Why is my Emerson Air Conditioner showing a Digital Scroll Sensor Failure?
If you're seeing a Digital Scroll Sensor Failure, start by verifying the sensor reading in the User Menu, Sensor Data. Then, check the plug connections.
What causes low supply temperature alarm or room overcooling in my Emerson Liebert CRV?
A low supply temperature alarm or room overcooling can be triggered by low return temperature. Place a unit into standby (if applicable). Poor airflow can also cause this issue, so install blanking panels in open areas of racks. Direct discharge baffles to heat source. Check cooling water temperature if supply chilled water temperature is too low.
Why is the Emerson Air Conditioner cooling unit noise level higher than expected?
An unexpectedly high noise level in the cooling unit may be due to incorrect positioning of remote temperature sensors; verify their correct positioning. Another potential cause is unbalanced heat load distribution; try to redistribute the rack heat load.
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 |
Risk of injury or death from arc flash and electric shock.
Warning about hazards from high temperatures, extreme cold, and fast-spinning fan blades.
Risk of injury or death from explosive discharge of high-pressure refrigerant.
Warning about potential tip-over causing equipment damage, injury, or death.
Risk of equipment damage and leaks due to internal system corrosion or frozen coolant.
Defines the unit family (Liebert CRV) and its row-based depth.
Specifies the system type (Air Cooled, Water/Glycol, Chilled Water) and fan type.
Details the unit's power supply voltage and the cooling system configuration.
Describes high-voltage options, unit color, and packaging type (Domestic or Export).
Details IntelliSlot housing options and special unit features.
Identifies top electrical entrance and humidifier supply/drain connections.
Locates supply/return connections, bottom electrical entrance, and drain connections.
Pinpoints the evaporator/CW coil and the Liebert iCOM control unit.
Details the CRV's function as a precision cooling unit and its role in SmartAisle™.
Instructions for inspecting the unit upon arrival and handling packaging material.
Guidelines for handling the unit, including center of gravity and weights.
Steps for unpacking the unit and safely removing it from the shipping skid.
Procedure for adjusting the unit's base supports to ensure it is level.
Details on fluid connections, condensate drain piping, and gravity drains.
Provides general arrangements for refrigeration and hydraulic circuits.
Guidelines for leak checking unit fluid systems and field piping.
Instructions for piping, including material, layout, and installation practices.
Guidance on selecting Liebert MC and Fin/Tube condensers for CRV units.
Details on evacuating air-cooled units and charging the system with refrigerant.
Methods for calculating correct refrigerant charge for MC condenser systems.
Details water and glycol connections for 600mm units, including glycol mixtures.
Information on water connections for chilled water units, including circuit diagrams.
Details on standard and optional electrical field connections for 600mm and 300mm models.
Instructions for power supply cable connections and wiring, including remote/alarm signals.
Describes protective features for electronically commutated fans and electrical heaters.
Step-by-step guide for initial startup of the Liebert CRV unit.
Essential checks to perform after the system is operating under load.
How to configure the unit for automatic restart after a power interruption.
Instructions for adjusting airflow baffles for optimal cooling and rack alignment.
Overview of the iCOM control interface, menus, and navigation methods.
Guide to accessing and using User, Service, and Advanced menus.
Explanation of cooling, fan speed, and humidification control modes.
Details on setting parameters like temperature, humidity, and fan speed sensors.
Information on calculating unit wellness and setting maintenance parameters.
Guides for diagnostics, service modes, and configuring alarm parameters.
Steps for calibrating temperature and humidity sensors for accurate readings.
Configuration of network settings, unit names, and IP addresses for iCOM units.
Configuration of unit options, service contact information, and troubleshooting.
Instructions for wiring units for U2U communication and network setup.
Details on setting up the U2U Ethernet network for iCOM communication.
Explains different teamwork modes (No Teamwork, Mode 1, 2, 3) and their applications.
Describes standby rotation, lead/lag, and cascade functions for unit coordination.
Guide to setting DIP switches for 2T sensors to configure identities.
Methods for terminating the last 2T sensor using plugs or jumpers.
Information on CANbus and Ethernet cable specifications and routing.
Guidelines for selecting sensor locations and mounting them on racks.
Configuring sensors for control or reference and setting up rack view.
Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.
Explains operation of optional heating, dehumidification, and humidification features.
How to interpret and respond to alarms and events generated by the control system.
Procedure for checking and adjusting superheat settings on the TEV.
Steps for calibrating key electrical components like pressure transducers and switches.
Essential safety precautions to follow before and during maintenance operations.
Guidelines for maintaining facility water and glycol quality in the coolant system.
Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.
Procedures for checking and maintaining condensate drain lines and pumps.
Guidance on safe dismantling and compliance with F-Gas regulations.
