Vertiv Liebert CRV Plus User Manual

Liebert CRV+
Precision Air Conditioner

User Manual

Copyright by Vertiv Co. Ltd.

The content in this document is subject to change without notice. All rights, including rights of
translation, reproduced by printing, copying or similar methods, and even of parts, are reserved. Violators
will be liable for damages. All rights, including rights deriving from patent license or registration of a
utility model or design, are reserved. No part of this document may be reproduced or transmitted in any
form or by any means without the prior written consent of Vertiv Co. Ltd.

Notice

The purchased products, services, and features are stipulated by the contract made between Vertiv Co.,
and the customer. All or part of the products, services, and features described in this document may not
be within the purchasing scope or the usage scope. Unless otherwise specified in the contract, all
statements, information, and recommendations in this document are provided "AS IS" without warranties,
guarantees or representations of any kind, either express or implied. The information in this document is
subject to change without notice. Every effort has been made in the preparation of this document to
ensure the accuracy of the contents, but all statements, information, and recommendations in this
document do not constitute a warranty of any kind, express or implied.

Vertiv Co., Ltd.

• China

Website: www.vertivco.com

E-mail: [e-mail]

mer service hotline: [phone]

Custo

• Asia Pacific

Homepage: www.vertivco.com.

E-mail: [e-mail]

For Technical Support, users may contact the nearest Vertiv Co. local sales office or service center.

Purpose of the Document

Warning/Danger/Caution

potentially harmful situation that can result in death or injury. It

which may result in danger and safety issues thereby having an

The Note section indicates additional and useful information,

help make maximum utilization of the resources at hand. Helpful

information related to the mainstream stuff also comes under

This doc

ument applies to the Liebert CRV+ series of precision air conditioners and cooling solutions
which maintain an optimal environmental control mainly for testing laboratories, data center rooms and
similar technological ecosystems at minimal operating costs. This document explains the product
description, installation measures, operational workflow, maintenance, and detailed aspects from the user
perspective. The figures used in this document are for reference only.

Please read this manual carefully before installing, maintaining, and troubleshooting, especially the
warning information in the manual

Styling used in this Guide

The styles used in the manual will be defined as mentioned in the following table:

Situation Description

Warning/Danger/Caution

The

also indicates instructions that need to be adhered to, failing

adverse effect on the reliability of the device and security. Even

for practices not related to physical injury, the content under

the Warning heading is used for precautions which need to be

taken which, otherwise, could result in equipment damage,

performance degradation, or interruption in service.

note indicates a hazardous or

Note

Version History

Issue

1 V1.0 ---

including tips and tweaks. It also calls attention to best

practices and industry-best protocols that are standardized and

the Note heading helping the users get to grips with the

definitions, concepts, and terminologies used in the manual.

Revision

Changes

Safety Precautions & Measures

The important safety precautions and measures that should be followed during the installation and
maintenance of the Liebert CRV+ models are described in the following sections.

Read the manual prior to installation and operation of the unit. Only qualified personnel should move,
install, or service this equipment.

The user reads and takes into account all the precautions, compliance, and safety measures before
working on the equipment. The unit control must be used exclusively for the purpose which it is
intended for; the manufacturer takes no liability for incorrect use or a modification to the unit control.

Adhere to all the Warnings and Cautionary measures included in the manual.

Please read this manual carefully before installing, maintaining and troubleshooting; especially
the Warni
pay attention to the warning labels on the unit and its components.

This manual is retained for the entire service life of the machine. The user must read all the precautions,
danger, warnings, and cautionary measures mentioned in the manual prior to carrying out any operations
on the machine. Each machine is equipped with an electrical insulation, which allows the users to work in
safe conditions. The main switch is positioned on the electrical panel cover; Open the right door to access
it. Before any maintenance operation, switch off the machine with this electronic insulation device in order
to eliminate risks such as electrical shocks, burns, automatic restarting, moving parts, and remote
control. The panel key, supplied along with the unit, must be kept by the personnel responsible for the
maintenance. The protective covers can be removed after the electric power has been cut off by opening
the main switch.

ng/ Danger/ Caution information in the User Guide. Apart from the User Guide, also

In the following section, take a look at the various cautionary measures and warnings that need to be read
carefully prior to installing or operating the system.

