Vertiv Liebert MCM080 - 4.1 Line Voltage Wiring

4.1 Line Voltage Wiring
WARNING! Risk of electrical fire and short circuit. Can cause property damage, injury or death.
Select and install the line side electrical supply wire and overcurrent protection device(s)
according to the specifications on the unit nameplate(s), per the instructions in this manual
and according to the applicable national, state and local code requirements. Use copper
conductors only.
Verify that all electrical connections are tight. Unit-specific wiring diagrams are provided on
each unit.
NOTE: The LiebertMC Condenser is designed to operate with Wye-connected power with a solidly
grounded neutral. It will not operate properly with Wye-connected power with high-resistance (or
impedance) ground or with delta-connected power. Refer to Wye- vs. Delta-Connected Power Supply
on page42.
Condenser-rated voltage should be verified with available power supply before installation. Refer to the
unit’s electrical schematic and serial tag for specific electrical requirements.
Liebert MC condenser power connections are provided for three-phase wires and 1 earth ground wire.
Line voltage electrical service is required for all condensers at the location of the condenser. The voltage
supply to the condenser may not be the same voltage supply as required by the indoor unit. Consider
using a UPS on both data center cooling units and Liebert MC condensers to maintain uninterrupted
cooling capability. Refer to the unit’s serial tag for specific condenser electrical requirements. A unit
disconnect is standard. However, a site disconnect may be required by local code to isolate the unit for
maintenance. Route the supply power to the site disconnect switch and then to the unit. Route the
conduit to the knockout provided in the bottom right end of the electrical control enclosure. Connect the
earth ground wire lead to the marked earth ground connection terminal provided near the factory-
installed disconnect switch (see Figure 4.8 on page50).
NOTE: Liebert Lee-Temp™ kits require a separate line voltage electrical supply for the heated receivers.
See Table 4.2 on the facing page for power requirements.
Model Voltage FLA WSA OPD
Small Platform
MCS028
208/230V 3.0 3.8 15
380V 1.4 1.8 15
460V 1.4 1.8 15
575V 1.2 1.5 15
MCS056
208/230V 6.0 6.8 15
380V 2.8 3.3 15
460V 2.8 3.3 15
575V 2.3 2.8 15
Medium Platform
Table 4.1 Electrical data, three-phase, 60Hz condenser, premium models
Vertiv | Liebert® MC™ Installer/User Guide | 40