioner | User Manual

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.
This document explains the product description, installation measures, operational workflow,
maintenance, and detailed aspects from the user perspective. The figures used in this document
are for reference only.
Please read this manual carefully before installing, maintaining, and troubleshooting, especially
the warning information in the manual
Styling used in this Guide
The styles used in the manual will be defined as mentioned in the following table:
Situation
Description
Warning/Danger/Caution
The Warning/Danger/Caution note
indicates a hazardous or potentially
harmful situation that can result in death
or injury. It also indicates instructions that
need to be adhered to, failing which may
result in danger and safety issues thereby
having an adverse effect on the reliability
of the device and security. Even for
practices not related to physical injury, the
content under the Warning heading is
used for precautions which need to be
taken which, otherwise, could result in
equipment damage, performance
degradation, or interruption in service.
Note
The Note section indicates additional and
useful information including tips and
tweaks. 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
mainstream stuff also comes under the
Note heading helping the users get to
grips with the definitions, concepts, and
terminologies used in the manual.
Vertiv | Liebert DM Series Precision Air Conditioner | User Manual

Version History
Issue
Revision
Changes
1
1.0
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Safety Precautions and Measures
The important safety precautions and measures that should be followed during the installation and
maintenance of the Liebert DM models 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.
The user reads and takes into account all the precautions, compliance, and safety measures before
working on the equipment. 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 machine. The user must read all the
precautions, danger, warnings, and cautionary measures mentioned in the manual prior to
carrying out any operations on the machine. Each machine 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; Open the right door to access it. Before any maintenance operation,
switch off the machine with this electronic insulation device in order 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 off by opening
the main switch.
In the following section, take a look at 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 that the voltage matches the utility power that is available for that unit.
Vertiv | Liebert DM Series Precision Air Conditioner | User Manual

The controller doesn’t isolate power from the unit even in the Off mode. Moreover, some internal
components require and receive power even during the Off 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 which may result in object
ejection during the fan start-up and there is a probable risk of being hit by these objects leading to grievous
injury as well as causing equipment damage.
The unit contains fluids and gasses 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 sufficient time for the unit to cool down before working with the
unit cabinet. Handle the unit with extreme caution and wear safety equipment such as protective gloves,
safety shoes, and arm protection while working with the hot compressors, discharge lines, and reheats.
There is a risk of leaking water that can cause damage to the equipment as well as the building. There
should be an effective water drain connection and facilities. Installation should be precise. Implementation
of the application and service practices should be suitable and fault-free. Not complying with these norms
will result in water leakage from the unit. Water leakage can result in massive damage and loss of critical
equipment in the hosting ecosystem. Therefore, care should be taken to ensure that the unit must not be
located directly above any equipment that could sustain damage due to water and excessive moisture.
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

TABLE OF CONTENTS
PART I - GENERAL INFORMATION
1 Introduction ......................................................................................................................................................................................... 2
1.1 Model Nomenclature....................................................................................................................................................... 3
1.2 Basic Performance Parameters .............................................................................................................................. 3
1.3 Product Description ........................................................................................................................................................ 4
1.3.1 Compressor ......................................................................................................................................................... 5
1.3.2 Evaporator ........................................................................................................................................................... 6
1.3.3 Thermal expansion valve (TXV) ......................................................................................................... 6
1.3.4 Micro-processing Controller.................................................................................................................. 7
1.3.5 Strainer .................................................................................................................................................................. 7
1.3.6 Filter ......................................................................................................................................................................... 8
1.3.7 Centrifugal Fan................................................................................................................................................. 8
1.3.8 Condenser ........................................................................................................................................................... 8
1.3.9 Sight Glass .......................................................................................................................................................... 9
1.3.10 Infrared Humidifier ..................................................................................................................................... 9
1.4 Optional Components ................................................................................................................................................ 10
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

1.5.3 Refrigerant Charging Requirement ................................................................................................ 13
PART II - INSTALLATION
2 Installation .......................................................................................................................................................................................... 15
2.1 Pre-Installation ................................................................................................................................................................. 15
2.1.1 Transportation and Movement ........................................................................................................... 15
2.1.2 Unpacking..........................................................................................................................................................16
2.1.3 Inspection .......................................................................................................................................................... 17
2.2 Installation Preparation (Site Preparation) ................................................................................................. 17
2.2.1 Equipment Room Requirement.......................................................................................................... 17
2.2.2 Installation Space requirements .......................................................................................................18
2.2.3 Installation Tools.........................................................................................................................................20
2.3 Mechanical Installation .............................................................................................................................................. 21
2.3.1 System arrangement during installation..................................................................................... 21
2.3.2 System Installation Mode ..................................................................................................................... 23
2.3.3 Product Dimensions ................................................................................................................................. 24
2.3.4 Outdoor unit ................................................................................................................................................... 25
2.3.5 Indoor Unit Installation ........................................................................................................................... 26
2.3.6 Outdoor Unit Installation ...................................................................................................................... 27
2.3.7 Procedure ......................................................................................................................................................... 27
2.3.8 Piping for AC Unit ...................................................................................................................................... 29
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

2.3.14 Connecting liquid pipe ......................................................................................................................... 34
2.3.15 Connecting Drain Pipe Of Indoor Unit ...................................................................................... 35
2.3.16 Connecting Humidifier Water Supply Pipe (If Applicable) ........................................ 35
2.3.17 Removing Transportation Fastener And Vibration Absorber ................................. 35
2.3.18 Adding Refrigerant For Long Pipe System ........................................................................... 36
2.3.19 Check List ...................................................................................................................................................... 37
2.4 Electrical Installation .................................................................................................................................................. 38
2.4.1 On-site Wire connections ..................................................................................................................... 38
2.4.2 Installation Notes ....................................................................................................................................... 38
2.4.3 Connecting Power Cable Of Indoor Unit ................................................................................... 39
2.4.4 Connecting Power Cable Of Outdoor Unit ............................................................................. 40
2.4.5 Connecting Control Terminals ......................................................................................................... 41
2.4.6 Connecting Monitoring Port Cable ............................................................................................... 45
2.4.7 Connecting Energy-Saving Card .................................................................................................... 45
2.4.8 Checklist ........................................................................................................................................................... 47
PART III - SYSTEM OPERATION & GENERAL MAINTENANCE
3 System Operation ......................................................................................................................................................................... 51
3.1 Start-Up Inspection ....................................................................................................................................................... 51
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

3.2.6 ON Screen ........................................................................................................................................................ 55
3.2.7 Language Screen ........................................................................................................................................ 55
3.2.8 Normal Screen .............................................................................................................................................. 56
3.2.9 Password Screen ........................................................................................................................................ 56
3.3 Function Testing ........................................................................................................................................................... 57
3.3.1 Cooling ................................................................................................................................................................ 57
3.3.2 Heating............................................................................................................................................................... 58
3.3.3 Humidifying .................................................................................................................................................... 58
3.3.4 Dehumidifying .............................................................................................................................................. 58
3.3.5 Checking Refrigerant Charge Capacity of Low-Temp Outdoor .............................. 58
3.4 Micro-Processing Controller Menu Options ............................................................................................. 59
3.4.1 Main Menu........................................................................................................................................................ 59
3.4.2 Alarm Menu ................................................................................................................................................... 60
3.4.3 Set Points ......................................................................................................................................................... 63
3.4.4 System Status............................................................................................................................................... 63
3.4.5 System Menu .................................................................................................................................................66
3.4.6 Help Menu ....................................................................................................................................................... 67
3.4.7 Display Set .......................................................................................................................................................68
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