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 Vertiv™
Liebert® iCOM™ 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 Liebert® iCOM™ 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 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 short circuits and electric shock. Can cause serious injury or death. Building and
equipment damage can result from cut insulation or damaged wires. Can cause overheated wiring, smoke,
fire, activation of fire suppression systems and EMS personnel, and loss of power to fans. Verify that all
wiring connections are tight and that all wiring is contained within the junction box prior to closing and
securing the cover.
Insert CSA-certified or UL-listed bushings into holes and/or knockouts used to route wiring through metal
panels to protect the wire insulation from contact with sheet metal edges.
WARNING! Risk of improper wire sizing/rating and loose electrical connections causing overheated wire and
electrical connection terminals resulting in smoke or fire. Can cause serious injury or death. Building and
equipment damage may also result. Use correctly sized copper wire only and verify that all electrical
connections are tight before turning power On. Check all electrical connections periodically and tighten as
necessary.
2 Proprietary and Confidential ©2024 Vertiv Group Corp. 1 Important Safety Instructions
Vertiv™ CoolPhase CDU Installer/User Guide
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