Disconnect the local and remote power supplies prior to working with the unit.

Prior to the installation process, read all the instructions, verify if all the parts are in place, and check the
nameplate to ensure that the voltage matches the utility power that is available for that unit.

The controller doesn’t isolate power from the unit even in the Off mode. Moreover, some internal
components require and receive power even during the Off mode.

If the unit door is open while the fans are operating, the airflow may result in abrupt slamming of the door
resulting in injury. Another aspect is the presence of small objects in the fans bay which may result in
object ejection during the fan start-up and there is a probable risk of being hit by these objects leading to
grievous injury as well as causing equipment damage.

The CRV+ unit isolation switch is inside the unit. The line side of this switch contains live high voltage.
In order to ensure there is no voltage inside the unit, install and open a remote isolation switch.

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 leaking water that can cause damage to the equipment as well as the building. There
should be an effective water drain connection and facilities. Installation should be precise.
Implementation of the application and service practices should be suitable and fault-free. Not complying
with these norms will result in water leakage from the unit. Water leakage can result in massive damage
and loss of critical equipment in the hosting ecosystem. Therefore, care should be taken to ensure that
the unit must not be located directly above any equipment that could sustain damage due to water and
excessive moisture. Using a leak detection system for unit and system supply lines are recommended by
Vertiv Co.

TABLE OF CONTENTS

Chapter 1 Introduction ........................................................................................................... 1

1.1 Model Nomenclature .................................................................................................................... 2

1.2 Basic Performance Parameters................................................................................................. 2

1.3 Product Description .................................................................................................................... 3

1.3.1 DC Brushless Compressor................................................................................................................. 4

1.3.2 Fan ....................................................................................................................................................... 5

1.3.3 Evaporator .......................................................................................................................................... 5

1.3.4 Electronic Expansion Valve (EEV) ................................................................................................... 6

1.3.5 Electrode Humidifier ......................................................................................................................... 6

1.3.6 Electric Heater ................................................................................................................................... 7

1.3.7 Sight Glass .......................................................................................................................................... 7

1.3.8 Filter Drier........................................................................................................................................... 7

1.3.9 Micro-Controller ................................................................................................................................ 7

1.3.10 Condenser ......................................................................................................................................... 8

1.4 Optional Equipment .....................................................................................................................8

1.5 Working Conditions .....................................................................................................................9

1.5.1 Operating Environment ..................................................................................................................... 9

1.5.2 Storage Environment ........................................................................................................................ 9

1.5.3 Refrigerant Charging Requirement ............................................................................................... 10

Chapter 2 Installation ........................................................................................................... 12

2.1 Pre-installation ........................................................................................................................... 12

2.1.1 Transportation & Movement........................................................................................................... 12

2.1.2 Unpacking ......................................................................................................................................... 13

2.1.3 Inspection ......................................................................................................................................... 14

2.2 Installation Preparation (Site Preparation) ......................................................................... 14

2.2.1 Equipment Room Requirement ...................................................................................................... 14

2.2.2 Installation Space requirements ................................................................................................... 15

2.2.3 Installation Tools ............................................................................................................................. 16

2.3 Mechanical Installation ............................................................................................................ 17

2.3.1 System arrangement during installation ...................................................................................... 18

2.3.2 System Installation Mode ............................................................................................................... 19

2.3.3 Product Dimensions ........................................................................................................................ 20

2.3.4 Installation Procedures .................................................................................................................. 23

2.3.5 Piping ................................................................................................................................................ 26

2.3.6 Removing Transportation Fastener and Vibration Absorber ................................................... 34

2.3.7 Checklist for completed mechanical installation ........................................................................ 36

