USACE / NAVFAC / AFCESA / NASA UFGS-23 76 00.00 20 (July 2006)
------------------------------
Preparing Activity: NAVFAC Superseding
UFGS-23 76 00.00 20 (April 2006)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 23 76 00.00 20
EVAPORATIVE COOLING SYSTEM
07/06
NOTE: This guide specification covers the requirements for evaporative coolers
including roof curbs on which they are mounted.
Edit this guide specification for project specific requirements by adding, deleting,
or revising text. For bracketed items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in respective project, whether
or not brackets are present.
Comments and suggestions on this guide specification are welcome and should
be directed to the technical proponent of the specification. A listing of technical
proponents, including their organization designation and telephone number, is
on the Internet.
Recommended changes to a UFGS should be submitted as a Criteria Change Request
(CCR).
NOTE: The coolers covered in this specification are intended for use in areas
where climatic conditions generally provide dry-bulb temperatures in excess
of 29 degrees C 85 degrees F and concurrent wet-bulb temperatures below 21 degrees
C 70 degrees F. Moderate success can be expected with wet-bulb temperatures
as high as 24 degrees C 76 degrees F; however, for general practice, use of
the coolers with prevailing wet-bulb temperatures above 22 degrees C 72 degrees
F is not recommended. Conform to DOD 4270.1-M for the selection of evaporative
coolers.
NOTE: The following information shall be shown on the project drawings:
1. Dry-bulb temperature entering and leaving the evaporator coolers.
2. Wet-bulb temperature entering the evaporator cooler.
3. Air quantity and static pressure.
4. Motor rpm, volts, and amperes.
5. Air outlet velocity in m/s or fpm.
PART 1 GENERAL
1.1 REFERENCES
NOTE: This paragraph is used to list the publications cited in the text of
the guide specification. The publications are referred to in the text by basic
designation only and listed in this paragraph by organization, designation,
date, and title.
Use the Reference Wizard's Check Reference feature when you add a RID outside
of the Section's Reference Article to automatically place the reference in the
Reference Article. Also use the Reference Wizard's Check Reference feature
to update the issue dates.
References not used in the text will automatically be deleted from this section
of the project specification when you choose to reconcile references in the
publish print process.
The publications listed below form a part of this specification to the extent referenced. The publications are
referred to within the text by the basic designation only.
[AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS (ASHRAE)ASHRAE 52.2(2007; Addenda B 2008) Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle SizeASHRAE 55(2004; Interpertation 1: 2005; Errata 2006; Interpertation 2:2007; Errata 2007; Addendas a & B 2008) Thermal Environmental Conditions for Human OccupancyASHRAE 62.1(2007; INT 2007; INT 2-15 2008; Errata 2008; Addenda a, b, e, f and h 2008) Ventilation for Acceptable Indoor Air Quality][ASTM INTERNATIONAL (ASTM)ASTM A 123/A 123M(2008) Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel ProductsASTM A 653/A 653M(2008) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip ProcessASTM B 117(2007a) Standing Practice for Operating Salt Spray (Fog) ApparatusASTM D 1654(2008) Evaluation of Painted or Coated Specimens Subjected to Corrosive EnvironmentsASTM D 202(2008) Sampling and Testing Untreated Paper Used for Electrical InsulationASTM D 374(1999; R 2004) Thickness of Solid Electrical InsulationASTM D 374M(1999; R 2005) Thickness of Solid Electrical Insulation (Metric)ASTM E 2129(2005) Standard Practice for Data Collection for Sustainability Assessment of Building Products][NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)NEMA ICS 2(2000; Errata 2002; R 2005; Errata 2006) Standard for Industrial Control and Systems: Controllers, Contractors, and Overload Relays Rated Not More than 2000 Volts AC or 750 Volts DC: Part 8 - Disconnect Devices for Use in Industrial Control EquipmentNEMA ICS 6(1993; R 2006) Standard for Industrial Controls and Systems EnclosuresNEMA MG 1(2007; Errata 2008) Standard for Motors and Generators][NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)NFPA 70(2007; AMD 1 2008) National Electrical Code - 2008 EditionNFPA 90A(2008) Standard for the Installation of Air Conditioning and Ventilating Systems][SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION (SMACNA)SMACNA 1966(2005) HVAC Duct Construction Standards Metal and Flexible][TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY (TAPPI)TAPPI T403 OM(2002) Bursting Strength of PaperTAPPI T404 CM(1992) Tensile Breaking Strength and Elongation of Paper and Paperboard (Using Pendulum-Type Tester)TAPPI T410 OM(2008) Grammage of Paper and Paperboard (Weight Per Unit Area)TAPPI T456 OM(2003; Corrected 2005) Wet Tensile Breaking Strength of Paper and Paperboard ("Wet Tensile Strength")TAPPI T487 PM(1999) Fungus Resistance of Paper and Paperboard]1.2 GENERAL REQUIREMENTS
Section 23 03 00.00 20 BASIC MECHANICAL MATERIALS AND METHODS, with the following additions and modifications.
