6 Electrical Connections
Line voltage electrical service is required for all models. Electrical service must conform to national and local electrical codes.
Refer to equipment nameplate regarding wire size and circuit protection requirements. Refer to electrical schematic when
making connections. Refer the appropriate submittal drawing, listed in Table 6.1 on the next page, for electrical service
entrances into unit.
A manual electrical disconnect switch should be installed in accordance with local codes and distribution system. Consult
local codes for external disconnect requirements.
All internal wiring is completed at the factory.
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 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 improper wiring, piping, moving, lifting and handling. Can cause equipment damage,
serious injury or death. Installation and service of this equipment should be done only by qualified personnel
who have been specially trained in the installation of air conditioning equipment and who are wearing
appropriate, OSHA-approved PPE.
WARNING! Risk of improper wire sizing/rating and loose electrical connections. Can cause overheated wire
and electrical connection terminals resulting in smoke, fire, equipment and building damage, injury or death.
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.
NOTICE
Risk of improper power supply connection. Can cause equipment damage and loss of warranty coverage.
Prior to connecting any equipment to a main or alternate power source (for example: backup generator systems)
for start up, commissioning, testing, or normal operation, ensure that these sources are correctly adjusted to the
nameplate voltage and frequency of all equipment to be connected. In general, power source voltages should be
stabilized and regulated to within ±10% of the load nameplate nominal voltage. Also, ensure that no three phase
sources are single phased at any time.
NOTE: Use copper wiring only. Make sure that all connections are tightened to the proper torque mentioned on the
component.
The electrical connections are described in the submittal documents included in the Submittal Drawings.
6 Electrical Connections Proprietary and Confidential ©2024 Vertiv Group Corp. 21
Vertiv™ Liebert® MCV Installer/User Guide
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