Emerson Liebert CRV User Manual (English)

Questions and Answers:

T
Todd WalterAug 22, 2025
How to fix high rack temperature in Emerson Liebert CRV Air Conditioner?
- S
  Sheila BrennanAug 22, 2025
  If the rack temperature is too high, it might be due to dirty filters. Try replacing them. For air-cooled units, ensure that remote condenser fans are running. Also, verify that remote temperature sensors are correctly positioned. Water/glycol units: Check cooling water supply and cooling water temperature. Verify unit positioning/room configuration, unit air baffles set-up, and cold aisle containment seals (if applicable). Consider reducing the rack heat load or adding cooling units if there is insufficient room-cooling capacity.
E
Eileen HayesAug 25, 2025
What to do if there's water on the floor around my Emerson Liebert CRV Air Conditioner?
- V
  Virginia LewisAug 25, 2025
  If you find water on the floor around the unit, start by adjusting the leveling feet to ensure the unit is properly leveled. If that doesn't solve the issue, remove any obstruction from the unit's condensate drain pipe. For chilled water and water/glycol units, check for leaks in the water circuit and repair them. Restore insulation integrity if the piping insulation is broken or damaged.
K
Kelly EdwardsAug 26, 2025
What to do if my Emerson Liebert CRV Air Conditioner's local display is not operational but the unit operates?
- M
  Meredith CaseAug 27, 2025
  If the local display is not operational but the unit continues to operate, first check the local display cable and connect it if it is disconnected. If the cable is damaged, replace it.
T
tthompsonAug 28, 2025
What to do if my Emerson Liebert CRV's local display is not operational and the unit does not operate?
- K
  Kelsey HartmanAug 28, 2025
  If the local display is not operational and the unit does not operate, ensure that the unit's electrical supply is on. Also, check that the unit's main switch is in the On position.
B
Bryan Meza MDAug 29, 2025
What to do if my Emerson Air Conditioner unit fan fails to start?
- D
  Daniel GarnerAug 30, 2025
  If the unit fan fails to start, confirm rear door switches are made. Confirm fan contactor is pulled in. Confirm line voltage is present at the fan.
B
Brian MartinezSep 1, 2025
What to do if there is water on the floor around Emerson Liebert CRV Air Conditioner unit?
- J
  Jacqueline AndersonSep 1, 2025
  If you find water on the floor around the unit, first, adjust the leveling feet to ensure the unit is properly leveled. Next, check the unit's condensate drain pipe for any clogs and remove any obstructions. If you have chilled water and water/glycol units, inspect the water circuit for leaks and repair them. Restore insulation integrity of the piping, if the piping insulation is broken or damaged.
F
freedSep 3, 2025
What to do if the local display is not operational and Emerson Liebert CRV unit does not operate?
- R
  Roberto BautistaSep 3, 2025
  If the local display isn't working and the unit isn't operating, ensure the unit's electrical supply is on. Also, check that the unit's main switch is in the On position.
A
April HillSep 5, 2025
Why is my Emerson Liebert CRV Air Conditioner's evaporator fan stuck at 100%?
- R
  Rachel SmithSep 5, 2025
  If the evaporator fans will not modulate from 100%, it could be due to a low pressure condition. Verify suction pressure in the service menus, diagnostic service icon with the compressor loaded to 100%. If the suction drops below 109 psi (7.5 bar), the fan speed will increase to help build suction. Verify suction transducer reading is correct compared with a manifold gauge. Also, check if the fan control is properly set.
M
Michael SandovalSep 7, 2025
What causes unsteady air delivery temperature in my Emerson Liebert CRV?
- K
  Katelyn SheppardSep 7, 2025
  Unsteady air delivery temperature can be caused by several factors. First, verify the correct positioning of temperature sensors. If the heat load distribution is unbalanced, redistribute rack heat load.
N
ngreenSep 9, 2025
What causes capacity reduction due to HP alarm (Comp Reduced by HP) on my Emerson Air Conditioner?
- H
  henrydelacruzSep 9, 2025
  Capacity reduction due to a High Pressure (HP) alarm can occur if the condensing pressure (head pressure) has exceeded 493 psig (34 bar). For air-cooled units, verify that remote condenser fans are running. Check accuracy of transducer by attaching a manifold gauge to discharge side of compressor. Compare gauge reading to what is shown in Service Menus, Diagnostic service mode. For water/glycol units, check cooling water supply and temperature.

Emerson Liebert CRV Specifications

General

Refrigerant	R410A
Compressor Type	Scroll
Frequency	50/60 Hz
Power Supply	208/230/400/460 VAC, 50/60 Hz
Control	Microprocessor-based
Dimensions (H x W x D)	Varies by model
Weight	Varies by model
Sound Pressure Level	Varies by model

Summary

Important Safety Instructions

Arc flash and electric shock hazard

Risk of injury or death from arc flash and electric shock.

High temperatures, extreme cold, and rotating fan blades

Warning about hazards from high temperatures, extreme cold, and fast-spinning fan blades.

High-pressure refrigerant discharge

Risk of injury or death from explosive discharge of high-pressure refrigerant.

Top-heavy unit falling over

Warning about potential tip-over causing equipment damage, injury, or death.