Provide water treatment and positive water bleed-off for the evaporative cooling system. The color of finished
coat, lubrication, and treatment for fungus resistance shall be the manufacturer's standard. Provide solenoid
valves in water supply lines. Furnish starting switch separated from coolers, integral with the thermostat control.
[Provide manual reset control for motors rated greater than 3/4 kW one hp.] [Provide air filters for air inlets
for rotary-type evaporator coolers.]
1.3 SUBMITTALS
NOTE: Submittals must be limited to those necessary for adequate quality control.
The importance of an item in the project should be one of the primary factors
in determining if a submittal for the item should be required.
A “G” following a submittal item indicates that the submittal requires Government
approval. Some submittals are already marked with a “G”. Only delete an existing
“G” if the submittal item is not complex and can be reviewed through the Contractor’s
Quality Control system. Only add a “G” if the submittal is sufficiently important
or complex in context of the project.
For submittals requiring Government approval on Army projects, a code of up
to three characters within the submittal tags may be used following the "G"
designation to indicate the approving authority. Codes for Army projects using
the Resident Management System (RMS) are: "AE" for Architect-Engineer; "DO"
for District Office (Engineering Division or other organization in the District
Office); "AO" for Area Office; "RO" for Resident Office; and "PO" for Project
Office. Codes following the "G" typically are not used for Navy projects.
Submittal items not designated with a "G" are considered as being for information
only for Army projects and for Contractor Quality Control approval for Navy
projects.
Government approval is required for submittals with a "G" designation; submittals not having a "G" designation
are [for Contractor Quality Control approval.][for information only. When used, a designation following the
"G" designation identifies the office that will review the submittal for the Government.] The following shall
be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-02 Shop Drawings
Evaporative cooling system
SD-03 Product Data
Evaporative coolers
Roof curbs
Vibration isolators
[Local/Regional Materials
Submit documentation indicating distance between manufacturing facility and the project site.
Indicate distance of raw material origin from the project site. Indicate relative dollar value
of local/regional materials to total dollar value of products included in project.]
[Environmental Data]
SD-06 Test Reports
Corrosion protection tests
Cooler efficiency tests
Evaporative coolers tests
SD-10 Operation and Maintenance Data
Evaporative coolers, Data Package 2
Water treatment unit, Data Package 3
Submit in accordance with Section 01 78 23 OPERATION AND MAINTENANCE DATA.
1.4 CORROSION PROTECTION TESTS
Comply with [ASTM A 123/A 123M] [ASTM A 653/A 653M] or protect the equipment with a corrosion-inhibiting coating
or paint system that has proved capable of satisfactorily withstanding corrosion in accordance with ASTM B 117
. Test 125 hours for equipment installed indoors and 500 hours for equipment installed outdoors or subjected
to marine atmosphere. Each specimen shall have a standard scratch as defined in ASTM D 1654.
1.4.1 Corrosion Criteria
Upon completion of exposure, coating or paint shall show no indication of deterioration or loss of adhesion,
indication of rust, or corrosion extending further than 3 mm 1/8 inch on either side of original scratch.
1.4.2 Thickness of Coating
Thickness of coating or paint system on the equipment shall be identical to that on the test specimens with respect
to materials, conditions of application, and dry film thickness.
1.5 LABORATORY TEST
Conduct the test with entering air at 35 degrees C, dry-bulb, plus or minus 2.78 degreees C and a spread between
wet-bulb and dry-bulb temperature of minus 4 degrees C plus or minus 3 degrees C. Show the capacity in liter
per second (L/s) and efficiency. Meet the following requirements:
Evaporative Cooler Minimum Efficiency, Percent
Single Stage 80
Two Stage Indirect Section, 60; Direct Section, 90
T1-T2
Efficiency =__________ x 100 percent
T1-Tw
where: T1 is the entering dry-bulb temperature in degrees C.
T2 is the leaving dry-bulb temperature in degrees C.
