How to fix Vertiv Air Conditioner compressor that can’t be started?
If the Vertiv Air Conditioner compressor won’t start, check the main power for under-voltage, over-voltage, and phase loss. Also, inspect the compressor MCB, contactor, and connecting cables. View the unit alarm records, replace any damaged components, and power it on again. If the compressor coils are shorted or burnt, check the motor and replace it if needed.
What to do if Vertiv Air Conditioner has low suction pressure or liquid returned?
If you are experiencing low suction pressure or liquid returned in your Vertiv Air Conditioner, check for leaks and seal any leaking points before adding refrigerant. Replace the air filter if it is dirty and replace the filter drier if it is clogged. Inspect the control board and sensing element of the electronic expansion valve (EEV), replacing the sensing element if faulty. Also, check the air supply and return system for improper airflow distribution, and inspect the condenser for faults related to low condensing pressure.
What to do if Vertiv Air Conditioner high pressure protection is on?
If the high-pressure protection is activated on your Vertiv Air Conditioner, start by cleaning the condenser. If you have an air-cooled system, check the condenser fan. Also, verify that the sub-cooling degree isn't too high, indicating that too much refrigerant has been charged.
Why Vertiv Liebert CR012 EC fan can’t be started?
If the EC fan of your Vertiv Air Conditioner isn’t starting, verify that the fan MCB is closed and that each phase's power voltage is normal. Check J15 on the micro-processing control board to see if the control board is faulty. Also, check the alarm lamp on the fan power module to determine if it’s faulty. Inspect L1, L2, and L3 of the fan for power failure, phase loss, and low voltage. Ensure the analog output is within the range of 0 ~ 10Vdc. Check if the motor is clogged or too hot, and check for Hall failure.
What to do if Vertiv Liebert CR012 compressor is too noisy?
If your Vertiv Air Conditioner's compressor is excessively noisy, it might be due to liquid return, so refer to the troubleshooting steps for 'Low suction pressure' or 'liquid returned'. It could also be caused by worn bearings due to lubricant loss, in which case you should add lubricant.
What to do if Vertiv Liebert CR012 Air Conditioner heating system does not start?
If the heating system of your Vertiv Air Conditioner doesn't start and the contactor doesn't close, check the state of the micro-processing controller to confirm if there is a heating command. Use a multi-meter to measure the resistance on both ends of the temperature controller; if the resistance is very large, it indicates that the safety device may be open. Next, check whether the fuse is open and the temperature controller is damaged. Measure the resistance of the heater with an ohmmeter to judge if the heater is damaged.
What to do if Vertiv Air Conditioner contactor closes, but heating is ineffective?
If the contactor in your Vertiv Air Conditioner closes but the heating is ineffective, check if the heater's MCB is turned ON and whether the L1, L2, and L3 voltages are normal when the contactor is energized. Also, turn off the power and physically inspect the condition of the electric heater to see if it has burned out.
What to do if Vertiv Liebert CR012 has low exhaust pressure?
If your Vertiv Air Conditioner has low exhaust pressure, locate the refrigerant leakage point, repair it, and add refrigerant. If the fan speed controller of the outdoor unit is faulty, and the output voltage remains at 100% regardless of changes in condensing pressure, replace the fan speed controller.
What to do if Vertiv Liebert CR012 compressor stops after running for 3 minutes?
If the Vertiv Air Conditioner compressor stops after running for 3 minutes and the contactor opens, check the suction pressure for refrigerant leaks, which may cause a low-pressure reading. Also, check the circuit of the low-pressure sensor and calibrate the low-pressure sensor reader to be within ±0.3 bar range of the actual pressure.
What does it mean if Vertiv Liebert CR012 Air Conditioner suction and exhaust pressures do not change after startup?
If the suction and exhaust pressures of your Vertiv Air Conditioner do not change after startup, it indicates that either the compressor is reversed or the internal air tightness of the compressor has failed. If the compressor is reversed, exchange any two L lines of the compressor. If the internal air tightness of the compressor has failed and cannot be restored, replace the compressor.
General| Brand | Vertiv |
|---|---|
| Model | Liebert CR012 |
| Category | Air Conditioner |
| Language | English |
Defines the model nomenclature of the CR012 AC unit.
Lists the fundamental performance parameters of the Liebert CR012 AC.
Describes the Liebert CR012 cooling unit's comprehensive functions and design.
Details the primary components of the Liebert CR012 Precision Air conditioners, including compressor, fan, and evaporator.
Discusses compatibility with multiple temperature/humidity sensors and Modbus protocol.
Covers environmental conditions for operating and storing the Liebert CR012 air conditioners.
Covers preliminary steps before installing the CR012 air conditioner, including transport, unpacking, and inspection.
Details requirements for the equipment room and installation space for optimal CR012 performance.
Explains the detailed steps for mechanical installation, including system arrangement, piping, and procedures.
Covers electrical installation, including on-site wire connections, installation notes, and cable connections.
Outlines the commissioning process, including self-check, preparation, and startup inspection.
Introduces the micro-processing controller for managing the Liebert CR012 AC unit.
Describes the five control buttons on the micro-controller and their functions.
Provides step-by-step examples for accessing menus and changing parameters.
Explains the main screen display after startup, showing operating parameters and unit status.
Details the password interface and the different levels of access for menus.
Outlines the main menu structure and sub-menu options for controller functions.
Describes how to view historical alarm records, including type, start, and end times.
Guides users on accessing the Alarm Settings menu to configure alarm parameters.
Details how to view and navigate the Alarm Setpoint menu for various parameters.
Explains how to access and navigate the System Alarm menu for configuring alarm states.
Guides on setting temperature and humidity parameters, including compressor and fan modes.
Explains how to view system state, including run state, analog signals, and switch signals.
Displays important operating parameters like ambient temperature, compressor, fan, and EEV states.
Shows device environment data, pressure, temperature, and voltage relevant to the compressor.
Allows viewing input and output states of devices and their on/off records.
Indicates the running time of various components like fan, compressor, heater, and humidifier.
Provides start and stop records for important components, unaffected by power failure.
Allows accessing and modifying system settings, which are retained after power loss.
Displays and allows modification of basic system settings, including a factory reset function.
Configures fan settings, including analog limits, speed, and step parameters.
Allows setting compressor parameters like capacity, run times, and pressure limits.
Configures Electronic Expansion Valve (EEV) settings such as superheat setpoint and start/stop delays.
Enables manual control of certain components, allowing direct adjustment of their operation.
Provides access to date, time, password, and version information.
Covers teamwork functions, main/standby operations, rotation, wiring, and parameter settings for multiple units.
Provides a monthly checklist for inspecting components like filters, fans, compressor, and refrigeration system.
Offers a bi-annual checklist for components, including air filters, fans, compressor, and electrical control parts.
Highlights the built-in diagnostic function of the micro-controller for component checks.
Details maintenance procedures for electrical parts and control systems, including visual checks and insulation tests.
Explains the function and recommended placement of water leak detectors.
Provides instructions for maintaining air filters, including setting logic and replacement intervals.
Guides on inspecting EC fans, motor status, impeller, and air duct for proper operation.
Outlines maintenance instructions for electrical heaters, including periodic monitoring and inspection.
Details instructions for maintaining the refrigerating system, including monthly system checks and pipe inspections.
Covers periodic inspection of the water tray and drainage pipe for normal operation.
Provides troubleshooting steps for common issues related to fans, heating systems, and compressors.
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