12.4 Spare Parts
Only original spare parts made by Vertiv must be used. Using third-party material will invalidate the warranty. When seeking
technical assistance, always refer to the component list supplied with the equipment, and specify the model number, serial
number and, if available, the part number.
NOTE: When replacing a faulty component, follow the relevant manufacturer instructions.
NOTE: When the spare parts must be brazed, be careful not to damage the internal parts (gaskets, seals, O-rings,
etc.).
12.5 Electronic Expansion Valve (EEV) Maintenance
The EEV controls superheat through the Vertiv™ Liebert® iCOM™ controls by actively measuring suction pressure via a
transducer attached to the suction line rotalock and suction temperature via a thermister strapped to the suction line. The
EEV actively adjusts the orifice size and resulting mass flow of refrigerant to maintain the superheat setpoint (set in Liebert®
iCOM™).
WARNING! Risk of electric shock. Can cause serious injury or death. Building and equipment damage may also
result. Open all local and remote electric power supply disconnect switches and verify that power is off with a
voltmeter before working within any electric connection enclosures. The Liebert® iCOM™ controller does not
isolate power from the unit, even in the "Unit Off" mode. Some internal components require and receive power
even during the "unit off" mode of the Liebert® iCOM™ controller.
Installation, service, and maintenance work must be performed only by properly trained and qualified
personnel and in accordance with applicable regulations and manufacturers’ specifications. Opening or
removing the covers to any equipment may expose personnel to lethal voltages within the unit even when it is
apparently not operating and the input wiring is disconnected from the electrical source.
NOTE: Intermittent loss of subcooling may result in EEV/superheat instability. If superheat instability is observed,
check for proper refrigerant level in receiver (Refrigerant Piping Guidelines for Air Cooled Systems on page48 for the
proper charge level). If proper charge is observed in receiver, and superheat remains unstable, then increase
superheat setting in the Liebert® iCOM™ to 15°F (8.49°C).
12.6 Compressor Maintenance
12.6.1 Compressor Oil
NOTICE
Risk of improper compressor lubrication. Can cause compressor and refrigerant system damage.
Failure to use oil types, viscosities and quantities recommended by the compressor manufacturer may reduce
compressor life and void the compressor warranty.
• Do not mix polyolester (POE) and mineral-based oils.
• Do not mix oils of different viscosities.
• Consult Vertiv technical support or the compressor manufacturer if questions arise.
12 Maintenance Proprietary and Confidential ©2024 Vertiv Group Corp. 95
Vertiv™ CoolPhase CDU Installer/User Guide
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