Tw is the entering wet-bulb temperature in degrees C.
Conduct the test with entering air at 95 degrees F, dry-bulb, plus or minus 5 degrees F and a spread between
wet-bulb and dry-bulb temperature of 25 degrees F plus or minus 5 degrees F. Show the capacity in cubic feet
per minute (cfm) and efficiency. Meet the following requirements:
Evaporative Cooler Minimum Efficiency, Percent
Single Stage 80
Two Stage Indirect Section, 60; Direct Section, 90
T1-T2
Efficiency =__________ x 100 percent
T1-Tw
where: T1 is the entering dry-bulb temperature in degrees F.
T2 is the leaving dry-bulb temperature in degrees F.
Tw is the entering wet-bulb temperature in degrees F.
1.6 ENVIRONMENTAL REQUIREMENTS
For proper Indoor Environmental Quality, maintain positive pressure within the building. Ventilation shall meet
or exceed ASHRAE 62.1 and all published addenda. Meet or exceed filter media efficiency as tested in accordance
with ASHRAE 52.2. Thermal comfort shall meet or exceed ASHRAE 55.
1.7 SUSTAINABLE DESIGN REQUIREMENTS
1.7.1 Local/Regional Materials
NOTE: Using local materials can help minimize transportation impacts, including
fossil fuel consumption, air pollution, and labor.
Use materials or products extracted, harvested, or recovered, as well as manufactured, within a [500][_____]
mile [800][_____] kilometer radius from the project site, if available from a minimum of three sources.
1.7.2 Environmental Data
NOTE: ASTM E 2129 provides for detailed documentation of the sustainability
aspects of products used in the project. This level of detail may be useful
to the Contractor, Government, building occupants, or the public in assessing
the sustainability of these products.
[Submit Table 1 of ASTM E 2129 for the following products: [_____].]
PART 2 PRODUCTS
2.1 SINGLE-STAGE EVAPORATIVE COOLERS
NOTE: Efficient cooling equipment and components contribute to the following
LEED credits: EA Prerequisite 2; EA1.
NOTE: Single-stage evaporative coolers are not recommended in areas where temperatures
frequently exceed 100 degrees F38 degrees C.
[Drip-type with stationary wetted pad] [Rotary-type] with revolving drum or disk. [Washer (eliminator) type.]
System shall be 60 to 85 percent effective.
2.1.1 Evaporative Media (Limited specie of wood)
Refined cellulose fibers. [Impregnate fibers with copper 8-quino-linolate or other equivalent fungicides.]
[Rotary filters with maximum 3 m/s 600 FPMand 2 1/2 percent by-pass water flow through the rotary assemblies
and minimum 127 mm 5 inch depth of rotary sections.] [Washer media consisting of self-cleaning centrifugal brass
spray nozzles, brass flooding nozzles, [copper] [or] [galvanized steel] water piping, centrifugal water pump,
strainers, and a minimum 24 gage [galvanized steel] [or] [aluminum] eliminator with minimum four surfaces and
three bends in the airflow direction.]
2.1.2 Water Reservoirs
Fabricate tank from minimum 20 gage zinc-coated steel, bronze, or stainless steel, with a capacity of 19 liters
5 gallons water for each 472 L/s of air 1,000 cubic feet of air per minute passing through the cooler section.
Coat the entire water reservoir surfaces with minimum 0.254 mm 10 mils bituminous coating after the fabrication.
2.1.3 Automatic Flush (Electric Dump) Valves and Timers
Provide cast bronze valves with neoprene-diaphram solenoid and timer.
2.2 TWO-STAGE (COMPOUND) EVAPORATIVE COOLERS
NOTE: An indirect-section evaporative cooler is the first stage of cooling,
which lowers both dry-bulb and wet-bulb temperatures of the incoming supply
air. This supply air is then passed through a direct-section evaporative cooler
which provides the second stage of cooling. The first stage of cooling is at
constant humidity ratio, while the second stage is at constant wet-bulb temperature.
An automatic reservoir purges and drains completely during off cycles to prevent
biological growth. This type is suitable for hot-dry climates.
Self-contained, packaged, pre-wired, and factory-fabricated evaporative coolers with indirect and direct sections
for two-stage cooling. System shall be 100 to 115 percent effective.
2.2.1 Indirect Section
Indirect sensible cooler with a complete secondary evaporative cooling system. Include components of heat exchanger,
evaporative media, recirculating pump with suction strainer, sump drain, overflow, automatic fill and level control,
secondary air exhaust fan, and distribution head and internal piping. House all components in a common casing.
