Part 1: General

A. General: Furnish and install, ________ factory assembled evaporative condenser(s) of induced draft design with vertical discharge, conforming in all aspects to the specifications and schedules as shown on the plans.

B. Capacity: The evaporative condenser(s) shall be warranted by the manufacturer to have condensing capacity of _____ BTUH (kW) heat rejection, operating with _____ refrigerant at ___ °F(ºC) condensing temperature and ___°F(ºC) entering wet-bulb temperature.

C. Warranty: The manufacturer shall provide a five-year mechanical drive warranty covering the fans, fan shafts, bearings, sheaves, supports, and fan motors. The manufacturer’s standard equipment warranty for the balance of the components shall be for a period of one year from the date of startup or eighteen months from the date of shipment, whichever ends first.

D. Factory Testing: The manufacturer shall be capable of testing the operation of the condenser in the manufacturer’s own test facility. Test facilities shall be capable of simulating design conditions, including but not limited to design wet-bulb, airflow, refrigerant mass flow rate, refrigerant condensing temperature, and total heat rejection.

E. Quality Assurance: The manufacturer shall have a Management System certified by an accredited registrar as complying with the requirements of ISO-9001:2000 to ensure consistent quality of products and services. Manufacturers that are not ISO-9001:2000 certified shall provide an additional one year warranty to the customer at no additional cost.

Part 2: Products

2.01 Evaporative Condenser Materials and Components

A. General: All steel panels and structural elements shall be constructed from heavy-gauge, G-235 (Z700 metric) hot-dip galvanized steel, with cut edges given a protective coating of zinc-rich compound.

Or, for CXV-T Models

A. General: All steel panels and structural elements shall be constructed from heavy-gauge, G-235 (Z700 metric), hot-dip galvanized steel, with cut edges given a protective coating of zinc-rich compound. Casing panels shall be constructed of corrosion resistant, fiberglass, reinforced polyester (FRP).

2.02 Coil Casing Assembly

A. The evaporative condenser shall include a coil casing section consisting of refrigerant condensing coil, spray water distribution system, drift eliminators, and air plenum with fan assemblies as indicated by the manufacturer.

1. The refrigerant condensing coil shall be fabricated of continuous lengths of all prime surface steel at the manufacturer’s own facility, and hot-dip galvanized after fabrication.

a. The refrigerant condensing coil shall be pneumatically tested at 375 psig (2,687 kPa).

b. The refrigerant condensing coil shall be designed for low pressure drop with sloping tubes for free drainage of liquid refrigerant.

c. The refrigerant condensing coil shall be ASME B31.5 compliant and coils shipping into Canada shall be supplied with a CRN.

2. Water shall be distributed evenly over the coil at a minimum flow rate of 10 gpm/ft2 (6.8 lps/m2) to ensure complete wetting of the coil at all times. Large-diameter, non-clog, 360° plastic distribution nozzles shall be spaced across the coil face area in Schedule 40 PVC spray branches. Nozzles shall utilize a two-stage diffusion pattern to provide overlapping, umbrella spray patterns that create multiple intersection points with adjacent nozzles.

a. Nozzles and spray branches shall be observable and accessible for cleaning from the outside of the evaporative condenser during condenser operation without the removal of other components.

b. Spray branches and nozzles shall be held in place by snap-in rubber grommets, allowing quick removal of individual nozzles or complete branches for cleaning or flushing.

3. Removable PVC drift eliminators shall be positioned to prevent moisture from entering the air plenum and incorporate a minimum of three (3) changes in air direction.

4. Fan(s) shall be heavy-duty, axial type with aluminum alloy blades driven by a one-piece, multi-groove neoprene/ polyester belt designed for a minimum of 150% of the motor nameplate horsepower.

a. Fan(s) and shafts shall be supported by heavy-duty, self aligning, grease-packed ball bearings with moisture-proof seals and integral sealer rings, designed for a minimum L10 life of 40,000 hours (280,000 hours average life).

b. Fan and motor sheaves shall be fabricated from corrosion resistant materials.

c. Fan motor(s) shall be totally enclosed air over (TEAO) type with a 1.15 service factor, suitable for ____ volt, ____ phase, ___ Hz electrical service and shall be mounted on an easily adjusted, heavy-duty motor base.

d. The motor shall be furnished with double-sealed, permanently lubricated bearings and special moisture protection on windings, shafts and bearings.

e. Air plenum shall provide a minimum of 48˝ (1220 mm) clearance under the motor base to provide comfortable working space for service personnel.

2.03 Basin Assembly

A. The evaporative condenser shall include a basin assembly consisting of cold water basin with pump assembly, heat transfer section for spray water cooling with integral drift eliminators, and wide spaced air inlet louvers.

1. The cold water basin shall be constructed of heavy-gauge steel panels and structural members. Basin shall include a depressed section with drain/cleanout connection. The basin area under the fill surface shall be sloped toward the depressed section to facilitate cleaning.

