Replacing Ec Fans In Upflow Models - Liebert PX018 Installer's/User's Manual

9.2.5 Replacing EC Fans in Upflow Models

The EC-fan modules are removable for easier maintenance and replacement.
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,
OHSA-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 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.
WARNING! Risk of very heavy fan module dropping downward suddenly. Can cause injury or
death. Only properly trained and qualified personnel should work on this equipment. The fan
module weighs approximately 100 lb. (45.4 kg).
CAUTION: Risk of contact with hot surfaces. Can cause burn injury. The EC fans, electronics
housing, humidifier pan and water contained within 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.
To replace the fan(s):
1. Turn off the unit by touching "Turn Unit Off" in the iCOM menu and confirm in next screen by
touching "Turn Unit Off."
2. Allow the unit to shut down. Once shutdown is complete, turn the main electrical disconnect
switch to the Off position.
3. Open the front of the unit.
Removing the side panels will assist in replacing the fan, but it is not necessary.
4. Remove the high- and low-voltage wiring connections to the fan.
5. Remove the 4 bolts that secure the fan assembly to the unit. These bolts are front-accessible,
with 2 on the left side and 2 on the right side. The bolts on one side are shown in Figure 9.5 on
the next page.
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