EC-fan Alarm Contact Tests
Check the alarm contact at KL2 to determine if there are any fault conditions present.
Condition No Fault Condition Fault Condition
NO - COM Open Closed
NC - COM Closed Open
NOTE: The table refers to conditions while the motor is actively energized. When the motor is de-
energized, it will be in a fault condition.
• Check EC Control to determine the fault condition.
10.2.4 Removing EC Fans from Downflow Units
The EC fans in Liebert® DSE units can be removed for easier maintenance or for replacement.
WARNING! Risk of electric shock and contact with high speed rotating fan 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 fan blades have stopped rotating before working
within the unit cabinet.
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 repositioning fan modules. The instructions show
aLiebert®DSE with 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 fan assembly weight
To remove an EC fan module:
1. Remove panels from the front of the unit.
2. Remove the humidifier pan. You can remove fans without removing the humidifier pan, but
removing it makes fan removal easier, see Figure 10.3 on the facing page.
Vertiv | Liebert® DSE™ Installer/User Guide
60
To Next Page
Loading...
