4 ELECTRICAL CONNECTIONS
Line voltage electrical service is required for all models. Refer to the equipment’s nameplate regarding
wire size and circuit protection requirements. Electrical service must conform to national and local
electrical codes. Refer to Figure 4.8 on page50 for electrical service entrances into unit. Refer to
electrical schematic when making connections.
A manual electrical disconnect switch should be installed in accordance with local codes. Consult local
codes for external disconnect requirements.
All internal wiring is completed at the factory.
WARNING! Risk of electrical shock. Can cause injury or death.
The fan speed control and the EC fan electrical enclosures may contain a stored electrical
charge. Open all local and remote electric power disconnect switches, wait 10 minutes and verify
with a voltmeter that power is Off before working within the fan speed control and the EC fan
electrical enclosures.
The LiebertMC contains lethal voltage in some circuits. The line side of the disconnect remains
energized when the condenser unit disconnect is switched to the Off position.
Use a voltmeter to verify that the line-side electrical power is Off before making any electrical
connections or performing any electrical and/or mechanical service and/or maintenance
operations.
WARNING! Risk of contact with high-speed, rotating fan blades. Can cause serious injury or
death.
Fan blades can automatically start rotating without warning at any time during a cooling cycle
or after power is restored after a power failure. Open all local and remote electric power supply
disconnect switches and verify with a voltmeter that the power is Off and that the fan blades
have stopped rotating before working within the cabinet or servicing fan motors.
Each unit is shipped from the factory with all internal wiring completed. Refer to the electrical
schematic supplied with the condenser when making line voltage supply, low-voltage indoor
unit interlock and any low-voltage alarm connections. All wiring must be done in accordance
with all applicable local, state and national electrical codes.
NOTE: Installation and service of this equipment should be done only by properly trained and qualified
personnel who have been specially trained in the installation of air conditioning equipment.
NOTE: Use copper wiring only. Make sure that all connections are tightened to the proper torque
mentioned on the component.
Vertiv | Liebert® MC™ Installer/User Guide | 39
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