WARNING! Risk of contact with high-speed, rotating fan blades. Can cause serious personal
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, wait 10 minutes and verify with a voltmeter that power is Off before
working within the unit cabinet, removing the fan guards or servicing the fan speed control, fan
blades or EC fan motors.
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.
WARNING! Risk of electric 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, verify with a voltmeter
that power is Off and wait 10 minutes before working within the fan speed control and the EC
fan electrical enclosures.
WARNING! Risk of heavy condenser falling or tipping over. Can cause property damage,
serious injury or death.
Confirm that all components of the lifting system are rated for the weight of the condenser by
an OSHA Certified rating organization before attempting to lift and/or move the condenser. See
2.2 on page15 throughCondenser and option net weights—Large condensers on page17 for
the condenser weights.
CAUTION: Risk of contact with hot surfaces. Can cause injury.
Fan motors, transformers, piping and other components may become extremely hot during
normal operation. Wear thermally insulated gloves and appropriate protective clothing and
allow time for components to cool when working within the cabinet or electric control
enclosure.
Vertiv | Liebert® MC™ Installer/User Guide | 6
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