Internal system corrosion and frozen coolant fluid

Risk of equipment damage and leaks due to internal system corrosion or frozen coolant.

Understanding Liebert CRV Model Numbers

Unit Family and Depth

Defines the unit family (Liebert CRV) and its row-based depth.

System Type and Fan

Specifies the system type (Air Cooled, Water/Glycol, Chilled Water) and fan type.

Power Supply and Cooling System

Details the unit's power supply voltage and the cooling system configuration.

High-Voltage Options and Packaging

Describes high-voltage options, unit color, and packaging type (Domestic or Export).

Liebert IntelliSlot® Housing and Special Features

Details IntelliSlot housing options and special unit features.

Liebert CRV Component Identification

Top Electrical and Humidifier Connections

Identifies top electrical entrance and humidifier supply/drain connections.

Supply, Return, and Bottom Connections

Locates supply/return connections, bottom electrical entrance, and drain connections.

Evaporator Coil and Liebert iCOM®

Pinpoints the evaporator/CW coil and the Liebert iCOM control unit.

Liebert CRV System Overview

Product Description and SmartAisle™ Configuration

Details the CRV's function as a precision cooling unit and its role in SmartAisle™.

Inspection, Handling, and Unpacking Procedures

Equipment Inspection and Packing Material

Instructions for inspecting the unit upon arrival and handling packaging material.

Unit Handling and Moving

Guidelines for handling the unit, including center of gravity and weights.

Unpacking and Removing the Unit from Skid

Steps for unpacking the unit and safely removing it from the shipping skid.

Liebert CRV Installation Preparation

Adjusting Leveling Feet

Procedure for adjusting the unit's base supports to ensure it is level.

Piping and Fluid Connections

Fluid Connections and Drain Piping

Details on fluid connections, condensate drain piping, and gravity drains.

Refrigeration and Hydraulic Circuit Diagrams

Provides general arrangements for refrigeration and hydraulic circuits.

Leak Checking Procedures

Guidelines for leak checking unit fluid systems and field piping.

Air-Cooled Unit Refrigerant Connections

Refrigerant Piping Guidelines

Instructions for piping, including material, layout, and installation practices.

Liebert MC and Fin/Tube Condenser Selection

Guidance on selecting Liebert MC and Fin/Tube condensers for CRV units.

Vacuum and Refrigerant Charge Procedures

Details on evacuating air-cooled units and charging the system with refrigerant.

Calculating Refrigerant Charge Values

Methods for calculating correct refrigerant charge for MC condenser systems.

Water Connections for CRV Units

Water/Glycol Unit Connections

Details water and glycol connections for 600mm units, including glycol mixtures.

Chilled Water Unit Connections

Information on water connections for chilled water units, including circuit diagrams.

Electrical System Connections

Field Electrical Connection Descriptions

Details on standard and optional electrical field connections for 600mm and 300mm models.

Power Supply and Wiring Connections

Instructions for power supply cable connections and wiring, including remote/alarm signals.

Fan and Heater Protective Features

Describes protective features for electronically commutated fans and electrical heaters.

Liebert CRV Startup and Operation

Initial Startup Steps

Step-by-step guide for initial startup of the Liebert CRV unit.

Post-Startup Checks

Essential checks to perform after the system is operating under load.

Automatic Restart Configuration

How to configure the unit for automatic restart after a power interruption.

Adjusting Airflow Baffles

Instructions for adjusting airflow baffles for optimal cooling and rack alignment.

Liebert iCOM® Control System Operation

Control Interface and Navigation

Overview of the iCOM control interface, menus, and navigation methods.

Understanding User and Service Menus

Guide to accessing and using User, Service, and Advanced menus.

Liebert CRV Operation Modes

Explanation of cooling, fan speed, and humidification control modes.

Setpoints and Sensor Configuration

Details on setting parameters like temperature, humidity, and fan speed sensors.

Maintenance and Wellness Settings

Information on calculating unit wellness and setting maintenance parameters.

Diagnostics and Alarm Settings

Guides for diagnostics, service modes, and configuring alarm parameters.

Sensor Calibration Procedures

Steps for calibrating temperature and humidity sensors for accurate readings.

System and Network Setup

Configuration of network settings, unit names, and IP addresses for iCOM units.

Options Setup and Service Contact

Configuration of unit options, service contact information, and troubleshooting.

Liebert CRV Teamwork Mode Operation

Unit-to-Unit Network Wiring

Instructions for wiring units for U2U communication and network setup.

Liebert iCOM U2U Ethernet Network Configuration

Details on setting up the U2U Ethernet network for iCOM communication.

Teamwork Mode Definitions and Applications

Explains different teamwork modes (No Teamwork, Mode 1, 2, 3) and their applications.

Standby-Rotation and Cascade Functionality

Describes standby rotation, lead/lag, and cascade functions for unit coordination.

Remote Rack Sensor Installation and Wiring

DIP Switch Settings for 2T Sensors

Guide to setting DIP switches for 2T sensors to configure identities.

Terminating the Last 2T Sensor on the Network

Methods for terminating the last 2T sensor using plugs or jumpers.

CANbus and Ethernet Cable Wiring

Information on CANbus and Ethernet cable specifications and routing.

Sensor Location and Mounting

Guidelines for selecting sensor locations and mounting them on racks.

