Liebert® CRV4 Series
Precision Air Conditioning
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
Homepage: www.vertiv.com
E-mail: support@Vertiv.com
Customer service hotline: 4008876510
Asia Pacific
Homepage: www.vertiv.com.
E-mail: overseas.support@Vertiv.com
Australia
Customer service hotline: 1300367686
New-Zealand
Customer service hotline: 0800100877
For Technical Support, users may contact the nearest Vertiv Co. local sales office 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® CRV4 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 defined as mentioned in the following table:
Situation
Description
Warning/Danger/Caution
Note
•
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, to avoid equipment damage, performance degradation,
or interruption in service, follow the warning instruction.
•
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
Version
V1.4
Revision Date
Issue
08.05.2020
31013900
Changes
---
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 off 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 off 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 Off mode, and some internal components still
require and receive power 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 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 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 water leaking that can damage both the equipment and the building. Effective 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.
Table of Contents
Table of Contents
Chapter 1: Introduction...................................................................................................................................................................................................1
1.1. Product Introduction.................................................................................................................................................................................................1
1.2. Model Nomenclature...............................................................................................................................................................................................1
1.3. Product Appearance...............................................................................................................................................................................................3
1.4. Main Components.....................................................................................................................................................................................................3
1.4.1. EC Compressor .............................................................................................................................................................................................. 3
1.4.2. Evaporator ......................................................................................................................................................................................................... 3
1.4.3. Electronic Expansion Valve (EEV)..............................................................................................................................................4
1.4.4. Electrode Humidifier.................................................................................................................................................................................4
1.4.5. EC Fan.....................................................................................................................................................................................................................4
1.4.6. Electrical Heater...........................................................................................................................................................................................4
1.4.7. Sight Glass...........................................................................................................................................................................................................4
1.4.8. Filter Dryer..........................................................................................................................................................................................................4
1.4.9. Display Screen................................................................................................................................................................................................4
1.4.10. Remote Monitoring Software.........................................................................................................................................................4
1.5. Options.................................................................................................................................................................................................................................5
1.5.1. Air Pressure Difference Switch......................................................................................................................................................... 5
1.5.2. Water Leakage Detection Kit........................................................................................................................................................... 5
1.5.3. Remote Temperature Sensor Kit.................................................................................................................................................. 5
1.5.4. Monitoring Card............................................................................................................................................................................................. 5
1.5.5. Dual Power Module.................................................................................................................................................................................... 5
Chapter 2: Installation.....................................................................................................................................................................................................6
2.1. Equipment Room Consideration..................................................................................................................................................................6
2.2. Installation Space Requirements...............................................................................................................................................................7
2.2.1. Maintenance Space Requirements for Liebert CRV4...............................................................................................7
2.3. Environmental Requirements........................................................................................................................................................................8
Vertiv | Liebert® CRV4 | User Manual
i
Table of Contents
2.3.1. Operating Environment.......................................................................................................................................................................... 8
2.3.2. Storage Environment ............................................................................................................................................................................. 8
2.4. Refrigerant Charging Requirement.........................................................................................................................................................9
2.5. Transportation, Unpacking and Inspection......................................................................................................................................9
2.5.1. Transportation and Movement.......................................................................................................................................................9
2.5.2. Unpacking .......................................................................................................................................................................................................10
2.5.3. Inspection .........................................................................................................................................................................................................11
Chapter 3: Mechanical Installation....................................................................................................................................................................12
3.1. System Arrangement during Installation...........................................................................................................................................12
3.1.1. General Arrangement..............................................................................................................................................................................12
3.1.2. System Installation Mode ..................................................................................................................................................................14
3.1.3. Mechanical Parameters ......................................................................................................................................................................16
3.1.4. Base Plate Piping Location and Dimensions ................................................................................................................. 17
3.1.5. Top Plate Piping Locations & Dimensions .......................................................................................................................18
3.1.6. Location of Front Air Outlets...........................................................................................................................................................19
3.2. Installation of the Indoor Unit.................................................................................................................................................................... 20
3.2.1. Leveling the Cabinet..............................................................................................................................................................................20
3.2.2. Removing the Leveling Feet and Fastening...................................................................................................................21
3.2.3. Assembly of the Cabinet Parts................................................................................................................................................... 22
3.3. Unit Piping Installation......................................................................................................................................................................................23
3.3.1. Removing Filter Net.................................................................................................................................................................................24
3.3.2. Connecting the Condensate Water Drainage Piping of the Indoor Unit...........................................24
3.3.3. Electrode Humidifier Water Inlet Piping Connection............................................................................................26
3.3.4. Connection of the Copper Piping between the Indoor and Outdoor Units.................................... 27
3.3.5. Installing Long Piping Kit (for site installation) .........................................................................................................30
3.3.6. Check Valve Installation......................................................................................................................................................................31
3.3.7. Installing the Solenoid Valve...........................................................................................................................................................31
3.4. Charging Refrigerant and Adding Lubricant Oil......................................................................................................................33
Vertiv | Liebert® CRV4 | User Manual
ii
Table of Contents
3.4.1. Charging Refrigerant..............................................................................................................................................................................33
3.4.2. Adding Lubricant Oil.............................................................................................................................................................................34
3.5. Removing Transportation Fastener and Vibration Absorber......................................................................................35
3.5.1. Sealing the Holes of the Top Plate of the Cabinet................................................................................................... 37
3.6. Checklist for Completed Mechanical Installation.................................................................................................................. 38
Chapter 4: Electrical Installation.......................................................................................................................................................................39
4.1. Task Introduction and Notes....................................................................................................................................................................... 39
4.1.1. Cables to Connect On-site................................................................................................................................................................39
4.1.2. Installation Notes......................................................................................................................................................................................39
4.2. Liebert CRV4 Cable Connection of Indoor Unit.....................................................................................................................40
4.2.1. Electrical Port Location of the Indoor Unit..................................................................................................................... 40
4.2.2. Connecting the Power Cable of the Indoor unit........................................................................................................41
4.2.3. Connecting the Control Cables.................................................................................................................................................42
4.2.4. Water-under-floor Sensor ..............................................................................................................................................................43
4.2.5. SIC Card ...........................................................................................................................................................................................................43
4.2.6. Rack Temperature Sensor..............................................................................................................................................................43
4.2.7. Remote Shutdown...................................................................................................................................................................................45
4.2.8. Control Signals of the Outdoor Unit ....................................................................................................................................45
4.2.9. External General Alarm .....................................................................................................................................................................45
4.2.10. Connecting the Solenoid Valve of the
Long Piping Kit- (Optional for site installation) ....................................................................................................45
4.2.11. Teamwork Control..................................................................................................................................................................................45
4.3. Electrical Installation Checklist................................................................................................................................................................46
Chapter 5: Start-up Commissioning..............................................................................................................................................................47
5.1. Location Of MCBs...................................................................................................................................................................................................47
5.2. Power-On Commissioning............................................................................................................................................................................48
5.2.1. Preparation Before Commissioning.......................................................................................................................................48
5.2.2. Commissioning Procedures...........................................................................................................................................................48
Vertiv | Liebert® CRV4 | User Manual
iii
Table of Contents
5.3. Inspection After Commissioning............................................................................................................................................................50
Chapter 6: Micro-Controller (Color Screen)..........................................................................................................................................51
6.1. Features.............................................................................................................................................................................................................................51
6.2. Appearance...................................................................................................................................................................................................................51
6.3. Control Screen..........................................................................................................................................................................................................52
6.3.1. Main Screen.................................................................................................................................................................................................... 52
6.3.2. Main Interface Control Mode........................................................................................................................................................55
6.3.3. Password Interface.................................................................................................................................................................................56
6.4. Menu Structure........................................................................................................................................................................................................57
6.4.1. Main Menu....................................................................................................................................................................................................... 57
6.4.2. Run Information.........................................................................................................................................................................................58
6.5. Alarm Information.................................................................................................................................................................................................. 61
6.5.1. Temperature and Humidity.............................................................................................................................................................62
6.5.2. Parameter Setting...................................................................................................................................................................................64
6.5.3. Graph....................................................................................................................................................................................................................68
6.5.4. About...................................................................................................................................................................................................................68
Chapter 7: Micro-Controller (Text-screen).............................................................................................................................................69
7.1. Features............................................................................................................................................................................................................................69
7.2. Appearance.................................................................................................................................................................................................................69
7.3. Graphic Color Screen......................................................................................................................................................................................... 70
7.4. Control Buttons ........................................................................................................................................................................................................71
7.4.1. Function Description............................................................................................................................................................................... 71
7.4.2. Operational Examples ........................................................................................................................................................................ 72
7.5. Control Screen...........................................................................................................................................................................................................73
7.5.1. Startup Screen.............................................................................................................................................................................................. 73
7.5.2. Main Screen .................................................................................................................................................................................................. 73
7.5.3. Password Interface ................................................................................................................................................................................74
Vertiv | Liebert® CRV4 | User Manual
iv
Table of Contents
7.6. Menu Structure .......................................................................................................................................................................................................75
7.6.1. Main Menu........................................................................................................................................................................................................ 75
7.6.2. Run Information..........................................................................................................................................................................................76
7.6.3. Alarm Information..................................................................................................................................................................................... 78
7.6.4. Temperature & Humidity Settings.......................................................................................................................................... 80
7.6.5. Parameter Settings................................................................................................................................................................................ 80
7.6.6. Alarm Set............................................................................................................................................................................................................81
7.6.7. Humidifier Set...............................................................................................................................................................................................82
7.6.8. Teamwork Set..............................................................................................................................................................................................82
7.6.9. ESP Set...............................................................................................................................................................................................................82
7.6.10. Display Set....................................................................................................................................................................................................83
7.6.11. Password Set................................................................................................................................................................................................83
7.6.12. Help......................................................................................................................................................................................................................84
Chapter 8: System Operation and Maintenance...............................................................................................................................85
8.1. Routine Maintenance & Inspection Items (Monthly) ......................................................................................................... 85
8.2. Routine Maintenance and Inspection (Semi-annually) .................................................................................................. 86
8.3. Self-Diagnosing Functions ...........................................................................................................................................................................87
8.4. Maintenance of Electrical Control Utilities....................................................................................................................................87
8.4.1. Maintenance of Electrical Parts ................................................................................................................................................. 87
8.4.2. Maintenance of Control System................................................................................................................................................88
8.4.3. Water-Leak-Detector...........................................................................................................................................................................88
8.5. Air Filter Maintenance......................................................................................................................................................................................90
8.6. Fan Kit Maintenance..........................................................................................................................................................................................90
8.7. General Maintenance for the Electrode Humidifier............................................................................................................. 92
8.7.1. Operating Guidelines for the Electrode Humidifier..................................................................................................92
8.7.2. Replacing Humidifier.............................................................................................................................................................................93
8.8. Electrical Heater Maintenance ............................................................................................................................................................... 95
8.9. Refrigerating System Maintenance ....................................................................................................................................................96
Vertiv | Liebert® CRV4 | User Manual
v
Table of Contents
8.9.1. Suction Pressure........................................................................................................................................................................................96
8.9.2. Discharge Pressure................................................................................................................................................................................96
8.9.3. Electronic Expansion Valve (EEV)...........................................................................................................................................96
8.9.4. Air-cooled Condenser......................................................................................................................................................................... 97
8.9.5. Compressor.................................................................................................................................................................................................... 97
8.10. Drainage System Maintenance ............................................................................................................................................................99
Chapter 9: Troubleshooting...................................................................................................................................................................................101
9.1. Troubleshooting of the Fan.........................................................................................................................................................................101
9.2. Troubleshooting of the Heating System .....................................................................................................................................102
9.3. Troubleshooting of Compressor and Cooling System....................................................................................................102
Appendix I: Circuit Diagram of Model CR025, CR035 and CR045.................................................................................105
Appendix II: Display Menu Structure of the Screens....................................................................................................................108
Appendix III: Alarm Menu Control Table...................................................................................................................................................110
Appendix IV: Routine Maintenance Inspection Items
(Monthly).................................................................................................................................................................................................................................111
Appendix V: Routine Maintenance Inspection Items
(Semi-annually).................................................................................................................................................................................................................112
Appendix VI: Table Names and Content of Harmful
Substances in Products............................................................................................................................................................................................114
Vertiv | Liebert® CRV4 | User Manual
vi
Introduction
Chapter 1: Introduction
Vertiv™ Liebert® CRV4 series air conditioner (“Liebert CRV4” for short hereafter) is an elegant row-cooling
equipment, which should not be accessible to the general public. This chapter introduces the model
description, product introduction, features, and main components of the Liebert CRV4 series of air conditioner.
1.1. Product Introduction
The Liebert CRV4 series is the next generation series of air conditioners that provide precise environmental
control. Liebert CRV4 air conditioners are products that are specifically created and designed for the small
to medium data centers, computer rooms, and similar ecosystems which require a high degree of accuracy
and precision. It addresses the needs and challenges associated with such applications and setups. It caters
to sensitive applications that need a suitable environment for optimal performance. Therefore, care should be
taken when testing these products to maintain favorable conditions for mission-critical equipment. Precision Air
Conditioning must not only keep room conditions within a specific range but also must have the capability to
react quickly to drastic changes in the heat-load and prevent wide temperature fluctuations.
The Liebert CRV4 air-cooled AC unit is packed with features such as high reliability, high sensible heat ratio,
and large airflow. The unit has an air-cooled single circuit system and configured with EC fan.
The Liebert CRV4 series air-cooled air conditioning is a stand-alone, direct expansion system with variable
capacity, available in both 300 mm (25 kW) and 600 mm (35 & 45 kW) versions, complete with roof or
wall-mounted condenser. It is ideally suited for rack-level cooling, specifically designed for high return air
temperatures. The Liebert CRV4 optimizes air distribution and maximizes efficiency, delivering both cost and
economical operation.
1.2. Model Nomenclature
The Liebert CRV4 air conditioner series is fully-defined by twenty-five digits, as represented in Table 1-1.
Vertiv | Liebert® CRV4 | User Manual
1
Introduction
Table 1-1 Liebert® CRV4 Model Nomenclature
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
C
R
0
2
5
R
A
1
N
8
S
7
1
2
E
3
0
0
0
0
C
V
0
4
0
Digit 1, 2 Product Model
Digit 15 Coil and Valves
CR
E
CRV
Standard DX Air- Cooled Coil, EEV
Digit 3, 4, 5 Cooling Capacity kW
Digit 16 Enclosure Options
025/ 035/ 045
3
Nominal Cooling Capacity- kW
Black Color Sand Grain Coating, EG7021
Digit 6 Air Discharge
Digit 17 Mains Switch High Voltage Options
R
Horizontal Airflow with Baffle
0
None
H
Horizontal Airflow without Baffle
A
Dual Power Supply Interlocking Contactor
Digit 7 System Type
Digit 18 Installation Options
A
Air-cooled
0
None, Standard Pipe, No Low Ambient Kit
P
Refrigerant Pump Cooling
H
Reheat & Humidity Lockout
L
Air-cooled, Long Pipe > 30 m
C
Low Ambient Kit
B
Low Ambient Kit+Long Pipe
Digit 8 Airflow
1
EC Plug Fan
Digit 9 Power Supply
N
380 V - 415 V/ 3 Ph/ 50 Hz+N
380 V - 415 V/ 3 Ph/ 60 Hz+N
Digit 19 Monitoring
0
RS485
Digit 10 Cooling System
S
SIC Card
8
EC Compressor, Single Circuit, R410A
Digit 20 Sensors
L
EC Compressor, Single Circuit, R410A,
Single Pump
0
None
Digit 11 Humidification
Digit 21 Packaging
0
None
P
Packaging- Standard Cardboard and
Wooden Pallet
S
Electrode Humidifier
C
Packaging- Wooden Crate
W
Wet Film Humidifier
Digit 22 Special Requirements
Digit 12 Display
A
SFA-None
Condensate Pump
S
Standard Display
V
7
Global HMI 7” Screen
Digit 23 Order Identifier
Digit 13 Re-heating
0
Bottom Piping
0
None
1
Top Piping
1
Electrical Heating Std. 1 Stage
Digit 24 Order Identifier
Digit 14 Filtration
4
CRV4
2
G4
Digit 25 Order Identifier
0
G4+Filter Clog Switch
0
Industry Code
1
Telecom Code
The standard components are represented in ‘Bold Italic’ font in Table 1-1.
Vertiv | Liebert® CRV4 | User Manual
2
Introduction
1.3. Product Appearance
Figure 1-1 shows the appearance of various models in the Liebert® CRV4 series.
CR025
Industry Code
CR035 to CR045
Industry Code
CR025
Telecom Code
CR035 to CR045
Telecom Code
Figure 1-1 Appearance of the Liebert CRV4 Air Conditioner
1.4. Main Components
The indoor unit of the Liebert CRV4 includes EC compressor, evaporator, electronic expansion valve (EEV),
humidifier, EC fan, electrical heater, sight glass, filter dryer and micro-controller.
1.4.1. EC Compressor
The Liebert CRV4 series comprises a scroll compressor which has promising features such as: low operating
noise, less vibration, and high reliability. Its compactness, smooth compression with scroll operation and high
energy efficiency ratio make it an ideal compressor for the CRV4 series; and it also has a Rotalock (screw
thread) connection mode that makes the maintenance more easier.
