13 MAINTENANCE
13.1 Safety Instructions
All maintenance operations must strictly observe national, state and local accident prevention
regulations, especially the regulations concerning electrical systems, refrigerators and manufacturing
resources.
Air conditioning equipment maintenance may be performed only by authorized properly trained and
qualified personnel.
To keep all warranties valid, the maintenance must adhere to the manufacturer’s regulations.
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 contact with high-speed, rotating fan impeller blades. Can cause injury or
death. Open all local and remote electrical-supply disconnect switches, verify with a voltmeter
that power is off, and verify that all fan impellers have stopped rotating before working in the
unit.
WARNING! Risk of contact with extremely hot and/or cold surfaces. Can cause equipment
damage, injury and death. Open all local and remote electric power supply disconnect switches,
verify with a voltmeter that power is Off, and verify that all components have reached a
temperature that is safe for human contact or wear appropriate, OSHA-approved PPE before
working within the electric connection enclosures or unit cabinet. Perform maintenance only
when the system is de-energized and component temperatures have become safe for human
contact.
WARNING! Risk of hair, clothing and jewelry entanglement with high speed rotating fan blades.
Can cause equipment damage, serious injury or death. Keep hair, jewelry and loose clothing
secured and away from rotating fan blades during unit operation.
Vertiv | Liebert CRV Installer/User Guide | 133
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