Vertiv Liebert Mini-Mate MT048 - ELECTRICAL CONNECTION REQUIREMENTS

5 ELECTRICAL CONNECTION 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,
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 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 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.
NOTE: Seal openings around piping and electrical connections to prevent air leakage. Failure to do so
could reduce the unit's cooling performance.
NOTICE
Risk of improper electrical supply connection. Can cause equipment damage.
See transformer label for primary tap connections. Installer will need to change transformer
primary taps if applied unit voltage is other than pre-wired tap voltage.
NOTE: For 208-VAC, 3-ton applications, the low-voltage transformer tap must be changed. Refer to the
electrical schematic.
All power and control wiring and ground connections must be in accordance with the National Electrical
Code and local codes. Refer to the equipment serial-tag data for electrical requirements.
A manual electrical disconnect switch should be installed in accordance with local codes and distribution
system. Consult local codes for external disconnect requirements.
NOTE: Input-power requirements: For 3-phase units, only 3 power wires and an earth ground are
required.
The electrical connections are described in the submittal documents included in the Submittal Drawings
on page53.
The following table lists the relevant documents by number and title.
Document Number Title
DPN004802 Electrical Field Connections, 3-ton DX Module
DPN004057 Electrical Field Connections, 4-ton and 5-ton DX Module
DPN004238 4- and 5-ton iCOM Wall-mount Field Connection
DPN004803 3-ton iCOM Wall-mount Field Connection
Table 5.1 Electrical Field-connection Drawings
5 Electrical Connection Requirements 23