Remote Rack Sensor Operation and Setup

Configuring sensors for control or reference and setting up rack view.

Liebert CRV Unit Operation Modes

Cooling Modes (DX and CW)

Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.

Reheating, Dehumidification, and Humidification

Explains operation of optional heating, dehumidification, and humidification features.

Alarms and Events Monitoring

How to interpret and respond to alarms and events generated by the control system.

Calibration and Regulation After Startup

Thermostatic Expansion Valve (TEV) Adjustment

Procedure for checking and adjusting superheat settings on the TEV.

Calibrating Electrical Components

Steps for calibrating key electrical components like pressure transducers and switches.

Liebert CRV Maintenance Procedures

Safety Instructions for Maintenance

Essential safety precautions to follow before and during maintenance operations.

Water and Glycol System Maintenance

Guidelines for maintaining facility water and glycol quality in the coolant system.

Air Filter Inspection and Replacement

Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.

Condensate Drain and Pump System Maintenance

Procedures for checking and maintaining condensate drain lines and pumps.

Considerations for Unit Dismantling and F-Gas Regulation

Guidance on safe dismantling and compliance with F-Gas regulations.

Liebert CRV Troubleshooting Guide

Rack Temperature Issues

Common causes and corrective actions for high rack temperatures.

Evaporator Fan Modulation Problems

Troubleshooting steps when evaporator fans do not modulate correctly.

Capacity Reduction and Humidity Issues

Diagnosing capacity reduction and low/high humidity problems.

Fan Startup Failures and Water Issues

Troubleshooting fan start failures and water leaks around the unit.

Humidifier Operation and Maintenance

Humidifier Principal Operation

Explanation of how the humidifier operates and its principal functions.

Humidifier Water Supply and Startup

Guidelines for water supply, connection, and startup procedures.

Humidifier Troubleshooting and Cylinder Replacement

Common issues, troubleshooting steps, and cylinder replacement guidance.

Remote Rack Sensor Troubleshooting and Setup

DIP Switch Settings for 2T Sensors

Guide to setting DIP switches for 2T sensors to configure identities.

Terminating the Last 2T Sensor on the Network

Methods for terminating the last 2T sensor using plugs or jumpers.

CANbus and Ethernet Cable Wiring

Information on CANbus and Ethernet cable specifications and routing.

Sensor Location and Mounting

Guidelines for selecting sensor locations and mounting them on racks.

Remote Rack Sensor Operation and Setup

Configuring sensors for control or reference and setting up rack view.

Liebert CRV Unit Operation Modes

Cooling Modes (DX and CW)

Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.

Reheating, Dehumidification, and Humidification

Explains operation of optional heating, dehumidification, and humidification features.

Alarms and Events Monitoring

How to interpret and respond to alarms and events generated by the control system.

Calibration and Regulation After Startup

Thermostatic Expansion Valve (TEV) Adjustment

Procedure for checking and adjusting superheat settings on the TEV.

Calibrating Electrical Components

Steps for calibrating key electrical components like pressure transducers and switches.

Liebert CRV Maintenance Procedures

Safety Instructions for Maintenance

Essential safety precautions to follow before and during maintenance operations.

Water and Glycol System Maintenance

Guidelines for maintaining facility water and glycol quality in the coolant system.

Air Filter Inspection and Replacement

Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.

Condensate Drain and Pump System Maintenance

Procedures for checking and maintaining condensate drain lines and pumps.

Considerations for Unit Dismantling and F-Gas Regulation

Guidance on safe dismantling and compliance with F-Gas regulations.

Liebert CRV Troubleshooting Guide

Rack Temperature Issues

Common causes and corrective actions for high rack temperatures.

Evaporator Fan Modulation Problems

Troubleshooting steps when evaporator fans do not modulate correctly.

Capacity Reduction and Humidity Issues

Diagnosing capacity reduction and low/high humidity problems.

Fan Startup Failures and Water Issues

Troubleshooting fan start failures and water leaks around the unit.

Humidifier Operation and Maintenance

Humidifier Principal Operation

Explanation of how the humidifier operates and its principal functions.

Humidifier Water Supply and Startup

Guidelines for water supply, connection, and startup procedures.

Humidifier Troubleshooting and Cylinder Replacement

Common issues, troubleshooting steps, and cylinder replacement guidance.

Remote Rack Sensor Troubleshooting and Setup

DIP Switch Settings for 2T Sensors

Guide to setting DIP switches for 2T sensors to configure identities.

Terminating the Last 2T Sensor on the Network

Methods for terminating the last 2T sensor using plugs or jumpers.

CANbus and Ethernet Cable Wiring

Information on CANbus and Ethernet cable specifications and routing.

Sensor Location and Mounting

Guidelines for selecting sensor locations and mounting them on racks.

Remote Rack Sensor Operation and Setup

Configuring sensors for control or reference and setting up rack view.

Liebert CRV Unit Operation Modes

Cooling Modes (DX and CW)

Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.

Reheating, Dehumidification, and Humidification

Explains operation of optional heating, dehumidification, and humidification features.

Alarms and Events Monitoring

How to interpret and respond to alarms and events generated by the control system.

Calibration and Regulation After Startup

Thermostatic Expansion Valve (TEV) Adjustment

Procedure for checking and adjusting superheat settings on the TEV.

