Vertiv Liebert CRV4 Series User manual

Liebert® CRV4 Series
Air-cooled Precision Air Conditioners
User Manual (Original Instructions)

Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual
Technical Support Site
If you encounter any installation or operational issues with your product, check the pertinent section of this
manual to see if the issue can be resolved by following outlined procedures.
The information contained in this document is subject to change without notice
and may not be suitable for all applications. While every precaution has been
taken to ensure the accuracy and completeness of this document, Vertiv
assumes no responsibility and disclaims all liability for damages result from
use of this information or for any errors or omissions.
Refer to local regulations and building codes relating to the application,
installation, and operation of this product. The consulting engineer, installer,
and/or end user is responsible for compliance with all applicable laws and
regulations relation to the application, installation, and operation of this
product.
The products covered by this instruction manual are manufactured and/or sold
by Vertiv. This document is the property of Vertiv and contains confidential
and proprietary information owned by Vertiv. Any copying, use, or disclosure of
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Names of companies and products are trademarks or registered trademarks of
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

TABLE OF CONTENTS
1 Product Overview 1
1.1 Product Introduction 1
1.2 Model Nomenclature 1
1.3 Product Appearance 3
1.4 Main Components 3
2 Pre-installation Guidance 5
2.1 Equipment Room Requirements 5
2.2 Installation Space Requirements 5
2.3 Environmental Requirements 6
2.3.1 Operating Environment 6
2.3.2 Storage Environment 6
2.4 Refrigerant Requirement 7
2.5 Handling, Unpacking, and Inspecting the Unit 7
2.5.1 Transporting and Handling the Unit 7
2.5.2 Unpacking the Unit 8
2.5.3 Inspecting the Unit 9
3 Mechanical Installation 11
3.1 Installation Precautions 11
3.2 System Installation Layout 12
3.2.1 System General Layout 12
3.2.2 System Installation Diagram 13
3.2.3 Mechanical Parameters 15
3.3 Installing the Indoor Unit 20
3.3.1 Leveling the Unit 20
3.3.2 Removing the Leveling Feet and Fixing the Unit 21
3.3.3 Baying the Unit 22
3.4 Installing Pipelines 22
3.4.1 Removing the Filter 23
3.4.2 Connecting Condensate Drainage Pipe on Indoor Unit 23
3.4.3 Connecting Electrode Humidifier Water Inlet Pipe 26
3.4.4 Connecting Wet Film Humidifier Water Inlet Pipe 27
3.4.5 Connecting Gas and Liquid Pipes Between Indoor and Outdoor Units 29
3.4.6 Adding Extension Kits (On-site Installation) 33
3.4.7 Charging Refrigerant and Adding Lubricating Oil 36
3.5 Removing Transportation Fastener and Vibration Absorber 37
3.6 Inspection After Mechanical Installation 38
4 Electrical Installation 39
4.1 Precautions and Procedures 39
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

4.1.1 Cables to Connect at Installation Site 39
4.1.2 Installation Precautions 39
4.2 Wiring for Indoor Unit 40
4.2.1 Indoor Unit Wiring Position 40
4.2.2 Connecting Power Supply Cable for Indoor Unit 41
4.2.3 Connecting the Control Cables 43
4.2.4 Connecting Extension Kit Solenoid Valve (Optional for On-site Installation) 45
4.3 Inspection After Electrical Installation 45
5 Commissioning the Unit 47
5.1 Position of Circuit Breaker 47
5.2 Commissioning Before Start-up 48
5.2.1 Preparation for Commissioning 48
5.2.2 Commissioning Procedures 48
5.2.3 Inspection After Commissioning 49
6 Display Screen Operation 51
6.1 Features 51
6.2 Appearance 51
6.3 Interface 52
6.3.1 Main Interface 52
6.3.2 Control Mode 54
6.3.3 Password Interface 55
6.4 Menu Structure 56
6.4.1 Main Menu 56
6.4.2 Operating Status 57
6.4.3 Alarm Information 60
6.4.4 Temperature and Humidity Setting 63
6.4.5 Parameter Setting 64
6.4.6 Temperature and Humidity Curve 71
6.4.7 Version Information 72
7 Maintenance 73
7.1 Routine Maintenance Inspection (Monthly) 73
7.2 Routine Maintenance Inspection (Semi-annually) 74
7.3 Self-diagnostic Test 75
7.4 Electrical Connection Check 75
7.4.1 Electrical System Maintenance 75
7.4.2 Control System Maintenance 76
7.4.3 Water Leak Detection Sensor 77
7.5 Filter Maintenance 77
7.6 Fan Component Maintenance 77
7.7 Electrode Humidifier Maintenance 78
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

