Vertiv Liebert CRV4 Series User Manual
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Vertiv Liebert CRV4 Series User Manual

Vertiv Liebert CRV4 Series User Manual

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

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  • Page 1 Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual (Original Instructions)
  • Page 2 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 it without the written permission of Vertiv is strictly prohibited.

  • Page 3: Table Of Contents

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual TABLE OF CONTENTS 1 Product Overview 1.1 Product Introduction 1.2 Model Nomenclature 1.3 Product Appearance 1.4 Main Components 2 Pre-installation Guidance 2.1 Equipment Room Requirements 2.2 Installation Space Requirements 2.3 Environmental Requirements 2.3.1 Operating Environment...
  • Page 4 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 4.1.1 Cables to Connect at Installation Site 4.1.2 Installation Precautions 4.2 Wiring for Indoor Unit 4.2.1 Indoor Unit Wiring Position 4.2.2 Connecting Power Supply Cable for Indoor Unit 4.2.3 Connecting the Control Cables 4.2.4 Connecting Extension Kit Solenoid Valve (Optional for On-site Installation)
  • Page 5 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 7.7.1 Instructions for Operating Electrode Humidifier 7.7.2 Replacing the Humidifier 7.8 Wet Film Humidifier Maintenance 7.8.1 Instructions for Operating Wet Film Humidifier 7.8.2 Replacing the Wet Film Humidifier 7.8.3 Maintaining Water Inlet Solenoid Valve Filter 7.9 Electric Heater Maintenance...
  • Page 6 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual This page intentionally left blank Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 7: Product Overview

    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.
  • Page 8 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Digit Feature Value Description None Reheat Electric heater (single-stage) G4 (EU4) filter Filtration G4 (EU4) filter + filter clog switch Coil and valves Standard DX air- cooled coil, electronic expansion valve (EEV)

  • Page 9: Product Appearance

    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.
  • Page 10 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 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.

  • Page 11: Pre-Installation Guidance

    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.

  • Page 12: Environmental Requirements

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual The minimum maintenance space requirements are listed in the table below. Table 2.1 Maintenance Space Requirements (Unit: mm) Space Location CR025 CR035 CR036 CR045 CR066 Front Rear Note: The space is reserved for routine maintenance, such as replacing filter, fan, and humidifier NOTE: For special applications, consult Vertiv™.

  • Page 13: Refrigerant Requirement

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 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.

  • Page 14: Unpacking The Unit

    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: Remove the stretch film and the top cover, and then remove the paper corner protector and air column bags.

  • Page 15: Inspecting The Unit

    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.
  • Page 16 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual This page intentionally left blank 2 Pre-installation Guidance Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 17: Mechanical Installation

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 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.

  • Page 18: System Installation Layout

    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 Condenser coil Low pressure sensor Oil trap (installing one oil trap at every 7.5 m vertical rise)

  • Page 19: System Installation Diagram

    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.
  • Page 20 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 Outdoor unit (condenser) Raised floor Maximum height 8 m Humidifier water inlet pipe Gas pipe needs to be tilted...

  • Page 21: Mechanical Parameters

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 3.2.3 Mechanical Parameters Indoor Unit Mechanical Parameters Figure 3.4 Indoor Unit Dimensions Table 3.1 Indoor Unit Dimensions and Weight Model W×D×H mm Unit Weight kg CR025RA1N8W712E30000PV040 300×1100×2000 (including leveling feet) CR025RA1N8W712E30000PV042 300×1200×2000 (including leveling feet)
  • Page 22 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Positioning of Bottom Plate Inlet and Outlet Access Figure 3.5 Positioning of Bottom Plate Inlet and Outlet Access (Unit: mm) 3 Mechanical Installation Proprietary and Confidential ©2023 Vertiv Group Corp.
  • Page 23 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Table 3.2 Bottom Plate Pipe Outlet Size (Unit: mm) Model CR025 CR035 CR045 CR036 CR066 Compressor air discharge pipe opening Ø16 Ø22 Ø22 Ø19 Ø22 Evaporator liquid inlet pipe opening Ø12.7...
  • Page 24 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Positioning of Top Plate Inlet and Outlet Access Figure 3.6 Positioning of Top Plate Inlet and Outlet Access (Unit: mm) 3 Mechanical Installation Proprietary and Confidential ©2023 Vertiv Group Corp.
  • Page 25 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Table 3.3 Top Plate Pipe Outlet Size (Unit: mm) Model CR025 CR035 CR045 CR036 CR066 Compressor air discharge pipe opening Ø16 Ø22 Ø22 Ø19 Ø22 Evaporator liquid inlet pipe opening Ø12.7...