2.4 Electrical Installation................................................................................................................37

2.4.1 On-site Wire connections ............................................................................................................... 37

2.4.2 Installation Notes ............................................................................................................................ 37

2.4.3 Connecting cables of the Indoor unit ........................................................................................... 38

2.5 Commissioning Overview ....................................................................................................... 43

2.5.1 Self Check ......................................................................................................................................... 43

2.5.2 Preparations for Startup ................................................................................................................ 44

2.5.3 Startup Inspection .......................................................................................................................... 46

Chapter 3 System Operation & General Maintenance .................................... 50

3

.1

System Operation

3.1.1 Micro-Controller ............................................................................................................................... 50

3.1.2 Control buttons ................................................................................................................................ 50

3.1.3 Common Operational function examples ..................................................................................... 51

3.1.4 Main Screen ...................................................................................................................................... 52

3.1.5 Password interface .......................................................................................................................... 53

3.1.6 Menu Structure ................................................................................................................................ 53

3.2 General Maintenance ............................................................................................................... 69

3.2.1 Routine Maintenance & Inspection (Monthly) ............................................................................. 69

3.2.2 Routine Maintenance and Inspection (Half -Yearly) .................................................................. 70

3.2.3 Self-Diagnosing Functions ............................................................................................................. 71

3.2.4 Maintenance of Electrical Control utilities .................................................................................. 71

3.2.5 Air Filter Maintenance .................................................................................................................... 73

3.2.6 Fan Kit Maintenance ....................................................................................................................... 74

3.2.7 Electrical Heater Maintenance ...................................................................................................... 74

3.2.8 Refrigerating System Maintenance .............................................................................................. 74

3.2.9 Drainage system maintenance ...................................................................................................... 74

3.2.10 Troubleshooting ............................................................................................................................ 75

....................................................................................................................

..

50

APPENDIX 1 - Circuit Diagrams ............................................................................................................ 79

APPENDIX 2 - Micro-processing Controller Menu Structure................................................................ 82

APPENDIX 3 - Alarm Control Menu Table ............................................................................................ 84

APPENDIX 4 - Hazardous Substances or Elements Declaration .......................................................... 85

APPENDIX 5 - Troubleshooting of Common Startup Faults ................................................................. 86

PART I

GENERAL INFORMATION

Chapter 1 Introduction

The Liebert CRV+ series is the next generation series of air conditioners that provide precise
environmental control. The Liebert CRV+ models are the latest in the long line of modern enterprise­grade products from the Liebert family. Incorporating the high standards associated with the Liebert
name, the CRV+ series utilizes the latest technology, system components, and streamlined
manufacturing process.

Liebert CRV+ air conditioners are products that are specifically created and designed for the small-and­medium data centers, computer rooms, and similar ecosystems which call for a high degree of accuracy
and precision. It addresses the needs and challenges associated with such applications and setups. It
caters to sensitive applications which need a suitable environment for optimal performance. Therefore,
care should be taken while testing these sensitive products or maintaining a favorable environment for
mission critical equipment, as even a slight deviation may lead to inaccurate results. Precision Air
Conditioning must not only keep room conditions within a specific range but also must have the
precision to react quickly to a drastic change in heat load and prevent wide temperature fluctuations.

The CRV+ air cooled AC unit is packed with features such as high reliability, high sensible heat ratio, and
large airflow. The unit is an air-cooled single cooling system and configured with DC Speed Regulation
back- inclined centrifugal fan.

Packed with a host of features, it lowers the sound emissions significantly and thereby reduces the noise
pollution. It is a top-notch system that adheres to the standard in Precision Air Cooling in terms of
energy-efficiency, space requirements, and reliability.

