SECTION 23 65 00	

		
COOLING TOWERS	

PART 1 - GENERAL	

1.1 RELATED DOCUMENTS	

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.	

1.2 SUMMARY	

A. This Section includes factory assembled and tested, open circuit mechanical induced-draft vertical discharge cooling tower.	

1.3 SUBMITTALS	

A. Product Data: For each type of product indicated. Include rated capacities, pressure drop, performance curves with selected points indicated, furnished specialties, and accessories.	

B. Shop Drawings: Complete set of manufacturer's prints of evaporative equipment assemblies, control panels, sections and elevations, and unit isolation. Include the following:	

1. Assembled unit dimensions.	

2. Weight and load distribution.	

3. Required clearances for maintenance and operation.	

4. Sizes and locations of piping and wiring connections.	

5. Wiring Diagrams: For power, signal, and control wiring. Differentiate between manufacturer installed and field installed wiring.	

C. Operation and Maintenance Data: Each unit to include, operation, and maintenance manual.	

1.4 QUALITY ASSURANCE	

A. Verification of Performance:	

1. The thermal performance shall be certified by the Cooling Technology Institute in accordance with CTI Certification Standard STD-201. Lacking such certification, a field acceptance test shall be conducted within the warranty period in accordance with CTI Acceptance Test Code ATC-105, by a Certified CTI Thermal Testing Agency. The Evaporative Heat Rejection Equipment shall comply with the energy efficiency requirements of ASHRAE Standard 90.1.	

2. Unit Sound Performance ratings shall be tested according to CTI ATC-128 standard. Sound ratings shall not exceed specified ratings.	

B. Unit shall meet or exceed energy efficiency per ASHRAE 90.1	

1.5 WARRANTY	

A. Submit a written warranty executed by the manufacturer, agreeing to repair or replace components of the unit that fail in materials and workmanship within the specified warranty period.	

1. Fan Motor/Drive System: Warranty Period shall be Five (5) years from date of unit shipment from Factory (fan motor(s), fan(s), bearings, mechanical support, sheaves, bushings and belt(s)).	

2. The Entire Unit shall have a comprehensive one (1) year warranty against defects in materials and workmanship from startup, not to exceed eighteen (18) months from shipment of the unit.	

PART 2 - PRODUCTS	

2.1 MANUFACTURERS	

A. Manufacturers: Subject to compliance with requirements, provide cooling towers manufactured by one of the following:	

1. EVAPCO Model CAT 17-814	

2. Approved Substitute	

2.2 THERMAL PERFORMANCE	

A. Each unit shall be capable to cool 1,000.00 GPM of water entering at 95.00° F leaving at 85.00° F at a design wet bulb of 78.00° F.	

2.3 COMPONENTS	

A. Description: Factory assembled and tested, induced draft counter flow cooling tower complete with fan, fill, louvers, accessories and rigging supports	

B. Materials of Construction	

1. All cold water basin components including vertical supports, air inlet louver frames and panels up to rigging seam shall be constructed of heavy gauge mill hot-dip galvanized steel.	

2. Upper Casing, channels and angle supports shall be constructed of heavy gauge mill hot-dip galvanized steel. Fan cowl and guard shall be constructed of galvanized steel. All galvanized steel shall be coated with a minimum of 2.35 ounces of zinc per square foot of area (G-235 Hot-Dip Galvanized Steel designation). During fabrication, all galvanized steel panel edges shall be coated with a 95% pure zinc-rich compound.	

C. Assembly	

1. Unit shall ship assembled except for vertical basin supports, fan motors, and air inlet louvers, which shall be shipped loose in the unit basin. The entire unit shall fit into a standard shipping container for transport.	

D. Fan(s):	

1. Fan(s) shall be high efficiency axial propeller type with aluminum wide chord blade construction. Each fan shall be dynamically balanced and installed in a closely fitted cowl with venturi air inlet for maximum fan efficiency.	

E. Drift Eliminators	

1. Drift eliminators shall be constructed entirely of Polyvinyl Chloride (PVC) in easily handled sections. Design shall incorporate three changes in air direction and limit the water carryover to a maximum of 0.001% of the recirculating water rate.	

F. Water Distribution System	

1. Spray nozzles shall be precision molded ABS, large orifice nozzles utilizing fluidic technology for superior water distribution over the fill media. Nozzles shall be designed to minimize water distribution system maintenance. Spray header and branches shall be Schedule 40 Polyvinyl Chloride (PVC) for corrosion resistance with a steel connection to attach external piping.	

G. Heat Transfer Media	

1. Fill media shall be constructed of Polyvinyl Chloride (PVC) of cross-fluted design and suitable for inlet water temperatures up to 130° F. The bonded block fill shall be bottom supported and suitable as an internal working platform. Fill shall be self-extinguishing, have a flame spread of 5 under A.S.T.M. designation E-84-81a, and shall be resistant to rot, decay and biological attack.	

H. Air Inlet Louvers	

1. The air inlet louver screens shall be constructed from UV inhibited polyvinyl chloride (PVC) and incorporate a framed interlocking design that allows for easy removal of louver screens for access to the entire basin area for maintenance. The louver screens shall have a minimum of two changes in air direction and shall be of a non-planar design to prevent splash-out and block direct sunlight & debris from entering the basin.	

I. Make up Float Valve Assembly	

1. Make up float assembly shall be a mechanical brass valve with an adjustable plastic float.	

J. Pan Strainer	

1. Pan Strainer(s) shall be all Type 304 Stainless Steel construction with large area removable perforated screens.	

2.4 MOTORS AND DRIVES	

A. General requirements for motors are specified in Division 23 Section “Motors”	

B. Fan Motor	

1. Fan motor(s) shall be totally enclosed, ball bearing type electric motor(s) suitable for moist air service. Motor(s) are Premium Efficient, Class F insulated, 1.15 service factor design. Inverter rated per NEMA MG1 Part 31.4.4.2 and suitable for variable torque applications and constant torque speed range with properly sized and adjusted variable frequency drives.	

C. Fan Drive	

1. The fan drive shall be multigroove, solid back V-belt type with QD tapered bushings designed for 150% of the motor nameplate power. The belt material shall be neoprene reinforced with polyester cord and specifically designed for evaporative equipment service. Fan sheave shall be aluminum alloy construction. Belt adjustment shall be accomplished from the exterior of the unit.	

D. Fan Shaft	

1. Fan shaft shall be solid, ground and polished steel. Exposed surface shall be coated with rust preventative.	

E. Fan Shaft Bearings	

1. Fan Shaft Bearings shall be heavy-duty, self-aligning ball type bearings with extended lubrication lines to grease fittings located on access door frame. Bearings shall be designed for a minimum L-10 life of 100,000 hours.	

2.5 MAINTENANCE ACCESS	

A. Fan Section	

1. Access door shall be hinged and located in the fan section for fan drive and water distribution system access. Swing away motor cover shall be hinged for motor access.	

B. Basin Section	

1. Framed removable louver panels shall be on all four (4) sides of the unit for pan and sump access.	

C. Internal Working Platform	

1. Internal working platform shall provide easy access to the fans, belts, motors, sheaves, bearings, all mechanical equipment and complete water distribution system. The fill shall be an acceptable means of accessing these components.