Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 83
doubt as to what must be done, call Vertiv
™
Services at 800-543-2378 for further instructions. The
UPS is designed for unattended operation, but does require some common sense maintenance.
• Keep good records—Troubleshooting is easier if you maintain historical service records.
• Keep the UPS free of dust and any moisture.
• Keep the UPS cool:
• Battery systems must be kept in the range of 72-77°F (22-25°C) in order to meet design specifications
for capacity and longevity.
• The UPS will reliably meet all performance specifications at temperatures up to 104°F (40°C), and can
be slightly derated for operation at even higher temperatures. However, performance and longevity will
be optimized when the UPS is operated at the same temperature as the batteries.
• Keep connections tight.
• Tighten all connections at installation and at least annually thereafter. (See 8.3.3 - Torque
Requirements).
8.3.1 Record Log
Set up a maintenance log to record scheduled checks and any abnormal conditions.
The log should have space for all metered data including phase readings, alarm messages, UPS
mode of operation, air filter replacement date and observation notes. A second log should be
maintained for the battery module as directed by the battery manufacturer.
Vertiv
™
recommends a periodic walk-through inspection of the UPS and battery rooms to check
for visible and audible indications of problems. Log the inspection, metered parameter indications
and any discrepancies.
8.3.2 Air Filters
The air filters must be inspected and serviced on a regular schedule. The period between
inspections will depend upon environmental conditions. Under normal conditions, the air filters
will require cleaning or replacement approximately every two months.
All Liebert
®
EXM
™
models have replaceable filter elements behind the grille in the front of the unit.
This element can be changed with the UPS operating by opening the outer door. The Liebert
®
EXM
™
’s air filters are washable and reusable. One set of air filters is shipped with each Liebert
®
EXM
™
.
Abnormal or dusty conditions will require more frequent cleaning and replacement of air filters.
Inspect installations in new buildings more often, then extend the inspection period as
experience dictates.
Replacing Air Filters
Installing the two air filter sizes in a Liebert
®
EXM
™
requires only a Phillips screwdriver. Each filter is
held in place by a bracket on either side of each filter. Refer to 8.3.2 - Air Filters for details about
filter maintenance.
To replace a filter:
1. Open the UPS front door and locate the filters on the back side of the front door (see Figure 35).
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.
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