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READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

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[DIVISION 15: MECHANICAL]{.underline}

SECTION 15713 ‑ FLUID COOLERS

USE: Furnishing and installing the fluid cooling system.

**NOTES TO SPECIFIER:**

A. Options within paragraphs are identified by enclosure in brackets;
blank spaces enclosed by brackets \[\_\_\_\_\_\] provide for information
to be inserted, as appropriate, to individual projects.

B. **TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES,** the
specifier must edit (delete, substitute or add to the text). The
remaining paragraphs must be renumbered.

C. DELETE FOR FINAL COPY: Notes to the Specifier, located between lines
of asterisks; all \[brackets\], [underlining]{.underline}, **boldface**,
and *italics*, within the paragraphs; and this page. (Open Reveal Codes
\[alt F3\] to do this accurately.)

D. [To Edit "(Footer B)":]{.underline} (Corel 8). **ENTIRE FOOTER SHOULD
BE BOLDED.** Click in the footer and delete the "Project Name (ftr B)"
text and replace it with the **Name of the Project (upper and lower
case)**. Replace date with current MM/YY (WITHOUT BRACKETS).

E. The Guide Specifications are intended to be continuously reviewed and
revised. User's technical comments are appreciated. Also, other related
or similar specification that are written "from scratch" that could
benefit others, or other questions can be sent to NSTC A/E Group, ST
110, or call (303) 987-6868.

**DRAWING DATA REQUIRED:** Location and detail drawings as needed.

**REQUIRED SPEC MODIFICATIONS:**

[GENERAL NOTES]{.underline}

A. Whenever entire articles, paragraphs or subparagraphs are not
applicable, the articles, paragraphs or subparagraphs should be deleted;
when necessary, reletter or renumber articles, paragraphs or
subparagraphs.

B. THIS GUIDE IS NOT INTENDED AS A SUBSTITUTE FOR READING THE ENTIRE
SECTION.

[TECHNICAL NOTES]{.underline}

A. 1.1B: Select or add applicable specification sections. Do not list
specification sections from Division 15.

B. 1.2: Select or add applicable references.

C. 1.3A: Insert specification title and number.

D. 1.4B: Insert number of copies of the manufacturer\'s descriptive data
required. Normally 5 copies are required. Distribution after review is
normally 1 copy to the COR, 3 copies to the Contractor, and 1 copy to
the project file.

E. 1.4C: Insert number of copies of the manufacturer\'s installation
instructions required. Normally 5 copies are required. Distribution
after review is normally 1 copy to the COR, 3 copies to the Contractor,
and 1 copy to the project file.

F. 1.4D: Insert number of copies of the manufacturer\'s maintenance
instructions required. Normally 5 copies are required. Distribution
after review is normally 1 copy to the COR, 3 copies to the Contractor,
and 1 copy to the project file.

G. 1.4E: Insert number of copies of shop drawings required. Normally 5
copies are required. Distribution after review is normally 1 copy to the
COR, 3 copies to the Contractor, and 1 copy to the project file.

H. 1.6A: Insert number of years required.

I. 2.1A: Select applicable temperature.

J. 2.1D: Select applicable information.

K. 2.1J: Select applicable power requirements.

L. 4.1 and 4.2: When a \"lump sum\" Contract is used, delete the title
PART 4: MEASUREMENT AND PAYMENT, and both articles from this section.
Measurement and payment will be addressed in Part 4 of Section 01010
-Summary of Work.

**REVISIONS OF THIS SECTION:**

CSI format, editorial changes: 12/01

Metric:

Technical Update: 01/91

SECTION 15713

FLUID COOLERS

[PART 1: GENERAL]{.underline}

1.1 SUMMARY:

A. Section Includes: Furnishing and installing a closed circuit
evaporative water cooling tower to be used for rejecting heat from a
building air conditioning and heating system.

1.2 REFERENCES:

A. American Society for Testing and Materials

ASTM B 117‑85 Method of Salt Spray (Fog) Testing

ASTM D 2794‑84 Test Method for Resistance of Organic Coatings to the
Effect of Rapid Reformation (Impact)

1.03 SYSTEM DESCRIPTION:

A. Packaged Unit: The fluid cooler shall be a complete packaged unit
containing all required components for rejecting heat from a closed
circuit \[ethylene glycol‑water\] solution to an evaporative water
airstream. The unit shall contain all required components, including
fans, pumps, motor drivers, piping, water collecting pan, and controls.
The fluid cooler shall be of counterflow blow‑through design. The fan
assemblies shall be built into the pan, with all moving parts
factory‑mounted and aligned. The fluid cooler shall have single side air
entry. The cooling tower is a type whose construction is generally
considered to be that of an industrial quality unit. \[The unit shall be
controlled as specified in Section \[[ ]{.underline}.\]

1.4 SUBMITTALS:

A. General: Submittals shall be according to Section 01300 - Submittals.

B. Manufacturer\'s Literature: Submit \[\_\_\_\_\] copies of the
manufacturer\'s descriptive data for the evaporative water cooling tower
to be used on this project.

