User manual

Pre-Installation Guidelines
9Liebert
®
DS
™
3.4 Connections and System Setup
• Plan the routing of wiring, piping and ductwork to the unit. See Figures 61 and 62 and
Figures 77 through 97 for unit connection locations.
• Water/glycol and GLYCOOL units utilizing a drycooler may require an optional aquastat setting.
See Tables 64 through 67 for aquastat setting guidelines. Applications with the optional stat
setting 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
contain boiling water. See 9.1.1 - 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
3.5.1 Cooling, Humidification and Dehumidification
The Liebert DS must be operated in a conditioned space within the operating envelope ASHRAE
recommends for data centers: Maximum dew point of 59°F (15°C).
Operating outside this envelope can decrease equipment reliability.
Return air to the Liebert DS 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.”
3.5.2 Heating
The Liebert DS is qualified for heating-only operation at temperatures not exceeding 80°F (27°C).
NOTE
Seal openings around piping and electrical connection to prevent air leakage. Failure to do so
could reduce the unit’s cooling performance.