10.2.4 Removing EC Fans from Downflow Units
The EC fansinLiebert® CWunits can be removed for easier maintenance or for replacement.
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.
Read these instructions and unit labeling before removing fan modules. The instructions show aLiebert®CWwith a 24-in.
floor stand. Your unit may look slightly different.
Hardware and Tools Required
• 1/2” hex socket and wrench
• Factory-supplied jack, crank and jack support
• Cable tie cutter
• Field-supplied fan removal device capable of supporting fanassembly weight
To remove an EC fan module:
1. Remove panels from the front of the unit.
2. Remove the humidifier pan. You canremove fans without removing the humidifier pan, but removing it makes
fan removal easier, see Figure 11.1 onthe facing page.
Vertiv | Liebert® CW™Installer/User Guide
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