Common causes and corrective actions for high rack temperatures.
Troubleshooting steps when evaporator fans do not modulate correctly.
Diagnosing capacity reduction and low/high humidity problems.
Troubleshooting fan start failures and water leaks around the unit.
Explanation of how the humidifier operates and its principal functions.
Guidelines for water supply, connection, and startup procedures.
Common issues, troubleshooting steps, and cylinder replacement guidance.
Guide to setting DIP switches for 2T sensors to configure identities.
Methods for terminating the last 2T sensor using plugs or jumpers.
Information on CANbus and Ethernet cable specifications and routing.
Guidelines for selecting sensor locations and mounting them on racks.
Configuring sensors for control or reference and setting up rack view.
Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.
Explains operation of optional heating, dehumidification, and humidification features.
How to interpret and respond to alarms and events generated by the control system.
Procedure for checking and adjusting superheat settings on the TEV.
Steps for calibrating key electrical components like pressure transducers and switches.
Essential safety precautions to follow before and during maintenance operations.
Guidelines for maintaining facility water and glycol quality in the coolant system.
Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.
Procedures for checking and maintaining condensate drain lines and pumps.
Guidance on safe dismantling and compliance with F-Gas regulations.
Common causes and corrective actions for high rack temperatures.
Troubleshooting steps when evaporator fans do not modulate correctly.
Diagnosing capacity reduction and low/high humidity problems.
Troubleshooting fan start failures and water leaks around the unit.
Explanation of how the humidifier operates and its principal functions.
Guidelines for water supply, connection, and startup procedures.
Common issues, troubleshooting steps, and cylinder replacement guidance.
Guide to setting DIP switches for 2T sensors to configure identities.
Methods for terminating the last 2T sensor using plugs or jumpers.
Information on CANbus and Ethernet cable specifications and routing.
Guidelines for selecting sensor locations and mounting them on racks.
Configuring sensors for control or reference and setting up rack view.
Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.
Explains operation of optional heating, dehumidification, and humidification features.
How to interpret and respond to alarms and events generated by the control system.
Procedure for checking and adjusting superheat settings on the TEV.
Steps for calibrating key electrical components like pressure transducers and switches.
Essential safety precautions to follow before and during maintenance operations.
Guidelines for maintaining facility water and glycol quality in the coolant system.
Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.
Procedures for checking and maintaining condensate drain lines and pumps.
Guidance on safe dismantling and compliance with F-Gas regulations.
Common causes and corrective actions for high rack temperatures.
Troubleshooting steps when evaporator fans do not modulate correctly.
Diagnosing capacity reduction and low/high humidity problems.
Troubleshooting fan start failures and water leaks around the unit.
Explanation of how the humidifier operates and its principal functions.
Guidelines for water supply, connection, and startup procedures.
Common issues, troubleshooting steps, and cylinder replacement guidance.
Guide to setting DIP switches for 2T sensors to configure identities.
Methods for terminating the last 2T sensor using plugs or jumpers.
Information on CANbus and Ethernet cable specifications and routing.
Guidelines for selecting sensor locations and mounting them on racks.
Configuring sensors for control or reference and setting up rack view.
Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.
Explains operation of optional heating, dehumidification, and humidification features.
How to interpret and respond to alarms and events generated by the control system.
Procedure for checking and adjusting superheat settings on the TEV.
Steps for calibrating key electrical components like pressure transducers and switches.
Essential safety precautions to follow before and during maintenance operations.
Guidelines for maintaining facility water and glycol quality in the coolant system.
Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.
Procedures for checking and maintaining condensate drain lines and pumps.
Guidance on safe dismantling and compliance with F-Gas regulations.
Common causes and corrective actions for high rack temperatures.
Troubleshooting steps when evaporator fans do not modulate correctly.
Diagnosing capacity reduction and low/high humidity problems.
Troubleshooting fan start failures and water leaks around the unit.
Explanation of how the humidifier operates and its principal functions.
Guidelines for water supply, connection, and startup procedures.
Common issues, troubleshooting steps, and cylinder replacement guidance.
Guide to setting DIP switches for 2T sensors to configure identities.
Methods for terminating the last 2T sensor using plugs or jumpers.
Information on CANbus and Ethernet cable specifications and routing.
Guidelines for selecting sensor locations and mounting them on racks.
Configuring sensors for control or reference and setting up rack view.
Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.
Explains operation of optional heating, dehumidification, and humidification features.
How to interpret and respond to alarms and events generated by the control system.
Procedure for checking and adjusting superheat settings on the TEV.
Steps for calibrating key electrical components like pressure transducers and switches.
Essential safety precautions to follow before and during maintenance operations.
Guidelines for maintaining facility water and glycol quality in the coolant system.
Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.