1.4.2. Evaporator
Liebert CRV4 series is equipped with a 7 mm copper tube finned evaporator with high heat dissipation
efficiency. This evaporator facilitated with a ‘distributor’, which is designed to ensure even distribution of
refrigerant in each loop of the evaporator. The distributor is also validated according to each specific model of
Liebert CRV4 series that improves the evaporator efficiency to a great extent.
Vertiv | Liebert® CRV4 | User Manual
3
Introduction
1.4.3. Electronic Expansion Valve (EEV)
The EEV is designed for modulating control of the refrigerant mass-flow with precision. The EEV collects
temperature and pressure signals at the same time to accurately regulate the refrigerant flow.
1.4.4. Electrode Humidifier
Electrode humidifier adopts a simple structure form with large humidifying volume and high efficiency. It
enables easy disassembly and maintenance.
1.4.5. EC Fan
The EC fan has the characteristics of high efficiency, energy saving, space saving and hot-swappable design.
1.4.6. Electrical Heater
PTC heater is used. It features fast heating speed, even heat distribution, and supports safe & reliable working.
1.4.7. Sight Glass
The sight glass is the window of the system cycle, for observing the refrigerant state, mainly the moisture
content of the system. When the moisture content exceeds the standard value, the color will be changed in the
sight glass.
1.4.8. Filter Dryer
The filter dryer eliminates the moisture effectively in the system, and also filtrates the impurities generated
during the long-term system operation so as to ensure normal system operation.
1.4.9. Display Screen
The Liebert® CRV4 air conditioning unit is configured with 7-inch HMI color screen or LCD screen. The user
interface operation is simple. The multi-level password protection feature can effectively prevent unauthorized
operation. It also provides power failure auto-restoration and high & low voltage protection functions. 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. It can store up to
1000 historical event records.
1.4.10. Remote Monitoring Software
The Liebert CRV4 air-cooled air conditioner adopts the modbus communication protocol (Modbus protocol);
through the configured RS485 port. The Liebert CRV4 air conditioner can communicate with the host
computer and receives the control instructions of the host software.
Vertiv | Liebert® CRV4 | User Manual
4
Introduction
1.5. Options
1.5.1. Air Pressure Difference Switch
The switch is used to detect if the unit filter is clogged, and send alarm signals to the control board.
1.5.2. Water Leakage Detection Kit
The kit is used to detect water-under-floor, and send alarm signals to the control board, if detects water under
floor condition.
1.5.3. Remote Temperature Sensor Kit
The sensor is used to monitor the temperature of other devices in the equipment room, and the temperature
can be used as the control temperature of the unit.
1.5.4. Monitoring Card
The RDU-SIC monitoring card is used, and it provides an RJ45 port and a USB port.
• Using the Web browser to monitor your intelligent equipment and the environment through the Web server
function provided by the SIC card.
• Using the Network Management System (NMS) to monitor customers’ intelligent equipment and the
environment through the SNMP agent function provided by the SIC card.
• Using the equipment room management software (RDU-Manager) to monitor customers’ intelligent
equipment and the environment through the TCP/IP port provided by SIC card.
• Using the centralized management software (Nform) to monitor customers’ intelligent equipment through
the Vertiv Server function provided by the SIC card.
1.5.5. Dual Power Module
Liebert® CRV4 unit is equipped with a highly efficient dual power module with minimum electrical losses. The
unit has built-in two power modules as a back up to each other to ensure seamless operation, thereby providing
reliability and stability to the system.
If the CR025 unit is equipped with top piping connection arrangement, then dual power module option is not
available in the unit; for more details contact Vertiv representative.
Vertiv | Liebert® CRV4 | User Manual
5
Installation
Chapter 2: Installation
Liebert® CRV4 air cooled AC unit is a row-cooling equipment which involves complex installation works. This
chapter details the installation preparation, including how to prepare the installation environment and space
and reserve the maintenance space, and how to unpack and inspect the unit. Please read this chapter carefully
before installation.
•
Strict adherence to the installation procedure is mandatory to ensure that the air conditioner unit is
installed properly.
2.1. Equipment Room Consideration
The requirements on the equipment room are as follows:
• Before installation, the equipment room must be prepared to ensure a smooth operating flow and to achieve
the expected results. The data center must meet the standards, to obtain proper heating and ventilation. The
design specifications for the air conditioners must be ideal and should be in-line with the energy-efficient
design standards.
• To ensure the normal operation of environment control system, the room should be moisture-proof and
Polyethylene film should be applied for the damp-proofing of the ceiling and walls. Alternatively, the same
effect similar to polyethylene can be simulated with moisture-proof paint. It is important to ensure that the
coating on the concrete wall and floor is damp-proof.
• The equipment room should be free of air leakage, reduced to a minimum because outdoor air can increase
the system load and de-stabilize the temperature gradient. It is recommended that the leakage rate of outdoor
air should be kept below 5% of the total indoor airflow.
• To avoid any outside air infiltration into the room, all the doors and windows should be properly closed.
Do not use the indoor unit for outdoor environment.
Vertiv | Liebert® CRV4 | User Manual
6
Installation
2.2. Installation Space Requirements
The Liebert® CRV4 unit is a set of full-featured air-cooled direct expansion type row-cooling unit. It is
recommended to install the unit with a row of high heat density server cabinets in an alternative manner, to form
a hot aisle and cold aisle configuration.
2.2.1. Maintenance Space Requirements for Liebert CRV4
In normal condition, a provision space of 600 mm in the front and rear sides should be reserved for maintenance
activities. Refer Figure 2-1 for better understanding and Table 2-1 describes the requirements for minimum
maintenance space as per the models
Figure 2-1 Space Clearance for Maintenance (unit: mm)
Table 2-1 Minimum Clearance Space for Maintenance
Location
CR025
CR045
CR035
mm
inch
mm
inch
mm
inch
Front
600
23.6”
600
23.6”
600
23.6”
Rear
600
23.6”
600
23.6”
600
23.6”
The space is used for regular maintenance, such as replacing filter, fan, electrode humidifier and so on. In case
of special application Contact Vertiv representative.
Vertiv | Liebert® CRV4 | User Manual
7
Installation
2.3. Environmental Requirements
2.3.1. Operating Environment
The operating environment requirements for Liebert® CRV4 are given in Table 2-2.
Table 2-2 Operating Environment Requirements
Item
Requirement
Indoor
18 °C to 40 °C, 20% to 60% RH
Outdoor
-20 °C to +45 °C, if a low temperature kit is configured, the
lowest outdoor operation temperature is -34 °C.
Ambient temperature
Protection level
(outdoor unit)
IP20
Altitude
<1000 m, Derating is required when located altitude is above 1000 m.
Operation voltage
range
380 V to 415 V±10%, 3 Ph+N ~50Hz / 60Hz
2.3.2. Storage Environment
The storage environment requirements for Liebert CRV4 are given in Table 2-3.
Table 2-3 Storage Environment Requirements
Item
Requirement
Storage
environment
Indoor, clean, no dust
Ambient
humidity
< 95% RH
Ambient
temperature
-40 °C to +70 °C
Storage time
Total transportation and storage time should not exceed six months, otherwise
the performance of the system needs to be re-calibrated.
Please contact Vertiv representative when operating in the following conditions
•
The voltage of the air conditioning unit is beyond the range of the operating voltage.
•
The altitude is higher than 1000 m.
•
If the application condition is other than Table 2-2.
Vertiv | Liebert® CRV4 | User Manual
8
Installation
2.4. Refrigerant Charging Requirement
The unit has a specifically designed air conditioning system that requires a desired per-specified quality of
refrigerant (R410A) to perform continuously at the most optimum efficiency. For the details on the quantity of
refrigerant to be charged inside the system refer Chapter 3, Section 3.4 for more detail on refrigerant charging
requirement.
•
Do not use sub-standard quality inferior refrigerant as it may cause an extensive damage to the system.
Vertiv does not undertake any responsibility for all the related consequences that result from using a low
quality inferior refrigerant.
2.5. Transportation, Unpacking and Inspection
2.5.1. Transportation and Movement
Railroad and shipping are the preferable transport options for the CRAC. If transport by rail or ship is unavailable,
transport by road is recommended. When selecting road transport, roads without too many bumps are highly
recommended.
• Liebert® CRV4 unit is heavy, it is recommended to use the mechanical equipment like electrical forklift to
move the unit.
• Move the equipment to the location near the installation site.
• If an electric forklift is used, insert the tines of the forklift below the pallet as displayed in Figure 2-2.
• Figure 2-2 shows how the forklift tines are inserted underneath the pallet and shows in the same picture the
illustration to the right that the lines should be aligned with the center of gravity to prevent the equipment
from falling over.
Figure 2-2 Moving an Equipment Using a Forklift Truck
Vertiv | Liebert® CRV4 | User Manual
9
Installation
While moving the indoor unit, keep the obliquity within the range of 75° to 105°, as shown in Figure 2-3.
Figure 2-3 Obliquity of the System
2.5.2. Unpacking
Move the unit to the location near the final installation site and unpack it. Follow the procedures below for
unpacking.
• Removal of wooden packaging
Remove the side wooden panels at first, then remove the top wooden panels; finally, remove the
wooden pallet from the base of the unit. For better understanding see Figure 2-4.
No. Description
No.
Description
1
Remove the side wooden panels
3
Unscrew the unit from the pallet
2
Remove the top wooden panels
Figure 2-4 Unpacking the Outer Package
Vertiv | Liebert® CRV4 | User Manual
10
Installation
• Removing the pallet
The unit is fixed onto the pallet with M8×20 and M8x80 screws, as shown in Figure 2-5. Use a 17 mm open-end
spanner, ratchet spanner or sleeve can be used to remove the screws.
No.
Description
No.
Description
1
Screw M8x20
2
Hexagon head bolt M8x80
Figure 2-5 Screws on the Pallet
2.5.3. Inspection
• Check that the fittings are complete and the components are intact against the packing list. Ensure that
everything is in its designated position.
• If any parts or components are missing or damaged, immediately report to the local offices of the carrier and
Vertiv representative at the earliest.
Vertiv | Liebert® CRV4 | User Manual
11
Mechanical Installation
Chapter 3: Mechanical Installation
Proper installation is important to achieve optimal performance and prolong the product life of the unit. In this
section, the mechanical installation will be discussed in detail to help the personnel handling the installation
process. Before proceeding with the mechanical installation, the following safety precautions need to be
considered.
•
Prior to installation, ensure that the installation preparations have been read and implemented as per the
requirement, (refer to Section 2.3 ‘Environmental Requirements’). Check if any modifications are made to
the piping, cabling, or ventilation facility before mounting the unit. Once the installation preparations are
taken into consideration, move on to the next step in the installation process, and eventually set up the
system.
•
Liebert® CRV4 cooling units are designed for split-floor installation. The indoor unit must be installed on
the floor of the equipment room or computer room. The outdoor unit must be installed outdoor or on the
floor of the other room as per the building architecture.
•
Follow the design drawings strictly when installing the unit. Reserve the space as per the maintenance
and serviceability instructions in the previous chapter on Installation Preparation. Refer manufacturer’s
engineering dimensions and drawings for details.
3.1. System Arrangement during Installation
3.1.1. General Arrangement
The system arrangement diagram of the refrigeration system for Liebert CRV4 air-cooled AC unit is shown in
Figure 3-1.
Vertiv | Liebert® CRV4 | User Manual
12
Mechanical Installation
No.
Description
No.
Description
1
Compressor
11
Schrader valve
2
Discharge temperature sensor
12
Filter dryer
3
High pressure sensor
13
Sight glass
4
High pressure switch
14
Schrader valve
5
Schrader valve
15
Electronic Expansion Valve (EEV)
6
Ball valve
16
Schrader valve
7
Check valve+
17
Evaporator coil
8
Condenser coil
18
Suction temperature sensor
9
Solenoid valve+
19
Low pressure sensor
10
Ball valve
20
Schrader valve
Figure 3-1 Air-cooled System Arrangement Diagram
Vertiv | Liebert® CRV4 | User Manual
13
Mechanical Installation
The following points should be considered before checking out the overall layout diagram
•
: Factory piping
•
: Field piping (by technical personnel)
•
Components (marked with *) are not supplied by Vertiv and are recommended for proper circuit operation
& maintenance.
•
Additional components (marked with +) are required when the equivalent length exceeds 30 m.
3.1.2. System Installation Mode
The installation modes of the Liebert® CRV4 series unit are shown in Figure 3-2 and Figure 3-3.
No.
Description
No.
Description
1
Outdoor unit
7
Heat insulation floor
2
Back bend (must be higher than the highest copper pipe of the condenser)
8
Floor
3
Liquid line (avoid exposure to direct sunlight)
9
Condensed water out
4
Trap
10
Humidifier water in
5
Slope discharge
11
Raised floor
6
Sealed
12
Indoor unit
Figure 3-2 The Outdoor Unit is Placed Higher than the Compressors during Installation
Vertiv | Liebert® CRV4 | User Manual
14
Mechanical Installation
No.
Description
No.
Description
1
Outdoor unit
6
Humidifier water in
2
Slope liquid
7
Raised floor
3
Heat insulation floor
8
Indoor unit
4
Floor
9
Slope discharge
5
Condensed water out
10
Sealed
Figure 3-3 The Outdoor Unit is Lower than the Compressor during Installation
•
In Figure 3-2, the outdoor unit is installed higher than the compressor. Therefore, an inverted backbend is
fitted to the discharge line and the liquid line of the outdoor unit. The modification is essential as it helps
prevent the liquid refrigerant from flowing back once the outdoor unit (condenser) stops.
•
The top end of the inverted backbend must be installed higher than the ultimate level of the copper piping
of the outdoor unit. However, if the outdoor unit is installed lower then the compressor no modification is
required.
Vertiv | Liebert® CRV4 | User Manual
15
Mechanical Installation
3.1.3. Mechanical Parameters
The mechanical parameters of the indoor unit are displayed in Figure 3-4 and Table 3-1.
Figure 3-4 Dimensions of Indoor Unit
Table 3-1 Mechanical Parameters of Indoor Unit
Model
Dimensions (W × D × H)
mm
inch
Net Weight (kg)
CR025RA1N8S712E30000PV040
300×1100×2000
11.8"x43.3"x78.7"
235
CR025HA1N80S02E30000PV041
300×1200×2200
11.8"x47.2"x86.6"
255
CR035RA1N8S712E30000PV040
600×1100×2000
23.6"x43.3"x78.7"
320
CR035HA1N80S02E30000PV041
600×1200×2200
23.6"x47.2"x86.6"
350
CR045RA1N8S712E30000PV040
600×1100×2000
23.6"x43.3"x78.7"
335
CR045HA1N80S02E30000PV041
600×1200×2200
23.6"x47.2"x86.6"
365
(Including anchor bolts)
(Excluding anchor bolts)
(Including anchor bolts)
(Excluding anchor bolts)
(Including anchor bolts)
(Excluding anchor bolts)
Vertiv | Liebert® CRV4 | User Manual
16
Mechanical Installation
3.1.4. Base Plate Piping Location and Dimensions
The inlets and outlets locations of the piping on the unit base plate are shown in Figure 3-5.
No.
Description
No.
Description
1
Drain water hole of pump
8
Bottom cable inlet hole x3
2
Weight-drain water hole
9
Drain water hole of pump
3
Bottom cable inlet hole x2
10
Exhaust air hole of compressor
4
Exhaust air hole of compressor
11
Liquid inlet hole of evaporator
5
Liquid pipe inlet hole of evaporator
12
Weight-drain water hole
6
Water inlet hole of wet film humidifier
13
Water inlet hole of electrode humidifier
7
Water inlet hole of electrode humidifier
Figure 3-5 Location of the Piping Connection on the Base Plate
Vertiv | Liebert® CRV4 | User Manual
17
Mechanical Installation
3.1.5. Top Plate Piping Locations & Dimensions
The locations of the pipe inlets and outlets on the unit top plate are shown in Figure 3-6.
No.
Description
No.
Description
1
Top cable inlet hole
7
Drain water hole of pump
2
Top cable inlet hole
8
Top cable inlet hole
3
Top cable inlet hole
9
Water inlet hole of humidifier
4
Exhaust air hole of compressor
10
Drain water hole of pump
5
Liquid inlet hole of evaporator
11
Liquid inlet hole o evaporator
6
Water inlet hole of humidifier
12
Exhaust air hole of compressor
Figure 3-6 Location of the Piping Connection on the Top Plate
Vertiv | Liebert® CRV4 | User Manual
18
Mechanical Installation
3.1.6. Location of Front Air Outlets
The locations of the air outlets at the front are shown in Figure 3-7.
Figure 3-7 Locations of Front Air Outlets (unit: mm)
To prevent damage of the power cables due to wear and tear, the cable entry holes are fitted with bushes for
smoother routing of the cabling.
Vertiv | Liebert® CRV4 | User Manual
19
Mechanical Installation
3.2. Installation of the Indoor Unit
3.2.1. Leveling the Cabinet
Liebert® CRV4 is installed in-between the racks, with at least one side of the unit placed beside the server
racks. Once all the components of the cabinet have been installed, level the cabinet. The following section is a
step-by-step illustration of the process of leveling the cabinet:
1. Place the cabinet at the desired location (preferably a clean and flat ground). Use a movable wrench to
loosen the four fixing nuts on the four leveling screw rods in clockwise direction as shown in Figure 3-8.