Figure 1-1 shows the appearance of various models in the Liebert CRV+ series:

Vertiv | Liebert CRV+ | User Manual 1

1-1 Models in the CRV+ series

Figure

1.1 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 H A 1 3 8 O S 0

2 E 1 0 0 0 0 C V 0 0

0

CR Liebert CRV+

Bit 3 ~ Bit 5 Series Name Description

Bit 6 Air Discharge

R Horizontal supply with guide grill

Horizontal supply without guide grill

Bit 7 System Type

A

Bit 8Airflow

1 EC Fan

Bit 9 Power Supply

3 380-415V/3 ph/50Hz +N

T 380/3 ph/60Hz +N

CR025

20.8

6.1 3 1.5

The model nomenclature of the CRV+ air cooled unit is shown in Figure 1-2:

Bit 1 and Bit 2 Product Model Bit 14 Filter

G4 with filter clogged switch

G4

Standard DX Air Cooled Coiled &

Electronic Expansion Valve (EEV)

With condensate drain pump

None

025 Nominal Capacity

H

Air cooled

Bit 10 System Configuration

8 R-410A brushless scroll compressor
Bit 11 Humidifier
0 None
S Electrode humidifier
Bit 12 Display
L Large Display
S Standard display panel
Bit 13 Heating
0
1

None
Electrical heater

0
2

Bit 15 Coil and value
E

Bit 16 Cabinet Color
1 Standard color ( Z-7021 black-grey)
Bit 17 High Pressure Option
0 None
Bit 18 Low Voltage Locking Option
0 None
Bit 19 Monitor
0 None
S SIC Card
Bit 20 Detector
0 None
Bit 21 Package
P Domestic
C Overseas (sea worthy)
Bit 22 Special Function
A None
V

Bit 23~25 Special Identifier for order

0

Figure 1-2 Model Nomenclature

1.2 Basic Performance Parameters

The basic performance parameters of the Liebert CRV+ AC series are given in Table within Listing 1.1.

Listing 1.1

Model

Nominal cooling

capacity (kW)

CR012 13.6 3.3 2 /

CR035 38.1 10.1 5.5 1.5

Condition: Return air 37˚C, 24%RH & 45˚C condensing temperature

Vertiv | Liebert CRV+ | User Manual 2

Power

(kW)

Heating capacity

(kW)

Humidification

capacity (kg/h)

1.3 Product Description

The Liebert CRV+ cooling unit is a comprehensive system that includes all the main functions
fundamental to precision cooling units such as cooling, humidification, dehumidification, re-heating, air
filtration, condensation management, temperature and humidity control, alarm functions and
compatibility with data communications. Liebert CRV+ is designed to comply with mission-critical
requirements and ensure that servers are maintained at the correct temperature and humidity levels.

Figure 1-3 shows the various components and their respective locations:

Vertiv | Liebert CRV+ | User Manual 3

Figure 1-3 Components and their locations

Listing 1.2

2

Electric box

Top humidifier water supply

5

EC plug fans

Item Description Item Description

1 Top electrical entrance 7

8

3

condesate-pump drain

4 Supply and Return 10

6 Electric heaters

Model Dimensions (W x D x H)(mm)

CR012HA1380S02E10000PV000

CR012RA1380S12E10000PV000

CR025HA1380S02E10000PV000

CR025RA138SS12E10000PV000

CR035HA1380S02E10000PV000

CR035RA138SS12E10000PV000

9 Bottom electrical entrance

11

12

Humidifier

Condensate pump

Bottom condensate-pump drain

Evaporator Coil

Compressor

300 x 1100 x 2000

300 x 1100 x 2000

600 x 1100 x 2000

In the following sections, take a look at the list of components used in the Liebert CRV+ Precision Air
conditioning series.

1.3.1 DC Brushless Compressor

The Liebert CRV+ series models comprise of a DC Brushless compressor which has a host of
promising features as mentioned in the following list:

 Low operational noise
 Rapid Cooling
 Less Vibration

Moreover, there are no brushes compared to typical DC motors. Its compactness, reliability, longer life
time, and better capacity control combined with streamlined energy-efficiency make it an ideal
compressor to bank on for the CRV+ series.