  • Page 26: Installing The Indoor Unit

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 3.3 Installing the Indoor Unit 3.3.1 Leveling the Unit CRV4 is in-row air conditioner. At least one side of the unit is adjacent to a server cabinet. After installing the unit, you need to level it.

  • Page 27: Removing The Leveling Feet And Fixing The Unit

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 3.3.2 Removing the Leveling Feet and Fixing the Unit CAUTION: To avoid personal injury and damage to the unit, this operation should be performed by two installers. Remove the leveling feet.

  • Page 28: Baying The Unit

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 3.3.3 Baying the Unit Baying brackets are supplied as accessories with the unit. You can bay the unit with adjacent cabinets using the baying brackets. NOTE: Before baying the unit, level the cabinet by referring to Section 3.3.1 Leveling the Unit.

  • Page 29: Removing The Filter

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 3.4.1 Removing the Filter Remove the filters from the indoor unit before installing pipes on the unit. Open the rear door, pull the filter flap to remove the flap, and then remove the upper filter and lower filter.
  • Page 30 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Figure 3.12 Water Trap Item Description Item Description Filling water to the water trap Condensate pan Bracket Minimum 20 cm Water trap Minimum 10 cm NOTE: Do not cut the bracket of the water trap. Otherwise, the water drainage will be affected.
  • Page 31 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 3 Mechanical Installation Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 32: Connecting Electrode Humidifier Water Inlet Pipe

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 3.4.3 Connecting Electrode Humidifier Water Inlet Pipe To supply water to the humidifier from the bottom plate, route the hose (which is reserved inside the unit and has a threaded connector) out of the water inlet hole on the bottom plate, and connect the hose to your drainage system using the 1/2"-BSP connector.

  • Page 33: Connecting Wet Film Humidifier Water Inlet Pipe

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Figure 3.14 Bottom Piping for Electrode Humidifier Water Inlet Pipe 3.4.4 Connecting Wet Film Humidifier Water Inlet Pipe To supply water to the humidifier from the bottom plate, route the hose (reserved inside the unit) out of the water inlet hole on the bottom plate, and connect the hose to your drainage system.
  • Page 34 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual The connection must be sealed to prevent water leakage, and the main line pressure range should be 100 kPa to 700 kPa. Where the main pipe pressure may exceed 700 kPa, a pressure reducer should be installed. Where the main pipe pressure is less than 100 kPa, there should be a collection tank and a water pump system.

  • Page 35: Connecting Gas And Liquid Pipes Between Indoor And Outdoor Units

    Table 3.4 Recommended Size of the Pipe (Unit: mm), or consult Vertiv™. For the vertical height difference between the indoor and outdoor units, see Table 3.5 Vertical Height Difference Between the Indoor Unit and The Outdoor Unit.
  • Page 36 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Figure 3.16 Top Plate Connections 3 Mechanical Installation Proprietary and Confidential ©2023 Vertiv Group Corp.
  • Page 37 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Figure 3.17 Bottom Plate Connections for Refrigeration 3 Mechanical Installation Proprietary and Confidential ©2023 Vertiv Group Corp.
  • Page 38 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 3 Mechanical Installation Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 39: Adding Extension Kits (On-Site Installation)

    0.56 NOTE: An oil trap should be installed at every 7.5 m of vertical height. For more information, please consult Vertiv™. When installing extension kits on site, in order to prevent pipeline exposure, it is recommended that the check valve of the extension kit is installed on the engineering pipeline on the outside of the gas pipe, and that the solenoid valve body is installed on the outer engineering pipeline of the liquid pipe ball valve, that is, on the outside or bottom of the equipment.
  • Page 40 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Figure 3.18 Discharge Check Valve Mounting Direction Notice on Installing Solenoid Valve • For the unit with bottom piping, the solenoid valve can be installed near the floor and the ground under the indoor unit.
  • Page 41 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Figure 3.20 Connecting Solenoid Valve Cable Item Description Item Description Wire connection base Reinstalling the screw that was removed from the coil Removing the cap by switching the slot in the middle, connecting the wires, and reinstalling the cap •...