2. Rotate the hexagon bolts on the bottom of the leveling feet counter-clockwise till the foot is raised or
lowered to the ideal position. Use a leveling meter to ensure that the cabinet is at an uniform level state.
Refer Figure 3-8 to understand the process better.
No.
Description
No.
Description
1
Fixing nut
2
Hexagonal nut
Figure 3-8 Leveling the Cabinet
3. Tighten the fixing nuts on the leveling feet by rotating them counter-clockwise to complete the level
adjustment. If there is a provision for mounting bracket in the equipment room, then the leveling feet must
be removed and the Liebert CRV4 unit should be fixed on the mounting bracket.
Vertiv | Liebert® CRV4 | User Manual
20
Mechanical Installation
3.2.2. Removing the Leveling Feet and Fastening
Before commencing the task of removing the feet and fixing the cabinet, it is vital that two personnel should
be assigned for this operation to avoid personal injury and cabinet damage.
Following are the instructions to be followed for removing the feet and fixing the cabinet:
1. Removing the feet
• Use a movable wrench to loosen the four fixing nuts on the four leveling screw rods one by one in a
clockwise direction.
• Rotate the hexagonal bolt at the bottom of the leveling feet in clockwise direction until the leveling feet can
be removed from the Liebert® CRV4 unit frame.
2. Fixing the cabinet
The cabinet has two holes (diameter: 13.5 mm) on its respective top, bottom, front, and rear as depicted in
Figure 3-9. Four bottom holes are bolted to the floor bracket in the equipment room. After four top holes are
bolted, they can be connected to the top bracket in the equipment room.
No.
Description
No.
Description
1
Top front fixing hole
3
Bottom front fixing hole
2
Top rear fixing hole
4
Bottom rear fixing hole
Figure 3-9 Fixing Holes of the Cabinet
Vertiv | Liebert® CRV4 | User Manual
21
Mechanical Installation
3.2.3. Assembly of the Cabinet Parts
Assembling the parts of the cabinet which are supplied with the Liebert® CRV4 unit accessories. This also
includes the cabinet connectors which is used to connect the unit with adjacent cabinets.
Before connecting the cabinet, level the cabinet as mentioned in the previous section (refer to section
‘Leveling the cabinet’ for in-depth information).
Procedures of fixing the cabinet
1. Loosen the fixing screw of the cabinet connector on the frame of the cabinet. Figure 3-10 shows magnified
view of the cabinet connector.
2. Rotate the cabinet connector by 90° to the horizontal position. Use M5 countersunk head screws to fix it on
the cabinet frame (side of the door lock), as depicted in right image of Figure 3-10.
No.
Description
1
Cabinet connector
Figure 3-10 Rotating the Cabinet Connector
3. Use the M5 countersunk head screws to fix the cabinet connectors (L-shaped) in the installation holes of
the cabinet frame (side of the hinge) and rack frame adjacent to the cabinet as shown in Figure 3-11.
Vertiv | Liebert® CRV4 | User Manual
22
Mechanical Installation
No.
Description
No.
Description
1
Mounting screw M5x12
2
Cabinet connector
Figure 3-11 Schematic Diagram for Connecting the ( L-shaped ) Cabinet Connector
4. Install the other six cabinet connectors based on the same method explained in steps 1 to 3.
3.3. Unit Piping Installation
There are four kinds of piping to be joint as follows:
• Condensed water drainage piping connection of the indoor unit
• Electrode humidifier water inlet piping connection
• Connection of the copper piping (discharge and liquid pipes) between the indoor and outdoor units
• Long piping kit (optional)
The following points need to be taken into consideration during the piping process:
•
All the joints of the refrigerating piping must be silver-brazed.
•
The selection, layout, and fixing of the piping should comply to the industry standards and norms.
•
Vacuum pumping, refrigerant charging operations and procedures must comply to the industry
standards.
•
Pressure drop, compressor oil return, noise, and vibration must be considered during the designing and
installation process.
Vertiv | Liebert® CRV4 | User Manual
23
Mechanical Installation
3.3.1. Removing Filter Net
1. Prior to connecting the piping of the indoor unit, ensure to remove the filter net.
2. Open the rear door of the cabinet to reveal the two filter nets on the top and the bottom panels of the unit.
3. First loosen the fixing screws on the fixing flake of the filter net, then remove the fixing flake to further
remove the top filter net.
4. Use the same steps (1 to 3) to remove the bottom filter. Figure 3-12 shows the process of removing the filters.
No.
Description
No.
Description
1
Mounting screw M5x8
2
Fixing flake of the filter
Figure 3-12 Removing the Filters Nets
3.3.2. Connecting the Condensate Water Drainage Piping of the Indoor Unit
The condensed water of the electrode humidifier and the evaporator converge to a common water pan
following which it is drained through the drainage pipe of the drain pump.
1. The unit is configured to adopt the bottom drain mode by default; therefore, to drain water from the bottom,
direct/ route the soft drainage pipe through the drainage hole of the pump, and then connect it to the outer
drainage pipe.
2. For the unit with top piping connection: If user wants to drain water from the top of the unit, then user needs
to connect the drainage pipe of the drainage pump outlet to the top drain water copper pipe. A check valve
should be installed on the connecting part between the top drain water copper pipe and the connecting
piping of the system.
3. This prevents the backflow of the water in the connecting pipes to the water pan. User can use a clamp from
the accessories box to fix the drain pipe to the drain connector, and the fixing torque is 15 kg.cm, refer
Figure 3-13 for better understanding.
Vertiv | Liebert® CRV4 | User Manual
24
Mechanical Installation
4. Then connect the drain pipe at the drainage hole located on the top of the cabinet (pipe connector has been
installed, 1/2”-BSP) as shown in Figure 3-6.
5. Regardless the water is drained from the upper or the lower parts of the unit through water pump, the check
valve must be installed at the exit of the unit.
The outer diameter of the copper pipe is 12.7 mm and an internal diameter of the hose pipe is 9 mm. However,
if the unit is not configured with the pump, the drainage pipe of the water pan should go through the
drainage hole of the pan and must connect to the outer drainage pipe. The water-trap is essential to drain the
condensate water.
The following points are to be taken into consideration about the water-trap:
•
Adopt a galvanized steel, PVC, or polyethylene pipe with a fair amount of flexibility.
•
Allow a slope of 2% towards the direction of the drainage flow
No.
Description
No.
Description
1
Weight-drain water hole
7
Weight-drain water hole
2
Liquid inlet hole of evaporator
8
Bottom cable inlet hole
3
Exhaust air hole of compressor
9
Exhaust air hole of compressor
4
Drain water hole of pump
10
Liquid inlet hole of evaporator
5
Bottom cable inlet of pump
11
Water inlet hole of wet film humidifier
6
Drain water hole of pump
Figure 3-13 Connection of the Drain Piping
Vertiv | Liebert® CRV4 | User Manual
25
Mechanical Installation
The water-trap is mandatory and should be located 30 cm below the condensate-drain-pan and the water-trap
must be installed in the floor under the unit The pan must be kept under the removable floor. Figure 3-14 shows
the arrangement of the water-trap and condensate drain pan.
No.
Description
No.
Description
1
Water trap
3
Charge water
2
Condensate drain pan
Figure 3-14 Draining the Condensate Water
•
Do not cut-off the brackets of the water-trap, otherwise the drainage of the condensed water will be
affected.
•
Prior to startup, fill the charge water in the water-trap to avoid blowing the water.
•
To avoid water leakage, use a Teflon sealing tape between flexible pipes and connectors.
•
The electrode humidifier contains flowing hot water; thus, the plastic pipe must be resistant to heat higher
than 90 °C.
3.3.3. Electrode Humidifier Water Inlet Piping Connection
By default, the water inlet pipes should be connected to the electrode humidifier from the bottom. If the water
has to be filled from the bottom, then there is no need to change the water inlet piping connection in the unit. In
this case, only connect a water inlet pipe to the water inlet hole located at the base of the cabinet, as shown in
Figure 3-15.
However, if the water has to be filled from the top, unscrew the connector of the water inlet hose pipe of the
humidifier. The water inlet hose pipe needs to be routed through the rubber plug hole close to the humidifier
and then connect it to the outer water inlet pipe. Screw a threaded connector onto the water inlet pipe to
complete the fixing process. Other connecting modes can also be selected by the engineering methodologies,
but the connections must be sealed to avoid water leakage. The pressure range of the main pipe should be
in the range of 100 kPa to 700 kPa. If the pressure exceeds 700 kPa, then there should be an arrangement of
pressure reducer. If the pressure falls below 100 kPa, a water tank and pump system should be fitted.
Vertiv | Liebert® CRV4 | User Manual
26
Mechanical Installation
In some cases, the process needs to be in compliance with the local laws and regulations resulting in the
installation of some other supporting components, for more details consult Vertiv representative.
No.
Description
1
Humidifier inlet hole
Figure 3-15 Electrode Humidifier Water Inlet Pipe Connection from Bottom
3.3.4. Connection of the Copper Piping between the Indoor and Outdoor Units
• The indoor and outdoor units are connected through brazed copper piping. Select the appropriate
dimension (pipe diameter) of piping connecting the indoor and the outdoor unit. Considering the effect
of the diameter of copper piping on the pressure drop of the system, the pipe dimensions of the indoor
and outdoor units should be determined according to the specifications in Table 3-2 or contact Vertiv
representative.
• The unit has refrigerating pipe connectors and labels on its top and bottom as shown in Figure 3-16 and
Figure 3-17. Notes and instruction labels are pasted onto the discharge and liquid piping. Therefore, ensure
that the piping must be wrapped with a wet cloth before brazing to protect the labels from burning.
• Connect the discharge pipe and liquid pipe of the indoor unit according to the instructions on the labels.
• Horizontal sections of the discharge pipe should be sloped down from the compressor with a slope of at
least 1:200 (5 mm down for each 1 m run). The discharge pipes should be insulated where they are routed in
the conditioned space (including under a raised floor).
Vertiv | Liebert® CRV4 | User Manual
27
Mechanical Installation
Table 3-2 Recommended Pipe Sizes (unit: mm)
Model
CR025
CR035
CR045
Pipe Length
D
L
D
L
D
L
10m
19
12.7
19
16
22
16
20m
19
16
22
16
25
19
30m
22
16
25
16
28
19
40m*
22
16
25
19
28
22
50m*
22
19
25
22
28
22
•
A long piping kit is required for Equivalent Length marked with *.
•
D: Discharge line; L: Liquid Line
•
If the pipe length exceeds 50 m or drops over 30 m, consult Vertiv representative for details.
•
If the outdoor environment temperature is lower than -20 °C, a low-temperature kit is needed, consult
Vertiv representative for details.
No.
Description
No.
Description
1
Top cable inlet hole
6
Top cable inlet hole
2
Exhaust air hole of compressor
7
Exhaust air hole of compressor
3
Liquid pipe inlet hole of evaporator
8
Liquid pipe inlet hole of evaporator
4
Drain water hole of pump
9
Drain water hole of pump
5
Water pipe inlet hole of humidifier
10
Water pipe inlet hole of humidifier
Figure 3-16 Top Plate Piping Connection
Vertiv | Liebert® CRV4 | User Manual
28
Mechanical Installation
No.
Description
No.
Description
1
Weight-drain water hole
7
Weight-drain water hole
2
Liquid pipe inlet hole of evaporator
8
Bottom cable inlet hole
3
Exhaust air hole of compressor
9
Exhaust air hole of compressor
4
Drain water hole of pump
10
Liquid pipe inlet hole of evaporator
5
Bottom cable inlet hole
11
Water pipe inlet hole of wet film humidifier
6
Drain water hole of pump
Figure 3-17 Bottom Plate Piping Connection
For bottom piping: before brazing the compressor discharge pipe and liquid pipe, follow the instruction
labeled on the copper pipe; cut the copper pipe using a cutter (a little bit of the compressor lubricant oil may
leak); however, do not braze the copper cap on the seal directly as it may result in heating of the oil following
which it may catch fire.
The exposure time of system piping must not exceed 15min. Longer exposure will lead to the compressor
lubricant oil being affected by moisture, which can affect the life of the key components and the system
operation stability.
Vertiv | Liebert® CRV4 | User Manual
29
Mechanical Installation
3.3.5. Installing Long Piping Kit (for site installation)
There are instances where the one-way equivalent length of the pipe exceeds 30 m. Or suppose the vertical
distance between the outdoor and the indoor units exceeds the value in Table 3-3. Prior to installation, consult
Vertiv representative whether to use the long piping kit and for the equivalent length of the recommended pipe
(consider the resistance loss calculation at the bends). The equivalent length of each kit is shown in Table 3-4,
and should be selected according to the field condition.
Table 3-3 Vertical Distance between the Indoor and Outdoor Units
Items
Distance
Maximum equivalent lengths from the indoor unit to the outdoor
50 m
Outdoor unit is higher than the Indoor unit
Maximum: 30 m
Outdoor unit is lower than the indoor unit
Maximum: 8 m
Traps on the vertical refrigerant discharge pipe
Install trap every 7.5 m
Table 3-4 Equivalent Length of the Partial Components
Equivalent Length (m)
Outer Diameter (OD) of the Liquid Pipe
(inch)
90° bend
45° bend
T Type 3-way
3/8
0.21
0.10
0.76
1/2
0.24
0.12
0.76
5/8
0.27
0.15
0.76
3/4
0.3
0.18
0.76
7/8
0.44
0.24
1.1
1-1/8
0.56
0.3
1.4
•
If the vertical distance between indoor and outdoor units exceeds the values in Table 3-3, consult Vertiv
representative.
•
‘U’ trap should be installed for every 7.5 m of vertical distance, consult Vertiv representative for details.
•
There is no necessity of cutting the indoor unit piping while installing the solenoid valve.
After the entire system is installed, open the ball valve to keep the pressure and carry out the vacuum
operation, thereby avoiding the moisture absorption of the compressor lubricant oil. Thus, it accounts for
operational safety and also extends the service life of the compressor; for electrical connections related to the
long piping kit, refer to Chapter 4 Electrical Installation.
Vertiv | Liebert® CRV4 | User Manual
30
Mechanical Installation
3.3.6. Check Valve Installation
The check valve must be installed closely to the indoor unit, attention should be paid to the arrow on the valve
body while brazing the check valve. The arrow indicates the flow direction of refrigerant in the valve body as
shown in Figure 3-18. Ensure that the arrow points towards the outdoor unit.
Figure 3-18 Horizontal Check Valve Installation
3.3.7. Installing the Solenoid Valve
The solenoid valve must be installed closely to the indoor unit. The solenoid valve is supplied loose to install at
the site. Mount the solenoid valve horizontally in the refrigerant piping as shown in Figure 3-19. Ensure that the
arrow points towards the indoor unit, as the arrow indicates the flow direction of the refrigerant in the valve.
Figure 3-19 Horizontal Solenoid Valve Installation
After brazing, install the coil and remove the cover of the cabling terminals. Direct the cable through the
cable hole in the cover and plug the two terminals and reinstall the cover. Figure 3-20 shows the process of
connecting the cables of the solenoid valve in a liquid pipe
Vertiv | Liebert® CRV4 | User Manual
31
Mechanical Installation
Figure 3-20 Position of Cable Terminals the Solenoid Valve
Finally, mount the coil on the valve body and press the coil tightly to ensure complete contact between the coil
and valve body is firmly done for better understanding refer Figure 3-21.
Figure 3-21 Assembly of the Coil and Solenoid Valve
Vertiv | Liebert® CRV4 | User Manual
32
Mechanical Installation
3.4. Charging Refrigerant and Adding Lubricant Oil
3.4.1. Charging Refrigerant
The Liebert® CRV4 air-cooled series air conditioner is charged in the factory with 2 bar nitrogen for shipping.
Table 3-5, Table 3-6 and Table 3-7 are the standard refrigerant charge for outdoor (Vertiv™ Liebert® LSF/
Vertiv™ Liebert® LVC) and indoor units respectively.
Table 3-5 Refrigerant Charging Amount of the Liebert LSF Outdoor Unit (unit: kg)
Outdoor Unit Model
LSF38
LSF42
LSF52
LSF62
LSF76
LSF85
Recommended charging amount
3.93
4.12
5.12
5.86
6.72
7.9
Table 3-6 Refrigerant Charging Amount of the Liebert LVC Outdoor Unit (unit: kg)
Outdoor Unit Model
LVC088
LVC106
LVC140
LVC152
LVC170
Recommended charging amount
4.12
5.12
5.86
6.72
7.90
Table 3-7 Refrigerant Charging Amount of the Indoor Unit (unit: kg)
Indoor Unit Model
CR025
CR035
CR045
Standard charging amount
2.47
3.12
3.44
The recharged amount of the refrigerant is calculated using the following formula:
Refrigerant refilling amount (kg) = Recommended refrigerant charging amount of outdoor unit + recommended
refrigerant charging amount of indoor unit + refrigerant charging amount of per meter liquid pipe (kg/m) × total
length of liquid pipe (m)
Refer to the Table 3-8 for the refrigerant recharging amount of per meter liquid pipe for different ODs:
Table 3-8 Amount of Refrigerant per Unit Length of Liquid Pipe
Liquid Pipe
OD (mm)
Refrigerant Recharging Amount Liquid Pipe
of per meter Liquid Pipe (kg/m) OD (mm)
Refrigerant Recharging Amount of
per meter Liquid Pipe (kg/m)
12.7
0.107
22
0.321
16
0.174
25
0.431
19
0.245
28
0.517
For the refrigerant charging method, refer to Section 5.2.2 Commissioning Procedures.
