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11.3 Replacing the Condenser Fan
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 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 electric shock. Can cause serious injury or death. Open all local and remote electric power
supply disconnect switches and verify with a voltmeter that power is off before working within the fan motor
electric connection enclosures. Fan motor controls can maintain an electric charge for 10 minutes after power
is disconnected. Wait 10 minutes after power is verified as off before working within the fan electric
control/connection enclosures. Use only fully trained and qualified HVAC technicians to perform
maintenance on the fans.
WARNING! Risk of contact with high speed rotating fan blades. Can cause serious injury or death. Open all
local and remote electric power supply disconnect switches, verify with a voltmeter that power is off, and
verify that all fan blades have stopped rotating before working in the unit cabinet or on the fan assembly. If
control voltage is applied, the fan motor can restart without warning after a power failure. Do not operate the
unit with any or all cabinet panels removed.
CAUTION: Risk of contact with hot surfaces. Can cause injury. The electronics housing, humidifier
components, compressor, refrigerant discharge lines, fan motor, and some electrical components are
extremely hot during unit operation. Allow sufficient time for them to cool to a touch safe temperature before
working within the unit cabinet. Use extreme caution and wear appropriate, OSHA approved PPE when
working on or near hot components.
CAUTION: Risk of improper moving, lifting and handling. Can cause equipment damage or injury. Only
properly trained and qualified personnel should work on this equipment. Condenser fan modules for MCL
models weigh in excess of 92 lb (40.8 kg) each and fan modules for MCS and MCM models weigh in excess of
40 lb (18.1 kg) each. Use proper lifting techniques and wear appropriate, OSHA approved PPE to avoid injury
and dropping the fan module during removal. Equipment used in handling/lifting, and/or installing the fan
assembly must meet OSHA requirements. Use handling/lifting equipment rated for the weight of the fan
assembly. Use ladders rated for the weight of the fan assembly and technicians if used during installation.
Refer to handling/lifting, and/or installation equipment operating manual for manufacturer's safety
requirements and operating procedures.
Vertiv | Liebert® MC Installer/User Guide
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