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12.0 MAINTENANCE
The Liebert DS product is a single component in the facility heat removal system. The system
includes air distribution (raised floors, duct systems), outdoor heat rejection (condensers, pumps, dry-
coolers, cooling towers, piping, heat rejection fluid, ambient temperature, etc.) and indoor cooling and
humidity loads (equipment load, location, outside air infiltration). Proper application and mainte-
nance of the entire system is critical to the life and reliability of the Liebert DS.
• 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 iCom user manual, SL-18835, for instructions on how to utilize the unit controller to pre-
dict some service maintenance intervals.
• Emerson recommends the use of trained and authorized service personnel, extended service con-
tracts and factory-specified replacement parts. Contact your local Emerson representative.
12.1 Filters
To maximize the performance and reliability of Liebert DS equipment, use only Liebert filters. Con-
tact your local Emerson representative to order replacement filters.
!
WARNING
Risk of electric shock. Can cause injury or death.
Disconnect local and remote power supplies before working within.
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.
Follow all local codes.
!
WARNING
Risk of improper wiring, piping, moving, lifting and handling. Can cause equipment damage,
injury or death.
Only qualified service personnel should work on this equipment.
Read all installation, operating and safety instructions before proceeding.
Read and follow all warnings in this manual
!
CAUTION
Risk of improper filter installation and filter collapse. Can cause equipment damage.
Pleat direction is non-standard. Use only short-pleat filters (see Figure 82). Long-pleat filters
are subject to collapse at high airflows.
Table 53 Filter quantities, downflow units
Unit Size
Filter Size
Width x Length
Filter Quantities
4" Filter Option
Merv 8 or Merv 11
2" Primary / 2" Pre-Filter Option
Merv 11 Primary Filter / Merv 7 Pre-Filter
DS 028, 035, 042
16 x 25
55/5
DS 053, 070, 077 7 7/7
DS 105 9 9/9
Table 54 Filter quantities, upflow units
Upflow Models
Filter Size
Width x Length
Filter Quantities
4" Filter Option Merv 8 or Merv 11
2" Primary/2" Pre-Filter Option
Merv 11 Primary/Merv 7 Pre-Filter
VS025, 035, 042
25 x 20"
44/4
VS053, 070, 077 6 6/6
VS105 8 8/8