Vertiv | Liebert® CRV4 | User Manual
33
Mechanical Installation
3.4.2. Adding Lubricant Oil
The charging refrigerant can dilute the lubricant oil in the system and affects the lubricating & cooling
properties of the lubricant oil. Therefore, the lubricant oil should be added in the beginning. The lubricant oil
used in the Liebert® CRV4 air conditioner is given in Table 3-9.
Table 3-9 Types of Lubricant Oil
Unit Model
Types of Lubricant Oil
CR025
POE (32-3MAF)
CR035
PVE (FVC68D)
CR045
POE (32-3MAF)
Table 3-10 provides the amount of lubricant oil to be added.
Table 3-10 Adding Lubricant Oil
CR025, CR035, CR045
Liquid Pipe OD
(mm)
30 m
>30 m
12.7
16
19
22
Lubricant oil charging is
not needed
Amount of lubricant oil (ml) to
be added = More than 30 m
part even pipe added amount of
refrigerant × 10%
25
•
Consult Vertiv representative for more details on adding the lubricant oil.
•
CR025 and CR045 units use POE type (32-3MAF) lubricant oil, and CR035 units use PVE type (FVC68D)
lubricant oil
•
Do not use inferior quality refrigerant.
•
For any consequences resulting from inferior quality refrigerant, Vertiv does not assume warranty
responsibility.
•
Select the type of lubricant oil in accordance with the compressor manufacturer’s specification.
Vertiv | Liebert® CRV4 | User Manual
34
Mechanical Installation
3.5. Removing Transportation Fastener and Vibration Absorber
The fasteners and vibration absorbers are mounted on the equipment to protect partial components from
getting damaged and distorted due to bumping, impact, and resonance. Removal of these fasteners and
absorbers is necessary before installation and commissioning the unit.
• Removing retaining metal plates to fix the compressor in transit
Damping rubber pads are installed on the compressor’s feet to buffer the compressor vibration in operation
and reduce the vibration noise, but rubber pads cannot appropriately handle the shaking of the compressor
in transit, thus resulting in loosening of related connecting pieces and wear of some parts. To avoid these
possible problems, retaining metal plates are mounted on the three feet (two feet in case of CR025) to fix the
compressor before shipment.
CRO25
No.
Description
1
Retaining Metal Plates
CR035
CR045
Figure 3-22 Retaining Metal Plates
After installation and before commissioning of the units, remove all the retaining metal plates, and then mount
bolts and gaskets in the reverse order to that of installation.
• Removing pipe fastener
If the copper pipe gets close to the metal plate, it may result in wear and tear of the copper pipe. To prevent this
from occurring, vibration absorbers are fitted between them. However, these objects need to be removed and
then the area must be cleaned prior to installing and commissioning.
Vertiv | Liebert® CRV4 | User Manual
35
Mechanical Installation
• Removing limiting piece of the electrical control box
The electrical control box may move during transportation. To prevent this abrupt movement, a limiting piece of
the electrical control box is installed before delivery. The limiting piece has to be removed before operating the
unit so that the maintenance personnel can slide out the electrical control box during maintenance.
• Adjusting the supply air baffle
Adjust the installation direction of the supply air baffle to lead wind to the left or right depending on the
installation location of the Liebert® CRV4 series air conditioners. The supply air baffle is composed of several
pieces. Remove the screws on both sides of the single piece of the supply air baffle, rotate it by 180°, then Install
it back to change the wind direction. Figure 3-23 shows the location of the mounting screws of a single piece of
the supply air baffle.
No.
Description
1
Screw of M5x12
Figure 3-23 Fixed Mode of the Supply Air Baffle
Vertiv | Liebert® CRV4 | User Manual
36
Mechanical Installation
3.5.1. Sealing the Holes of the Top Plate of the Cabinet
Holes are reserved at the top of the cabinet to facilitate smooth on-site installation as well as the connection
of the rack on the top of the machine room. After the cabinet is installed on the site, seal the remaining holes
using rubber plugs and bolts. Use M13.5 rubber plugs to seal four holes at the top of the cabinet and M12x30
bolts to seal 8 holes at the top plate of the cabinet. This prevents water from entering the cabinet.
Figure 3-24 shows the sealing the holes on the top plate of the cabinet.
No.
Description
No.
Description
1
Use the provided four M13.5 rubber plug to seal the
holes
3
Use the provided four M13.5 rubber plug to seal the
holes
2
Use the provided four M12x30 bolt to seal the holes
4
Use the provided four M12x30 bolt to seal the holes
Figure 3-24 Sealing the Top Holes of the Cabinet
Vertiv | Liebert® CRV4 | User Manual
37
Mechanical Installation
3.6. Checklist for Completed Mechanical Installation
Following are the particulars in the checklist (refer Table 3-11) that need to be verified and confirmed to ensure
that the mechanical installation was implemented successfully:
Table 3-11 Mechanical Installation Inspection Checklist
Particulars
Confirmation
Sufficient space is reserved for the maintenance activities according to the user manual.
The equipment is installed vertically and the installation fasteners have been fixed.
The connecting piping between the indoor and outdoor units are installed and the ball valves at
the indoor and outdoor units are fully opened.
The airflow direction of the air baffles have been adjusted (if necessary).
The condensate drain pipe is firmly connected.
Water supply pipe is connected to the electrode humidifier.
All pipe connectors are firmly fixed.
The fasteners used for the transportation have been removed.
All connected copper and water pipes shall be insulated properly.
Irrelevant things (such as transportation material, structure material, and tools), inside or around
the unit have been cleared after the unit is installed.
After all the particulars are checked and confirmed, perform the electrical installation operation.
Vertiv | Liebert® CRV4 | User Manual
38
Electrical Installation
Chapter 4: Electrical Installation
In this chapter, the electrical installation of the Liebert® CRV4 air-cooled units is explained in-depth to help
users with the various activities, which include work introduction and installation notes, connecting cables of
the indoor unit, and the installation inspection.
•
Liebert CRV4 series is a range of sophisticated devices used in industrial, commercial, or other
professional occasions. It is not tailored for the general public. The total rating power is larger than 1 kW
and is in accordance with the IEC61000-3-12 standards. Hence, a port of less than a 350-short-circuit is
required between the user power and the grid.
•
Permission is required from the power supply department to ensure that the air conditioner is connected
to a power no less than 350 circuit ratio.
4.1. Task Introduction and Notes
4.1.1. Cables to Connect On-site
1. Power cable and control cabinet of the indoor unit
2. Input and output control cables of the unit
3. Outdoor unit (air-cooled series): signal control cable and power cable
4. Solenoid valve cable of the long piping kit (an optional requirement)
4.1.2. Installation Notes
1. The connections of all the power cables, control cables, and ground cables should be in compliance with the
local and national electrical regulations.
2. Observe the unit name-plate for the full load current. The cables sizes must meet the conditions as specified
in the local cabling protocols and rules.
3. Mains supply requirement: 380 V to 415 V ± 10%; 50 Hz/ 60-Hz, 3N4. The power soft cable is a Y-type connection. If damaged, it has to be replaced immediately to eliminate the
dangers. The replacement procedure must be carried out by an authorized professional or experienced
service personnel.
5. The electrical installation and maintenance must be carried out by some authorized personnel or a trained
engineer well-versed with the inner workings of the electrical connection (for example, a service engineer
from the manufacturer’s side).
6. Prior to the cabling, a voltmeter must be used to measure the power supply voltage and ensure that the
power supply has been switched Off.
7. Use screws, guide rails, or other modes to fix the device firmly during the installation process to avoid
movement or shaking during the start-up or operation mode.
Vertiv | Liebert® CRV4 | User Manual
39
Electrical Installation
8. For the air conditioner configured with EC fans, the unit power grid adheres to the TN or TT star connection
power distribution system. However, if there is a need to configure another type of power grid, contact the
Vertiv representative for the same.
9. An appropriate all pole disconnection device must be supplied.
10. For SCCR of the Liebert® CRV4 air-cooled unit: observe the name-plate.
11. The power soft cable should not be lighter than an ordinary PVC-sheathed cable, which is 53 line according
to GB5023.1 (idt IEC60277).
12. For appliance of outdoor: the power cable should not be lighter than Chloroprene rubber sheathed flexible
cord, which is 57 line according to IEC 60245.
4.2. Liebert CRV4 Cable Connection of Indoor Unit
4.2.1. Electrical Port Location of the Indoor Unit
For any model in the Liebert CRV4 series, open the rear panel of the indoor unit following which the specific
layout and locations of the low voltage components can be viewed as shown in Figure 4-1. For detailed layout
information on low voltage components, refer to the labels on the cabinets and units.
No.
Description
No.
Description
1
Rear door
3
Main circuit breaker (MCB)
2
Connect to control cable
Figure 4-1 Cable Connection of the Electrical Control Box and the Terminals
Vertiv | Liebert® CRV4 | User Manual
40
Electrical Installation
Table 4-1 MCB Current for the Models
Model
MCB
Current [ampere (A)]
CR025
NDM1-63C40/3
40
CR035
NDM1-63C50/3
50
CR045
NDM1-63C63/3
63
4.2.2. Connecting the Power Cable of the Indoor unit
The specific location of the power port of the indoor unit is shown in Figure 4-1. Connect the supply terminals
L1-L3, N, and PE to their respective counterparts of the external power supply respectively. Fix the input cables
to the cable clamp, located on the inner side panel of the unit. The top cable entry and bottom cable entry
holes are shown in Figure 4-2.
For the cable specifications, refer to the full-load current (FLA) described in the Table 4-2.
CR025
CR035 & 045
No.
Description
No.
Description
1
Top cable inlet holes
3
Top cable inlet holes
2
Bottom cable inlet holes
4
Bottom cable inlet holes
Figure 4-2 Top and Bottom Cable Entry Holes
The cable sizes must strictly meet and adhere to the local cabling regulations and protocols as it supersedes
every type of connection.
Vertiv | Liebert® CRV4 | User Manual
41
Electrical Installation
Table 4-2 Full Load Current [unit - ampere (A)]
Model
Standard
Model
Standard Model
with Electrical
Heater
Standard Model
with Humidifier
Standard Model with
Electrical Heater and
Humidifier
CR025R/HA
21.7
22.7
23.4
23.4
CR035R/HA
29.3
36.9
30.8
36.9
CR045R/HA
39.1
44.3
39.1
44.3
4.2.3. Connecting the Control Cables
The location of the terminal block for on-site cable connections is shown in Figure 4-1. The enlarge view of the
terminals are shown in Figure 4-3.
Figure 4-3 The Enlarged View of the Terminals
Vertiv | Liebert® CRV4 | User Manual
42
Electrical Installation
The description of terminals and ports shown in Figure 4-3
Terminals and Port
Description
51, 24
Water-under-floor-sensor
37, 38
Remote On/ Off
70, 71
Control cable of outdoor unit
75, 76
Common alarm
61, 62
Can communication
63, 64
Solenoid valve of liquid route
A2, B2, 12V, GND
SIC Card
TB3
Rack sensor
The connection personnel must take anti-static measures before connecting the control cables
4.2.4. Water-under-floor Sensor
If a water-under-floor sensor is configured, connect one end of the sensor to terminal 51# and the other end
to common terminal 24#. Each unit can be connected with multiple sensors in parallel, but there would be only
one water-under-floor sensor alarm.
4.2.5. SIC Card
If a SIC card is configured, connect A#, B#, GND#, and 12# on the SIC card to the respective counterparts
on the terminal block. Either SIC card can be configured based on the user requirement. Refer to Appendix 1
Circuit Diagram for detailed information.
4.2.6. Rack Temperature Sensor
Each air-cooled unit can be connected with a maximum of 6 temperature sensors It is recommended that
the sensors be located in front of the heat-loads to achieve the most precise temperature. If the sensors are
connected in series (refer Figure 4-4), each temperature sensor monitors the temperature of air entering each
rack, and the read temperature value is used to control unit operation. The standard location of the sensor is
1.5 m height from the base of the unit. Therefore, the sensors should be placed in positions as shown in
Figure 4-4, or the devices cannot operate appropriately.
Vertiv | Liebert® CRV4 | User Manual
43
Electrical Installation
No.
Description
1
Temperature sensor
Figure 4-4 Layout of Rack Temperature Sensors
Following is the procedure to connect sensors for Liebert® CRV4 models:
1. Insert the connector of the rack temperature sensor in the TB3 point. On connecting the cable, route the
cable through the top or bottom of the unit following which it should be connected to the first sensor.
Connect the first sensor to the second sensor. Thus, the sensors are connected in a daisy-chain.
2. Fix the temperature sensor in front of the hottest source inside the rack. Do not fix it in front of the empty
sub-rack. Affix the sensor on the rack surface using the magnets provided in the kit. The sensor must be
fixed in a position that is mostly short of cool air.
Rack temperature sensor IRM-S02TH address settings are given in the Table 4-3.
Table 4-3 IRM-S02TH Address Setting
Sensor
1
2
3
4
5
6
ID
Rack temperature 1
0
0
0
1
0
0
10
Rack temperature 2
0
0
0
1
0
1
11
Rack temperature 3
0
0
0
1
1
0
12
Rack temperature 4
0
0
0
1
1
1
13
Rack temperature 5
0
0
1
0
0
0
20
Rack temperature 6
0
0
1
0
0
1
21
Vertiv | Liebert® CRV4 | User Manual
ON — “1”;
OFF — “0”
44
Electrical Installation
4.2.7. Remote Shutdown
As shown in Figure 4-3, terminals 37# and 38# can be connected to the remote shutdown switches. The
terminals must be short-connected before delivery. If a remote shutdown terminals are connected at the time of
commissioning, remove the short-connect cable. Closing the terminals 37# and 38# will shut down the unit.
4.2.8. Control Signals of the Outdoor Unit
Terminals 70# & 71# are the control signal input terminals of the outdoor unit. Their On and Off state is same
as that of the compressor. They can be connected to the compressor rotation speed control terminals on the
control board of the outdoor unit. However, connecting them is an option depending on the requirement.
4.2.9. External General Alarm
Terminals 75# and 76# can be connected to the external general alarms. They generate signals to external
alarm devices such as an alarm indicator. When the critical alarm occurs, the contact will be closed to trigger
remote alarms, send signals to the building management system, or dial the paging system automatically.
The users have to obtain the power supply of external general alarm system. For a in-depth definition of the
other terminals, refer to the Circuit Diagram in the Appendix 1.
4.2.10. Connecting the Solenoid Valve of the Long Piping Kit- (Optional for site
installation)
The solenoid valve of the long piping kit consists of two control cables which are connected to their respective
terminals on the control board. For more specific connecting points on the interface board, refer to the
connecting terminal number of the liquid route solenoid valve shown in the Circuit Diagram in the Appendix 1
section.
4.2.11. Teamwork Control
If user need to use the teamwork control function, user should connect the communication cables to terminals
61# & 62# on the TB2 terminal block.
Vertiv | Liebert® CRV4 | User Manual
45
Electrical Installation
4.3. Electrical Installation Checklist
Confirm the particulars listed in Table 4-4 on completion of the electrical installation.
Table 4-4 Electrical Inspection Checklist
Particulars
Confirmation
The power supply voltage meets the rated voltage on the name-plate of the unit.
The system electrical loop has no open-circuit or short-circuit exists in the electrical connection.
Confirm, if the power cables and ground cables are connected to the breaker switches, indoor
unit, and outdoor unit are correct as per the norms.
The ratings of the MCBs and fuses are correct (refer Table 4-1 to select suitable MCB or fuses).
The control cables are configured and subsequently, fixed properly.
All the cables and connector connections, including the fixing blocks, are firmly fixed and
appropriately.
Control transformer setting matches the incoming power.
After confirming the above particulars, user can start the commissioning of the unit.
Do not power on the unit until Vertiv authorized technical personnel has checked and confirmed all
the parameters of electrical installation in the unit are correct.
Vertiv | Liebert® CRV4 | User Manual
46
Start-up Commissioning
Chapter 5: Start-up Commissioning
This chapter introduces the system start-up commissioning, including location of MCBs, and power-on
commissioning.
5.1. Location Of MCBs
The locations of the MCBs of Liebert® CRV4 air-cooled air conditioner are shown in Figure 5-1, the MCBs of
different units should be differentiated according to the labels indicated on the terminals.
No.
Description
No.
Description
1
Compressor MCB
4
Fan MCB
2
Electrical heater MCB
5
Humidifier MCB
3
Transformer MCB
Figure 5-1 MCBs Location
Vertiv | Liebert® CRV4 | User Manual
47
Start-up Commissioning
5.2. Power-On Commissioning
5.2.1. Preparation Before Commissioning
• Mechanical part
1. Follow the instructions labeled on the valve to open all valves in the refrigerant loop.
2. The refrigerant piping system has cleared the pressure leakage test.
3. Ensure the refrigerant is properly charged in the system.
4. Ensure that the total system charge has been roughly accounted. If the charge is less than the base charge
allowed, additional lubricant oil should have been added into the system.
5. The water supply and drain pipes of the humidification system have been connected, the material
requirement is met and the leakage detection has been installed.
