User Guide

Operation
111 Liebert
®
APM
™
10.17 Replacing Dust Filters
Installing the two dust filter sizes in a Liebert APM requires only a Phillips screwdriver. Each filter is
held in place by a bracket on either side of each filter. Each UPS is shipped from the factory with two
sets of washable and reusable dust filters. Refer to 12.3.2 - Air Filters for details about filter
maintenance.
To replace each filter:
1. Open the UPS front door and locate the filters on the back side of the front door (see Figure 83).
2. Remove one bracket and loosen the screw on the second bracket. The second bracket need not be
removed.
3. Remove the dust filter to be replaced.
4. Insert the clean filter.
5. Reinstall the bracket, tightening the screw securely.
6. Tighten the screw on the second bracket.
Figure 83 Dust filter replacement