Infrared Humidifier Maintenance; Cleaning Humidifier Pan And Float Switch - Vertiv Liebert CW Series Installer And User Manual

10.4 Infrared Humidifier Maintenance

During normal humidifier operation, deposits of mineral solids will collect in humidifier pan and on the float switch. These
must be cleaned periodically to ensure proper operation. Frequency of cleaning must be locally established since it is
dependent on humidifier usage and local water quality. A spare pan is recommended to reduce maintenance time at unit.
The Liebert® autoflush system can greatly increase the time between cleanings, but does not eliminate the need for
periodic checks and maintenance (see Liebert® iCOM™ user manual SL-31075 for autoflush setup). To help reduce
excessive scaling in locations with difficult water quality, the use of Vapure™ is recommended (contact your local sales
representative).
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.
CAUTION: Risk of contact with extremely hot water and part surfaces. Can cause burn injury.
The infrared humidifier bulbs, metal enclosure, humidifier water, water reservoir pan and drain
tubing are very hot during and shortly after operation. Allow sufficient time for these parts to
cool to a touch-safe temperature before handling. Use extreme caution, and wear appropriate,
OSHA-approved PPE when performing maintenance on the infrared humidifier.

10.4.1 Cleaning Humidifier Pan and Float Switch

Before turning the unit Off:
1. With unit operating, remove call for humidification at the Liebert® iCOM control.
2. Let the blower operate 5 minutes to allow the humidifier and water to cool.
3. If unit has a condensate pump, turn unit OFF at Liebert® iCOM control.
4. Pull out the humidifier standpipe in pan.
5. Inspect the O-ring (replace if necessary).
6. Let the pan drain and condensate pump operate (if applicable).
7. Disconnect power from the unit.
8. Disconnect the drain coupling from the bottom of the pan.
9. Remove the thermostat from the bottom of the pan and the retaining screws from the sides of the pan.
10. Slide the pan out.
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Vertiv | Liebert® CW™Installer/User Guide