Procedures for checking and maintaining condensate drain lines and pumps.
Guidance on safe dismantling and compliance with F-Gas regulations.
Common causes and corrective actions for high rack temperatures.
Troubleshooting steps when evaporator fans do not modulate correctly.
Diagnosing capacity reduction and low/high humidity problems.
Troubleshooting fan start failures and water leaks around the unit.
Explanation of how the humidifier operates and its principal functions.
Guidelines for water supply, connection, and startup procedures.
Common issues, troubleshooting steps, and cylinder replacement guidance.
Guide to setting DIP switches for 2T sensors to configure identities.
Methods for terminating the last 2T sensor using plugs or jumpers.
Information on CANbus and Ethernet cable specifications and routing.
Guidelines for selecting sensor locations and mounting them on racks.
Configuring sensors for control or reference and setting up rack view.
Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.
Explains operation of optional heating, dehumidification, and humidification features.
How to interpret and respond to alarms and events generated by the control system.
Procedure for checking and adjusting superheat settings on the TEV.
Steps for calibrating key electrical components like pressure transducers and switches.
Essential safety precautions to follow before and during maintenance operations.
Guidelines for maintaining facility water and glycol quality in the coolant system.
Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.
Procedures for checking and maintaining condensate drain lines and pumps.
Guidance on safe dismantling and compliance with F-Gas regulations.
Common causes and corrective actions for high rack temperatures.
Troubleshooting steps when evaporator fans do not modulate correctly.
Diagnosing capacity reduction and low/high humidity problems.
Troubleshooting fan start failures and water leaks around the unit.
Explanation of how the humidifier operates and its principal functions.
Guidelines for water supply, connection, and startup procedures.
Common issues, troubleshooting steps, and cylinder replacement guidance.
Guide to setting DIP switches for 2T sensors to configure identities.
Methods for terminating the last 2T sensor using plugs or jumpers.
Information on CANbus and Ethernet cable specifications and routing.
Guidelines for selecting sensor locations and mounting them on racks.
Configuring sensors for control or reference and setting up rack view.
Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.
Explains operation of optional heating, dehumidification, and humidification features.
How to interpret and respond to alarms and events generated by the control system.
Procedure for checking and adjusting superheat settings on the TEV.
Steps for calibrating key electrical components like pressure transducers and switches.
Essential safety precautions to follow before and during maintenance operations.
Guidelines for maintaining facility water and glycol quality in the coolant system.
Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.
Procedures for checking and maintaining condensate drain lines and pumps.
Guidance on safe dismantling and compliance with F-Gas regulations.
Common causes and corrective actions for high rack temperatures.
Troubleshooting steps when evaporator fans do not modulate correctly.
Diagnosing capacity reduction and low/high humidity problems.
Troubleshooting fan start failures and water leaks around the unit.
Explanation of how the humidifier operates and its principal functions.
Guidelines for water supply, connection, and startup procedures.
Common issues, troubleshooting steps, and cylinder replacement guidance.
Guide to setting DIP switches for 2T sensors to configure identities.
Methods for terminating the last 2T sensor using plugs or jumpers.
Information on CANbus and Ethernet cable specifications and routing.
Guidelines for selecting sensor locations and mounting them on racks.
Configuring sensors for control or reference and setting up rack view.
Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.
Explains operation of optional heating, dehumidification, and humidification features.
How to interpret and respond to alarms and events generated by the control system.
Procedure for checking and adjusting superheat settings on the TEV.
Steps for calibrating key electrical components like pressure transducers and switches.
Essential safety precautions to follow before and during maintenance operations.
Guidelines for maintaining facility water and glycol quality in the coolant system.
Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.
Procedures for checking and maintaining condensate drain lines and pumps.
Guidance on safe dismantling and compliance with F-Gas regulations.
Common causes and corrective actions for high rack temperatures.
Troubleshooting steps when evaporator fans do not modulate correctly.
Diagnosing capacity reduction and low/high humidity problems.
Troubleshooting fan start failures and water leaks around the unit.
Explanation of how the humidifier operates and its principal functions.
Guidelines for water supply, connection, and startup procedures.
Common issues, troubleshooting steps, and cylinder replacement guidance.
Guide to setting DIP switches for 2T sensors to configure identities.
Methods for terminating the last 2T sensor using plugs or jumpers.
Information on CANbus and Ethernet cable specifications and routing.
Guidelines for selecting sensor locations and mounting them on racks.
Configuring sensors for control or reference and setting up rack view.
Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.
Explains operation of optional heating, dehumidification, and humidification features.
How to interpret and respond to alarms and events generated by the control system.
Procedure for checking and adjusting superheat settings on the TEV.
Steps for calibrating key electrical components like pressure transducers and switches.
