7 INITIAL STARTUP CHECKS AND COMMISSIONING
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.
WARNING! Risk of electric shock. Can cause injury or death.
Open all local and remote unit electric power supply disconnect switches, wait 10 minutes and
verify with a voltmeter that power is Off before working within the fan speed control, the EC fan
electrical enclosures or checking any electrical connections or functions. Unit contains
potentially lethal electrical voltage. Line side of factory disconnect remains energized when
disconnect is Off.
Only properly trained and qualified personnel may perform repair, maintenance and cleaning
operation.
WARNING! Risk of high-speed, rotating fan blades. Can cause injury or death.
Fan blades can start rotating without warning at any time during a cooling cycle or after power
is restored after a power failure. Open all local and remote unit electrical power supply
disconnect switches, verify with a voltmeter that the power is Off and verify that all fan blades
have stopped rotating before working on or near the fans.
Vertiv | Liebert® MC™ Installer/User Guide | 85
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