6. The crankcase heater of the compressor has been preheated for over 12hours.
7. The equipment room is above 18 °C with certain heat-load. Otherwise, warm up the equipment room with
any heating device, or by manual running the heaters of the unit (in this case, go through the following
procedures till the third step of Section 5.2.2 Commissioning Procedure) and of other equipment in the room.
Ensure sufficient heat-load for the commissioning.
8. During low ambient conditions, it may be necessary to manually raise the condensing pressure up to 21 bar
by manually shielding some condensing area to limit the condensing air volume.
• Electrical part
1. Ensure that the voltage of the main power supply is within ±10% of the rated voltage, and the isolation switch
of the air-cooled condenser of the outdoor unit has been closed.
2. Ensure that all electrical or control connections are correct, and all electrical and control connectors are
tighten.
3. Ensure that the power cable and the low-voltage control cables are separately arranged.
4. Ensure that the high-water-level cables are correctly connected and the pump operates correctly.
5.2.2. Commissioning Procedures
1. Turn-Off all the MCBs of various parts. Turn-On the isolation switches and control MCBs. Check and confirm
that the control voltage is 24 Vac ±10%.
2. Turn-On the fans’ MCBs to check if the fans run normally. Measure the operational phase-currents of the all
fans.
3. Vacuum in system loop: Connect the compound pressure gauge to the corresponding high and low pressure
schrader valves. Evacuate the cooling system vacuum to -30 in. Hg (-1.02 bar; pumping time: >3hr), and
hold the state for 4hr. The pressure should not rise, and the color of the sight glass is normal (to ensure the
cooling system vacuum and dry effect, evacuate the cooling system repeatedly at least three times). If there
is a hydraulic solenoid valve in the system, user needs to choose vacuum in manual mode, and then vacuum
after opening the solenoid valve.
Vertiv | Liebert® CRV4 | User Manual
48
Start-up Commissioning
4. Charging refrigerant
• Static charging (before turning on the unit):
After vacuum inspection, immediately charged the cooling system with proper amount of liquid refrigerant
(generally charge until the pressure in the tank is balanced with the system pressure).
Connect the high/low pressure meter to the refrigerant cylinder, and the connection soft pipe of the pressure
meter should be vacuumed.
Connect the high/low pressure meter to the interfaces of the schrader valve near the liquid ball valve and
electronic expansive valve, keep the refrigerant cylinder up-side-down during static charging process.
• Do not turn-On the unit immediately after static charging:
Prior to turning On the unit, ensure to warm-up the crank box of the compressor for more than 12hours, if the
warming-up time is insufficient, use a drier or other safe heating source to heat the bottom of the compressor
shell for about 30min so as to evaporate any liquid refrigerant.
For CR035 model, it is prohibited to charge the refrigerant from the schrader valve of air suction pipe of
the compressor, otherwise, any damage caused by following wrong operation procedure, Vertiv does not
assume warranty responsibility.
•
Vacuum the soft connection pipe of the pressure meter.
•
After charging the refrigerant, do not turn-On the unit immediately to avoid any damage to the
compressor with liquid.
•
For healthy work environment, wear ear mask or ear plug to protect your hearing after entering the
equipment room.
• Dynamic charging:
Put the refrigerant cylinder upside down, manually start the compressor ( Fan output 60% and compressor
output 72%) to perform dynamic charging.
After the compressor starts, dynamically charge the refrigerant (R410A) until there is no bubble in the sight
glass and the condensation super cooling reaches more than 3 K and air suction superheat reaches more than
7 K.
Observe the compressor air suction pipes, ensure the pipe and compressor shell have no condensation to
exclude potential liquid strike risks and the unit air exhaust superheat should be within the range of
25 °C to 50 °C.
Vertiv | Liebert® CRV4 | User Manual
49
Start-up Commissioning
5.3. Inspection After Commissioning
Once the commissioning is completed, the Vertiv engineers will confirm the same using the checklist in
Table 5-1.
Table 5-1 After Commissioning Inspection Checklist
Particulars
Confirmation
Check all outputs are functional.
Check that the temperature & humidity settings as well as the control precisions are configured
correctly within range.
Check and confirm that all the output functions are automatic.
Is there any abnormal alarm.
Ensure that electrical installation checklist is confirm, refer Table 4-4.
Vertiv | Liebert® CRV4 | User Manual
50
Micro-Controller (Color Screen)
Chapter 6: Micro-Controller (Color Screen)
This section introduces the controller features, control screen details, basic system maintenance, and routine
troubleshooting which enables the customer to understand the functioning of the unit. It helps user gain insight
into the inner workings of the product comprising the information such as System setup, Alarm menus, and
Basic operations of the controller interface.
6.1. Features
Following are the features of the micro-controller:
1. The micro-controller is used for monitoring and displaying the operation status of the Liebert® CRV4 unit to
keep the environment within a setting range.
2. The Liebert CRV4 air conditioning is configured with 7-inch HMI color screen, which makes user interface
operation simple.
3. It provides a three-level password protection to effectively prevent unauthorized operation.
4. It provides the functions, including self-recovery upon power failure, high voltage and low voltage protection,
phase loss and anti-phase protection.
5. User can accurately understand the main parameters and operating status of the system through menu
operation.
6. Real time display of measured Temp & Hum curves.
7. It accurately displays the running time of critical components through menu operation.
8. The expert-level fault diagnosis system can automatically display the current fault information to facilitate
maintenance personnel in servicing and repair.
9. It can store up to 1000 historical alarm records.
6.2. Appearance
The unit has a 7-inch HMI color display and its appearance is shown in Figure 6-1
Vertiv | Liebert® CRV4 | User Manual
51
Micro-Controller (Color Screen)
Figure 6-1 Color Screen
The Liebert® CRV4 series display indicator lamp has four colors; corresponding colors and their functions are
described in Table 6-1.
Table 6-1 Function Description
Indicator Color
Description
Blue
Starting display
Yellow
Display system shutdown or failure in the control panel communications.
Green
System operating normally
Red
Alarm in system and buzzer
6.3. Control Screen
6.3.1. Main Screen
After the startup is completed, enter the main interface. The top part of the color screen displays the menu
button, first page button, time and date, and unlock button. User cannot enter the menus as the menu button
is not unlocked. Click the unlock button and enter correct password, the top part of the screen will display
temperature / humidity setting button, curve button and On/Off button as shown in Figure 6-2; user can switch
the On/Off functions by pressing the On/Off button for at least 3seconds.
As shown in the left half part of Figure 6-2, the text on the left of the control mode displays the humidity control
mode (air supply humidity control); the text on the right displays the temperature control mode (default air
supply control mode, and is consistent with the compressor control mode); and the temperature value in the
circle shows actually measured temperature / humidity values (default is air supply temperature) in current
mode; the humidity value means the air supply humidity. For the two triangles on the edge of perimeter, the left
Vertiv | Liebert® CRV4 | User Manual
52
Micro-Controller (Color Screen)
one means the air supply humidity setpoint and the right one means the temperature setpoint in current mode.
Clicking toggle button 1 can switch the display between the graphic display and table display. Click the setting
button can enter the temperature / humidity setting interface to set the temperature / humidity.
As shown in the right half of Figure 6-2, the sensor data or alarm data is displayed. Click the toggle button 2 to
switch between the sensor data and the alarm data.
No.
Description
No.
Description
1
Menu button
8
Unlock button
2
Operating status
9
On/ Off button
3
Toggle button 1
10
Time display
4
Control mode
11
Graph button
5
Status display
12
Setting button
6
Real-time data
13
User button
7
Toggle button 2
Figure 6-2 Color Display Screen - Unlock
Vertiv | Liebert® CRV4 | User Manual
53
Micro-Controller (Color Screen)
Table 6-2 provides the list of menu keys and its functional description:
Table 6-2 Color Screen Button Functional Description
Touch Keys
Functional Description
Menu button
Press this button to display the main menu page by page and enter the various sub-menus.
User button
Press this button to enter the main page to see the systems primary data readings.
Setting button
Press this button to enter the temperature and humidity settings page, which can set the system
temperature and humidity, and the control mode.
Graph button
Click this button to enter the curve interface, user can view the average return air temperature,
the remote average temperature, the average air supply temperature, and the average air supply
humidity of 0 to 48Hour.
Time display
Displays the current time.
ON/OFF button
Unit is Off, press the button at least 3seconds, the unit will boot;
the unit is running, press the button at least 3seconds, the unit will shut down.
Unlock button
Press the unlock button, enter the correct user login password to access; the menu icon appears
after log-on to set parameters; click the unlock button to enter the unlocked interface.
Operating status
Displays the current operating status of the unit (shutdown, operation, standby, lock,
communication interruption).
Toggle button 1
Press the toggle button to switch between the graphical display mode and the list display mode.
Toggle button 2
Press this button to switch between the current sensor readings and alarm pages.
Control mode
Display the current setting value of the unit and the environment conditions of the equipment
room, as described in the following main interface control mode.
Status display
Displays the current state of the unit.
Sensor reading list
Displays the current operating status of each sensor and its respective components.
Alarm list
Displays all the current alarms.
Vertiv | Liebert® CRV4 | User Manual
54
Micro-Controller (Color Screen)
6.3.2. Main Interface Control Mode
The main interface is divided into temperature control mode, humidity control mode, temperature value
in current control mode, theoretical supply air humidity value, and three read-only status of temperature /
humidity setting value.
Figure 6-3 Control Mode Diagram
Table 6-3 Description of Control Mode Diagram
No.
Description
1
The colors in the circle are red, gray and green (depending on the status of the unit).
2
The measured supply air temperature value changes with the change of the compressor’s current control
mode.
3
The humidity setting value changes and rotates clockwise between 30° - 150° polar coordinate angles
according to the range of humidity setting value. When the humidity setting is at minimum value, the
value is 30° in the polar coordinate; when the humidity setting value is at maximum value, and the
humidity setting value is 150° in the polar coordinate.
4
Humidity control is the air supply humidity control by default, showing “supply”.
5
The temperature setting value changes and rotates clockwise between 30° - 150° polar coordinate angles
according to the range of temperature setting value. When the temperature setting is at minimum value,
the value is 30° degrees in the polar coordinate; when the temperature setting value is at maximum value,
and the temperature setting value is 150° degrees in the polar coordinate.
6
Theoretical air supply humidity value.
7
The current control mode of compressor is air supply humidity control by default, showing “supply”.
8
means humidity.
9
means temperature.
Vertiv | Liebert® CRV4 | User Manual
55
Micro-Controller (Color Screen)
There are three types of main interface unit status colors, as shown in Figure 6-4 below:
Figure 6-4 Unit Status Color
Table 6-4 Unit Status Color Description
Status
System Status Description
Red
Power-On, sensor data is not in the normal range or is invalid
Gray
Off state
Green
Power-On, status is within the normal range
6.3.3. Password Interface
Press on the unlock icon in the upper right corner of the display, the password interface is displayed, as shown
in Figure 6-5.
Figure 6-5 Password Interface
Vertiv | Liebert® CRV4 | User Manual
56
Micro-Controller (Color Screen)
The three levels of passwords for accessing the menu are given in Table 6-5.
Table 6-5 Password Level
Password
level
User
Initial
password
Remark
Level 1
General
operator
1490
Browse all menu information.
Set temperature setpoint, humidity setpoint ; time setting and
display language.
Level 2
Maintenance
personnel
-
Browse all menu information. Set all parameters except display
address
Level 3
Factory
technician
-
-
User cannot change the setting when entering an incorrect password. However, they can view the menu. To go
back to the Main screen, press the Esc button and then click on the Enter button to get access to the Password
interface again.
If the user do not enter a password and press the Enter button, the user can view the menu settings but
cannot change any parameters, similar to the incorrect password example.
6.4. Menu Structure
6.4.1. Main Menu
The Main Menu screen is accessible by entering an confirming the correct password credentials, as shown in
Figure 6-6. For more information on Main Menus, refer to the Appendix 2 Display Menu Structure Diagram.
Figure 6-6 Main Menu
Vertiv | Liebert® CRV4 | User Manual
57
Micro-Controller (Color Screen)
The menu structure is described in Table 6-6.
Table 6-6 Main Menu Description
Menu Item
Descriptions
Run Information
View temperature/ humidity information, Switch status, power information,
Teamwork information
Alarm Information
View system active alarms history alarms and hp abnormal record
Temp & Hum setting
Set the temperature/ humidity value
Param Setting
Set alarm setpoint, alarm attribute, communication settings, teamwork settings,
time settings, display settings and password setting
Graph
View return air temperature curve, return air humidity curve, supply air
temperature curve, and remote temperature curve
About
View the controller software and hardware version number, and the software and
hardware version number of the LCD
Menu
Homepage
Display operating status, operating data, alarm data, sensor data
Setting
Temperature/ humidity setting under the same menu
Curve
Temperature/ humidity curve under the same menu
6.4.2. Run Information
In the main menu, select Run Information to enter the interface as shown in Figure 6-7, including temperature
and humidity information, switch status, power information, and teamwork information.
• Temp/Hum information
The Temperature/ Humidity menu displays the temperature/ humidity parameters of the device in real time,
including return air temperature/ humidity, supply air temperature, remote temperature and other information,
as shown in Figure 6-7 of temperature/ humidity information. Press the scroll bar to the extreme right to
navigate information to the far right.
Vertiv | Liebert® CRV4 | User Manual
58
Micro-Controller (Color Screen)
Figure 6-7 Temperature Humidity Information
• Switch status
The Switch status menu displays the switch status of each electrical component, as shown in Figure 6-8.
Figure 6-8 Switch Status Information
Vertiv | Liebert® CRV4 | User Manual
59
Micro-Controller (Color Screen)
• Power Information
The Power Information menu displays the three-phase voltage and frequency, as shown in Figure 6-9.
Figure 6-9 Power Information
• Teamwork Information
The Teamwork Information menu displays the status of the group information, as shown in Figure 6-10.
Figure 6-10 Teamwork Information
Vertiv | Liebert® CRV4 | User Manual
60
Micro-Controller (Color Screen)
6.5. Alarm Information
Press the Alarm Information icon in the main menu to enter the page as shown in Figure 6-11. It contains two
pages: alarm status and alarm history.
• Alarm Status
The Alarm Status page is used to monitor the current alarm status record of the AC unit, indicating no alarm or
specific alarm status information. Specific alarm status information includes serial number, alarm content, alarm
time, as shown in Figure 6-11.
Figure 6-11 Alarm Status
•
The latest Alarm SN is the least number. Press the Up or Down button to scroll through the status records
if more than one alarm is activated.
•
They will be cleared upon system Power-Off.
Vertiv | Liebert® CRV4 | User Manual
61
Micro-Controller (Color Screen)
• Alarm History
The Alarm History is used to view the historical alarm records, including the Alarm Status Number (quantifiable
number of history alarms), Alarm Serial Number, Alarm Type, and Alarm Time (Start and End Time) as shown in
Figure 6-12.
Figure 6-12 Alarm History
•
Press the Up or Down button to scroll through the status records if more than one alarm is activated.
•
Up to 1000 historical alarm records can be stored. They will not be cleared upon system Power-Off.
6.5.1. Temperature and Humidity
Select the Temperature Humidity setting in the main menu to enter the interface as shown in Figure 6-13
including temperature settings and humidity settings.
• Temp Setting
The Temp Setting menu interface is shown in Figure 6-13. The user can set the supply air temperature, return
air temperature, remote air temperature, and temperature difference under this menu.
Vertiv | Liebert® CRV4 | User Manual
62
Micro-Controller (Color Screen)
Figure 6-13 Temp Setting
• Hum Setting
The Hum Setting menu interface is shown in Figure 6-14. The user can set the humidity setting value under
this menu.
Figure 6-14 Hum Setting
Vertiv | Liebert® CRV4 | User Manual
63
Micro-Controller (Color Screen)
6.5.2. Parameter Setting
Select Parameter Setting from the main menu to enter the interface as shown in Figure 6-15, including alarm
setpoint, alarm attribute, communication setting , teamwork setting, time setting, display setting and password
setting.
• Alarm Setpoint
The Alarm Setpoint menu interface is shown in Figure 6-15.
Figure 6-15 Alarm Setpoint
• Alarms Attribute
The Alarms Attribute menu interface is shown in Figure 6-16.
Vertiv | Liebert® CRV4 | User Manual
64
Micro-Controller (Color Screen)
Figure 6-16 Alarms Attribute
Do not change the default values of the initial settings. It is recommended to change the settings only under
the guidance of qualified service professional.
• Communication Setting
The Communication setting menu interface is shown in Figure 6-17, communication setting screen, the system
parameters can be set to monitoring protocol, monitor baudrate and monitor address.
Figure 6-17 Communication Setting
Vertiv | Liebert® CRV4 | User Manual
65
Micro-Controller (Color Screen)
• Teamwork Setting
The Teamwork Setting menu interface is shown in Figure 6-18.
Figure 6-18 Teamwork Setting
• Time Setting
The Time Setting menu interface is shown in Figure 6-19.
Figure 6-19 Time Setting
Vertiv | Liebert® CRV4 | User Manual
66
Micro-Controller (Color Screen)
• Display Setting
The Display Setting menu interface is shown in Figure 6-20.
Figure 6-20 Display Setting
• Password Setting
The Password Setting menu interface is shown in Figure 6-21.
Figure 6-21 Password Setting
Vertiv | Liebert® CRV4 | User Manual
67
Micro-Controller (Color Screen)
6.5.3. Graph
Select Graph in the main menu to enter the interface as shown in Figure 6-22. Under this menu, the user can
query the curve of return temperature, return humidity, supply temperature, and remote temperature of
0 to 48 Hours.