  • Page 42: Charging Refrigerant And Adding Lubricating Oil

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 3.4.7 Charging Refrigerant and Adding Lubricating Oil Charging Refrigerant The unit is charged in the factory with 2 bar nitrogen for shipping. Table 3.7 LSF Outdoor Unit Recommended Refrigerant Charge (Unit: kg)

  • Page 43: Removing Transportation Fastener And Vibration Absorber

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Adding Lubricating Oil Adding refrigerant will lead to the dilution of the lubricating oil in the system, affecting the lubrication and cooling effect of the oil. Therefore it is necessary to add lubricating oil.

  • Page 44: Inspection After Mechanical Installation

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual After installation of the unit, remove these fixing plates before commissioning, and install the bolts and gaskets in the reverse order of removal. Adjusting the Baffle Depending on where unit is installed on site, the baffle direction can be adjusted to the left or right. The baffle is composed of several pieces.

  • Page 45: Electrical Installation

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 4 Electrical Installation This section describes the electrical installation precautions, wiring of the indoor unit, and inspections. NOTE: The unit is professional equipment, used in industrial, commercial, or other professional occasions. It is not accessible to the general public.

  • Page 46: Wiring For Indoor Unit

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 4.2 Wiring for Indoor Unit 4.2.1 Indoor Unit Wiring Position Low-voltage components can be seen after opening the rear door of the unit. The labels of the components help distinguish them.

  • Page 47: Connecting Power Supply Cable For Indoor Unit

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 4.2.2 Connecting Power Supply Cable for Indoor Unit Figure 4.1 show the location of indoor unit power supply cable connection. Connect the L1, L2, L3, N, and PE to corresponding terminals of the field power supply. Reserve a certain margin of the inlet cable and fix it to the clips on the inner side of the unit.
  • Page 48 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual NOTE: The cable size should match local wiring rules Table 4.2 Full Load Current Value (Unit: A) With single-stage electric With single-stage electric FLA(A) Cooling-only model With electrode humidifier heater...

  • Page 49: Connecting The Control Cables

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 4.2.3 Connecting the Control Cables Figure 4.3 Terminal Block (Enlarged View) Terminal Description Terminal Description 51, 24 Water underfloor sensor 61, 62 CAN communication 37, 38 Remote power on/off 63, 64...
  • Page 50 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual SIC Card SIC card is optional. If it is selected for the unit, connect the A, B, GND, and 12 terminals of the SIC card to the A2, B2, GND, and 12V terminals of the terminal block respectively.

  • Page 51: Connecting Extension Kit Solenoid Valve (Optional For On-Site Installation)

    For details on terminal number, see Appendix A Circuit Diagram. 4.3 Inspection After Electrical Installation Check against the following table after completing electrical installation. WARNING! Do not power on the unit before professional personnel authorized by Vertiv™ has completed the inspection. 4 Electrical Installation...
  • Page 52 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Table 4.4 Electrical Inspection Item Result The supply voltage is the same as the rated voltage on the unit nameplate There is no open circuit or short circuit in the electrical circuit of the system The power and grounding cables to the disconnect switch, indoor unit, and outdoor unit are connected The circuit breaker or fuse is rated correctly (please refer to the current values in Table 4.1 Main Circuit Breaker Type for the appropriate circuit...

  • Page 53: Commissioning The Unit

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 5 Commissioning the Unit This section introduces the system start-up commissioning, including the position of the circuit breaker and the commissioning procedures. 5.1 Position of Circuit Breaker Position of Circuit Breaker below shows the position of the circuit breaker. The actual position varies with unit models.

  • Page 54: Commissioning Before Start-Up

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 5.2 Commissioning Before Start-up 5.2.1 Preparation for Commissioning Mechanical Part • All valves in the refrigerant circuit are opened in accordance with the instruction labels. • A pressure leak test is performed for the refrigeration line system and the test result is qualified.