7.7.1 Instructions for Operating Electrode Humidifier 79
7.7.2 Replacing the Humidifier 80
7.8 Wet Film Humidifier Maintenance 82
7.8.1 Instructions for Operating Wet Film Humidifier 82
7.8.2 Replacing the Wet Film Humidifier 82
7.8.3 Maintaining Water Inlet Solenoid Valve Filter 83
7.9 Electric Heater Maintenance 84
7.10 Refrigeration System Maintenance 84
7.10.1 Suction Pressure 85
7.10.2 Exhaust Pressure 85
7.10.3 EEV 85
7.10.4 Air-cooled Condenser 85
7.10.5 Compressor 85
7.11 Drainage System Maintenance 87
8 Troubleshooting 91
8.1 Fan Fault Diagnosis and Handling 91
8.2 Heating System Fault Diagnosis and Handling 92
8.3 Refrigeration System Fault Diagnosis and Handling 92
Appendix A: Display Screen Menu Structure 95
Appendix B: Alarm 97
Appendix C: Driver Alarm Code 99
Appendix D: Maintenance Inspection List 100
Appendix E: Hazardous Substances 102
Appendix F: Circuit Diagram 103
Appendix F1 CR025 Circuit Diagram 104
Appendix F2 CR035 Circuit Diagram 105
Appendix F3 CR045 Circuit Diagram 106
Appendix F4 CR036 Circuit Diagram 107
Appendix F5 CR066 Circuit Diagram 108
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

1 Product Overview
The Vertiv™ Liebert® CRV4 series air-cooled precision air conditioner (hereafter referred to as CRV4 or the unit) is a
professional equipment suitable for places that are not easily accessible to the general public. This section describes the
model description, product introduction, features, and main components of the unit.
1.1 Product Introduction
CRV4 is a precision environment control system for high heat-density environment. It provides a suitable operating
environment for sensitive equipment, industrial process equipment, communication equipment, and computers in small,
medium, and large equipment rooms.
The unit features high reliability, high sensible heat ratio, and large air volume. It is equipped with an electrode humidifier or
a wet film humidifier and uses R410A refrigerant which is environmentally-friendly and meets international requirements.
The unit is configured with the high-efficiency variable-capacity compressor and the hot-swappable, direct-current,
variable-speed axial flow fans (EC fans).
CRV4 includes two parts: indoor unit and outdoor unit. The condenser adjusts the speed of the fan through pressure,
minimizing the noise pollution to the environment while meeting the cooling requirements, improving the operation
reliability, and reducing the footprint of the outdoor unit.
1.2 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 3 6 R A 1 N 8 S 7 1 2 E 3 0 0 0 0 P V 0 4 0
Digit Feature Value Description
1, 2 Product model CR CRV
3, 4,
5Cooling capacity 025/ 035/ 036/045/066 Nominal cooling capacity, kW
6 Air supply type
R
H
Horizontal airflow with baffle
Horizontal airflow without baffle
7 System type
A
P
Air-cooled, cooling-only model (reheat and humidification are optional)
Refrigerant pump cooling
8 Fan type 1 EC fan
9 Power supply N 380-415 V, 50/60 Hz, 3 Ph + N + PE
10 System configuration
8
L
Variable speed compressor, R410A refrigerant (single compressor single
circuit)
Single circuit, variable speed compressor, R410A refrigerant, single pump
11 Humidification
0
S
W
None
Electrode humidifier
Wet film humidifier
12 Display
S
7
Standard display
Global HMI 7-inch screen
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

