IMPORTANT SAFETY GUIDELINES
Save These Instructions
This manual contains important safety instructions that should be followed during the installation and
maintenance of the Liebert MC. 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 and installation, operating and safety instructions on the unit and in this
manual. Follow all operating and user instructions.
WARNING! Risk of improper handling, installation and service. Can cause property damage,
injury or death.
Only properly trained and qualified personnel should install or perform repairs or maintenance
on this unit. Read all installation, operation and safety alerts and instructions and wear
appropriate protective headgear, safety glasses, gloves and clothing before installing,
operating or servicing this unit.
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 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 LiebertiCOM® microprocessor 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
LiebertiCOM control.
The factory-supplied 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.
Vertiv | Liebert® MC™ Installer/User Guide | 5
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