Vertiv Liebert PEX3 DX Series User manual

Liebert® PEX3TM DX Series
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 specied 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 Pacic
Homepage: www.vertiv.com.
E-mail: [e-mail]
Australia
Customer service hotline: [phone]
New-Zealand
Customer service hotline: [phone]
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 specications, installation, commissioning, and maintenance procedures with troubleshooting
from the user perspective. The gures used in this document are for reference only.
Please read this manual carefully before installing, maintaining, and troubleshooting.
Liebert PEX3 DX series 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 dened 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 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.
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 denitions, concepts, and
terminologies used in the manual.
Version History
Version Revision Date Issue Changes
1.0 25.08.2019 ---

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 qualied 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 modication 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 airow 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 uids 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 humidiers are extremely hot during
the unit operation. Therefore, allow suicient 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 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® PEX3™ Series Precision Air Conditioner | User Manual i
Table of Contents
Table of Contents
Chapter 1: Product Overview................................................................................................................................................................................1
1.1. Product Introduction................................................................................................................................................................................................1
1.2. Model Description....................................................................................................................................................................................................2
1.3. Model Nomenclature..............................................................................................................................................................................................3
1.4. Components of PEX3 Model..........................................................................................................................................................................4
1.4.1. Indoor Unit Parts........................................................................................................................................................................................... 5
1.4.2. 9-Inch Color Display..................................................................................................................................................................................7
1.4.3. Condenser..........................................................................................................................................................................................................8
1.4.4. Remote Monitoring Software..........................................................................................................................................................8
1.5. Optional Components...........................................................................................................................................................................................8
1.5.1. Electrode Humidier .................................................................................................................................................................................8
1.5.2. 2-stage Electrical Heating..................................................................................................................................................................8
1.5.3. Dual Power Supply- ATS...................................................................................................................................................................... 8
1.5.4. Dual Power Supply- Parallel..............................................................................................................................................................8
1.5.5. Plenum Conguration.............................................................................................................................................................................9
1.5.6. Dual Power (Interlocked Contactors)......................................................................................................................................9
1.5.7. Large & Small Display..............................................................................................................................................................................9
1.5.8. IS-UNITY-DP Card Assembly..........................................................................................................................................................9
1.5.9. Smoke Detectors.......................................................................................................................................................................................10
1.5.10. Fire Detectors.............................................................................................................................................................................................10
1.5.11. Supply Air Pressure Sensor............................................................................................................................................................10
1.5.12. Supply Air Temperature Sensor ...............................................................................................................................................10
1.6. Refrigerant Requirement.................................................................................................................................................................................10
1.6.1. Charging Refrigerant................................................................................................................................................................................11
1.7. Storage & Operating Environment Requirements...................................................................................................................12

Vertiv | Liebert® PEX3™ Series Precision Air Conditioner | User Manual ii
Table of Contents
Chapter 2: Installation................................................................................................................................................................................................13
2.1. Pre-installation ...........................................................................................................................................................................................................13
2.1.1. Transportation & Movement............................................................................................................................................................13
2.1.2. Unpacking ........................................................................................................................................................................................................14
2.1.3. Inspection..........................................................................................................................................................................................................16
2.2. Installation Preparation (Site Preparation)...................................................................................................................................16
2.2.1. Equipment Room Requirements................................................................................................................................................16
2.2.2. Installation Space Requirements.............................................................................................................................................. 17
2.2.3. Maintenance Space Requirement ...........................................................................................................................................18
2.2.4. Installation Tools......................................................................................................................................................................................20
2.2.5. System Arrangement during Installation..........................................................................................................................21
2.2.6. System Installation Mode................................................................................................................................................................24
2.3. Mechanical Installation ....................................................................................................................................................................................27
2.3.1. Indoor Unit Size and Weight (Product Dimension)................................................................................................. 27
2.3.2. Plenum Dimensions (for Upow Unit)................................................................................................................................29
2.3.3. Dimension and Weight of Condenser..................................................................................................................................29
2.3.4. Base Plate Cut-out Position and Dimension ................................................................................................................29
2.3.5. Position and Dimension of Air Outlet on Top Cover.............................................................................................35
2.3.6. Indoor Installation ...................................................................................................................................................................................36
2.3.7. Installing Floor Stand............................................................................................................................................................................38
2.3.8. Installation of Indoor Unit................................................................................................................................................................38
2.3.9. Pipe Installation Unit (Air-cooled Units)...........................................................................................................................39
2.3.10. Infrared Humidication Inlet Pipe Connection........................................................................................................40
2.3.11. Connection of Copper Pipe (Discharge and Liquid pipe) between
Indoor and Outdoor Unit .................................................................................................................................................................41
2.3.12. Height Dierence Requirements and Equivalent Length Calculation..............................................43
2.3.13. Pipe Installation Unit (Water-cooled unit)....................................................................................................................44