Digit Feature Value Description
13 Reheat
0
1
None
Electric heater (single-stage)
14 Filtration
2
0
G4 (EU4) filter
G4 (EU4) filter + filter clog switch
15 Coil and valves E Standard DX air- cooled coil, electronic expansion valve (EEV)
16 Appearance 3 EG7021 (black)
17 Mains disconnect switch high voltage
options
0
A
T
None
Dual power supply (interlocking contactor)
Dual power supply (ATS)
18 Installation options
0
H
L
C
B
None, standard pipe, no low ambient kit
Reheat and humidification lockout
Air-cooled, long pipe > 30 m
Low ambient kit
Low ambient kit + long pipe
19 Monitoring
0
S
7
RS485 interface
SIC card
Unity card
20 Sensor 0 None
21 Packaging
P
C
Standard packaging
Packaging for ocean shipping
22 Special requirements
A
V
None
Condensate pump
23 Piping
0
1
Bottom piping
Top Piping
24 Order special identifier 4 CRV4
25 Order special identifier
0
1
2
Industry version - 1100 mm
Telecom version
Industry version - 1200 mm
1 Product Overview
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

1.3 Product Appearance
Figure 1.1 Product Appearance
1.4 Main Components
The indoor unit of CRV4 includes DC brushless compressor, evaporator, EEV, humidifier, EC fan, electric heater, sight glass,
filter dryer, and display screen.
Compressor
The DC brushless compressor features low vibration, low noise, and high reliability. It is connected with suction and
discharge pipes with threaded connectors. It is convenient and easy to replace.
Evaporator
The evaporator uses high-efficiency, finned tube heat exchanger. It has a larger windward area and a smaller pressure drop.
The flow path is specially optimized to improve the utilization rate of the heat exchanger and ensure that the supply air
temperature is uniform. The surface is hydrophilic. There are condensate drainage pans in the middle and bottom of the
evaporator.
EEV
The EEV monitors temperature and pressure signals to provide accurate regulation of the refrigerant flow.
Humidifier
The unit can be equipped with electrode humidifier or wet film humidifier. CR025, CR035, and CR045 are equipped with
electrode humidifier as standard configuration. CR035 and CR045 can be configured with wet film humidifier. CR036 and
CR066 are equipped with wet film humidifier as standard configuration and cannot be installed with electrode humidifier.
The electrode humidifier has a simple structure and is easy to disassemble and maintain. It has a short humidification time
and provides a large amount of humidification. The wet film humidifier is simple to control and has low water quality
requirements and low energy consumption.
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

Fan
EC fan provides high efficiency and saves energy and space. It is hot-swappable.
Electric Heater
PTC electric heater has fast heating speed and provides uniform heat. It is safe and reliable.
Sight Glass
Sight glass serves as the window of system circulation. Through it, you can observe the status of the refrigerant and detect
the water content of the system. When the water content exceeds the standard, the sight glass background color will
change.
Filter Drier
Filter drier can effectively remove the moisture present in the system, filter the impurities generated by the long-term
operation of the system, and ensure the normal operation of the system. It is connected to the air conditioner with threaded
connectors, making it easy to replace.
Display Screen
The unit is configured with 7-inch color screen or LCD screen. The user interface operation is simple. The multi-level
password protection 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 1,000 historical event records.
Remote Monitoring Software
The unit adopts the standard communication protocol (industry standard Modbus protocol) of the Ministry of Industry and
Information Technology of China. The unit communicates with the back end computer and is controlled by the back end
software via the RS485 interface.
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

