Filter-Replacement For Upflow Units With Rear Return; Blower Drive System-Ec Fans; Fan Impellers And Bearings - Liebert PX018 Installer's/User's Manual

9.1.3 Filter-replacement for Upflow Units with Rear Return

1. Disconnect power from the unit.
2. Open the front access panel from the floor stand, locate the filter, and slide the filter out the
front of the floor stand.
3. Replace with new filter—install the filter in the proper direction of the airflow.
4. Test the operation of the filter clog switch.
The unit panels must be in place and closed to find this point.
5. Start the blower and turn the switch counterclockwise until the alarm is energized.
6. Turn the adjusting knob one turn clockwise or to the desired filter change point.
9.2 Blower Drive System—EC Fans
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
opening the fan motor electric-connection enclosure. Use only fully-trained and qualified HVAC
technicians to replace or perform maintenance on the EC fans.
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.
CAUTION: Risk of improper moving, lifting and handling. Can cause equipment damage or
injury. Only properly trained and qualified personnel should work on this equipment. Fan
modules weigh in excess of 125-lb (56.7-kg). Use proper lifting techniques and wear
appropriate, OSHA-approved PPE to avoid injury and dropping the fan module during removal.
Equipment used in handling/lifting, and/or installing the fan assembly must meet OSHA
requirements. Use handling/lifting equipment rated for the weight of the fan assembly. Use
ladders rated for the weight of the fan assembly and technicians if used during installation.
Refer to handling/lifting, and/or installation equipment operating manual for manufacturer's
safety requirements and operating procedures.

9.2.1 Fan Impellers and Bearings

Fan impellers should be periodically inspected and any debris removed. Check to ensure that the
impellers can rotate freely and that the fan guards are still properly mounted for sufficient protection
against accidentally contacting the impeller. Bearings used on the units are maintenance-free. Consult
the factory for more information.
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