2.2.1.1 Heat Exchanger
NOTE: Shell-and-tube design generally achieves 55 to 60 percent efficiency;
and the flat-plate, cross flow air-to-air design generally achieves 65 to 85
percent efficiency. Cooling tower coil design may be the most efficient method
of all three choices, generally used in industrial areas where the outdoor wet
bulb temperature is 7 degrees C 45 degrees F or below. This third design can
maintain space conditions similar to those achieved with mechanical refrigeration.
NOTE: UV-C emitters improve air quality and reduce energy consumption by removing
and inhibiting germicidal growth. Cleaning maintenance costs are also reduced.
a. Shell-And-Tube Design: Fabricate tubes and tube sheets from [galvanized steel] [stainless
steel] [aluminum] [polystyrene] [or] [copper]. Tube interiors shall be bonded with an epoxy
coated crystalline surface or equivalent. Protect tube sheets with a bituminous coating applied
after fabrication. Provide the interior of heat exchanger enclosure with 25 mm one inch thick
neoprene-coated fiberglass or equivalent insulation.
b. Flat Plate, Cross-Flow Air-To-Air, Design: Fabricate the heat exchanger of [aluminum] [stainless
steel] [galvanized steel] [or] [copper] with a water absorbent coating applied to the secondary
or wet air surface.
c. Cooling Tower Coil Design: Transport chilled water from the direct evaporative cooler,
and circulate this chilled water through a cooling coil fabricated of copper tubing expanded
into aluminum fins.
Ultraviolet light C band (UV-C) emitters shall be incorporated downstream of heat exchangers and above drain
pans to control airborne and surface microbial growth and transfer. Applied units must be specifically manufactured
for this purpose. Safety features shall be provided to limit hazard to operating staff. Units shall not produce
ozone. Power output shall be [_____] watts. Power intensity shall be [_____] microwatts per square cm inch.
2.2.1.2 Evaporative Media
Self-cleaning evaporative media capable of withstanding a maximum air face velocity of 3.56 m/s 700 fpm without
moisture carryover. Construct media of refined cellulose fibers impregnated with insoluble anti-rot salts and
rigidifying saturants.
2.2.1.3 Recirculating Pump
Submersible pump with epoxy-coated cast-iron housing, corrosive resistant base and cover, non-clog impeller,
screened intake, and permanently lubricated motor with thermal overload protection.
2.2.1.4 Secondary Air Exhaust Fan
NOTE: Propeller fan wheels usually have two or more single thickness blades
in a single ring enclosure. Forward curved centrifugal fan wheels have small
and curved forward blades in the direction of the wheel's rotation. The wheel
type of such centrifugal fans is often called "squirrel cage wheel." Both fans
run at a relatively low speed to move a given amount of air. Use propeller
fans without attached ductwork; use centrifugal fans with attached ductwork.
a. Propeller Fan: Direct-drive propeller fan with all welded frame and statically-dynamically
balanced aluminum blades. The exterior and interior of the fan shall be epoxy primed prior
to the application of a baked enamel finish. The fan motor shall be totally enclosed with permanently
lubricated ball bearings.
b. Centrifugal Fan: Belt-drive or direct-drive centrifugal fan with forward curved blades.
Construct scrolls, wheels, and inlet cones of [steel] [or] [aluminum] with corrosion resistant
finish. Attach the fan to a welded steel frame designed to support the entire fan and motor
assembly. Select V-belt sheaves based on a minimum of 1.3 times the motor nameplate power.
Provide these sheaves to have critical speed at least 20 percent higher than the maximum operating
speed.
2.2.1.5 Filter Rack
Water resistant permanent frame with 50 mm 2 inch thick disposable fiberglass or equivalent medium.
2.2.1.6 Component Casing
Construct casing of minimum 14 gage galvanized steel panels secured to a welded steel angle frame. Exterior
panels shall be removable to permit access to any interior component. Coat with epoxy on frame members, sump
drains, entire casing bottom and interior wet surfaces. Exterior steel surfaces shall be primed with epoxy and
finished with baked enamel. Terminate all exterior wiring in a weathertight junction box located outside of the
casing. Provide hoisting lug for installation.
2.2.2 Direct Section
NOTE: For two-stage evaporative cooling systems, major manufacturers often
use direct evaporative coolers.
Except as modified, direct evaporative cooler [Drip-type with stationary wetted pad] [Rotary-type] with revolving
drum or disk. [Washer (eliminator type)].