2 Pre-installation Guidance
CRV4 is professional equipment and its installation is complicated. This section details the preparation for installation,
including the requirements for the machine room, preparing installation space and reserving maintenance space, the
operating and storage environment requirements, and unpacking and inspecting.
2.1 Equipment Room Requirements
The requirements for the equipment room are as follows:
•The equipment room requires moisture-proof and thermal insulation to ensure the normal operation of the unit.
•The equipment room should have good heat insulation and a closed moisture-proof layer. Moisture barriers to
ceilings and walls must be made of polyethylene film material or brushed with moisture-proof paint.
•Outdoor air entry may increase the load of system heating, cooling, humidification and dehumidification, so it is
necessary to minimize the outdoor air entering the room. It is recommended that the intake of outdoor air be
kept below 5% of the total amount of air circulating throughout the room.
•All doors and windows should be fully enclosed, and the gap should be as small as possible.
WARNING! The indoor unit of CRV4 is prohibited from use in open, harsh outdoor environments.
2.2 Installation Space Requirements
CRV4 is a full-featured air-cooled refrigeration unit. It is recommended to install it in a row of computer cabinets in a high
heat-density "hot aisle cold aisle" layout.
Maintenance Space Requirements
Reserve a maintenance space of 600 mm in front of and behind the air conditioner.
Figure 2.1 Maintenance Space Requirements (Unit: mm)
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

The minimum maintenance space requirements are listed in the table below.
Space Location CR025 CR035 CR036 CR045 CR066
Front 600 600 600 600 600
Rear 600 600 600 600 600
Note: The space is reserved for routine maintenance, such as replacing filter, fan, and humidifier
Table 2.1 Maintenance Space Requirements (Unit: mm)
NOTE: For special applications, consult Vertiv™.
2.3 Environmental Requirements
2.3.1 Operating Environment
The operating environment should meet the requirements of GB4798.3-2007.
Item Requirement
Ambient temperature
Indoor 18 °C to 40 °C, 20% to 60% RH
Outdoor
-20 °C to +45 °C. If a low ambient kit is configured, the lowest outdoor operation temperature
is -34 °C
Protection level (outdoor unit) IP20
Altitude <1000 m. Contact Vertiv™ if altitude is above 1000 m
Operation voltage range 380-400 V ± 15%, 50 / 60 Hz, 3 Ph + N + PE
Table 2.2 Operating Environment Requirements
2.3.2 Storage Environment
The storage environment should meet the requirements of GB4798.1-2005.
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
Table 2.3 Storage Environment Requirements
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2.4 Refrigerant Requirement
Inferior or counterfeit refrigerant can seriously damage the system. Please use a refrigerant certified by Vertiv™. The
refrigerant brand certified by Vertiv™ is Honeywell.
WARNING! Do not use inferior refrigerant which can seriously damage the system. Vertiv™ is not responsible
for any consequences caused by the use of inferior refrigerant.
2.5 Handling, Unpacking, and Inspecting the Unit
2.5.1 Transporting and Handling the Unit
It is recommended to use rail transportation or waterway transportation. If you choose road transportation, choose a road
with better conditions to prevent excessive bumps.
The unit is heavy. The weight is listed in Table 3.1 Indoor Unit Dimensions and Weight.. It is recommended to use the
mechanical equipment like electrical forklift to move the unit. When handling, move the unit to a place closest to the
installation site. If an electric forklift is used, insert the tines below the pallet as shown in the figure below. Mind the center of
gravity of the packaged unit to prevent tipping.
Figure 2.2 Transporting the Unit
When handling, the inclination angle of the unit should be kept in the range of 75 to 105 degrees.
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