Essential safety precautions to follow before and during maintenance operations.
Guidelines for maintaining facility water and glycol quality in the coolant system.
Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.
Procedures for checking and maintaining condensate drain lines and pumps.
Guidance on safe dismantling and compliance with F-Gas regulations.
Common causes and corrective actions for high rack temperatures.
Troubleshooting steps when evaporator fans do not modulate correctly.
Diagnosing capacity reduction and low/high humidity problems.
Troubleshooting fan start failures and water leaks around the unit.
Explanation of how the humidifier operates and its principal functions.
Guidelines for water supply, connection, and startup procedures.
Common issues, troubleshooting steps, and cylinder replacement guidance.
Guide to setting DIP switches for 2T sensors to configure identities.
Methods for terminating the last 2T sensor using plugs or jumpers.
Information on CANbus and Ethernet cable specifications and routing.
Guidelines for selecting sensor locations and mounting them on racks.
Configuring sensors for control or reference and setting up rack view.
Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.
Explains operation of optional heating, dehumidification, and humidification features.
How to interpret and respond to alarms and events generated by the control system.
Procedure for checking and adjusting superheat settings on the TEV.
Steps for calibrating key electrical components like pressure transducers and switches.
Essential safety precautions to follow before and during maintenance operations.
Guidelines for maintaining facility water and glycol quality in the coolant system.
Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.
Procedures for checking and maintaining condensate drain lines and pumps.
Guidance on safe dismantling and compliance with F-Gas regulations.
Common causes and corrective actions for high rack temperatures.
Troubleshooting steps when evaporator fans do not modulate correctly.
Diagnosing capacity reduction and low/high humidity problems.
Troubleshooting fan start failures and water leaks around the unit.
Explanation of how the humidifier operates and its principal functions.
Guidelines for water supply, connection, and startup procedures.
Common issues, troubleshooting steps, and cylinder replacement guidance.
Guide to setting DIP switches for 2T sensors to configure identities.
Methods for terminating the last 2T sensor using plugs or jumpers.
Information on CANbus and Ethernet cable specifications and routing.
Guidelines for selecting sensor locations and mounting them on racks.
Configuring sensors for control or reference and setting up rack view.
Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.
Explains operation of optional heating, dehumidification, and humidification features.
How to interpret and respond to alarms and events generated by the control system.
Procedure for checking and adjusting superheat settings on the TEV.
Steps for calibrating key electrical components like pressure transducers and switches.
Essential safety precautions to follow before and during maintenance operations.
Guidelines for maintaining facility water and glycol quality in the coolant system.
Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.
Procedures for checking and maintaining condensate drain lines and pumps.
Guidance on safe dismantling and compliance with F-Gas regulations.
Common causes and corrective actions for high rack temperatures.
Troubleshooting steps when evaporator fans do not modulate correctly.
Diagnosing capacity reduction and low/high humidity problems.
Troubleshooting fan start failures and water leaks around the unit.
Explanation of how the humidifier operates and its principal functions.
Guidelines for water supply, connection, and startup procedures.
Common issues, troubleshooting steps, and cylinder replacement guidance.
Guide to setting DIP switches for 2T sensors to configure identities.
Methods for terminating the last 2T sensor using plugs or jumpers.
Information on CANbus and Ethernet cable specifications and routing.
Guidelines for selecting sensor locations and mounting them on racks.
Configuring sensors for control or reference and setting up rack view.
Describes how the unit operates in Direct Expansion and Chilled Water cooling modes.
Explains operation of optional heating, dehumidification, and humidification features.
How to interpret and respond to alarms and events generated by the control system.
Procedure for checking and adjusting superheat settings on the TEV.
Steps for calibrating key electrical components like pressure transducers and switches.
Essential safety precautions to follow before and during maintenance operations.
Guidelines for maintaining facility water and glycol quality in the coolant system.
Steps for inspecting and replacing air filters for efficient airflow in 600mm and 300mm models.
Procedures for checking and maintaining condensate drain lines and pumps.
Guidance on safe dismantling and compliance with F-Gas regulations.
Common causes and corrective actions for high rack temperatures.
Troubleshooting steps when evaporator fans do not modulate correctly.
Diagnosing capacity reduction and low/high humidity problems.
Troubleshooting fan start failures and water leaks around the unit.
Explanation of how the humidifier operates and its principal functions.
Guidelines for water supply, connection, and startup procedures.
Common issues, troubleshooting steps, and cylinder replacement guidance.
Guide to setting DIP switches for 2T sensors to configure identities.
Methods for terminating the last 2T sensor using plugs or jumpers.
Information on CANbus and Ethernet cable specifications and routing.
Guidelines for selecting sensor locations and mounting them on racks.
Configuring sensors for control or reference and setting up rack view.
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