2.2.2.1 Evaporative Media
Refined cellulose fibers. [Impregnate fibers with copper 8-quino linolate.] [Rotary filters with maximum 3 m/s
600 fpm and 2 1/2 percent by-pass water flow through the rotary assemblies and minimum 127 mm 5 inch depth of
rotary sections.] [Washer media consisting of self-cleaning, centrifugal brass spray nozzles, brass flooding
nozzles, [copper] [or] [galvanized steel] water piping, centrifugal water pump, strainers, and a minimum 24 gage
[galvanized steel] [or] [aluminum] eliminator with minimum four surfaces and three bends in the airflow direction.]
2.2.2.2 Water Reservoirs
Fabricate tank from minimum 20 gage zinc-coated steel, bronze, or stainless steel, with a capacity of 19 liters
5 gallons water for each 472 L/s of air 1,000 cubic feet of air per minute passing through the cooler section.
Coat the entire reservoir surfaces with minimum 0.254 mm 10 mils bituminous coating applied after fabrication.
2.2.2.3 Automatic Flush (Electric Dump) Valves and Timers
Provide cast bronze valves with neoprene-diaphragm solenoid and timer.
2.3 FAN PLENUMS
Provide gaskets for plenum covers on all edges which contact sides of sheet-metal plenum with continuous 3 mm
1/8 inch thick butyl-rubber gasket with pressure sensitive backing. Insulate plenum interior, including covers
with duct liner. Provide fresh-air intake hoods with bird screens. Install automatic dampers in the fresh-air
intake hoods.
2.4 BIRD SCREENS, FRESH-AIR INTAKE HOODS, AND DUCTWORK
Section 23 00 00 AIR SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEMS.
2.5 THERMOSTATS, AUTOMATIC DAMPERS, AND DAMPER ACTUATORS
Section 23 09 53.00 20 SPACE TEMPERATURE CONTROL SYSTEMS.
2.6 ROOF CURBS
Provide factory-fabricated sheet-steel structural members. The curbs shall have high load-bearing capacities
attained by a system of internal bulkheads, welded into position at logical intervals along the length of rails.
Provide minimum 100 mm 4 inch cants, 50 by 150 mm 2 by 6 inch factory-installed wood nailers, and fully mitered
end sections. Use welded 18 gage galvanized steel shell, base plate, and counterflashing.
2.7 VIBRATION ISOLATORS
[Factory-fabricated, high static and double deflection type. Mold metal parts in oil-resistant neoprene, with
color codes by type and size for identification of capacity. Provide bottom steel plates with bolt holes for
bolting to equipment bases to prevent movement of equipment.] [Section 22 05 48.00 20 MECHANICAL SOUND VIBRATION
AND SEISMIC CONTROL.]
2.8 PLUMBING
Section 22 00 00 PLUMBING SYSTEMS.
2.9 MOTORS AND MOTOR STARTERS
NOTE: The motor control requirements should be coordinated with the Electrical
Section and will depend on field conditions. The following types of motor starters
should be used as a guide only. When electrical equipment is connected to heavily
loaded, power circuits the starting current may cause excessive voltage drop.
Motor kW Voltage Type Starter
Up to 1/4 120 Manual or automatic
1/4 to 5 1/2 208-230 Across-the-line magnetic
5 1/2 to 11 208-230 Across-the-line magnetic,
part winding or wye-delta
11 to 22 460 Across-the-line magnetic,
part winding or wye-delta
Above 11 208-230 Part winding or wye-delta
Above 22 460 Part winding or wye-delta
Motor hp Voltage Type Starter
Up to 1/4 120 Manual or automatic
1/3 to 7 1/2 208-230 Across-the-line magnetic
7 1/2 to 15 208-230 Across-the-line magnetic,
part winding or wye-delta
15 to 30 460 Across-the-line magnetic,
part winding or wye-delta
Above 15 208-230 Part winding or wye-delta
Above 30 460 Part winding or wye-delta
NEMA MG 1 and NEMA ICS 2 and NEMA ICS 6 with electrical characteristics as indicated. Motors less than 3/4
kW 1 hp shall meet NEMA High Efficiency requirements. Motors 3/4 kW 1 hp and larger shall meet NEMA Premium
Efficiency requirements. Motor shall be [variable speed] [open] [dripproof] [totally-enclosed, [non-ventilated]
[or] [fan-cooled] ] [explosion-proof]. Motor starters shall be [[manual] [magnetic-across-the-line] [reduced-voltage]
[part-winding] [wye-delta] type with [general-purpose] [weather resistant] [watertight] [explosion-proof] enclosure]
[manufacturer's standard].