Figure 2.3 Inclination Angle
2.5.2 Unpacking the Unit
The unit is surrounded with air column bags and stretch film. To unpack the unit:
1. Remove the stretch film and the top cover, and then remove the paper corner protector and air column bags.
Figure 2.4 Removing the Package
Item Description Item Description
1 Top cover 4 EPE on display screen
2 Removing the top cover 5 Paper corner protector
3Removing stretch film, paper corner protector, and air column bag
from the unit. Removing EPE from display screen 6 Air column bag
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

2. Remove the bottom pallet by removing the M8 screws with a 17 mm blank wrench, ratchet wrench, or socket.
When removing the bottom pallet, keep the cabinet moving smoothly and avoid clashing with and damaging
the product appearance and internal components.
Figure 2.5 Removing Screws from Pallet
Item Description
1 M8 hex head screw
2 M8 hex head screw
2.5.3 Inspecting the Unit
After unpacking, check that the accessories are complete according to the packing list and check that all the parts are not
damaged. If any parts are found to be missing or damaged, report to the carrier immediately. If hidden damage is found,
report to the carrier and Vertiv™ local office.
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3 Mechanical Installation
Proper installation is essential to achieve the design performance and maximize the life of the equipment. This section
introduces installation precautions, system layout, installation procedure, pipeline connection, removal of transport fasteners
and vibration absorbers, and inspection. During installation, follow regional and local mechanical and electrical installation
regulations.
3.1 Installation Precautions
•CRV4 indoor unit and outdoor unit are installed on the ground, in separate places. The indoor unit must be
installed on the ground of the equipment room or computer room, and the outdoor unit can be installed on the
ground of a room or an outdoor environment.
•Check that the installation environment meets the requirements (see Section 2.3.2 Storage Environment) and
that the building is modified for laying pipelines and installing ventilation ducts.
•Strictly follow the design drawings and leave room for daily maintenance.
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

3.2 System Installation Layout
3.2.1 System General Layout
Figure 3.1 System General Layout
Item Description Item Description
1 Condenser coil 13 Low pressure sensor
2 Oil trap (installing one oil trap at every 7.5 m vertical rise) 14 Schrader valve 3
3 Solenoid valve 15 Suction line
4 Ball valve 1 16 Variable speed compressor
5 Schrader valve 1 17 Discharge line
6 Filter drier 18 Discharge temperature sensor
7 Sight glass 19 High pressure sensor
8 EEV 20 Ball valve 2
9 Schrader valve 2 21 Check valve
10 Distribution board 22 Schrader valve 4
11 Evaporator coil 23 High pressure switch
12 Suction temperature sensor
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

NOTE: CR036/066 does not contain ball valves.
NOTE: indicates the pipeline provided by the manufacturer.
NOTE: indicates the pipes that are laid on site (completed by technicians).
NOTE: Oil trap is not provided by Vertiv™. It is recommended to install it to ensure normal operation and convenient
maintenance.
NOTE: Solenoid valve and check valve are required when the equivalent pipe length is larger than 30 m.
3.2.2 System Installation Diagram
CRV4 system installation diagram is shown in the figure below.
Figure 3.2 System Installation Diagram (Condenser Higher Than Compressor)
Item Description Item Description
1 Maximum height 30 m 8 Humidifier water inlet pipe
2 Outdoor unit (condenser) 9 Condensate drainage pipe
3 Liquid pipe, away from direct sunlight 10 Floor
4 Oil trap 11 Insulated layer
5 Gas pipe needs to be tilted 12 Gap needs to be sealed
6 Indoor unit 13 Maximum height 7.5 m
7 Raised floor
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual

Figure 3.3 System Installation Diagram (Condenser Lower Than Compressor)
Item Description Item Description
1 Outdoor unit (condenser) 5 Raised floor
2 Maximum height 8 m 6 Humidifier water inlet pipe
3 Gas pipe needs to be tilted 7 Condensate drainage pipe
4 Indoor unit 8 Liquid pipe needs to be tilted
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Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual