2.2 Product Description and Features
The Liebert® Air-cooled, Direct-drive Drycooler is a low-profile, direct-drive propeller fan-type air-cooled unit. Constructed
with an aluminum cabinet and a copper-tube aluminum fin coil, the unit is quiet and corrosion resistant. All electrical
connections and controls are enclosed in an integral NEMA 3R rated electrical panel section of the drycooler.
Figure 2.1 Liebert® Three Fan Drycooler
2.2.1 Control Options
Fan Speed—DSF, DDF
Available only on single-fan standard drycoolers with integral pump controls. Fan speed control provides an infinite number
of speed variations on specially designed, single-phase, permanent split capacitor motor, by monitoring leaving fluid
temperature.
Fan speed control provides air delivery in direct proportion to heat rejection requirements of the system. The control is
adjustable to maintain the temperature of the fluid leaving the drycooler. Either of two temperature ranges can be field-
selected: 30 to 60°F (-1 to 16°C) for GLYCOOL
™
applications or 70 to 100°F (21 to 38°C) for glycol applications.
Vertiv | Liebert® Drycooler Installer/User Guide
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