Calibrating Electrical Components

Steps for calibrating key electrical components like pressure transducers and switches.

Liebert CRV Maintenance Procedures

Safety Instructions for Maintenance

Essential safety precautions to follow before and during maintenance operations.

Water and Glycol System Maintenance

Guidelines for maintaining facility water and glycol quality in the coolant system.

Air Filter Inspection and Replacement

Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.

Condensate Drain and Pump System Maintenance

Procedures for checking and maintaining condensate drain lines and pumps.

Considerations for Unit Dismantling and F-Gas Regulation

Guidance on safe dismantling and compliance with F-Gas regulations.

Liebert CRV Troubleshooting Guide

Rack Temperature Issues

Common causes and corrective actions for high rack temperatures.

Evaporator Fan Modulation Problems

Troubleshooting steps when evaporator fans do not modulate correctly.

Capacity Reduction and Humidity Issues

Diagnosing capacity reduction and low/high humidity problems.

Fan Startup Failures and Water Issues

Troubleshooting fan start failures and water leaks around the unit.

Humidifier Operation and Maintenance

Humidifier Principal Operation

Explanation of how the humidifier operates and its principal functions.

Humidifier Water Supply and Startup

Guidelines for water supply, connection, and startup procedures.

Humidifier Troubleshooting and Cylinder Replacement

Common issues, troubleshooting steps, and cylinder replacement guidance.

Remote Rack Sensor Troubleshooting and Setup

DIP Switch Settings for 2T Sensors

Guide to setting DIP switches for 2T sensors to configure identities.

Terminating the Last 2T Sensor on the Network

Methods for terminating the last 2T sensor using plugs or jumpers.

CANbus and Ethernet Cable Wiring

Information on CANbus and Ethernet cable specifications and routing.

Sensor Location and Mounting

Guidelines for selecting sensor locations and mounting them on racks.

Remote Rack Sensor Operation and Setup

Configuring sensors for control or reference and setting up rack view.

Liebert CRV Unit Operation Modes

Cooling Modes (DX and CW)

Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.

Reheating, Dehumidification, and Humidification

Explains operation of optional heating, dehumidification, and humidification features.

Alarms and Events Monitoring

How to interpret and respond to alarms and events generated by the control system.

Calibration and Regulation After Startup

Thermostatic Expansion Valve (TEV) Adjustment

Procedure for checking and adjusting superheat settings on the TEV.

Calibrating Electrical Components

Steps for calibrating key electrical components like pressure transducers and switches.

Liebert CRV Maintenance Procedures

Safety Instructions for Maintenance

Essential safety precautions to follow before and during maintenance operations.

Water and Glycol System Maintenance

Guidelines for maintaining facility water and glycol quality in the coolant system.

Air Filter Inspection and Replacement

Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.

Condensate Drain and Pump System Maintenance

Procedures for checking and maintaining condensate drain lines and pumps.

Considerations for Unit Dismantling and F-Gas Regulation

Guidance on safe dismantling and compliance with F-Gas regulations.

Liebert CRV Troubleshooting Guide

Rack Temperature Issues

Common causes and corrective actions for high rack temperatures.

Evaporator Fan Modulation Problems

Troubleshooting steps when evaporator fans do not modulate correctly.

Capacity Reduction and Humidity Issues

Diagnosing capacity reduction and low/high humidity problems.

Fan Startup Failures and Water Issues

Troubleshooting fan start failures and water leaks around the unit.

Humidifier Operation and Maintenance

Humidifier Principal Operation

Explanation of how the humidifier operates and its principal functions.

Humidifier Water Supply and Startup

Guidelines for water supply, connection, and startup procedures.

Humidifier Troubleshooting and Cylinder Replacement

Common issues, troubleshooting steps, and cylinder replacement guidance.

Remote Rack Sensor Troubleshooting and Setup

DIP Switch Settings for 2T Sensors

Guide to setting DIP switches for 2T sensors to configure identities.

Terminating the Last 2T Sensor on the Network

Methods for terminating the last 2T sensor using plugs or jumpers.

CANbus and Ethernet Cable Wiring

Information on CANbus and Ethernet cable specifications and routing.

Sensor Location and Mounting

Guidelines for selecting sensor locations and mounting them on racks.

Remote Rack Sensor Operation and Setup

Configuring sensors for control or reference and setting up rack view.

Liebert CRV Unit Operation Modes

Cooling Modes (DX and CW)

Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.

Reheating, Dehumidification, and Humidification

Explains operation of optional heating, dehumidification, and humidification features.

Alarms and Events Monitoring

How to interpret and respond to alarms and events generated by the control system.

Calibration and Regulation After Startup

Thermostatic Expansion Valve (TEV) Adjustment

Procedure for checking and adjusting superheat settings on the TEV.

Calibrating Electrical Components

Steps for calibrating key electrical components like pressure transducers and switches.

Liebert CRV Maintenance Procedures

Safety Instructions for Maintenance

Essential safety precautions to follow before and during maintenance operations.

Water and Glycol System Maintenance

Guidelines for maintaining facility water and glycol quality in the coolant system.

Air Filter Inspection and Replacement

Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.

Condensate Drain and Pump System Maintenance

Procedures for checking and maintaining condensate drain lines and pumps.