  • Page 55: Inspection After Commissioning

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual a. Charge the unit statically (before starting up the unit): After the vacuum inspection is completed, charge the unit quickly and statically with an appropriate amount of liquid refrigerant (normally, till the pressure in the tank is balanced with the system pressure).
  • Page 56 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual This page intentionally left blank 5 Commissioning the Unit Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 57: Display Screen Operation

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 6 Display Screen Operation This section describes the appearance, features, control interface, and menu structure of the display screen. 6.1 Features The micro-controller has the following features: • Monitors and displays the operation status of the air conditioner to keep the environment within the set range.

  • Page 58: Interface

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual The indicator is located under the screen. It has four colors and their indication is described in the table below. Table 6.1 Indicator Color Description Indicator Color Description Blue Display is starting...
  • Page 59 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Table 6.2 Main Interface Description Item Name Description Home Tap this button to enter the home page and view the main data and status of the system button Menu Tap this button to display the main menu page, through which you can access each submenu...

  • Page 60: Control Mode

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 6.3.2 Control Mode The main interface is divided into three read-only states: • Temperature control mode and humidity control mode • Current control mode temperature value and theoretical air supply humidity value •...

  • Page 61: Password Interface

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Figure 6.4 Unit Status Color Table 6.4 Unit Status Color Description Color System state description The power-on status sensor data is not within the normal range or is an invalid value...

  • Page 62: Menu Structure

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual The password has three levels. Table 6.5 Password Level Password Initial User Note level password Browse all menu information and set only temperature and humidity setpoints. Cannot set or Level 1...

  • Page 63: Operating Status

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Table 6.6 Menu Description Menu item Description Home Displays operating status, operating data, alarm data, and sensor data Operational Displays temperature and humidity information, External Static Pressure (ESP) information, switch status, power information,...
  • Page 64 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Temperature and Humidity Information You can view the temperature and humidity parameters of the unit in real time. This information includes return air temperature and humidity, supply air temperature, remote temperature and other information. Press the rightmost scroll bar to scroll up or down the query.
  • Page 65 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Switch Status You can view the disconnection or closing status of switches such as high-voltage switches, remote shutdown switches, floor overflow switches, and electrical heating fault switches. Figure 6.9 Switch Status Power Information You can view three-phase voltage and frequency.

  • Page 66: Alarm Information

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Teamwork Information You can view the status of the teamwork message. Figure 6.11 Teamwork Information 6.4.3 Alarm Information Select alarm information under the main menu to view current alarms, historical alarms, and compressor driver alarms.
  • Page 67 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual NOTE: The most recent alarm number is the smallest number. When multiple alarms occur, press the rightmost scroll bar to scroll up or down the query. NOTE: The current alarm record is automatically cleared when the system is powered down.
  • Page 68 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Compressor Driver Alarm You can view the specific code of the compressor driver alarm. Figure 6.14 Compressor Driver Alarm 6 Display Screen Operation Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 69: Temperature And Humidity Setting

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 6.4.4 Temperature and Humidity Setting Select temperature and humidity settings under the main menu to view temperature settings and humidity settings. Temperature Setting You can set values for return air temperature, remote temperature, supply air temperature , and temperature difference.

  • Page 70: Parameter Setting

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 6.4.5 Parameter Setting Select parameter settings under the main menu to view alarm parameters, alarm properties, system settings, compressor settings, indoor fan settings, ESP settings, communication settings, teamwork settings, time settings, display settings, parameter recovery, password settings, and data logging settings.
  • Page 71 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Alarm Attribute You can set enable or disable for the properties of the alarm such as the supply air high temperature alarm, supply air low temperature alarm, return air high temperature alarm, and return air high humidity alarm.
  • Page 72 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Compressor Setting You can set the compressor control mode and the compressor proportional band. Figure 6.20 Compressor Setting 6 Display Screen Operation Proprietary and Confidential ©2023 Vertiv Group Corp.
  • Page 73 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Indoor Fan Setting You can set the indoor fan control mode, indoor fan proportional band, the minimum speed, the maximum speed, and the rated speed of the indoor fan. Figure 6.21 Indoor Fan Setting ESP Setting Figure 6.22 ESP Setting...
  • Page 74 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Communication Setting Figure 6.23 Communication Setting Teamwork Setting Figure 6.24 Teamwork Setting 6 Display Screen Operation Proprietary and Confidential ©2023 Vertiv Group Corp.
  • Page 75 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Time Setting Figure 6.25 Time Setting Display Settings Figure 6.26 Display Settings 6 Display Screen Operation Proprietary and Confidential ©2023 Vertiv Group Corp.
  • Page 76 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Parameter Reset Figure 6.27 Parameter Reset Password Setting Figure 6.28 Password Setting 6 Display Screen Operation Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 77: Temperature And Humidity Curve

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Data Record Setting Figure 6.29 Data Record Setting 6.4.6 Temperature and Humidity Curve Select Temperature and Humidity Curve under the main menu to view the curve of return air temperature, return air humidity, supply air temperature, and average air supply humidity of 0 to 48 hours.