Figure 1-4 shows the image of a DC brushless compressor:

Vertiv | Liebert CRV+ | User Manual

Figure 1-4 DC Brushless compressor

4

1.3.2 Fan

The EC Fans used in the Liebert CRV+ models are energy-efficient and innovative with integrated
electronics and a maintenance-free design.

 Ability to regulate the airflow and reduce the fan input power leading to high energy-efficiency
 Easy-to-connect facility with minimum wiring leading to high performance with a great variety of

possible air flow rates

Figure 1-5 shows the EC Fans used in the models belonging to the CRV+ series:

Figure 1-5 EC Fans

1.3.3 Evaporator

The sophisticated design of the distributor ensures that the refrigerant is distributed evenly in each loop,
thereby improving the effectiveness of the heat exchanger.

 Streamlined Heat exchanger design and air distribution for optimum performance
 Fin-tube heat exchanger for higher efficiency

Figure 1-6 shows the image of an Evaporator:

Figure 1-6 Evaporator

Vertiv | Liebert CRV+ | User Manual 5

1.3.4 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. The EEV's
wide operating envelope also lowers down the condensing pressure, thereby resulting in significant
energy savings.

 Designed for modulating control of the refrigerant mass flow with precision
 Ensures effective control on super-heating at t
 Better low load capacity
 Designed for easy Installation-and-Service

Figure 1-7 depicts the image for the EEV used in the CRV+ Series:

he end of the evaporator

Figure 1-7 EEV

.3.5 Electrode Humidifier

1

The Electrode humidifier helps to maintain constant humidity in test chambers and is quite efficient
in small-and medium-load applications.

Figure 1-8 depicts the image of an Electrode Humidifier:

Figure 1-8 Electrode Humidifier

Vertiv | Liebert CRV+ | User Manual 6

1.3.6 Electric Heater

In the CRV+ models, the PTC heaters are used as they have lower running temperatures, thereby
ensuring operational safety.

 Less susceptible to overheating and long lasting due to less wear
 Lower Maintenance and Smooth operation

Figure 1-9 shows an image of the Electric Heater:

Figure 1-9 PTC heater

1.3.7 Sight Glass

The sight glass is a utility for observing the refrigerant state; specifically the moisture content of the
system. If the moisture content exceeds the levels of defined standards, the color changes, thereby,
indicating irregularity in the moisture content.

1.3.8 Filter Drier

Moisture can adversely affect the operations and service life of a system in the refrigeration lifecycle. In
order to rectify that condition, filter driers are used to filter out particles, remove, and hold moisture to
prevent it from circulating through the system.

1.3.9 Micro-Controller

The Micro-Controller used in CRV+ provides a simple operational user-interface and is developed using
the latest and highly advanced PID regulation technology.

 Multilevel Password protection
 Self-recovery upon power failure, high-voltage & low-voltage protection
 Phase loss protection
 Automatic phase-sequence switching upon the anti - phase and rotate speed control of the

outdoor fan

 High-end Fault diagnostic system to facilitate easy equipment maintenance

Vertiv | Liebert CRV+ | User Manual 7

Figure 1-10 shows the image of the micro-controller:

Figure 1-10 Display panel of the Controller

1.3.10 C

The Liebert range of air condensers offers many advantages, some of which are listed below:

Figure 1-11 shows the image of the condenser used in the CRV+ series:

ondenser

arp and Powerful design

 Sh
 Antirust aluminum cabinets
 Low sound levels
 High reliability over a wide range of ambient conditions

Figure 1-11 Condenser

For more information on the condenser, refer to the separate condenser manual which explains the
entire condenser ecosystem in detail.

1.4 Optional Equipment

The Liebert CRV+ series is compatible with multiple temperature/humidity sensors based on the
requirement.

An interesting development is the compatibility with the Liebert CRV+ series models with the Modbus
protocol. Through the configured RS 485 port or TCP/IP port, the CRV+ systems can communicate with
the host computer in addition to remotely taking charge of the host software.