OR

1. The cold water basin shall be constructed of heavy-gauge type 304 stainless steel panels and structural members, with all welded seams. The welded stainless steel basin shall be leak tested at the factory. Basin shall include a depressed section with drain/cleanout connection. The basin area under the fill surface shall be sloped toward the depressed section to facilitate cleaning.

2. The cold water basin shall include: a drain/clean-out connection; a steel strainer; a brass make-up valve; overflow connection; and a water recirculation pump assembly.

a. Cold water basin shall be designed so that the strainer, makeup valve and float, and pump assembly are easily accessible without removing any of the unit panels or other components.

b. Lift-out steel strainer shall be supplied with perforated openings sized smaller than the water distribution nozzle orifices and an integral anti-vortexing hood to prevent air entrainment.

c. Water recirculation pump shall be a close-coupled, bronzefitted centrifugal pump equipped with a mechanical seal, mounted on the basin and piped from the suction strainer to the water distribution system.

i. The pump shall be installed with adequate drains so that it may drain freely when the basin is drained.

ii. The pump assembly shall include an integral metering valve and bleed line to control the bleed rate from the pump discharge to the overflow connection.

iii. The pump motor shall be totally enclosed fan cooled (TEFC) type suitable for _____ volt, ____ phase, ______ Hz electrical service.

d. On installations requiring a remote sump, the evaporative condenser shall be modified to accommodate the use of an independent sump and pump for recirculating water (by others).

i. The recirculating water pump, steel strainer, make-up valve, and integral bleed line assemblies shall be omitted from the evaporative condenser scope of supply.

ii. The evaporative condenser shall be supplied with a cold water basin outlet sized and located as indicated on the drawings for gravity drain to the remote sump.

iii. The water distribution system shall have a design operating pressure of 1 psig (108.25 kPa) at the evaporative condenser spray water inlet connection.

3. The heat transfer section shall consist of fill with integral drift eliminators for cooling the spray water leaving the coil to optimize the thermal performance of the evaporative condenser.

a. The fill and integral drift eliminators shall be formed from self-extinguishing (per ASTM-568) polyvinyl choride (PVC) having a flame spread rating of 5 per ASTM E84.

b. The fill and integral drift eliminators shall be impervious to rot, decay, fungus, and biological attack.

4. The air inlet louvers shall be manufactured of wave-formed, fiberglass-reinforced polyester (FRP) widely spaced to minimize air resistance and prevent water splash-out.

2.04 Optional Equipment Specifications

A. Evaporative condenser shall be provided with basin heaters to prevent freezing of the recirculating water when the evaporative condenser is idle.

1. The basin heaters shall be selected to maintain +40°F (4.4°C) basin water temperature at a 0°F (-17.8°C) ambient temperature and 10 mph (16.1 km/hr) wind speed.

2. Basin heaters shall be electric immersion type controlled by a remote thermostat with the sensing bulb located in the basin water.

3. Basin heaters shall be provided with a low water level cutout switch to prevent heater operation unless the heater elements are adequately submerged.

B. The evaporative condenser shall be provided with extended lubrication lines with standard grease fittings for lubricating the fan shaft bearings from the outside base of the condenser.

C. Evaporative condenser shall be supplied with dedicated motors and drives so that each fan can be cycled independently.

D. The evaporative condenser shall be provided with a factory assembled, field-installed external platform with an access ladder and handrails complying with OSHA standards and regulations to provide access to the top of the evaporative condenser.

1. External platform shall have a 24˝ (610 mm) wide non-skid walking surface and 42˝ (1,220 mm) high safety railings.

2. Optional ladder safety cage shall be available to meet OSHA requirements as necessary.

Or, for CXV-T Models

D. The evaporative condenser shall be provided with factory assembled, field installed perimeter safety railings and walking surface above coil air intake to provide access to the top of the evaporative condenser.

E. Evaporative condenser shall be provided with a moveable ladder with fixed ladder supports to provide access to the fan drive system and coil assembly.

F. Evaporative condenser shall be provided with an internal walk way at the access door to facilitate servicing the unit.

G. Evaporative condenser shall be provided with a factory assembled internal working platform with ladder to provide a permanent working surface for maintenance personnel (CXV-193 and larger only).

H. Evaporative condenser shall be provided with the ENERGYMISER ® Fan System, which provides two-single speed fan motors, one sized for full horsepower and load, the other sized for 1/3 the full horsepower and approximately 75% full load for capacity control and stand-by protection from drive or motor failure.

I. Evaporative condenser shall be supplied with a right angle gear drive designed specifically for evaporative condenser service. All gears shall have a minimum service factor of 2.0 based on design fan horsepower. An oil level fill port and sight glass shall be located on the gear drive to facilitate routine inspection and maintenance.

J. BALTIGUARD PLUS™ Fan System: Two single speed fan motors, one sized for load, the other sized for 1/3 of the full load horespower shall be provided in each cell for capacity control and standby protection from drive or motor failure. The manufacturer of the equipment shall suppy controls for the larger motor, a VFD for the smaller motor and factory programmed logic controller to maximize energy saving for off peak load and wet-bulb conditions.