Considerations for Unit Dismantling and F-Gas Regulation

Guidance on safe dismantling and compliance with F-Gas regulations.

Liebert CRV Troubleshooting Guide

Rack Temperature Issues

Common causes and corrective actions for high rack temperatures.

Evaporator Fan Modulation Problems

Troubleshooting steps when evaporator fans do not modulate correctly.

Capacity Reduction and Humidity Issues

Diagnosing capacity reduction and low/high humidity problems.

Fan Startup Failures and Water Issues

Troubleshooting fan start failures and water leaks around the unit.

Humidifier Operation and Maintenance

Humidifier Principal Operation

Explanation of how the humidifier operates and its principal functions.

Humidifier Water Supply and Startup

Guidelines for water supply, connection, and startup procedures.

Humidifier Troubleshooting and Cylinder Replacement

Common issues, troubleshooting steps, and cylinder replacement guidance.

Remote Rack Sensor Troubleshooting and Setup

DIP Switch Settings for 2T Sensors

Guide to setting DIP switches for 2T sensors to configure identities.

Terminating the Last 2T Sensor on the Network

Methods for terminating the last 2T sensor using plugs or jumpers.

CANbus and Ethernet Cable Wiring

Information on CANbus and Ethernet cable specifications and routing.

Sensor Location and Mounting

Guidelines for selecting sensor locations and mounting them on racks.

Remote Rack Sensor Operation and Setup

Configuring sensors for control or reference and setting up rack view.

Liebert CRV Unit Operation Modes

Cooling Modes (DX and CW)

Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.

Reheating, Dehumidification, and Humidification

Explains operation of optional heating, dehumidification, and humidification features.

Alarms and Events Monitoring

How to interpret and respond to alarms and events generated by the control system.

Calibration and Regulation After Startup

Thermostatic Expansion Valve (TEV) Adjustment

Procedure for checking and adjusting superheat settings on the TEV.

Calibrating Electrical Components

Steps for calibrating key electrical components like pressure transducers and switches.

Liebert CRV Maintenance Procedures

Safety Instructions for Maintenance

Essential safety precautions to follow before and during maintenance operations.

Water and Glycol System Maintenance

Guidelines for maintaining facility water and glycol quality in the coolant system.

Air Filter Inspection and Replacement

Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.

Condensate Drain and Pump System Maintenance

Procedures for checking and maintaining condensate drain lines and pumps.

Considerations for Unit Dismantling and F-Gas Regulation

Guidance on safe dismantling and compliance with F-Gas regulations.

Liebert CRV Troubleshooting Guide

Rack Temperature Issues

Common causes and corrective actions for high rack temperatures.

Evaporator Fan Modulation Problems

Troubleshooting steps when evaporator fans do not modulate correctly.

Capacity Reduction and Humidity Issues

Diagnosing capacity reduction and low/high humidity problems.

Fan Startup Failures and Water Issues

Troubleshooting fan start failures and water leaks around the unit.

Humidifier Operation and Maintenance

Humidifier Principal Operation

Explanation of how the humidifier operates and its principal functions.

Humidifier Water Supply and Startup

Guidelines for water supply, connection, and startup procedures.

Humidifier Troubleshooting and Cylinder Replacement

Common issues, troubleshooting steps, and cylinder replacement guidance.

Remote Rack Sensor Troubleshooting and Setup

DIP Switch Settings for 2T Sensors

Guide to setting DIP switches for 2T sensors to configure identities.

Terminating the Last 2T Sensor on the Network

Methods for terminating the last 2T sensor using plugs or jumpers.

CANbus and Ethernet Cable Wiring

Information on CANbus and Ethernet cable specifications and routing.

Sensor Location and Mounting

Guidelines for selecting sensor locations and mounting them on racks.

Remote Rack Sensor Operation and Setup

Configuring sensors for control or reference and setting up rack view.

Liebert CRV Unit Operation Modes

Cooling Modes (DX and CW)

Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.

Reheating, Dehumidification, and Humidification

Explains operation of optional heating, dehumidification, and humidification features.

Alarms and Events Monitoring

How to interpret and respond to alarms and events generated by the control system.

Calibration and Regulation After Startup

Thermostatic Expansion Valve (TEV) Adjustment

Procedure for checking and adjusting superheat settings on the TEV.

Calibrating Electrical Components

Steps for calibrating key electrical components like pressure transducers and switches.

Liebert CRV Maintenance Procedures

Safety Instructions for Maintenance

Essential safety precautions to follow before and during maintenance operations.

Water and Glycol System Maintenance

Guidelines for maintaining facility water and glycol quality in the coolant system.

Air Filter Inspection and Replacement

Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.

Condensate Drain and Pump System Maintenance

Procedures for checking and maintaining condensate drain lines and pumps.

Considerations for Unit Dismantling and F-Gas Regulation

Guidance on safe dismantling and compliance with F-Gas regulations.

Liebert CRV Troubleshooting Guide

Rack Temperature Issues

Common causes and corrective actions for high rack temperatures.

Evaporator Fan Modulation Problems

Troubleshooting steps when evaporator fans do not modulate correctly.

Capacity Reduction and Humidity Issues

Diagnosing capacity reduction and low/high humidity problems.

Fan Startup Failures and Water Issues

Troubleshooting fan start failures and water leaks around the unit.