Figure 6-22 Graph
6.5.4. About
The About menu is used to query the software model and version number, as shown in Figure 6-23.
Figure 6-23 About
Vertiv | Liebert® CRV4 | User Manual
68
Micro-Controller (Text-screen)
Chapter 7: Micro-Controller (Text-screen)
This chapter provides a detailed description on feature, appearance, color screen, control buttons, control
interface and menu structure of the Liebert® CRV4 precision air conditioner. It also helps the user gain insight
of the inner workings of the product which include the information such as system setup, alarm menus and
basic maintenance.
7.1. Features
Following are the features of the micro-controller:
1. The micro-controller is used for monitoring and displaying the operation status of the Liebert CRV4 unit to
keep the environment within a setting range.
2. It comprises a 128x64 dot matrix LCD screen with white backlight and an easy-to-use interface.
3. It provides a three-level password protection to effectively prevent unauthorized operation.
4. It provides the functions, including self-recovery upon power failure, high and low voltage protection, phase
loss and protection against phase-reversal.
5. It accurately displays the running time of critical components through menu operation.
6. The expert-level fault diagnosis system can automatically display the current fault information to facilitate
technician personnel in maintenance activities.
7. It can store up to 1000 historical alarm records.
8. Configure the RS485 interface, using MODBUS-RTU communication protocol.
7.2. Appearance
The micro-processing controller panel is shown in Figure 7-1.
Vertiv | Liebert® CRV4 | User Manual
69
Micro-Controller (Text-screen)
No.
Description
No.
Description
1
LCD screen
5
Down button
2
Run indicator
6
ENT button
3
Alarm indicator
7
Up botton
4
ESC button
8
On/Off button
Figure 7-1 Appearance of the Micro Controller
7.3. Graphic Color Screen
The LCD screen default language setting is English, white backlight. It displays the current air supply
temperature in the first queue, humidity in the second queue, and air return temperature in the third queue.
When the compressor mode or fan mode is set to Remote, the queue displays the remote temperature.
In the lower part of the screen, it displays the unit output status (fan, cooling, heating, dehumidifying, and
humidifying) and unit operation status (off, running, standby, and locked). The icons on the main screen indicate
the unit output status, unit properties, and unit operating status. Refer Figure 7-2 for better understanding.
Figure 7-2 Main Screen
More detailed information such as the operating status of a component and temperature/humidity can be
obtained from the main menu. When browsing the menu, the current menu item is highlighted; when the setting
is modified, the current modification bit is highlighted.
Vertiv | Liebert® CRV4 | User Manual
70
Micro-Controller (Text-screen)
7.4. Control Buttons
7.4.1. Function Description
The micro-controller provides five control buttons as shown in Figure 7-3.
No.
Description
No.
Description
1
On/Off button
4
Down button
2
Enter button
5
Up bottom
3
ESC button
Figure 7-3 Control Buttons Description
Table 7-1 describes the detailed functions of the control buttons.
Table 7-1 Function Description of Control Buttons
Button
Function description
On/ Off
Switch On/ Off the controller by pressing for 3seconds.
Enter button
Enter the selected menu screen. Validate the parameter setting value.
Escape button
Exit the current menu and return to the normal screen or previous menu screen.
Abort parameter change; silence the audible alarm.
Up button
Move the cursor up or increase the parameter value. For a toggle selection: scroll
through the options. For a multi-screen menu: scroll up the screen.
Down button
Move the cursor down or decrease the parameter value. For a toggle selection: scroll
through the options. For a multi-screen menu: scroll down the screen.
Vertiv | Liebert® CRV4 | User Manual
71
Micro-Controller (Text-screen)
7.4.2. Operational Examples
Example 1: Enter the password to access the Main Menu
After the unit is powered On, user can enter the Main Menu by following the step-by-step instructions on the
Normal screen.
1. Press the Enter button to enter the Password screen.
2. Next, press the Enter button again to highlight the input data field in the Password screen.
3. Press the Up and Down button to change the current password number.
4. Press the Enter button to confirm the password following which the Main Menu screen is populated on the
controller screen.
Example 2: Parameter setting
To set the high temperature alarm of the airflow in the Hi Sup Temp in Alarm Stpt menu, perform the following
steps:
1. Press the Up and Down button to move the cursor to the Alarm menu option in the Main Menu section.
2. To enter the Alarm Menu, press the Enter button.
3. Press the Up and Down button to move the cursor to the Alarm Set option on the Alarm Menu screen.
4. Press the Enter button to access the Alarm Set screen.
5. Press the Up and Down button to move the cursor to the Alarm Stpt in the Alarm Set Screen.
6. Press the Enter button to enter the Alarm Stpt screen.
7. Press the Enter button to highlight the parameter field of Hi Sup Temp.
8. In order to select the parameter option, scroll using the UP and Down buttons. Select/change the specific
Parameter.
9. Press the Enter button to confirm it following which the changes will take effect.
10. Press the Esc button to return to the previous menu screen.
If user do not press the Enter button to validate the changed parameter after the changing the parameter, the
change of Hi Sup Temp is invalid.
Vertiv | Liebert® CRV4 | User Manual
72
Micro-Controller (Text-screen)
7.5. Control Screen
7.5.1. Startup Screen
After the system is powered On, the LCD will display the Startup screen as shown in Figure 7-4.
Figure 7-4 Startup Screen
7.5.2. Main Screen
After the unit is powered On, the main page screen is displayed after 10 seconds of the startup as shown in
Figure 7-5. It displays the current air supply temperature in the first queue, humidity in the second queue, and
air return temperature in the third queue. When the compressor mode or fan mode is set to Remote, the queue
displays the remote temperature. In the lower part of the screen, it displays the unit output status (fan, cooling,
heating, dehumidifying, and humidifying) and unit operation status (off, running, standby, and locked).
• Icons
The icons on the main screen indicate the unit output status, unit properties, and unit operating status. The
icons and their definitions are described in Table 7-2.
Figure 7-5 Main Screen
Vertiv | Liebert® CRV4 | User Manual
73
Micro-Controller (Text-screen)
Table 7-2 Icons Definition
Icons
Definitions
Fan rotating speed. Displaying the percentage of actual fan rotating speed.
Compressor capacity. Displaying the percentage of actual compressor capacity.
Heating state. Displaying 100% in heating mode, otherwise, displaying 0%.
Humidifying state. Displaying 100% in humidifying mode, otherwise, displaying 0%.
Dehumidifying state. Displaying 100% in dehumidifying mode, otherwise, displaying 0%
Unit properties/ operation status- S: single; T: teamwork; ON: running; R-OFF: remote shutdown; L-OFF:
local shutdown; M-OFF: monitoring shutdown; MANU: manual mode; BKUP: backup; Lock: lock
When using RDU-A for teamwork control, the unit attribute will always display “single unit”, and the “standby”
status of the running will not be displayed.
7.5.3. Password Interface
Press the Enter button on the Main screen and the Password screen will appear as shown in Figure 7-6.
Figure 7-6 Password Interface Screen
Three levels of passwords are provided for accessing the menus. The detailed descriptions are listed in
Table 7-3.
Vertiv | Liebert® CRV4 | User Manual
74
Micro-Controller (Text-screen)
Table 7-3 Password Level
Password
Level
User
Initial
Password
Remark
Level 1
General
operator
1490
Browse all menu information. Only set temperature and
humidity Setpoints. Cannot change any values and settings
Level 2
Maintenance
personnel
-
Browse all menu information. Set all parameters
Level 3
Factory
technician
-
-
For detailed operation on entering the password, refer to Section 7.4.2 Operation Example. If incorrect password
is entered in the controller, the menu options can only be viewed, but the parameter settings can not be
changed. In this case, to return to the Main screen, User can press the ESC button and then press the Enter
button to re-enter the Password interface again.
7.6. Menu Structure
7.6.1. Main Menu
By entering the correct credentials for the password and confirming it, the Main Menu screen will be accessible.
For more information, refer to the Appendix 2 Display Menu Structure Diagram which defines the menu
structure of the Micro-processing controller. On selecting a menu item, that item will be highlighted. Figure 7-7
shows the Main Menu screens:
Figure 7-7 Main Menu Screens
The users can change most of the parameters setting; however, there are some parameters that cannot be
modified or altered.
Vertiv | Liebert® CRV4 | User Manual
75
Micro-Controller (Text-screen)
Table 7-4 describes the different menu items on the Main Menu screen:
Table 7-4 Main Menu Description
Menu Item
Descriptions
Run Info
View temperature / humidity information, airflow pressure information, power information,
Teamwork information
Alarm Info
View system active alarms and history alarms
TEMP &
Hum Set
Set the temperature / humidity value
Para Set
Set system settings, alarm settings, humidifier settings, airflow pressure settings, display
settings, password settings, and teamwork control settings
Help
View the controller software and hardware version number, and the software and hardware
version number of the LCD
7.6.2. Run Information
In the Main menu, select Run Info to enter the interface as shown in Figure 7-8, including temperature &
humidity information, ESP information, power information, and teamwork information.
Figure 7-8 Run Information Screen
• Temperature & Humidity Information
In the run information menu, select TEMP / Hum Info to enter the interface as shown in Figure 7-9. Press the
up or down button to scroll up or down to display the options in the menu.
Vertiv | Liebert® CRV4 | User Manual
76
Micro-Controller (Text-screen)
Figure 7-9 Temperature/ Humidity Information Screens
• ESP Information
In the run information menu, select ESP Info to enter the interface as shown in Figure 7-10.
Figure 7-10 ESP Information Screen
Vertiv | Liebert® CRV4 | User Manual
77
Micro-Controller (Text-screen)
• Power Information
Select the Power Info in the run information menu to enter the interface as shown in Figure 7-11.
Figure 7-11 Power Information Screen
• Teamwork information
In the run information menu, select Teamwork Info to enter the interface as shown in Figure 7-12.
Figure 7-12 Teamwork Information Screen
7.6.3. Alarm Information
In the main menu interface, select Alarm Info to enter the interface as shown in Figure 7-13, user can view the
active alarm and history alarm information.
Vertiv | Liebert® CRV4 | User Manual
78
Micro-Controller (Text-screen)
Figure 7-13 Alarm Information Status Screen
• Alarm Status
The Alarm Status menu is used to monitor the active alarm status records of the unit, indicating no alarm or
specific alarm status information. The specific alarm status information includes XX/YY, alarm type, and alarm
occurrence time, as shown in Figure 7-14. Among them, XX is the alarm number, which means that the active
alarm status record is displayed; YY refers to the total number of alarm status records that currently occurs.
Figure 7-14 Alarm Status Screen
•
The last alarm number is the smallest number. When multiple alarms occur, press the up or down button
to scroll the query up or down continuously.
•
The active alarm record is automatically cleared when the system is powered Off.
• Alarm History
The Alarm History menu is used to query the historical alarm information of the unit, including XX/YY, alarm
type, alarm occurrence time, and alarm end time, as shown in Figure 7-15. Among them, XX is the current history
alarm number; YY refers to the total number of history alarm records that currently occurs.
Vertiv | Liebert® CRV4 | User Manual
79
Micro-Controller (Text-screen)
Figure 7-15 Alarm History Screen
•
When multiple alarms occur, press the up or down button to scroll up or down the query.
•
Up to 1000 history alarm records can be saved.
7.6.4. Temperature & Humidity Settings
Select the TEMP & Hum Set on the main menu interface to enter the interface as shown in Figure 7-16. It
can be used to set the supply air temperature, remote temperature, return air temperature, difference in
temperature and humidity.
Figure 7-16 Temperature & Humidity Set Screens
7.6.5. Parameter Settings
Select Para Set in the main menu to enter the interface as shown in Figure 7-17. The parameters in the system
settings are permanently saved.
Vertiv | Liebert® CRV4 | User Manual
80
Micro-Controller (Text-screen)
Figure 7-17 Parameter Set Screens
• System Set
The System Set menu interface screens are shown in Figure 7-18. The monitoring protocol, monitoring address,
baud rate, display address, and date and time settings can be changed in the system set menu.
Figure 7-18 System Set Interface Screens
7.6.6. Alarm Set
The Alarm Set menu interface screens are shown in Figure 7-19.
Figure 7-19 Alarm Set Screens
Vertiv | Liebert® CRV4 | User Manual
81
Micro-Controller (Text-screen)
It is not recommended to change the default value of the alarm parameter. If it is necessary, please operate
under the guidance of a trained professional.
7.6.7. Humidifier Set
The Humidifier Set menu interface is shown in Figure 7-20. In the humidifier setting, user can select electrode
humidifier, no humidifier according to the actual situation of the unit.
Figure 7-20 Humidifier Set Screen
7.6.8. Teamwork Set
The Teamwork Set menu interface is shown in Figure 7-21.
Figure 7-21 Teamwork Set Screens
7.6.9. ESP Set
The ESP Set menu interface is shown in Figure 7-22.
Vertiv | Liebert® CRV4 | User Manual
82
Micro-Controller (Text-screen)
Figure 7-22 ESP Set Screen
7.6.10. Display Set
The Display Set menu interface is shown in Figure 7-23.
Figure 7-23 Display Set Screen
7.6.11. Password Set
The Password Set menu interface is shown in Figure 7-24.
Figure 7-24 Password Screen
Vertiv | Liebert® CRV4 | User Manual
83
Micro-Controller (Text-screen)
7.6.12. Help
The Help menu is used to view the software version, as shown in Figure 7-25.
Figure 7-25 Help Screen
Vertiv | Liebert® CRV4 | User Manual
84
System Operation and Maintenance
Chapter 8: System Operation and Maintenance
This chapter describes the system operation and maintenance of the Liebert® CRV4 range of air conditioners
briefly in accordance to the end-user perspective. It includes information related to routine maintenance and
inspection, electrical parts, connections, refrigerant system maintenance guidelines, cabling, system diagnosis,
visual appearance checks, and drainage maintenance among others; that help in system fault diagnosis and
treatment.
For the diagnosis and treatment of complex fault please contact Vertiv representative.
Prior to operation and maintenance, the lethal voltage may be present in the unit which can be fatal. All
notes, warnings, and cautions marked on the unit as well as the ones mentioned in the manual must be
considered, otherwise, it may lead to injury and fatality.
Qualified and professional maintenance personnel are the one supposed to operate and handle the unit.
8.1. Routine Maintenance & Inspection Items (Monthly)
Following is a checklist which contains parts and components that are to be checked to ensure proper and
accurate functionality. In addition to that, there may be wear and tear of the unit. Therefore, it is essential that
all the checks are performed to ensure a smooth flow in operations. Table 8-1 details the list of inspection
activities and actions that need to be implemented and carried out every month during maintenance of the
various components in the Liebert CRV4 series of air conditioners.
Table 8-1 Routine Maintenance & Inspection Checklist (Monthly)
Components
Item
Remark
Check for clogging or damage
Filter
Check the filter clogging switch
Clean the filter
Fan
Compressor
The fan blades are not distorted
The bearings are not worn out
Check for leakage
Listen to the operation sound, observe the operation vibration
Ensure that the condenser coil is clear from dirt and debris. Clean if required.
The fan base should be firm
Air cooled
condenser
The fan vibration absorber is not deteriorated or damaged.
The SPD board should be effective (in the seasons when there are storms, the
SPD board should be checked once a week).
The refrigerant piping are properly supported
Vertiv | Liebert® CRV4 | User Manual
85
System Operation and Maintenance
Components
Item
Remark
Check the suction pressure
Check the discharge pressure
Refrigeration
system
Check the refrigerant piping for signs of leaks
Check the moisture condition in the system through the sight glass
Check the electronic expansion valve
Heating system
Check the re-heater operation
Check the erosion on the components
8.2. Routine Maintenance and Inspection (Semi-annually)
Following is a checklist (refer Table 8-2) of the items that need to be checked semi-annually to ensure a smooth
operational flow, and check the functionality as well as the wear-and-tear of the components in the
Liebert® CRV4 range of air conditioners.
Table 8-2 Routine Maintenance and Inspection Checklist (Semi-annually)
Components
Item
Remark
Check for clogging or damage
Air Filter
Check the filter clogging switch
Clean the filter
The fan blades are not distorted
Fan
The bearings are not worn out
Check and fasten the circuit connections
Check for leakage
Compressor
Listen to the operation sound, observe the operation vibration
Check and fasten the circuit connections
Check the fins cleanness
The fan base should be firm
The fan vibration absorber is not deteriorated or damaged
Air-cooled
condenser (if used)
The SPD board should be effective (in the seasons, when the storms are
common, the SPD board should be checked once a week)
Check the voltage regulating function of the rotation speed controller
The temperature switch is set at the required position
The refrigerant piping are properly supported
Check and fasten the circuit connections
Check the suction pressure
Vertiv | Liebert® CRV4 | User Manual
86
System Operation and Maintenance
Refrigeration
system
Check the discharge pressure
Check the refrigerant piping
Check the moisture condition in the system through the sight glass
Check the re-heater operation
Heating system
Check the erosion situation of the components
Check and fasten the circuit connection
Check the fuse and the MCB
Electrical control
part
Check and fasten the circuit connections
Check the control program
Check the contactor action
8.3. Self-Diagnosing Functions
The micro controller has a built-in diagnostic function that helps to turn On/Off the components and check
their functionality.