Vertiv | Liebert® PEX3™ Series Precision Air Conditioner | User Manual iii
Table of Contents
2.3.14. Connection between Water inlet and Outlet Pipe of Cooling Water..................................................44
2.3.15. Lowering the Fan...................................................................................................................................................................................46
2.3.16. Removing Transportation Fixing Plate of the Compressor..........................................................................49
2.3.17. Removing of Fasteners of Infrared Humidier..........................................................................................................49
2.3.18. Removing Pipe Fasteners.............................................................................................................................................................50
2.3.19. Installation Inspection.......................................................................................................................................................................50
2.4. Electrical Installation...........................................................................................................................................................................................51
2.4.1. Installation Precautions.......................................................................................................................................................................51
2.4.2. Wiring of Indoor Unit............................................................................................................................................................................51
2.4.3. Connecting Control Cables...........................................................................................................................................................55
2.4.4. Connecting Water-Under-Floor Sensor............................................................................................................................56
2.4.5. Remote Shutdown Control Line Connection...............................................................................................................56
2.4.6. Customized Alarm Terminal.........................................................................................................................................................56
2.4.7. External General Alarm......................................................................................................................................................................56
2.4.8. Condenser Wiring................................................................................................................................................................................... 57
2.4.9. Check the Installation.........................................................................................................................................................................58
Chapter 3: Touchscreen Operation...........................................................................................................................................................59
3.1. Touchscreen Display and User Interface....................................................................................................................................... 59
3.2. Touchscreen Status Dial ................................................................................................................................................................................ 61
3.2.1. Dial Background-Color Status Indication..........................................................................................................................61
3.3. Control Header........................................................................................................................................................................................................ 63
3.3.1. Powering-On iCOM and Logging-in/ Unlocking Controls................................................................................63
3.3.2. Powering-on the Thermal Management Unit .............................................................................................................63
3.3.3. Powering-O the Thermal Management Unit.............................................................................................................65
3.3.4. Logging Out..................................................................................................................................................................................................65
3.3.5. Setting the Date and Time.............................................................................................................................................................66

Vertiv | Liebert® PEX3™ Series Precision Air Conditioner | User Manual iv
Table of Contents
3.3.6. Searching.........................................................................................................................................................................................................66
3.3.7. Using Context-Sensitive Help .....................................................................................................................................................67
3.3.8. About iCOM Version.............................................................................................................................................................................67
3.3.9. Accessing the User and Service Functions...................................................................................................................67
3.3.10. User Menu....................................................................................................................................................................................................67
3.3.11. Service Menu..............................................................................................................................................................................................68
3.3.12. Advanced Menu......................................................................................................................................................................................69
3.4. User Operation........................................................................................................................................................................................................ 70
3.4.1. Editing Humidity Setpoints ............................................................................................................................................................70
3.4.2. Editing Temperature Setpoints.................................................................................................................................................70
3.4.3. Viewing Unit Alarms..............................................................................................................................................................................71
3.4.4. Silencing an Audible Alarm............................................................................................................................................................ 71
3.4.5. Acknowledging Alarms.......................................................................................................................................................................71
3.4.6. Viewing the Event Log....................................................................................................................................................................... 72
3.4.7. Viewing Sensor Data ............................................................................................................................................................................ 73
3.4.8. Managing Run Hours for a Component............................................................................................................................ 73
3.4.9. Setting Run Hours to Zero............................................................................................................................................................. 73
3.4.10. Viewing Teamwork, Stand-by, Cascade and Operating Status...............................................................74
Chapter 4: iCOM Controller Operation.................................................................................................................................................75
4.1. LCD Screen...................................................................................................................................................................................................................75
4.2. Button and Indicator Panel..........................................................................................................................................................................75
4.3. Structure Chart of Control Menu...........................................................................................................................................................77
4.4. Start-Up Interface.................................................................................................................................................................................................78
4.5. Main Interface...........................................................................................................................................................................................................78
4.6. User Menus.................................................................................................................................................................................................................79
4.7. Password.......................................................................................................................................................................................................................80

Vertiv | Liebert® PEX3™ Series Precision Air Conditioner | User Manual v
Table of Contents
4.8. Setpoints.......................................................................................................................................................................................................................80
4.9. Event Log...................................................................................................................................................................................................................... 81
4.10. Graphics....................................................................................................................................................................................................................... 81
4.11. Set Alarms...................................................................................................................................................................................................................82
4.12. Display Setup ......................................................................................................................................................................................................... 83
4.13. Total Run Hrs .........................................................................................................................................................................................................84
4.14. Sleep Mode .............................................................................................................................................................................................................. 86
4.15. Service Info...............................................................................................................................................................................................................86
4.16. Active Alarms......................................................................................................................................................................................................... 86
Chapter 5: Application of INTELLI SLOT ...........................................................................................................................................87
5.1. Introduction of Host Communication Card...................................................................................................................................87
5.2. Commissioning Host Communication Component............................................................................................................ 88
5.2.1. Assigning the Card’s IP Address ...............................................................................................................................................88
5.2.2. Connect an Ethernet Cable ..........................................................................................................................................................89
5.2.3. Connect a RS-485 Serial Cable................................................................................................................................................ 90
Chapter 6: System Operation and Maintenance........................................................................................................................91
6.1. Routine Maintenance Inspection Items (Monthly)................................................................................................................ 91
6.2. Routine Maintenance Inspection Items (Semi-Annual)................................................................................................. 92
6.3. Self-Diagnostic System .................................................................................................................................................................................. 93
6.4. Check the Electrical Connections and Maintenance ....................................................................................................... 93
6.5. Appearance Inspection and Maintenance of Controller Components............................................................94
6.6. Air-Cooled Condenser Maintenance Guide ............................................................................................................................... 95
6.7. Water-Cooled Condenser Maintenance Guide........................................................................................................................ 95
6.8. Filter Maintenance Guide.............................................................................................................................................................................96
6.9. Infrared Humidier Maintenance Guide..........................................................................................................................................97