Humidifier Operation and Maintenance

Humidifier Principal Operation

Explanation of how the humidifier operates and its principal functions.

Humidifier Water Supply and Startup

Guidelines for water supply, connection, and startup procedures.

Humidifier Troubleshooting and Cylinder Replacement

Common issues, troubleshooting steps, and cylinder replacement guidance.

Remote Rack Sensor Troubleshooting and Setup

DIP Switch Settings for 2T Sensors

Guide to setting DIP switches for 2T sensors to configure identities.

Terminating the Last 2T Sensor on the Network

Methods for terminating the last 2T sensor using plugs or jumpers.

CANbus and Ethernet Cable Wiring

Information on CANbus and Ethernet cable specifications and routing.

Sensor Location and Mounting

Guidelines for selecting sensor locations and mounting them on racks.

Remote Rack Sensor Operation and Setup

Configuring sensors for control or reference and setting up rack view.

Liebert CRV Unit Operation Modes

Cooling Modes (DX and CW)

Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.

Reheating, Dehumidification, and Humidification

Explains operation of optional heating, dehumidification, and humidification features.

Alarms and Events Monitoring

How to interpret and respond to alarms and events generated by the control system.

Calibration and Regulation After Startup

Thermostatic Expansion Valve (TEV) Adjustment

Procedure for checking and adjusting superheat settings on the TEV.

Calibrating Electrical Components

Steps for calibrating key electrical components like pressure transducers and switches.

Liebert CRV Maintenance Procedures

Safety Instructions for Maintenance

Essential safety precautions to follow before and during maintenance operations.

Water and Glycol System Maintenance

Guidelines for maintaining facility water and glycol quality in the coolant system.

Air Filter Inspection and Replacement

Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.

Condensate Drain and Pump System Maintenance

Procedures for checking and maintaining condensate drain lines and pumps.

Considerations for Unit Dismantling and F-Gas Regulation

Guidance on safe dismantling and compliance with F-Gas regulations.

Liebert CRV Troubleshooting Guide

Rack Temperature Issues

Common causes and corrective actions for high rack temperatures.

Evaporator Fan Modulation Problems

Troubleshooting steps when evaporator fans do not modulate correctly.

Capacity Reduction and Humidity Issues

Diagnosing capacity reduction and low/high humidity problems.

Fan Startup Failures and Water Issues

Troubleshooting fan start failures and water leaks around the unit.

Humidifier Operation and Maintenance

Humidifier Principal Operation

Explanation of how the humidifier operates and its principal functions.

Humidifier Water Supply and Startup

Guidelines for water supply, connection, and startup procedures.

Humidifier Troubleshooting and Cylinder Replacement

Common issues, troubleshooting steps, and cylinder replacement guidance.

Remote Rack Sensor Troubleshooting and Setup

DIP Switch Settings for 2T Sensors

Guide to setting DIP switches for 2T sensors to configure identities.

Terminating the Last 2T Sensor on the Network

Methods for terminating the last 2T sensor using plugs or jumpers.

CANbus and Ethernet Cable Wiring

Information on CANbus and Ethernet cable specifications and routing.

Sensor Location and Mounting

Guidelines for selecting sensor locations and mounting them on racks.

Remote Rack Sensor Operation and Setup

Configuring sensors for control or reference and setting up rack view.

Liebert CRV Unit Operation Modes

Cooling Modes (DX and CW)

Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.

Reheating, Dehumidification, and Humidification

Explains operation of optional heating, dehumidification, and humidification features.

Alarms and Events Monitoring

How to interpret and respond to alarms and events generated by the control system.

Calibration and Regulation After Startup

Thermostatic Expansion Valve (TEV) Adjustment

Procedure for checking and adjusting superheat settings on the TEV.

Calibrating Electrical Components

Steps for calibrating key electrical components like pressure transducers and switches.

Liebert CRV Maintenance Procedures

Safety Instructions for Maintenance

Essential safety precautions to follow before and during maintenance operations.

Water and Glycol System Maintenance

Guidelines for maintaining facility water and glycol quality in the coolant system.

Air Filter Inspection and Replacement

Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.

Condensate Drain and Pump System Maintenance

Procedures for checking and maintaining condensate drain lines and pumps.

Considerations for Unit Dismantling and F-Gas Regulation

Guidance on safe dismantling and compliance with F-Gas regulations.

Liebert CRV Troubleshooting Guide

Rack Temperature Issues

Common causes and corrective actions for high rack temperatures.

Evaporator Fan Modulation Problems

Troubleshooting steps when evaporator fans do not modulate correctly.

Capacity Reduction and Humidity Issues

Diagnosing capacity reduction and low/high humidity problems.

Fan Startup Failures and Water Issues

Troubleshooting fan start failures and water leaks around the unit.

Humidifier Operation and Maintenance

Humidifier Principal Operation

Explanation of how the humidifier operates and its principal functions.

Humidifier Water Supply and Startup

Guidelines for water supply, connection, and startup procedures.

Humidifier Troubleshooting and Cylinder Replacement

Common issues, troubleshooting steps, and cylinder replacement guidance.

Remote Rack Sensor Troubleshooting and Setup

DIP Switch Settings for 2T Sensors

Guide to setting DIP switches for 2T sensors to configure identities.

