Furnish and install as shown on the plans an Evapco Model _________ induced draft counterflow closed circuit cooler.
Each unit shall have the capacity to cool _________ GPM (L/S) of _______ from ______ °F (ºC) to ______ °F (ºC) with a _____ °F (ºC) entering wet bulb temperature.

Basin and Casing
The basin and casing shall be constructed of G-235 (Z-600 Europe) hot-dip galvanized steel for long life and durability. Standard basin accessories shall include overflow, drain, type 304 stainless steel strainers, and brass make-up valve with plastic float.

Direct Drive Models 4’ (1,2 m) Wide
Fan Motor
_________ horsepower (kW) totally enclosed fan cooled fan motor(s), with 1.15 service factor shall be furnished suitable for outdoor service on ________ volts, _________ hertz, and _________ phase.

Drive
The fan shall be mounted on the motor in a direct drive configuration.

Belt Drive Models 8-1/2’ & 17’ (2,6 m & 5,2 m) Wide
Fan Motor
_________ horsepower (kW) totally enclosed fan cooled motors with 1.15 service factor shall be furnished suitable for outdoor service on _________ volts, _________ hertz, and _________ phase. Motor(s) shall be mounted on an adjustable base which is accessible from the outside of the unit for service. A swing away protective cover shall shield the motor and sheave from the weather.

Drive
The fan drive shall be multigroove, solid back V-belt type with taper lock sheaves designed for 150% of the motor nameplate horsepower. The belt material shall be neoprene reinforced with polyester cord and specifically designed for evaporative cooler service. Fan sheave shall be aluminum alloy construction. The fans and the fan sheaves shall be mounted on the shaft with a specially coated bushing to provide maximum corrosion protection. Belt adjustment shall be accomplished from the exterior of the unit. Bearing lube lines shall be extended to the exterior of the unit for easy maintenance.

Belt Drive Models 12’ & 24’ (3,7 m & 7,3 m) Wide
Fan Motor
_________ horsepower (kW) totally enclosed air over ball bearing fan motor(s), with 1.15 service factor shall be furnished suitable for service on _________ volts, _________ hertz, and _________ phase. Motor(s) shall be mounted on an adjustable base which allows the motor to swing to the outside of the unit for servicing.

Drive
The fan drive shall be a multigroove, solid back V-belt type with taper lock sheaves designed for 150% of the motor nameplate horsepower. The belt material shall be neoprene reinforced with polyester cord and specifically designed for evaporative cooler service. Fan and motor sheaves shall be aluminum alloy construction. The fans and fan sheaves shall be mounted on the shaft with a specially coated bushing to provide maximum corrosion protection. Belt adjustment shall be accomplished from the exterior of the unit. Bearing lube lines shall be extended to the exterior of the unit for easy maintenance.

Axial Propeller Fans
Fans shall be heavy duty axial propeller type statically balanced. The fans shall be constructed of aluminum alloy blades, installed in a closely fitted cowl with venturi air inlet. Fan screens shall be galvanized steel mesh and frame, bolted to the fan cowl.

Fan Shaft Bearings
Fan shaft bearings shall be heavy duty self-aligning ball type with grease fittings extended to the outside of the unit. Materials shall be stainless steel balls with chrome steel races and zinc plated housing for corrosion resistance. Bearings shall be designed for a minimum L-10 life of 75,000 hours.

Water Recirculation Pump
The pump(s) shall be a close-coupled, centrifugal type with mechanical seal, installed vertically at the factory to allow free drainage on shut down. _________ horsepower (kW) totally enclosed motor(s) shall be furnished suitable for outdoor service on _________ volts, _________ hertz, and _________ phase.

Heat Transfer Coil
Cooling coil(s) shall be all prime surface steel, encased in a steel framework and hot-dip galvanized after fabrication as a complete assembly. The tubes shall be arranged in a self-spacing, staggered pattern in the direction of airflow for maximum heat transfer efficiency and minimum pressure drop, without the use of additional spacers between the coil tubes. The coil(s) shall be pneumatically tested at 400 psig (2758 kPa), under water.

Water Distribution System
The system shall provide a water flow rate of not less than 6 GPM over each square foot (4 liters per second over each square meter) of unit plan area to ensure proper flooding of the coil. The spray header shall be constructed of schedule 40 polyvinyl chloride pipe for corrosion resistance. All spray branches shall be removable for cleaning. The water shall be distributed over the entire coil surface by precision molded ABS spray nozzles (1-1/4” x 5/16” orifice) (31,8 by 7,9 mm) with internal sludge ring to eliminate clogging. Nozzles shall be threaded into spray header to provide easy removal for maintenance.

Eliminators
The eliminators shall be constructed entirely of inert polyvinyl chloride (PVC) in easily handled sections. The eliminator design shall incorporate three changes in air direction to assure complete removal of all entrained moisture from the discharge air stream. Maximum drift rate shall be less than 0.001% of the circulating water rate.

Louvers
The louvers shall be constructed from polyvinyl chloride (PVC). The louvers shall be mounted in easily removable frames for access to the pan for maintenance. The louvers shall have a minimum of two changes in air direction to prevent splashout and block direct sunlight.

Finish
All basin and casing materials shall be constructed of G-235 (Z-600 Europe) heavy gauge mill hot-dip galvanized steel. During fabrication, all panel edges shall be coated with a 95% pure zinc-rich compound for superior protection against corrosion.