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LIEBERT GLYCOL COOLED DIRECT DRIVE DRYCOOLERS <br />0 <br />STANDARD FEATURES <br />COIL Liebert manufactured coil is constructed of copper tubes in a staggered tube pattern. Tubes are expanded into continuous, <br />rippled aluminum type fins. The fins have full depth fin collars completely covering the copper tubes which are connected to <br />heavy wall type L headers. Inlet coil connector tubes pass through relieved holes in the tube sheet for maximum resistance to <br />piping strain and vibration. Coils are factory leak tested at a minimum of 300 PSIG, dehydrated, then filled and sealed with a <br />nitrogen holding charge for shipment. <br />FAN(S) Blades are constructed of zinc plated steel or aluminum with a maximum diameter of 30 inches and secured to the fan shaft <br />by a heavy duty hub with set screw. Fan guards are heavy gauge, close meshed, steel wire with corrosion resistant finish. Fans <br />are factory balanced and tested before shipment. <br />FAN MOTOR(S) Are provided with rain slingers, permanently lubricated bearings, and individual built-in overload protection. Motors <br />are rigidly mounted on die -formed galvanized steel supports. <br />HOUSING The Drycooler housing is constructed of bright aluminum sheet and divided into individual fan sections by full width <br />baffles. Structural support members, including coil support frame, motor, and drive support, are galvanized steel for strength <br />and corrosion resistance. Aluminum legs are provided with rigging holes for hoisting the unit into position. <br />FLUID TEMPERATURE CONTROL SYSTEM (Fan Cycling) Is complete with aquastats and electrical control circuit factory wired in <br />the integral control panel. Aquastats cycle fans to maintain fluid temperature as outdoor air temperature changes. Head <br />pressure is controlled by the fluid regulating valve in the Liebert indoor unit. <br />FAN SPEED CONTROL SYSTEM Is complete with solid state fan speed control transducers operating variable speed fans and is <br />factory wired in the integral control panel. This is available on single fan Drycoolers only. <br />OPTIONAL FEATURES <br />'UNIT DISCONNECT SWITCH A locking disconnect factory installed and wired in enclosed control section (Standard with DSO, DDO <br />& DSF Drycoolers). <br />PUMP CONTROLS Factory wired in the integral control panel. Single power feed to Drycooler supplies power to both Drycooler and <br />pumps (electric service connection). Single pump (DSO/DSF) and dual pump (DDO/DDF) control options are available. <br />DDO/DDF Drycooler keeps one pump in active mode and the other in standby mode. Switchover between pumps activated by <br />factory -supplied pump selector switch or by contact closure on field -installed flow switch. <br />DPN000273 <br />REV 08/07 <br />REV 1 <br />