Vertiv | Liebert CRV+ | User Manual 8

1.5 Working Conditions

Item

Requirement

Item

Requirement

Storage environment

Indoor, clean (without dust)

Ambient temperature

-33°C ~ +70°C

In this section, take a look at the environmental conditions including the Operating and Storage
environment.

1.5.1 Operating Environment

The table in Listing 1.3 defines the Operating environment parameters including the Ambient
Temperature, Protection level, Altitude, and Voltage range.

Listing 1.3

Indoor 18°C ~ 40°C

CR012: -15°C ~ +45°C, if a low temperature kit is

Ambient temperature

Outdoor

Protection level (indoor unit) IP20

Altitude < 1000m. Above that, please contact Vertiv Co.

configured, the lowest outdoor operation
temperature is -34°C

CR025 and CR035: -20°C ~ +45°C, if a low
temperature kit is configured, the lowest outdoor
operation temperature is -34°C

Operation voltage range (380 ~ 415)V ± 10%, 3N ~ 50Hz / 60Hz

1.5.2 Storage Environment

The following table in Listing 1.4 defines the Storage Environment parameters including the ambient
humidity, ambient temperature, and storage time conditions.

Listing 1.4

Ambient humidity < 95%RH

Storage time

Total transportation and storage time should not exceed six months.
Otherwise, the performance needs to be re-calibrated

Vertiv | Liebert CRV+ | User Manual 9

1.5.3 Refrigerant Charging Requirement

Brand

Logo

Note

Another essential aspect is the quality and make of the refrigerant oil. Adding poor quality oil,
counterfeit oil, or oil for a different model will damage the system. The quality issue due to
the wrong refrigerant oil will result in voiding of the warranty.

Low quality or counterfeit refr

igerant will damage the system drastically. Use the refrigerant approved by

Vertiv Co., Ltd. to avoid the system abnormality or damage caused by using other brands of refrigerant.

Listing 1.5 depicts the refrigerant brands, which are approved by Vertiv Co. Ltd.

Listing 1.5

DU PONT The DU PONT refrigerant adapts a custom made package

JUHUA

Vertiv | Liebert CRV+ | User Manual 10

Part II

INSTALLATION

Vertiv | Liebert CRV+ | User Manual 11

Chapter 2 Installation

The Installation process consists of the following procedures, namely-

 Pre-installation
 Installation Preparation
 Mechanical Installation
 Electrical Installation

2.1 Pre-installation

Pre-installation contains the following 3 sub sections, namely-

 Transportation & Movement
 Unpacking

 Inspection

2.1.1 Transportation & Movement

When it comes to transporting the system, Railroad is the most preferable choice. However, if railroad
transportation is not possible, then the truck transport option is an optimal choice. One precaution is to
choose roads that do not have too many bumps and if any, avoid it as much as possible.

 Liebert CRV+ systems are on the heavier side and therefore, it is recommended that equipment

like an electric forklift is utilized for these heavy duty systems.

 Move the equipment to a location which is in the vicinity of the installation site.
 If an electric forklift is used, insert the tines of the forklift below the pallet as displayed in

Figure 2-1. Align the tines with the center of gravity to prevent the equipment from falling over.
Figure 2-1 depicts the way the tines of the forklift are inserted below the pallet and in the same
image, the graphic to the right indicates that the tines are aligned with the center of gravity to
prevent the equipment from falling over:

Figure 2-1 Moving the equipment using a Forklift truck

Vertiv | Liebert CRV+ | User Manual 12

In the previous figure (Figure 2-1), the air conditioner is lifted using the forklift truck and is aligned with
the center of gravity. While moving the indoor unit, the obliquity has to be maintained with an angle of 75°
to 105°.

Figure 2-2 depicts the 75° to 105° obliquity that is suitable to move the air conditioning package to the
vicinity of the desired location:

Figure 2-2 Obliquity of the system

2.1.2 Unpacking

The cabinet uses a honeycomb cardboard and winding stretch film for packaging purposes. Shift the
product to a location closer to the final installation site prior to unpacking the unit.