  • Page 78: Version Information

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 6.4.7 Version Information You can see the hardware and software version numbers. Figure 6.31 Version Information 6 Display Screen Operation Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 79: Maintenance

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 7 Maintenance Regular system maintenance is essential to ensure product reliability and effectiveness. This section describes routine maintenance inspection, system diagnostic test, and the maintenance of filters, fan assemblies, electrode humidifiers, electric heater, refrigeration system, and drainage system.

  • Page 80: Routine Maintenance Inspection (Semi-Annually)

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Table 7.1 Routine Maintenance Inspection (Monthly) (continued) Item Description Result Check the operation of the reheating system components Heating system Check for corrosion of the components Check the water tray for foreign objects...

  • Page 81: Self-Diagnostic Test

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Table 7.2 Routine Maintenance Inspection (Semi-annually) (continued) Item Description Note Check the fuse and leave it open Inspect and tighten the circuit connector Electric control system Check the control program...

  • Page 82: Control System Maintenance

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 7.4.2 Control System Maintenance Visual inspect the control part, perform simple function test, and handle appropriately as follows: • Check the appearance of the transformer and detect the output voltage (including indoor unit and outdoor condenser).

  • Page 83: Water Leak Detection Sensor

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 7.4.3 Water Leak Detection Sensor Install the water leak detection sensor and confirm the alarm information through the controller. The recommended installation location is shown in the figure below. Place the sensor away from the humid water trap or floor drain. Place it 2 to 2.5 meters away from the unit.

  • Page 84: Electrode Humidifier Maintenance

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Special attention needs to be paid to whether the fan assembly and the wind guide are firmly installed and whether the fan blades may rub against nearby sheet metal when the blades rotate. Eliminate any factors that cause airflow channel blockage to avoid the harm of air volume reduction to the refrigeration system and other system components.

  • Page 85: Instructions For Operating Electrode Humidifier

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 7.7.1 Instructions for Operating Electrode Humidifier Humidifier components include: humidifier bracket (including water pressure components such as inlet solenoid valves and drainage solenoid valves), humidifier tank, humidifier control board CPY (located in a metal box opposite the humidifier), power frequency transformer, high frequency transformer, contactor, electromagnetic relay, relay socket, humidification inlet pipe, humidification drain, humidification steam pipe, etc.

  • Page 86: Replacing The Humidifier

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Figure 7.4 Humidifier Control Board Item Description Item Description Drainage pump startup 24 Vac input Electrode humidifier contact point CPY manipulator connection Water outlet solenoid valve tLAN network connection Water inlet solenoid valve...
  • Page 87 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Humidifier is a consumable component that do not require regular cleaning. If the humidifier continues to feed water, or if the input voltage of the humidifier electrode is normal, but the water cannot boil, it indicates that the humidifier has reached its service life and needs to be replaced.

  • Page 88: Wet Film Humidifier Maintenance

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 7.8 Wet Film Humidifier Maintenance 7.8.1 Instructions for Operating Wet Film Humidifier The humidifier includes: humidifier bracket, wet film assembly, humidifier inlet solenoid valve, and humidifier inlet pipe. 7.8.2 Replacing the Wet Film Humidifier Replace the wet film humidifier on a monthly basis (the cleaning cycle varies with water quality and humidifier running time).

  • Page 89: Maintaining Water Inlet Solenoid Valve Filter

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Figure 7.8 Replacing Wet Film Assembly (CR066) Item Description Loosening the screw and removing the limit plate Pulling outward the wet film assembly to remove it 7.8.3 Maintaining Water Inlet Solenoid Valve Filter...

  • Page 90: Electric Heater Maintenance

    NOTE: If the line is not turned on, it is necessary to remove the electric heater to further check whether the fuse is disconnected, whether the thermostat is damaged, and whether the PTC electric heating is damaged. NOTE: If you need to replace the electric heater, please contact the maintenance staff of Vertiv™. Figure 7.10 PTC Electric Heater...

