8.8 Replacing the Condenser Fan
Source: INST-9168, Rev. 3
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 component 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 electric control/connection enclosures.
WARNING! Risk of contact with high-speed, rotating fan impeller blades. Can cause 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 impellers have stopped rotating before
working in the unit cabinet.
CAUTION: Risk of contact with hot surfaces. Can cause burn injury. The EC fans are extremely
hot during operation. Allow sufficient time for them to cool to a touch-safe temperature before
handling. Use extreme caution and wear appropriate, OSHA-approved PPE when replacing or
performing maintenance on the EC fans.
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 weigh in excess of 250lb(113.4kg) and evaporator fan modules weigh in excess of
125lb (57kg). 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.
NOTE: If at any time a parameter is entered and the condenser display does not show 888 or if the
display shows Err, re-enter the parameter. If the display still shows Err after ENT is pressed, power
cycle the control board by unplugging P24, waiting 15 seconds and plugging P24 back in. Contact the
factory if the parameter still displays Err after ENT is pressed.
8 Maintenance 35
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