Initially, remove the top cover and winding stretch film. Next, remove the honeycomb cardboard as
depicted in Figure 2-3.

Figure 2-3 Unpacking the outer package

Vertiv | Liebert CRV+ | User Manual 13

The unit is fixed on the packing pallet with M8*20 and M8*80 screws. Use a 17mm open-end spanner,
ratchet spanner, or sleeve to remove the screws.

Refer to Figure 2-4 to see the schematic diagram for the same.

Figure 2-4 Screws on the pallet

2.1.3 Inspection

Moving forward, check the system fittings and its components against the packing list to ensure that
everything is in place and the assembly is intact.

If any parts or components are missing or damaged, immediately report to the carrier about the same. If
hidden damages are observed, then contact the local offices of that carrier as well as Vertiv Co. at the
earliest.

2.2 Installation Preparation (Site Preparation)

The CRV+ series of air conditioners is streamlined for maintaining a favorable environment for data
centers, computer rooms, and similar ecosystems. Strict adherence to the installation procedures is
mandatory in order to ascertain proper installation of the air conditioner.

2.2.1 Equipment Room Requirement

The equipment room must be prepared to ensure a smooth operation flow and obtain accurate results.
The equipment room must meet the standards for appropriate ventilation and heating. The design
specifications for the air conditioners must be ideal and should match the energy-efficient design
standards.

Following are the requirements for maintaining a favorable room environment prior to installation:

 The equi
 The outdoor air entering in should be kept at a minimum. The outside air will add the loads of

heating, cooling, humidifying, and dehumidifying of the system. It is recommended that the
inhalation of outside air be kept below 5% of the total indoor airflow.

 All the doors and windows should be properly sealed to minimize the leakage. The seams should

be as narrow as possible.

pment room should be well insulated and have a sealed damp-proof layer.

Vertiv | Liebert CRV+ | User Manual 14

Vertiv Co.

However, if these requirements are not met, rectifications must be made on the site so that
it complies with the specified requirements and conditions. However, if the recommended
rectifications or modifications are not implemented, then

accuracy and precision of the temperature and humidity provided by the
models. One important aspect to be considered is that the indoor unit must not be used for

the outdoor environment.

recommends that the site preparation is defined as per the requirements.

Vertiv Co.

does not guarantee the

Liebert CRV+

2.2.2 Installation Space requirements

Air conditioners in the Liebert CRV+ series are advanced precision air cooling units and therefore, these
air conditioners must be installed, preferably in a row of cabinets with high heat density and in a hot aisle
and cold aisle arrangement.

Allocate space so that it is accessible for the qualified service personnel for repairs, servicing, and
maintenance. For the CRV+ range, maintenance space must be allocated at the front and rear of the
equipment.

At the least, a space of 600 mm must be assigned for maintenance purposes in front of the system. A
minimum space of 600mm must be assigned for maintenance on the rear of the system.

The allocated space is to facilitate regular maintenance tasks such as replacement of the filter, blower,
and humidifier among others.

Figure 2-5 depicts the space allocated for servicing and maintenance.

Figure 2-5 CRV+ maintenance space

Contact the

work at an optimal level.

Vertiv Co

. team for special applications, which would need some modifications to

Vertiv | Liebert CRV+ | User Manual 15

2.2.3 Installation Tools

Name

Drawing

Name

Drawing

Cross head

Insulated torque

Listing 2.1 shows the generic toolsets and utilities used in the installation and maintenance process:

Listing 2.1

Electric hand drill Adjustable wrench

Slotted screwdriver

Stepladder Forklift

Drill Wire cutting pliers

Claw hammer

Insulating shoes Antistatic gloves

Electrician knife Cable ties

Insulating tape Insulating gloves

Crimping pliers Heat shrinkable tube

screwdriver

Diagonal cutting
pliers

wrench

Multimeter Clip-on ammeter

The tools mentioned in Listing 2.1 are generic and commonplace; however, depending on various factors
such as site environment, cables, installation equipment, and on-site electrical connections these tools
may vary in a real-time scenario.

