Electrical Connections - Liebert PX018 Installer's/User's Manual

6 ELECTRICAL CONNECTIONS

Three-phase 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.
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,
OHSA-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 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, wearing appropriate, OSHA-approved PPE, who have been specially-
trained in the installation of air-conditioning equipment.
NOTE: Seal openings around piping and electrical connection to prevent air leakage. Failure to do so
could reduce the unit's cooling performance.
WARNING! Risk of improper wire 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.
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