Liebert Precision Cooling System DS - Manual (Page 19)

Pre-Installation Guidelines
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3.4 Connections and System Setup
• Plan the routing of wiring, piping and ductwork to the unit. See Figure 55 and Figures 66
through 79 for unit connection locations.
• Water/glycol and GLYCOOL units utilizing a drycooler may require an optional aquastat setting.
See Tables 58 through 57 aquastat setting guidelines. Applications with the optional stat set-
ting require field piping to be insulated to prevent condensation.
• The unit requires a drain, which must comply with all applicable codes. This drain line may con-
tain boiling water. See 8.1.1 - Condensate Piping—Field-Installed for details.
• Three-phase electrical service is required for all models. Electrical service must conform to
national and local electrical codes. See equipment nameplate for details.
• If seismic requirements apply, consult your local Emerson representative for information about a
seismic-rated floor stand.
3.5 Operating Conditions
• The Liebert DS must be operated in a conditioned space within the operating envelope ASHRAE
recommends for data centers: Maximum temperature of 77°F (25°C) DB and 55% RH or maxi-
mum WB of 65.5°F (18.6°C).
Operating outside this envelope can decrease equipment reliability.
• Return air to the unit must be no cooler than the ASHRAE recommendation of 68°F (20°C) DB
and 40% RH or minimum WB of 54°F (12.2°C) for proper unit operation.
Operating below this can decrease equipment reliability.
Refer to ASHRAE’s publication, “Thermal Guidelines for Data Processing Environments.”