2.10 WATER TREATMENT UNIT FOR THE EVAPORATIVE COOLING SYSTEM
Provide complete and ready for operation, factory packaged water treatment unit for [chemical][ozone] treatment
of water, as recommended by the manufacturer of evaporative coolers.
2.11 REFINED CELLULOSE FIBERS' REQUIREMENTS FOR EVAPORATIVE MEDIA
Test Requirements Test Method
Basis weight
24 by 36, 500 21.34 kg plus or TAPPI T410 OM
sheets minus 0.5 kg
Mullen 42 minutes TAPPI T403 OM
Caliper 0.14 to 0.15 mm ASTM D 374M,
Method A
Tensile, dry 18 minutes TAPPI T404 CM
Tensile, wet 25 percent of dry TAPPI T456 OM
after 1 minute age
at 110 degrees C
Absorption 19 mm to 28 mm ASTM D 202
Fungus resistance Satisfactory at 2 TAPPI T487 PM
weeks incubation
Test Requirements Test Method
Basis weight
24 by 36, 500 47 lb. plus or TAPPI T410 OM
sheets minus 1 lb.
Mullen 42 minutes TAPPI T403 OM
Caliper 0.0054 to ASTM D 374,
0.0058-inch Method A
Tensile, dry 18 minutes TAPPI T404 CM
Tensile, wet 25 percent of dry TAPPI T456 OM
after 1 minute age
at 230 degrees F
Absorption 12/16 inch to ASTM D 202
18/16 inch
Fungus resistance Satisfactory at 2 TAPPI T487 PM
weeks incubation
PART 3 EXECUTION
3.1 INSTALLATION
Installation of evaporative coolers shall conform with NFPA 90A, SMACNA 1966, recommendations and printed instructions
of the manufacturer, and details and notes indicated. Provide mounting and supporting of thermostats, ducts,
piping, roof curbs, equipment, accessories, and appurtenances, including but not limited to structural supports,
hangers, vibration isolators, stands, clamp and brackets, and access doors. Electric isolation shall be provided
between dissimilar metals for the purpose of minimizing galvanic corrosion. Electrical work shall conform with
NFPA 70 and Division 16, Electrical. Equip electric motor-driven equipment with motor starters, fused-disconnect
switches, and controls. Provide manual or automatic control, protective devices, and control wiring for operations
as indicated.
3.2 FIELD TESTING AND BALANCING
Verify equipment is properly installed, connected, and adjusted. Adjust evaporative coolers to produce air quantities
at the conditions indicated. Use Pitot or electronic instrument to measure air quantities. Set control devices
to control at the points indicated. Lubricate bearings and check the speed and direction of rotation of each
fan. Check the running current of each motor. Furnish water analysis and sufficient chemicals to initially
place the evaporative system in service. [Provide same chemicals used at station's cooling towers.]
3.2.1 Evaporative Coolers Tests
Perform minimum 4-hour cooler efficiency tests of each cooler. Record test data in typed tabulation form, no
less than 2 days before the final tests of entire systems indicating the following:
a. Time, date, and duration of test
b. Dry-bulb temperature entering and leaving the evaporizer coolers
c. Wet-bulb temperature entering the evaporizer cooler
d. Air quantity and static pressure
e. Motor rpm - voltmeter and ammeter readings
f. Air outlet velocity m/s fpm
g. Evaporative cooler-make, model and size
3.2.2 Control Sequences
[As indicated] [Section 23 09 53.00 20 SPACE TEMPERATURE CONTROL SYSTEMS].
3.3 WASTE MANAGEMENT
NOTE: Diverting waste from the landfill contributes to the following LEED credit:
MR2. Coordinate with Section 01572 CONSTRUCTION AND DEMOLITION WASTE MANAGEMENT.
Separate waste in accordance with the Waste Management Plan, placing copper materials in designated areas for
reuse. Close and seal tightly all partly used adhesives and solvents; store protected in a well-ventilated,
fire-safe area at moderate temperature.
3.4 SCHEDULE
Some metric measurements in this section are based on mathematical conversion of inch-pound measurements, and
not on metric measurements commonly agreed on by the manufacturers or other parties. The inch-pound and metric
measurements shown are as follows:
Products Inch-Pound Metric
a. [_____ _____ _____]