Liebert 60 HZ Guide Specifications, General, Coil, Casing, Fans, Fan Motors, Quiet-LineMotors

GUIDE SPECIFICATIONS

Standard Features for Direct Drive Propeller Fan Drycoolers

Furnish and install Liebert Model

________ Air-Cooled Drycoolers,

arranged for vertical air flow. Dry- coolers shall be draw-through design and shall perform in accor- dance with the schedule.

General

Each drycooler shall consist of cas- ing, drycooler coil, propeller fans direct-driven by individual fan motors, fan guards, and mounting legs.

Fan motors shall be furnished for operation on a _______ V, ____PH,

______ Hz power supply.

Coil

The drycooler coil shall be con- structed on copper tubes on a stag- gered tube pattern. Tubes shall be expanded into continuous, rippled aluminum fins. The fins shall have full-depth fin collars completely covering the copper tube. Copper tubes shall be connected to heavy wall type “L” headers, inlet coil connector tubes shall pass through relieved holes in the tube sheet, for maximum resistance to piping strain and vibration.

Coils shall be factory leak-tested at 300 PSIG (minimum) dehydrated, evacuated and sealed.

Casing

The drycooler casing shall be con- structed of bright aluminum sheet. Casing shall be divided into individual fan sections by full width baffles. Structural support members, including coil support frame, motor and drive support shall be galvanized steel for strength and corrosion resis- tance. Aluminum legs with rig- ging holes shall be provided for hoisting the unit into position.

Fans

Fans shall have zinc plated steel or aluminum blades. Fan shall be secured to fan shaft by means of a heavy-duty keyed hub and dual set screws. Fan diameter shall be 30" or less. Fans shall be factory- balanced and run before ship- ment.

Fan guards shall be heavy gauge, close-meshed, steel wire, with cor- rosion resistant finish.

Fan Motors

Fan motors shall be equipped with rain slingers and perma- nently sealed ball bearings.

Motors shall include built-in over- load protection. Motors shall be rigidly mounted on die-formed galvanized steel supports.

Quiet-Line Motors

Fan motors shall be 12-pole,

570 rpm, equipped with rain shields and permanently sealed ball bearings. Motors shall include built-in overload protec- tion. Motors shall be rigidly mounted on die-formed galva- nized steel supports.

Electrical Control

All electrical connections (and electrical low ambient control options) shall be provided in weatherproof enclosure. The enclose shall be integral with the drycooler for pleasing appearance as well as functional protection.

The base model (DNC) shall have the motor(s) factory wired to a three phase power block in the electrical enclosure. Main electri- cal control model (DNL) provides magnetic contactor and control voltage for remote starting of the drycooler.

The drycooler shall be provided with optional disconnect switch mounted and wired.

Fan cycling model (DNT) shall be used to control leaving fluid tem- perature by cycling fans in one or two steps. The 24 volt control cir- cuit furnished, consists of control transformer, fan contactor(s) and temperature controls) as speci- fied.

Fan cycling with pump control model (DSO)-single pump, (DDO)- dual pump shall have the features as the fan cycling model plus starter(s) for the pump(s) and a built-in disconnect switch.

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