8.4. Maintenance of Electrical Control Utilities
In this section, the following processes will be discussed in brief, namely1. Maintenance of Electrical Parts
2. Maintenance of Control System
3. Water Leak Detector
8.4.1. Maintenance of Electrical Parts
Visual checks and handling need to be carried out to check the correctness of electrical connections for the
following items:
1. Conduct the electrical insulation test on the system to find out bad electrical connections and contacts.
Disconnect all the fuses and MCBs of the control part during the test as high voltage from the insulation test
could damage the components.
2. Check the contactors prior to powering On the unit to ensure that the contactors can hold and un-hold
freely.
3. Clean the electrical and control components off dust with brush or dry compressed air.
4. Check the closing of contactors for arcs or signs of burning. Replace the contactors, if required.
5. Fasten all the electrical connection terminals.
6. Check that the sockets and plugs are in good conditions. Replace the contactors, if required.
7. If the power cables are damaged, get them replaced by a qualified/ certified electrician.
Vertiv | Liebert® CRV4 | User Manual
87
System Operation and Maintenance
8.4.2. Maintenance of Control System
Appearance checks and simple functional tests coupled with handling of control parts need to be carried out
on the following items:
1. Carry out visual checks on the power transformers and isolation transformers for any burn marks followed by
testing the output voltage (of the indoor unit and outdoor condensers).
2. Check for signs of aging on the control interface board, control board, temperature and humidity sensor
boards, and fuse boards.
3. Clean the electrical control components and control board to remove dust. Debris, dust, and dirt must be
removed, preferably by a dust removing agent.
4. Check and fasten the Input/ Output ports on the control interface board. It should also include the
connections between the control board and control interface boards as well as the connections between the
Temperature/Humidity sensor boards and the control interface board.
5. Check the connection between the user terminals (70#, 71#, 37#, and 38#) and the control interface board.
6. Check the output connections between the control interface board and various components including
contactors and solenoid valves for liquid pipes. Inspect the input connection between the control interface
board and various components, including high pressure switches, heating over-temperature protection
switches, discharging temperature and high pressure sensors. Specifically, check the inserting terminals
such as high pressure switches and heating over temperature switch followed by replacing the component if
it is loosened or in poor condition.
7. Replace the faulty electrical components such as faulty control fuses (or MCB’s) and control boards.
8. Check the trunking or insulation condition of the control and power cable connected to the outdoor unit
from the indoor unit. Replace the cable, if required.
9. Use a temperature/ humidity measuring meter with high precision to calibrate temperature/ humidity sensor.
10. Regulate the setting point. Meanwhile, check the action of the various function components according to the
control logic.
11. Simulate and inspect the operation-and-working states of protecting units such as high/ low pressure alarm,
high/ low temperature alarm, high water level alarm, and over-temperature alarm and over-temperature
protection.
12. Check the sensors.
8.4.3. Water-Leak-Detector
When the unit is installed on the raised floor, the water leak detector are arranged on the ground under the
floor; when the unit is installed on the floor, the leakage water detector are arrange on the floor. Confirm the
alarm information through the controller. The detector should be located away from any water pool or drainage
discharge on the floor, 2 m to 2.5 m away from the unit. Do not place it directly under the machine. Figure 8-1
shows the recommended location for the water-leak-detector:
Vertiv | Liebert® CRV4 | User Manual
88
System Operation and Maintenance
No.
Description
No.
Description
1
Location of water leak detector
3
Drain pipes on the ground
2
Location of water leak detector
Figure 8-1 Recommended Location for the Water-Leak-Detector
•
Ensure that the power supply of the control unit has been disconnected before connecting any
mechanical parts or cables.
•
Do not use the water-leak-detector in the vicinity of flammable liquids; do not use it to detect any
flammable liquids.
Vertiv | Liebert® CRV4 | User Manual
89
System Operation and Maintenance
8.5. Air Filter Maintenance
The efficiency of the configured filter is 30%, in compliance with industry standards such as the America
MERV8, ASHRAE52-76 and Eurovent 4/5 standards; the dust resistance value is 90% (EU4 standard).
1. Set the filter maintenance and alarm logic to ensure efficient operation. The fan operating time is 2160hours
by default (though the time is set and customized based on the local operating environment); the filter
maintenance alarm is triggered based on the configuration and settable operation time.
2. Check and replace the filter according to its dust and clogging condition. During normal operations, the filter
needs to be checked once a month and replaced as per the requirement.
Cut off the power before replacing the filter. Clear the fan operating time after replacing the filter.
8.6. Fan Kit Maintenance
Regular checking of the EC fans includes inspection of the motor operating status, fan impeller state, and the
co-operative clearance between the fan and airflow-leading ring.
Check whether the fan or the airflow-leading ring has been installed properly and firmly. Ensure that the fan
blades do not hit the adjacent metal plates under any circumstances. Clear the clogging element of the air duct
to avoid damage to the refrigerating system and other system kit due to reduced air volume.
The fan of the Liebert® CRV4 unit needs 48 Vac main power supply, and the speed is adjusted by the
0 V to 10 V DC analog signal output from the control board. When the fan is abnormal or does not rotate,
please check the analog signal and the main power supply.
Following are the steps to replace the fan:
1. For safety reasons, cut off the power supply of the unit and open the front door of the unit.
2. Remove the four bolts of the fixed fan mounting plate and take out the fan mounting components.
3. Remove the four bolts and grounding bolts of the fixed fan and remove them from the mounting plate.
4. Remove other fans in the same way.
5. The above steps can be reversed to install the replaced fan. During installation, pay attention to the
corresponding hot plug terminals and firm contact in the installation process.
Figure 8-2 shows the illustration of the replacement procedure for better understanding.
Vertiv | Liebert® CRV4 | User Manual
90
System Operation and Maintenance
Figure 8-2 Removal of the Fan Assembly
•
Turn Off the fan/ unit prior to replacement of the filter.
•
The speed regulating control board of the outdoor EC fan has a possibility of an electric shock leading to
injury. Therefore, do not touch the board when the unit is powered On.
•
While the unit is powered On, do not strictly touch the fan mesh enclosure as it may end up damaging
caused by the fan operation.
Vertiv | Liebert® CRV4 | User Manual
91
System Operation and Maintenance
8.7. General Maintenance for the Electrode Humidifier
If the unit is equipped with electrodes for humidification, it should be regularly maintained.
8.7.1. Operating Guidelines for the Electrode Humidifier
The electrode humidifier kit consists of a bracket (including water pressure components such as inlet, outlet
solenoid valves), humidifier canister, humidification control board CPY (located in a metal box close to the
humidifier), power frequency transformer, high frequency current transformer, contactor, relay, water-in pipe,
drain pipe, relay socket and steam pipe as shown in Figure 8-3.
No.
Description
No.
Description
1
Drain Pipe
5
Humidifier canister
2
Water in pipe
6
Steam pipe
3
Outlet solenoid valve
7
Bracket
4
Inlet solenoid valve
Figure 8-3 Electrode Humidifier
The micro-controller calculates if humidification is required based on the humidity and temperature values
from the temperature/humidity sensor. If a call for humidification is registered, the micro-controller will send
a humidification signal to the humidification control board and provide 24 V power supply to it. Then the
humidification control board will start the humidification process. The Humidification control board adopts
On/ Off operation mode, and controls the humidification operation based on the programmed procedure. The
humidification control board is located in a metal box close to the humidifier and its interfaces are shown in
Figure 8-4.
Vertiv | Liebert® CRV4 | User Manual
92
System Operation and Maintenance
Figure 8-4 Interface of Humidification Control Board
8.7.2. Replacing Humidifier
Due to the sediments in the water drained from the humidifier, the humidifier tray must be cleaned periodically
to avoid clogging of the tray and the drainage pipe. The cleaning cycle varies with the water quality, as well
as the humidification operation time. Timely cleaning of the humidifier tray must be done every month, as a
consumable, the humidifier doesn’t require regular cleaning. If the water keeps entering the humidifier or the
input voltage of the humidification electrode is normal, but the water fails to boil, it means that the humidifier
has reached its service life and needs replacement.
Following are the procedures to replace the humidifier:
1. Turn Off the humidifier by setting the humidity setpoints on the controller lower than the actual humidity in
the equipment room.
2. Place the RUN/ DRAIN switch to the DRAIN position to forcefully empty the humidifier.
3. Turn Off the AC power.
Vertiv | Liebert® CRV4 | User Manual
93
System Operation and Maintenance
4. Remove the connection cables of the humidification electrode and high-water level probe from the canister.
5. Loosen the steam outlet hose clamps and remove the steam hose from the canister fitting.
6. Remove the canister from the humidifier bracket. Pay attention to protect the O-ring.
Canister and Steam hose may be very hot! Allow the humidifier to cool before replacement.
Reverse the previous steps to re-assemble the humidifier.
1. Protect the O-ring between the sealing canister bottom and the humidifier bracket.
2. Check and ensure that the steam outlet hose is connected without leakage.
3. Connect the power supply cable correctly. The cable fastening nut is tightened with the torque of
2 N.m to 3 N.m.
4. Restore the humidity setpoints to the original setting.
Figure 8-5 Humidifier Tray
Vertiv | Liebert® CRV4 | User Manual
94
System Operation and Maintenance
8.8. Electrical Heater Maintenance
Following are the basic instructions relevant to the maintenance of the Electrical Heater from the user
perspective:
1. If an optional electrical heater is used, then it should be monitored periodically.
2. Ensure that there is no dust, debris, or foreign matter on the surface. The heater elements will heat
continuously in the normal state.
3. Inspect the heater every six months for its functionality.
If the heating is not effective, the electrical heater needs to be replaced. For replacement, contact the
maintenance personnel and Vertiv representative for support details.
Following are the procedures to replace the electrical heater:
1. Cut Off the whole power supply and open the front door of the unit.
2. Remove the fan refer the procedure explained in Section 8.6 “ Fan Kit Maintenance”.
3. Remove the electrical heater fixing screw from the round hole of the fan mounting plate and take it out.
•
Check the rusting of electrical heater, remove rust with iron brush, or replace it according to the
situation.
•
When there is heating demand but no heating effect, please check whether the cable connected with the
thermostat in series is working with the multimeter to confirm whether the thermostat is normal.
Figure 8-6 shows the position of Thermostat and Fuse.
•
If the line is not connected, it is necessary to remove the electrical heater to further check whether the
fuse is disconnected, whether the thermostat is damaged and whether the PTC electrical heater is
damaged.
•
If user needs to change the electrical heater, contact the maintenance personnel and Vertiv
representative for support details.
No.
Description
No.
Description
1
Thermostat
2
Fuse
Figure 8-6 Electrical Heater
Vertiv | Liebert® CRV4 | User Manual
95
System Operation and Maintenance
8.9. Refrigerating System Maintenance
Following are the basic instructions relevant to the maintenance of the refrigerating system:
1. Check the refrigerating system once a month to ensure the system is functioning perfectly.
2. Perform a visual check for detecting signs of wear and tear.
3. Regular inspection is a good practice to ensure long service life of the refrigerating system.
4. Check the refrigerant piping once every 6 months to ensure that there is no wear and tear.
8.9.1. Suction Pressure
The compressor may stop when the suction pressure drops below the setpoint of the low pressure switch.
On the other hand, too high suction pressure will undermine the cooling effect of the refrigerant on the
compressor motor, leading to the damage of the compressor. The minimum (pressure switch action setpoint)
and the maximum (design operation value) suction pressures are listed in Table 8-3.
Table 8-3 Suction Pressure
System
Minimum Pressure, R410A
kPa
Maximum Pressure, R410A
kPa
CR025
4.5
12.4
CR035, CR045
4.5
13.4
8.9.2. Discharge Pressure
The discharge pressure may change with the load or the condenser efficiency. When the discharge pressure
increased to the setpoint of the pressure switch, the high pressure switch stops the compressor. See Table 8-4
for details.
Table 8-4 Discharge Pressure
System Design
kPa (PSIG)
CR025, CR035, CR045
3900
8.9.3. Electronic Expansion Valve (EEV)
The automatic regulation of the electronic expansion valve ensures that the evaporator is supplied with
sufficient refrigerant to meet the load conditions. By measuring the degree of superheat, it can verify whether
the operation of the electronic expansion valve is normal. If the amount of refrigerant supplied to the evaporator
is too small, the air suction superheat will be high; if too much amount of refrigerant is supplied to the
evaporator, the air suction superheat will be low.
Vertiv | Liebert® CRV4 | User Manual
96
System Operation and Maintenance
•
Air suction superheat has a big impact on the compressor life. If the compressor has operated for a long
period of time when the air suction superheat is small or zero, it may cause the compressor to “liquid
strike” and cause damage to the compressor.
•
The customer is not advised to adjust the Electronic Expansion Valve (EEV) on their own. If there is a
need to adjust, please contact Vertiv representative.
8.9.4. Air-cooled Condenser
When the outdoor unit airflow is blocked, clean the condenser with compressed air or a fin cleaning agent
(weakly alkaline) to remove dust and debris that hinder the airflow. When cleaning the fins with compressed air,
the direction of the purge should be reverse to the airflow direction. In winter, prevent snow from accumulating
around the condenser. Inspect the fins for rewinding or damage and perform simple repairs if necessary. Check
all refrigeration lines for vibration and reinforce, if necessary. Carefully inspect all refrigeration line accessories
for oil traces to determine the location of the leak.
8.9.5. Compressor
No direct contact between the refrigerant or lubricant and the skin when replacing the compressor, or
serious burning or frostbite may occur. Put on gloves with long sleeves when processing polluted parts.
Liebert® CRV4 air conditioner system uses the highly effective scroll compressor with high efficiency and high
reliability. It is rare for the motor of the compressor to get burned due to short circuit. If in the case, the motor
does get burned, the cause is usually mechanical problem or poor lubrication, in other words, due to overtemperature.
If the causes that lead to the compressor failure could be discovered and corrected in time, most failures are
avoidable. The maintenance personnel should check the operation situation periodically and take necessary
measures to ensure the system’s operation is normal. This practice is both easy and cost saving, when it is
compared with replacing the compressor upon faults that result from negligence or inadequate maintenance.
• Check electrical part
When diagnosing the compressor, check the operation situation of all the electrical parts of the compressor.
1. Check all the fuses and circuit breakers.
2. Check the operation of high pressure switch, high pressure sensor and low pressure sensor.
3. When the compressor is faulty, find out the nature of the cause: is it an electrical fault or a mechanical fault?
4. Check related historical information and historical operation records.
Vertiv | Liebert® CRV4 | User Manual
97
System Operation and Maintenance
• Mechanical faults
It is impossible to diagnose a mechanical fault of the compressor by smelling the burning. User should try
spinning the motor. If the fault is proved to be mechanical, the compressor has to be replaced. If the motor is
burned, user should remove the fault that leads to the burning of the motor and clean the system. It must be
pointed out that the compressor motor is usually burned because the system is not cleaned properly.
• Electrical faults
User can tell an electrical fault by the unpleasant smell. If serious burning occurred, the lubricant will appear
black and become acidic. When electrical fault occurs and the compressor motor is entirely burned, the system
must be cleaned to remove the acid material from the system and to avoid such faults in the future.
•
The compressor replacement needs to be guided or implemented by a professional. If you need to
replace it, contact Vertiv representative.
•
The damage to the compressor components due to improper cleaning is classified in the warranty
agreement as improper use of the product, thus is not covered by the warranty.
When the compressor is entirely burned, user needs to replace the filter dryer together with the compressor. In
addition, check the expansion valve. If the valve is faulty, replace it too. Before the replacement, user must clean
the system. If unsure about the cleaning method, please consult Vertiv representative for the support.
Following are the procedures to replace the compressor:
1. Cut off the whole power supply.
2. Standard steps are adopted to recover residual refrigerants in the system.
3. Remove the damaged compressor, remove the filter dryer, and clean the system according to the
instructions of the cleaning tools.
4. Install the replaceed compressor and filter dryer, the tightening torque of exhaust pipe thread joint is
130 N.m, the tightening torque of suction pipe thread joint is 150 N.m, and the torque required for connecting
moment of filter dryer threading is 45 N.m.
5. The pressure leak detection test of the system shows that the leak detection pressure is about 10 bar. If
there is no problem, the system is vacuum.
6. Refrigerant charging is carried out according to the charging requirement of evaporator, condenser and
refrigeration pipeline. For the refrigerant charging process refer “Section 5.2.2 Charging refrigerant”.
7. Turn On the power supply and run the air conditioning unit. Check whether the refrigeration operation is
normal. Refer to the normal refrigeration cycle suction and exhaust pressure range, when necessary, dynamic
supplement of a certain amount of refrigerant can be performed.
Vertiv | Liebert® CRV4 | User Manual
98
System Operation and Maintenance
•
For the residual refrigerants in the system, standard devices should be used to recover them before
maintenance.
•
Emission of refrigerants into the air can cause environmental pollution. Refrigerant emissions must
comply with national and local laws and regulations.
•
Attention should be paid to the direction when installing the filter dryer. Ensure that the arrow points to
the sight glass.
No.
Description
No.