  • Page 91: Suction Pressure

    "liquid shock" and cause damage to the compressor. NOTE: Contact Vertiv™ for adjusting EEV. Users are not recommended to adjust the EEV by themselves. 7.10.4 Air-cooled Condenser When air flow in the outdoor unit is obstructed, clean the condenser with compressed air or fin cleaner (weak alkaline) to remove dust debris that hinders air flow.
  • Page 92 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Maintain and inspect the compressor for abnormal operation, rather than replacing the compressor after the failure. The unit adopts DC brushless compressor. Any maintenance operation must be performed strictly in accordance with the correct procedures.

  • Page 93: Drainage System Maintenance

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 7. Turn on the power supply and run the unit. Check that the refrigeration function is operating properly. Refer to the normal refrigeration cycle suction and discharge pressure range, and dynamically replenish a certain amount of refrigerant if necessary.
  • Page 94 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Figure 7.12 Water Pan Filter Screen Item Description Item Description Water pan filter screen Outlook view Water pan drainage hole Water pan filter screen Steps for replacing condensate pump are as follows: Cut off the power supply of the whole unit.
  • Page 95 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Pump filter screen: Regularly check the filter to ensure that there is no large piece of scale and debris. Regularly check and clean the filter screen of the pump to prevent blockage.
  • Page 96 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual This page intentionally left blank 7 Maintenance Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 97: Troubleshooting

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 8 Troubleshooting This section describes fault diagnosis and processing. Based on the content in this section, you can refer to the alarm information for fault diagnosis and handling. WARNING! Some circuits have fatal high voltages. Only professional technicians are allowed to operate the unit.

  • Page 98: Heating System Fault Diagnosis And Handling

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual 8.2 Heating System Fault Diagnosis and Handling Table 8.2 Heating System Fault Diagnosis and Handling Symptom Possible cause Check item or handling method There is no heating Check the status of the micro-processor controller to see if there is a need for heating...
  • Page 99 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Table 8.3 Refrigeration System Fault Diagnosis and Handling (continued) Symptom Possible cause Check item or handling method The condenser is dirty Clean the condenser High voltage protection The condensing equipment is not functioning...
  • Page 100 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual This page intentionally left blank 8 Troubleshooting Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 101: Appendix A: Display Screen Menu Structure

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Appendix A: Display Screen Menu Structure Level 1 Menu Level 2 Menu Parameter Theo Supply Hum, Current Supply Hum, Supply Temp Avg, Supply Temp1, Supply Temp2, Supply Temp3, Supply Hum1,...
  • Page 102 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Level 1 Menu Level 2 Menu Parameter Sup High Temp Alarm SP, Sup Low Temp Alarm SP, Rtn High Temp Alarm SP, Rtn Low Temp Alarm SP, Rtn High Hum...

  • Page 103: Appendix B: Alarm

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Appendix B: Alarm High Pressure Alarm Smoke Alarm Remote Hum Sensor7 Failure Power Undervoltage Low Pressure Alarm Fire Alarm Remote Hum Sensor8 Failure Power Freq Offset Discharge High Temp Alarm...
  • Page 104 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Humidifier Failure Remote Hum Sensor4 Failure Power Loss Cond WOF Alarm Remote Hum Sensor5 Failure Power Phase Loss Heater Failure Remote Hum Sensor6 Failure Power Overvoltage Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 105: Appendix C: Driver Alarm Code

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Appendix C: Driver Alarm Code Serial Compressor Driver Code Description Generation Conditions Number Alarm Code Hardware failure Hardware problems detected during initialization The instantaneous current value exceeds the overcurrent point during...

  • Page 106: Appendix D: Maintenance Inspection List

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Appendix D: Maintenance Inspection List D.1 Maintenance Inspection List (Monthly) Date: ________________________ Inspector:_______________________ Device model: ________________ Serial number:___________________ Refrigeration circulation system 1. Check the suction pressure and suction superheat Filter 2.
  • Page 107 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual D.2 Maintenance Inspection List (Semi-annual) Date: ________________________ Inspector:_______________________ Device model: ________________ Serial number:___________________ Refrigeration circulation system 1. Check the suction pressure and suction superheat 2. Check the discharge pressure and condensation supercooling Filter 3.