Terminating the Last 2T Sensor on the Network

Methods for terminating the last 2T sensor using plugs or jumpers.

CANbus and Ethernet Cable Wiring

Information on CANbus and Ethernet cable specifications and routing.

Sensor Location and Mounting

Guidelines for selecting sensor locations and mounting them on racks.

Remote Rack Sensor Operation and Setup

Configuring sensors for control or reference and setting up rack view.

Liebert CRV Unit Operation Modes

Cooling Modes (DX and CW)

Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.

Reheating, Dehumidification, and Humidification

Explains operation of optional heating, dehumidification, and humidification features.

Alarms and Events Monitoring

How to interpret and respond to alarms and events generated by the control system.

Calibration and Regulation After Startup

Thermostatic Expansion Valve (TEV) Adjustment

Procedure for checking and adjusting superheat settings on the TEV.

Calibrating Electrical Components

Steps for calibrating key electrical components like pressure transducers and switches.

Liebert CRV Maintenance Procedures

Safety Instructions for Maintenance

Essential safety precautions to follow before and during maintenance operations.

Water and Glycol System Maintenance

Guidelines for maintaining facility water and glycol quality in the coolant system.

Air Filter Inspection and Replacement

Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.

Condensate Drain and Pump System Maintenance

Procedures for checking and maintaining condensate drain lines and pumps.

Considerations for Unit Dismantling and F-Gas Regulation

Guidance on safe dismantling and compliance with F-Gas regulations.

Liebert CRV Troubleshooting Guide

Rack Temperature Issues

Common causes and corrective actions for high rack temperatures.

Evaporator Fan Modulation Problems

Troubleshooting steps when evaporator fans do not modulate correctly.

Capacity Reduction and Humidity Issues

Diagnosing capacity reduction and low/high humidity problems.

Fan Startup Failures and Water Issues

Troubleshooting fan start failures and water leaks around the unit.

Humidifier Operation and Maintenance

Humidifier Principal Operation

Explanation of how the humidifier operates and its principal functions.

Humidifier Water Supply and Startup

Guidelines for water supply, connection, and startup procedures.

Humidifier Troubleshooting and Cylinder Replacement

Common issues, troubleshooting steps, and cylinder replacement guidance.

Remote Rack Sensor Troubleshooting and Setup

DIP Switch Settings for 2T Sensors

Guide to setting DIP switches for 2T sensors to configure identities.

Terminating the Last 2T Sensor on the Network

Methods for terminating the last 2T sensor using plugs or jumpers.

CANbus and Ethernet Cable Wiring

Information on CANbus and Ethernet cable specifications and routing.

Sensor Location and Mounting

Guidelines for selecting sensor locations and mounting them on racks.

Remote Rack Sensor Operation and Setup

Configuring sensors for control or reference and setting up rack view.

Liebert CRV Unit Operation Modes

Cooling Modes (DX and CW)

Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.

Reheating, Dehumidification, and Humidification

Explains operation of optional heating, dehumidification, and humidification features.

Alarms and Events Monitoring

How to interpret and respond to alarms and events generated by the control system.

Calibration and Regulation After Startup

Thermostatic Expansion Valve (TEV) Adjustment

Procedure for checking and adjusting superheat settings on the TEV.

Calibrating Electrical Components

Steps for calibrating key electrical components like pressure transducers and switches.

Liebert CRV Maintenance Procedures

Safety Instructions for Maintenance

Essential safety precautions to follow before and during maintenance operations.

Water and Glycol System Maintenance

Guidelines for maintaining facility water and glycol quality in the coolant system.

Air Filter Inspection and Replacement

Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.

Condensate Drain and Pump System Maintenance

Procedures for checking and maintaining condensate drain lines and pumps.

Considerations for Unit Dismantling and F-Gas Regulation

Guidance on safe dismantling and compliance with F-Gas regulations.

Liebert CRV Troubleshooting Guide

Rack Temperature Issues

Common causes and corrective actions for high rack temperatures.

Evaporator Fan Modulation Problems

Troubleshooting steps when evaporator fans do not modulate correctly.

Capacity Reduction and Humidity Issues

Diagnosing capacity reduction and low/high humidity problems.

Fan Startup Failures and Water Issues

Troubleshooting fan start failures and water leaks around the unit.

Humidifier Operation and Maintenance

Humidifier Principal Operation

Explanation of how the humidifier operates and its principal functions.

Humidifier Water Supply and Startup

Guidelines for water supply, connection, and startup procedures.

Humidifier Troubleshooting and Cylinder Replacement

Common issues, troubleshooting steps, and cylinder replacement guidance.

Remote Rack Sensor Troubleshooting and Setup

DIP Switch Settings for 2T Sensors

Guide to setting DIP switches for 2T sensors to configure identities.

Terminating the Last 2T Sensor on the Network

Methods for terminating the last 2T sensor using plugs or jumpers.

CANbus and Ethernet Cable Wiring

Information on CANbus and Ethernet cable specifications and routing.

Sensor Location and Mounting

Guidelines for selecting sensor locations and mounting them on racks.

Remote Rack Sensor Operation and Setup

Configuring sensors for control or reference and setting up rack view.

Liebert CRV Unit Operation Modes

Cooling Modes (DX and CW)

Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.

