The Liebert® DSE is a single component in the facility heat removal system. The system includes air distribution (raised
floors, duct systems), outdoor heat rejection (condensers, pumps) and indoor cooling and humidity loads (equipment load,
location, outside air infiltration). Proper application and maintenance of the entire system is critical to the life and reliability
of the thermal-management units.
• Good maintenance practices are essential to minimizing operation costs and maximizing product life.
• Read and follow monthly and semi-annual maintenance schedules included in this manual. These minimum
maintenance intervals may need to be more frequent based on site-specific conditions.
• See the Liebert®iCOM™ user manual, SL-31075, available at www.Vertiv.com, for instructions on using the
controller to predict some service maintenance intervals.
• We recommend the use of trained and authorized service personnel, extended service contracts and factory
specified replacement parts. Contact your Vertiv sales representative.
9.1 Filters
NOTICE
Risk of improper filter installation. Can cause filter collapse and airflow reduction.
To maximize the performance and reliability of the equipment, use only Vertiv filters. Contact your Vertiv representative to
order replacement filters.
Verify that filters are installed and positioned so the airflow direction marked on the filter is the same direction as unit air
flow.
Unit Size Filter Type
Filter Size,
Width x Length x Depth (in/mm)
Quantity
DA250, DA265 MERV 8 or MERV 11
28 X 22 X 4
711 X 559 X 102
15
Table 9.1 Filter Quantity and Type
9.1.1 Replacing the Filters
WARNING! Risk of contact with high speed rotating fan blades. Can cause serious 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 blades have stopped rotating before working in the unit cabinet or on the fan assembly. If
control voltage is applied, the fan motor can restart without warning after a power failure. Do not operate the
unit with any or all cabinet panels removed.
Enter the unit through the service access door, and locate the supply side air filters in front of the heat exchanger. Refer to
DPN005217 in Submittal Drawings.
Document Number Title
DPN005217 Liebert® DSE Filter Replacement DA250, DA265
Table 9.2 Filter Replacement Drawings
Vertiv | Liebert® DSE Thermal Management System Installer/User Guide
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