Removing Ec Fans From Upflow Units - Vertiv Liebert CW Series Installer And User Manual

10.2.5 Removing EC Fans from Upflow Units

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 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.
WARNING! Risk of extremely heavy fan modules dropping downward suddenly. Can cause
injury or death. Fan modules weigh in excess of 125-lb (56.7-kg) each. Support fan modules
before removing mounting hardware. Use caution to keep body parts out of fan module
pathway of movement during removal. Only properly trained and qualified personnel should
work on this equipment. More than one person may be required to complete the assembly and
installation. Installer(s) must be properly trained and qualified to lift, move and manipulate very
heavy equipment from floor level to the top of the unit.
Wear appropriate, OSHA-approved PPE when moving, lifting, installing, and removing the fan
(s) and plenum. Read and follow the lifting equipment and/or ladder manufacturer's operating
instructions and safety requirements.
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