  • Page 108: Appendix E: Hazardous Substances

    2006 Vertiv™ is committed to the design and manufacture of environment-friendly products. It will reduce and eventually eliminate toxic and hazardous substances in the products through unremitting efforts in research. However, limited by the current technical level, the following parts still contain hazardous substance due to the lack of reliable substitute or mature solution.

  • Page 109: Appendix F: Circuit Diagram

    Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual Appendix F: Circuit Diagram • CR025 Circuit Diagram • CR035 Circuit Diagram • CR045 Circuit Diagram • CR036 Circuit Diagram • CR066 Circuit Diagram Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 110: Appendix F1 Cr025 Circuit Diagram

    Ethernet or CAN wiring/以太网或CAN线路 BK-Black/黑色 P-Purple/紫色 Factory supplied 24 volt wiring/出厂24V线路 BL-Blue/蓝色 R-Red/红色 Device own line/器件自带线 BR-Brown/棕色 YE-Yellow/黄色 Inline quick disconnect/线上快速对插端子 WH-White/白色 GR-Grey/灰色 Terminal block connector/线缆端子 Y/GN-Yellow green/黄绿色 A1 B1 Naked crimping connector/裸压端子 O-Orange/橙色 Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 111: Appendix F2 Cr035 Circuit Diagram

    Ethernet or CAN wiring/以太网或CAN线路 BK-Black/黑色 P-Purple/紫色 Factory supplied 24 volt wiring/出厂24V线路 BL-Blue/蓝色 R-Red/红色 Device own line/器件自带线 BR-Brown/棕色 YE-Yellow/黄色 Inline quick disconnect/线上快速对插端子 WH-White/白色 GR-Grey/灰色 Terminal block connector/线缆端子 Y/GN-Yellow green/黄绿色 A1 B1 Naked crimping connector/裸压端子 O-Orange/橙色 Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 112: Appendix F3 Cr045 Circuit Diagram

    配线色标/Wire color code： Ethernet or CAN wiring/以太网或CAN线路 BK-Black/黑色 P-Purple/紫色 Factory supplied 24 volt wiring/出厂24V线路 BL-Blue/蓝色 R-Red/红色 Device own line/器件自带线 BR-Brown/棕色 YE-Yellow/黄色 Inline quick disconnect/线上快速对插端子 WH-White/白色 GR-Grey/灰色 Terminal block connector/线缆端子 Y/GN-Yellow green/黄绿色 Naked crimping connector/裸压端子 O-Orange/橙色 Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 113: Appendix F4 Cr036 Circuit Diagram

    配线色标/Wire color code： Ethernet or CAN wiring/以太网或CAN线路 BK-Black/黑色 Factory supplied 24 volt wiring/出厂24V线路 BL-Blue/蓝色 Device own line/器件自带线 BR-Brown/棕色 Inline quick disconnect/线上快速对插端子 WH-White/白色 Terminal block connector/线缆端子 Y/GN-Yellow green/黄绿色 Naked crimping connector/裸压端子 O-Orange/橙色 P-Purple/紫色 R-Red/红色 YE-Yellow/黄色 GR-Grey/灰色 Proprietary and Confidential ©2023 Vertiv Group Corp.

  • Page 114: Appendix F5 Cr066 Circuit Diagram

    配线色标/Wire color code： Ethernet or CAN wiring/以太网或CAN线路 BK-Black/黑色 P-Purple/紫色 Factory supplied 24 volt wiring/出厂24V线路 BL-Blue/蓝色 R-Red/红色 Device own line/器件自带线 BR-Brown/棕色 YE-Yellow/黄色 Inline quick disconnect/线上快速对插端子 WH-White/白色 GR-Grey/灰色 Terminal block connector/线缆端子 Y/GN-Yellow green/黄绿色 Naked crimping connector/裸压端子 O-Orange/橙色 Proprietary and Confidential ©2023 Vertiv Group Corp.
  • Page 115 Vertiv™ Liebert® CRV4 Series Air-cooled Precision Air Conditioners User Manual...
  • Page 116 © 2023 Vertiv Group Corp. All rights reserved. Vertiv™ and the Vertiv logo are trademarks or registered trademarks 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 here, Vertiv Group Corp.

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