Furnish and install as shown on the plans an EVAPCO Model __________ closed circuit cooler. Each unit shall have the capacity to cool __________ ºF (ºC) __________ from __________ ºF (ºC) to __________ ºF (ºC) with a __________ oF entering wet bulb temperature. Unit height shall not exceed __________.
Basin and Casing
The basin and casing shall be constructed of a G-235 (Z-600 Europe) hot-dip galvanized steel for long life and durability. The heat transfer section shall be removable from the pan to provide easy handling and rigging.
The pan/fan section shall include fans and drives mounted and aligned at the factory. These items shall be located in the dry entering air stream to provide maximum service life and easy maintenance. Standard basin accessories shall include circular access doors, Type 304 stainless steel strainers, wastewater bleed line with adjustable valve and brass make-up valve with an unsinkable foam filled plastic float.
Fans
Fans shall be forwardly curved centrifugal type of hot-dip galvanized construction. The fans shall be factory installed into the pan/fan section, and statically and dynamically balanced for vibration-free operation. Fans shall be mounted on either a solid steel shaft or a hollow steel shaft with forged bearing journals. The fan shaft shall be supported by heavy-duty, self-aligning bearings with cast iron housings and lubrication fittings for maintenance.
Drive
The fan drive shall be V-belt type with taper lock sheaves designed for 150% of the motor nameplate horsepower. Drives are mounted and aligned at the factory.
Fan Motor
__________ HP (kW) TEFC ball bearing fan motor(s) 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.
Heat Transfer Coil
The coil(s) shall be all prime surface steel, encased in steel framework with the entire assembly hot-dip galvanized after fabrication. Coil(s) shall be designed with sloping tubes for free drainage of liquid and tested to 400 P.S.I.G. (2758 kPa) air pressure 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 face 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 and include a threaded end plug for cleaning. The water shall be distributed over the entire coil surface by precision molded ABS spray nozzles (1" x 1/2" orifice) (25,4 by 12,7 mm) with internal sludge ring to eliminate clogging. Nozzles shall be threaded into spray header to provide easy removal for maintenance.
Water Recirculation Pump
The pump(s) shall be a close-coupled, centrifugal type with mechanical seal. __________ HP (kW) TEFC motor shall be furnished suitable for outdoor service on __________ volts, __________ hertz, and __________ phase.
Eliminators
The eliminators shall be constructed entirely of inert polyvinyl chloride (PVC) that has been specially treated to resist ultraviolet light. Assembled in easily handled sections, the eliminator blades shall be spaced on 1 inch (25,4 mm) centers and shall incorporate three changes in air direction to assure removal of entrained moisture from the discharge air stream. They shall have a hooked leaving edge to direct the discharge air away from the fans to minimize recirculation.
Finish
All pan and casing materials shall be constructed of G-235 (Z-600 Europe) heavy gauge mill hot-dip galvanized steel for maximum protection against corrosion. During fabrication, all panel edges shall be coated with a 95% pure zinc-rich compound.
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