Vertiv Liebert MC series Installer/User Manual Download

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11 MAINTENANCE

WARNING! Arc flash and electric shock hazard. Open all local and remote electric power supply disconnect
switches, verify with a voltmeter that power is Off and wear appropriate, OSHA approved 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 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 equipment damage, injury or death. Open all local and remote
electric power supply disconnect switches and verify with a voltmeter that power is off before working within
any electric connection enclosures. 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.

WARNING! Risk of electric shock. Can cause serious injury or death. The Liebert® iCOM™ 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 the Liebert® iCOM™ control. Open all local and remote
electric power disconnect switches and verify with a voltmeter that power is Off before working on any
component of the system.

WARNING! Risk of contact with high speed rotating fan blades. Can cause serious injury or death. Open all
local and remote electric power supply disconnect switches, verify with a voltmeter that power is off, and
verify that all fan blades have stopped rotating before working in the unit cabinet or on the fan assembly. If
control voltage is applied, the fan motor can restart without warning after a power failure. Do not operate the
unit with any or all cabinet panels removed.

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Good maintenance practices are essential to minimizing operation costs and maximizing product life.

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Read and follow monthly and semi-annual maintenance schedules included in this manual. These MINIMUM
maintenance intervals may need to be more frequent based on site specific conditions.

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We recommend the use of trained and authorized service personnel, extended service contracts and factory
specified replacement parts. Contact your Vertiv sales representative.

11 Maintenance