Reheating, Dehumidification, and Humidification

Explains operation of optional heating, dehumidification, and humidification features.

Alarms and Events Monitoring

How to interpret and respond to alarms and events generated by the control system.

Calibration and Regulation After Startup

Thermostatic Expansion Valve (TEV) Adjustment

Procedure for checking and adjusting superheat settings on the TEV.

Calibrating Electrical Components

Steps for calibrating key electrical components like pressure transducers and switches.

Liebert CRV Maintenance Procedures

Safety Instructions for Maintenance

Essential safety precautions to follow before and during maintenance operations.

Water and Glycol System Maintenance

Guidelines for maintaining facility water and glycol quality in the coolant system.

Air Filter Inspection and Replacement

Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.

Condensate Drain and Pump System Maintenance

Procedures for checking and maintaining condensate drain lines and pumps.

Considerations for Unit Dismantling and F-Gas Regulation

Guidance on safe dismantling and compliance with F-Gas regulations.

Liebert CRV Troubleshooting Guide

Rack Temperature Issues

Common causes and corrective actions for high rack temperatures.

Evaporator Fan Modulation Problems

Troubleshooting steps when evaporator fans do not modulate correctly.

Capacity Reduction and Humidity Issues

Diagnosing capacity reduction and low/high humidity problems.

Fan Startup Failures and Water Issues

Troubleshooting fan start failures and water leaks around the unit.

Humidifier Operation and Maintenance

Humidifier Principal Operation

Explanation of how the humidifier operates and its principal functions.

Humidifier Water Supply and Startup

Guidelines for water supply, connection, and startup procedures.

Humidifier Troubleshooting and Cylinder Replacement

Common issues, troubleshooting steps, and cylinder replacement guidance.

Remote Rack Sensor Troubleshooting and Setup

DIP Switch Settings for 2T Sensors

Guide to setting DIP switches for 2T sensors to configure identities.

Terminating the Last 2T Sensor on the Network

Methods for terminating the last 2T sensor using plugs or jumpers.

CANbus and Ethernet Cable Wiring

Information on CANbus and Ethernet cable specifications and routing.

Sensor Location and Mounting

Guidelines for selecting sensor locations and mounting them on racks.

Remote Rack Sensor Operation and Setup

Configuring sensors for control or reference and setting up rack view.

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Emerson Liebert CRV User Manual

Table of Contents

Questions and Answers:

Emerson Liebert CRV Specifications

Summary

Important Safety Instructions

Arc flash and electric shock hazard

High temperatures, extreme cold, and rotating fan blades

High-pressure refrigerant discharge

Top-heavy unit falling over

Internal system corrosion and frozen coolant fluid

Understanding Liebert CRV Model Numbers

Unit Family and Depth

System Type and Fan

Power Supply and Cooling System

High-Voltage Options and Packaging

Liebert IntelliSlot® Housing and Special Features

Liebert CRV Component Identification

Top Electrical and Humidifier Connections

Supply, Return, and Bottom Connections

Evaporator Coil and Liebert iCOM®

Liebert CRV System Overview

Product Description and SmartAisle™ Configuration

Inspection, Handling, and Unpacking Procedures

Equipment Inspection and Packing Material

Unit Handling and Moving

Unpacking and Removing the Unit from Skid

Liebert CRV Installation Preparation

Adjusting Leveling Feet

Piping and Fluid Connections

Fluid Connections and Drain Piping

Refrigeration and Hydraulic Circuit Diagrams

Leak Checking Procedures

Air-Cooled Unit Refrigerant Connections

Refrigerant Piping Guidelines

Liebert MC and Fin/Tube Condenser Selection

Vacuum and Refrigerant Charge Procedures

Calculating Refrigerant Charge Values

Water Connections for CRV Units

Water/Glycol Unit Connections

Chilled Water Unit Connections

Electrical System Connections

Field Electrical Connection Descriptions

Power Supply and Wiring Connections

Fan and Heater Protective Features

Liebert CRV Startup and Operation

Initial Startup Steps

Post-Startup Checks

Automatic Restart Configuration

Adjusting Airflow Baffles

Liebert iCOM® Control System Operation

Control Interface and Navigation

Understanding User and Service Menus

Liebert CRV Operation Modes

Setpoints and Sensor Configuration

Maintenance and Wellness Settings

Diagnostics and Alarm Settings

Sensor Calibration Procedures

System and Network Setup

Options Setup and Service Contact

Liebert CRV Teamwork Mode Operation

Unit-to-Unit Network Wiring

Liebert iCOM U2U Ethernet Network Configuration

Teamwork Mode Definitions and Applications

Standby-Rotation and Cascade Functionality

Remote Rack Sensor Installation and Wiring

DIP Switch Settings for 2T Sensors

Terminating the Last 2T Sensor on the Network

CANbus and Ethernet Cable Wiring

Sensor Location and Mounting

Remote Rack Sensor Operation and Setup

Liebert CRV Unit Operation Modes

Cooling Modes (DX and CW)

Reheating, Dehumidification, and Humidification

Alarms and Events Monitoring

Calibration and Regulation After Startup

Thermostatic Expansion Valve (TEV) Adjustment

Calibrating Electrical Components

Liebert CRV Maintenance Procedures

Safety Instructions for Maintenance