Ensure that the tools used in the installation, operation, and maintenance processes are
insulated. This safety measure is important for professionals and service personnel who
work with this CRV+ range air conditioner.

Vertiv | Liebert CRV+ | User Manual 16

rque screwdriver

To

2.3 Mechanical Installation

Proper installation is important to achieve optimal performance and prolong the product life. In
this section, the mechanical installation will be discussed in detail to help the personnel get to
grips with the installation process.

fore proceeding with the mechanical installation, the following safety precautions need to be

Be
taken into account.

 Prior to installation, ensure that the installation procedures have been read and implemented as

per the requirement. (Refer to section 2.2 on Installation Preparation for the details). Check if any
modifications are made to the plumbing, wiring, or ventilation facility before mounting the
equipment. Once the installation preparations are taken into consideration, move on to the next
step in the installation process, and eventually set up the system.

 The CRV+ 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
outdoors or on the floor of the other rooms as per the building architecture.

 Industry-wide standards are followed for the selection, layout, and fixing of pipes.
 Several factors such as pressure drop, compressor oil return, noise reduction, and vibration are

considered during the design and installation process.

 Follow the design drawings strictly when installing the equipment. Reserve space as per the

maintenance and serviceability instructions in the previous chapter on Installation Preparation.
The manufacturer’s engineering dimension drawings must be taken as a reference while installing
the equipment.

Vertiv | Liebert CRV+ | User Manual 17

2.3.1 System arrangement during installation

The general arrangement of the CRV+ air cooled AC unit is depicted in Figure 2-6.

Figure 2-6 System Arrangement

: Factory piping.

: Field piping (by technical personnel).

The following points should be considered before checking out the overall layout diagram:

single system is used as an example to describe the entire system.

The

 Vertiv staff and qualified professionals lay out the piping in the laboratory.
 Piping is done by technicians.
 Components (marked with *) are not supplied by Vertiv Co. but are recommended for

proper circuit operation and maintenance.

 Additional components (marked with +) are required when the equivalent length exceeds

30m.

Vertiv | Liebert CRV+ | User Manual 18

2.3.2 System Installation Mode

Back bend (must be higher than the
highest copper pipe of the condenser)

Heat insulation floor Floor

Sealed

Raised floor

Humidifier

water in

The system installation schematic diagram explains the process of installation for the Condenser:

Outdoor unit

Liquid line (avoid exposure to direct sunlight)

Indoor unit

Trap

Max. 30m

Max. 7.5m

Slope discharge

Condensed

water

Figure 2-7 Condenser is placed higher than the Compressors during installation

In Figure 2-7, the condenser is installed higher than the compressor. Therefore, an inverted back bend is
fitted to the discharge line and the liquid line of the condenser. The modification is essential as it helps
prevent the liquid refrigerant from flowing back once the condenser stops. The top end of the inverted
backbend must be installed higher than the ultimate level of the copper pipe of the condenser.

However, if the condenser is installed lower than the compressor, then there is no modification required
as it fits the bill perfectly.

Vertiv | Liebert CRV+ | User Manual 19

Figure 2-8 depicts the schematic diagram of system installation when the condenser is installed at a

Heat insulation floor

Floor

Sealed

Raised floor

Humidifier

water in

water out

Indoor unit

Slope liquid

Min. 8m

Slope
discharge

Outdoor unit

lower level than the compressor.

Condensed

Figure 2-8 The Condenser is lower than the Compressor during installation

2.3.3 Product Dimensions

The dimensions and weight of the indoor unit are displayed in Figure 2-9 and in the table within Listing

2.2.

Vertiv | Liebert CRV+ | User Manual 20

Figure 2-9 Dimensions of an indoor unit