Description
1
Rear
3
Compressor threaded joint
2
Filter Dryer
Figure 8-7 Replace the Compressor
8.10. Drainage System Maintenance
1. Inspect the water tray periodically for ensuring normal operation of the drainage pipe.
2. Ensure no sediments, debris, foreign matter, or leakage occurs in the water tray.
3. Check and clean the water tray filter regularly to prevent poor drainage caused by blockage.
Vertiv | Liebert® CRV4 | User Manual
99
System Operation and Maintenance
No.
Description
No.
Description
1
Rear
3
Water tray drain
2
Water tray drainage filter
4
Water tray drain filter
Figure 8-8 Water Tray Drainage Filter
Following are the procedures to replace the condensate pump:
1. Cut off the power supply of the unit.
2. Open the rear door, unscrew the hose clamp and pull out the water drain pipe.
3. Unscrew the hose clamp of the fixed water pump.
4. Reverse the above steps (1 to 3) and replace the pump, refer the Figure 8-9 for better understanding.
No.
Description
No.
Description
1
Location of water leak detector
3
Drain pipes on the ground
2
Location of water leak detector
Figure 8-9 Replace the Condensate Pump
Vertiv | Liebert® CRV4 | User Manual
100
Troubleshooting
Chapter 9: Troubleshooting
Troubleshooting is to be performed by the trained and qualified service personnel. However, the checklists have
been provided just for reference purposes.
•
Prior to operation and maintenance, the lethal voltage may be present in the equipment which can be
fatal. All notes, warnings, and cautions marked on the equipment as well as the ones mentioned in the
manual must be considered, otherwise, it may lead to injury and fatality.
•
Extreme care and caution is required while troubleshooting on-line.
•
Qualified and professional maintenance personnel are the one supposed to operate and handle the unit.
•
If jumpers are used for troubleshooting, remember to remove the jumpers after the troubleshooting
failing which the connected jumpers may bypass certain control functions and increase the risk to the
unit.
9.1. Troubleshooting of the Fan
The fan troubleshooting is described in Table 9-1.
Table 9-1 Troubleshooting of the Fan
Symptom
Possible Causes
Items to be Checked
Power supply
Disconnected
Check whether the fan MCB is closed; If the MCB is closed, check
if the power voltage of each phase is normal.
Control board
faulty
Check J15 on the micro-processing control board, to ascertain
whether the control board is faulty or functions correctly.
Fan power module
faulty
Check the alarm lamp on the fan power module to ascertain
whether it is faulty or functions correctly.
EC fan cannot
be started
Check L1, L2, and L3 of the fan against power failure, phase loss,
and low voltage.
EC fan faulty
Check whether the analog output is within the specific range of
0 Vdc to 10 Vdc as per the requirement.
Check whether the motor is clogged (due to large current).
Check whether the motor is too hot.
Check for Hall failure.
•
If the previous three problems (i.e. Motor Clogging, Hot Motor, or Hall failure) occurs, the motor can
restore normal operation after the faults are cleared.
•
If the motor is too hot, cut off the fan power supply; after the motor cools down, power On it again for
recovery.
•
In the event of a hall failure, factory service is required to fix the issue.
Vertiv | Liebert® CRV4 | User Manual
101
Troubleshooting
9.2. Troubleshooting of the Heating System
The heating system troubleshooting is explained in the Table 9-2.
Table 9-2 Troubleshooting of the Heating System
Symptom
Heating system
does not start,
the contactor
does not close
The contactor
closes, but
heating is
ineffective
Possible Causes
Items to be Checked or Handling Method
No heating
demand
Check the state of the micro-processing controller, and confirm if
there is a requirement for the heating command.
Safety device
of the heating
system is open
Use a multi-meter to measure the resistance on both ends of the
temperature controller; if the resistance is very large, it indicates that
the safety device may be open. Next, check whether the fuse is open
and the temperature controller is damaged. Measure the resistance of
the heater with an ohmmeter to determine if the heater is damaged.
Heater main
power is Off
Check if the heater’s MCB is turned ON; Check whether the L1, L2,
and L3 voltages are normal when the contactor is energized.
Electrical heater
burned
Turn Off the power supply; then physically check the condition of the
heater.
9.3. Troubleshooting of Compressor and Cooling System
The cooling system troubleshooting is explained in the Table 9-3.
Table 9-3 Troubleshooting of the Compressor and Cooling System
Symptom
Compressor
cannot be started
Possible Causes
Items to be Checked or Handling Method
Does not power On
(Shutdown)
Check the main power supply against under-voltage, over-voltage,
and phase loss.
MCB and contactor
faulty
Check the compressor MCB, contactor, and connecting cables.
Alarm lock
View the unit alarm records, replace the damaged component and
power it On again.
Compressor coils
shorted and burnt
Check the motor and replace it in case of any defects or
malfunction
Vertiv | Liebert® CRV4 | User Manual
102
Troubleshooting
Symptom
The contactor
does not get
closed, and the
compressor does
not start
Possible Causes
Items to be Checked or Handling Method
Low discharging
overheat degree
alarm
Check the state of the micro-processing controller.
High pressure MCB
action
Check if there is an HP alarm.
Discharging
temperature alarm
Check whether a discharging low/high temperature alarm exists.
Low pressure alarm View if a low-pressure alarm exists in the history alarm.
Contactor faulty
Check if the contactor is able to energize.
Compressor driver
faulty
Check the compressor driver.
The compressor
Check whether the compressor coil is an open circuit. In such
internal protector is a scenario, wait till the coil is cooled following which it will be
open
automatically restored.
The Compressor
stops after running
for 3 minutes,
contactor open
Refrigerant leaked,
the low-pressure
check is too low or
abnormal
Check the suction pressure.
Check the circuit of the low-pressure sensor.
Calibrate accordingly so that the low-pressure sensor reader is
within ±0.3 bar range of the actual pressure.
Condenser clogged Clean the condenser.
High pressure
protection
Low exhaust
pressure
The suction and
exhaust pressures
do not change
after startup
Condenser system
does not start
Check the condenser fan for the air-cooled system.
Too much
refrigerant has
been charged
Check whether the sub-cooling degree is too high.
Refrigerant leaked
Locate the leakage point, repair it and add the refrigerant.
The fan speed
controller of the
outdoor unit is
faulty, while the
output voltage
remains 100%,
irrespective of
the change in
the condensing
pressure
If the fan speed controller is found faulty, then it has to be
replaced .
Either the
compressor
is reversed or
the internal air
tightness of the
compressor has
failed
If the compressor is reversed, exchange any two L lines of the
compressor. If the internal air tightness of the compressor has
failed and cannot be restored, replace the compressor.
Vertiv | Liebert® CRV4 | User Manual
103
Troubleshooting
Symptom
Low suction
pressure or liquid
returned
Compressor too
noisy
Possible Causes
Items to be Checked or Handling Method
Insufficient
refrigerant in the
system
Check for leaks. Seal the leaking point and add the refrigerant.
Air filter too dirty
Replace the air filter.
Filter dryer clogged
Replace the filter dryer.
Improper superheating degree
Check the control board of the Electronic Expansion Valve (EEV).
Sensing element
of the Electronic
Expansion Valve
(EEV) is faulty
Replace the sensing element.
Improper airflow
distribution
Check the air supply and return systems.
Low condensing
pressure
Check whether the condenser is faulty.
Liquid returned
Refer to the handling methods of “Low suction pressure” or “liquid
returned”.
Bearing worn out
due to lubricant
loss
Add lubricant.
Too high
compression ratio
Compressor over
temperature
Too high suction
overheat
temperature
(degree)
Vertiv | Liebert® CRV4 | User Manual
Check the settings of the HP switch and LP switch, and inspect if
the condenser is clogged.
Check that the fans of the evaporator and condenser are normal.
Regulate the EEV or add proper amount of refrigerant.
104

Appendix I: Circuit Diagram of Model CR025, CR035 and CR045
电
电
电
电
电
CS
LS
A
BR
BK
J38-1
R
BR
BK
J43-1
1
J43-2
2 J43
J43-3
3
J38-2
E/B
1
J38
2
J33-3
J33-4
J33
1 2 3 4
J34-1
1
J34-2
2
J34-3
J34 3 J34-4
4
J34-5
5
6
O
R
YE
BK
BR
BR
BK
BK
BR
J32-1
J32-2
J32
1 2
Circuit Diagram of CR025
Vertiv | Liebert® CRV4 | User Manual
105

电
电
电
电
电
CS
LS
A
BR
BK
J38-1
R
BR
BK
J43-1
1
J43-2
2 J43
J43-3
3
J38-2
E/B
1
J38
2
J32-1
J32-2
J33-3
J33-4
BR
BK
J33
1 2 3 4
BK
BR
J32
1 2
J34-1
1
J34-2
2
J34-3
J34 3 J34-4
4
J34-5
5
6
O
R
YE
BK
BR
Circuit Diagram of CR035
Vertiv | Liebert® CRV4 | User Manual
106

电
电
电
电
电
CS
LS
A
BR
BK
J38-1
R
BR
BK
J43-1
1
J43-2
2 J43
J43-3
3
BK
BR
J33
1 2 3 4
J33-3
J33-4
J32-1
J32-2
J32
1 2
J34-1
J34-2
J34-3
J34-4
J34-5
O
R
YE
BK
BR
J35-1
1
J35-2
2
J35-3
J35 3 J35-4
4
J35-5
5
6
O
R
YE
BK
BR
1
2
J34 3
4
5
6
1
J38
2
BR
BK
J38-2
E/B
Circuit Diagram of CR045
Vertiv | Liebert® CRV4 | User Manual
107

Appendix II: Display Menu Structure of the Screens
Display Screen Menus for Graphical Color Screen
Vertiv | Liebert® CRV4 | User Manual
108

Display Screen Menus for LCD Text Screen
Vertiv | Liebert® CRV4 | User Manual
109

Appendix III: Alarm Menu Control Table
High pressure alarm
Air loss alarm
Air exhaust temp sensor fault
CP drive protection U16
(abnormal communication
with the motherboard)
Low pressure alarm
Fan detection board
communication fault
Wind pressure sensor {n} fault
CP drive lock
Air exhaust high temp alarm
Fan {n} fault alarm
Compressor drive
communication fault
EEV communication fault
Low superheat alarm
Humidifier fault alarm
Compressor drive
communication fault lock
EEV drive fault
High pressure lock alarm
High water level alarm
CP drive protection U01
(inverter hardware
over-current)
Air suction temp sensor
fault
Low pressure lock alarm
Electrical heating fault
alarm
CP drive protection U02
Low pressure sensor fault
(compressor output phase loss)
Air exhaust high temp alarm
Smoke detector alarm
CP over-current reminder
Power loss alarm
Air exhaust low superheat
lock alarm
Fire sensor alarm
CP drive protection U03
(compressor over-current)
Power phase loss alarm
High pressure abnormal alarm Lightning protection alarm
CP drive protection U04
(Input voltage phase loss)
Power supply over-voltage
alarm
Low pressure sensor fault lock Self defined 1 alarm
CP drive protection U05
(busbar voltage imbalance)
Power supply under-voltage
alarm
Supply air high temp alarm
Self defined 2 alarm
CP drive protection U06 (power Power frequency offset
component overheat shutdown) alarm
Supply air low temp alarm
Remote shutdown alarm
CP drive protection U07
(motor stall)
Power supply reverse phase
rotation alarm
Remote high temp alarm
Floor overflow alarm
CP drive protection U08
(DC bus over-voltage)
Teamwork address
repetition
Remote low temp alarm
Supply air temp sensor {n}
fault
CP drive protection U09
(DC bus under-voltage)
Teamwork master unit loss
Remote high humidity alarm
Supply air humidity sensor
{n} fault alarm
CP drive protection U10
(AC input over-voltage)
Teamwork slave unit loss
Remote low humidity alarm
Return air temp sensor {n}
fault alarm
CP drive protection U11
(AC input under-voltage)
Filter blockage alarm
Return air high temp alarm
Return air humidity sensor
{n} fault alarm
CP drive protection U12
(NA)
Filter maintenance reminder
Return air low temp alarm
Remote temp sensor {n}
fault alarm
CP drive protection U13
(Other fault)
Return air high humidity alarm
Remote humidity sensor {n} CP drive protection U14
fault alarm
( temp sensor fault)
Return air low humidity alarm
High pressure sensor fault
alarm
Vertiv | Liebert® CRV4 | User Manual
CP drive protection U15
(drive fan fault)
110

Appendix IV: Routine Maintenance Inspection Items
(Monthly)
Date: _____________________________ Prepared by: _____________________________
Model: _____________________________ Serial Number: _____________________________
Routine Maintenance Inspection Items Checklist (Monthly)
Part
Check Item
Remark
Check for clogging or damage
Filter
Check the filter clog switch
Clean the filter
Check for fan blades are not distorted.
Fan
Check the bearings are not worn out
Belt tightness and its state
Compressor
Check for leakage
Listen to the operation sound, observe the operation vibration
Check the fins are clean
The fan base should be firm
Air-cooled condenser
(if used)
The fan vibration absorber is not deteriorated or damaged
The SPD board should be effective (in the storming seasons, the SPD
board should be check once a week)
The refrigerant pipes are properly supported
Check the suction pressure
Refrigeration cycle
system
Check the discharge pressure
Check the refrigerant pipes for signs of leaks
Check the moisture conditions in the system through the sight glass
Check the Electronic Expansion Valve (EEV)
Heating system
Check the re-heater operation
Check the erosion situation of the components
Signature_________________________________________________________
Note: Please copy this table as a record keeping purposes.
Vertiv | Liebert® CRV4 | User Manual
111

Appendix V: Routine Maintenance Inspection Items
(Semi-annually)
Date: _____________________________ Prepared by: _____________________________
Model: _____________________________ Serial Number: _____________________________
Routine Maintenance Inspection Item Checklist (Semi-annually)
Part
Check Item
Remark
Check for clogging or damage
Filter
Check the filter clog switch
Clean the filter
Check for fan blades are not distorted
Fan
Check, whether there is bearing worn out
Check and fasten the circuit connector
Check for leakage
Compressor
Listen to the operation sound, observe the operation vibration
Check and fasten the circuit connections
Check the fins are clean
The fan base should be firmed
The fan vibration absorber is not deteriorated or damaged
Air-cooled condenser
(if used)
The SPD board should be effective (in the storming seasons, the SPD
board should be check once a week)
Check the voltage regulating function of the rotation speed controller
The temperature switch is set at the required position
The refrigerant pipes are properly supported
Check and fasten the circuit connections
Check the suction pressure
Check the suction pressure and suction superheat degree
Refrigeration cycle
system
Check the discharge pressure and condensing sub-cooling degree
Check the refrigerant pipes
Check the thermal expansion valve
Check whether refrigerant needs to be added (through the sight glass)
Vertiv | Liebert® CRV4 | User Manual
112

Part
Check Item
Remark
Check the re-heater operation
Heating system
Check the erosion situation of the components
Check and fasten the circuit connections
Check the fuses and MCB
Electrical control part
Check and fasten the circuit connections
Check the control program
Check the contactor suction
Signature_________________________________________________________
Note: Please copy this table as a record keeping purposes.
Vertiv | Liebert® CRV4 | User Manual
113

Appendix VI: Table Names and Content of Harmful
Substances in Products
Harmful Substances in Products
Harmful Substance
Lead
(Pb)
Mercury
(Hg)
Cadmium
(Cd)
Chrome6+
(Cr6+)
Polybrominated
biphenyls (PBB)
Polybrominated
diphenyl ethers
(PBDE)
Cabinets
○
○
○
○
○
○
Refrigeration
accessories
○
○
○
○
○
○
Fan unit
○
○
○
○
○
○
Heating unit
○
○
○
○
○
○
ECU
○
○
○
○
○
○
LCD
○
○
○
○
○
Heat exchanger
×
×
○
○
○
○
○
Copper pipes
○
○
○
○
○
○
Cables
○
○
○
○
○
○
Part Name
O: Means the content of the hazardous substances in all the average quality materials of the part is within the limits
specified in SJ/T-11363-2006;
X: Means the content of the hazardous substances in at least one of the average quality materials of the part is outside
the limits specified in SJ/T11363-2006
Vertiv has been committed to the design and manufacture of environmentally friendly products, we will reduce and
eliminate toxic and hazardous substances in products through ongoing research. The following application components,
or toxic and hazardous substances is not limited to the current level of technology or no reliable alternative mature
solution:
1. Parts of the above reasons lead: Copper alloy member containing lead; high temperature solder of lead; high
temperature solder of lead diodes; uranium glass resistor lead (exempt); electronic ceramics containing lead (exempt);
2. The backlight lamp contains Mercury;
3. Distribution of the switch contact portion containing Cadmium and Cadmium compounds
Notes on environmental protection use period: Environmental protection use period of the product (identified in the
body of the product), means that under normal conditions of use and compliance with safety precautions from the
date of production of this product (excluding battery) Term toxic and hazardous substances or elements contained no
serious impact on the environment, persons and property.
Scope: Liebert® CRV4™ series of Precision Air Conditioning
Vertiv | Liebert® CRV4 | User Manual
114
© 2019 Vertiv Group Corp. All rights reserved. Vertiv™ and the Vertiv logo are trademarks or registered marks of Vertiv Group Corp. All other names and
logos referred to are trade names, trademarks, or registered trademarks of their respective owners. While every precaution has been taken to ensure
accuracy and completeness herein. Vertiv assumes no responsibility and disclaims all liability, for damages resulting from use of this information or for any
errors or omissions. Specifications are subject to change without notice.