1 IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important safety instructions that should be followed during the installation and
maintenance of the Liebert CRV. Read this manual thoroughly before attempting to install or operate this
unit.
Only qualified personnel should move, install or service this equipment.
Adhere to all warnings, cautions, notices and installation, operating and safety instructions on the unit
and in this manual. Follow all installation, operation and maintenance instructions and all applicable
national and local building, electrical and plumbing codes.
Any operation that requires opening doors or equipment panels must be carried out only by properly-
trained and qualified personnel.
To identify the unit model and serial number for assistance or spare parts, locate the identification label
on the unit. The label is inside the door on 600 mm (24 in.) units and at the electrical box on 300 mm (12
in.) units.
A warning label on the front and back panels reminds users that:
• the Liebert CRV restarts automatically
• the main switch must be opened before opening the internal compartments for any operation.
WARNING! Arc flash and electric shock hazard. Open all local and remote electric power
disconnect switches, verify with a voltmeter that power is Off and wear personal protective
equipment (PPE) per NFPA 70E before working within the electric control enclosure. Failure to
comply can cause serious injury or death. Customer must provide earth ground to unit, per
NEC, CEC and local codes, as applicable. Before proceeding with installation, read all
instructions, verify that all the parts are included and check the nameplate to be sure the
voltage matches available utility power. The Liebert 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 controller. The factory-supplied, optional disconnect switch
is inside the unit. The line side of this switch contains live high-voltage. The only way to ensure
that there is NO voltage inside the unit is to install and open a remote disconnect switch. Refer
to unit electrical schematic. Follow all local codes.
WARNING! Risk of explosive discharge from high-pressure refrigerant. Can cause loss of
refrigerant, environmental pollution, injury or death. This unit contains fluids and gases under
high pressure. Relieve pressure before working with piping.
WARNING! Risk of refrigerant system rupture or explosion from overpressurization. Can cause
equipment damage, injury or death. Use extreme caution when charging the refrigerant system.
Do not pressurize the system higher than the design pressure marked on the unit's nameplate.
Vertiv | Liebert CRV Installer/User Guide | 7
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