C. Installation Instructions: Submit \[\_\_\_\_\] copies of the
manufacturer\'s installation instructions for the evaporative water
cooling tower to be used on this project.

D. Operating and Maintenance Instructions: Submit \[\_\_\_\_\] copies of
the manufacturer\'s operating and maintenance instructions for the
evaporative water cooling tower to be used on this project.

E. Shop Drawings: Submit \[\_\_\_\_\] copies of shop drawings or the
major assemblies and major components of the evaporative water cooling
tower to be used on this project. \[Shop drawings shall show wiring and
controls.\] \[A bill of materials shall be furnished with the shop
drawings.\] Drawings shall be \[same\] \[larger\] scale as the full size
Contract Drawings.

1.5 QUALITY ASSURANCE:

A. Corrosion Protection System: All steel components shall be made from
hot‑dip galvanized steel, with all edges given a protective coat of
zinc‑rich compound. In addition, the final Zinc‑Chromatized Aluminum
finish shall be applied to the units after assembly to provide
additional corrosion protection. All metal parts shall be supplied with
Corrosion Protection System applied in the manufacturer\'s plant by the
manufacturer consisting of:

1\. Hot dip galvanized steel

2\. ab Parts prepared in a four‑step (clean, pretreat, rinse, dry)
process

3\. Electrostatically sprayed thermosetting, hybrid polymer fuse‑bonded
to the hot dip galvanized substrate during a thermally activated curing
stage

4\. Quality assurance inspection program including polymer application
and unit fabrication

B. Assembly: Units (parts) shall be assembled with phenolic‑epoxy
coated, cadmium‑plated, washerhead fasteners.

C. Corrosion Protected Parts Test Requirements: The corrosion protected
parts shall have the following final characteristics:

1\. When \"X\" scribed to the base substrate, it shall be able to
withstand 6,000 hours of 5% salt spray test according to ASTM standard B
117. No blistering or chipping around the intersection of the scribes or
any undercutting or creepage along the scribes, shall occur.

2\. When \"X\" scribed to the base substrate, it shall show no sign of
chemical attack after 6,000 hours exposure in acidic (pH 4) and alkaline
(pH 11) water solutions at 95 degrees F.

3\. Shall not fracture or delaminate after 160 inch pounds direct impact
from a 0.625 inch radius impact tool according to ASTM Method D 2794.

4\. Shall not crack as a result of 6,000 hours of continuous
ultra‑violet exposure, equivalent to 120,000 hours of normal sunlight
radiation.

5\. Shall not show signs of deterioration after minimum of 200 thermal
shock cycles conducted between ‑25 degrees F and 180 degrees F.

6\. Shall show no signs of erosion when exposed continuously for 6,000
hours to high pressure (60 lbs) water jet.

1.6 WARRANTY:

A. Requirements: Furnish a written warranty from the manufacturer
covering the unit according to Section 01700 - Contract Closeout. The
warranty period shall extend for a minimum of \[\_\_\_\_\] years.

[PART 2: PRODUCTS]{.underline}

2.1 EQUIPMENT:

A. Capacity: The fluid cooler shall have a capacity to cool not less
than \[53.0\] GPM of a 40% solution of ethylene glycol‑water from \[102
degrees F to 90 degrees F\] at \[65 degrees F\] wet bulb temperature.
The cooler shall be for indoor operation and shall operate against 0.5
inch water gauge external static pressure.

B. Pan/Fan Section: The combination pan/fan section shall be constructed
heavy gauge hot‑dip galvanized steel. The fans and motors shall be
located in the dry entering airstream to provide greater reliability and
ease of maintenance. Standard pan accessories shall include circular
access doors, large area lift‑out hot‑dip galvanized steel strainer of
anti‑vortexing design, waste water bleed line with valve and brass
make‑up valve with large diameter plastic float arranged for easy
adjustment. An enclosed fan section is required for ductwork and must be
specified when ordering the unit.

C. Fan: The forwardly curved centrifugal fans shall be statically and
dynamically balanced. Fan housing shall have curved inlet rings for
efficient air entry and rectangular discharge cowls shall extend into
the pan to increase fan efficiency and prevent water from entering the
fans. Fans shall be mounted on a steel fan shaft supported by
heavy‑duty, self‑aligning, relubricatable bearings with cast iron
housings. The fan wheels, complete fan housings, the sloping fan panel,
discharge cowls and the bearing supports are to be protected with
Corrosion Protection System.

D. Fan Motor and Drive: A \[3\] hp, drip‑proof ball bearing fan motor
with \[1.15\] service factor shall be furnished. Motors shall be
suitable for outdoor service on \[208 volt, 60 hertz, 3 phase\]
electrical service. Each motor shall be located in a protective
enclosure on an easily adjusted heavy‑duty motor base. V‑belt fan
drivers shall be designed for not less than 150% of motor nameplate
horsepower. Drives and all moving parts shall be protected by removable
hot‑dip galvanized screens and panels.

E. Coil Section: The heat transfer sections of the Industrial Fluid
Coolers shall be encased with hot‑dip galvanized steel panels and the
sections shall be removable from the pan. The Cooler coils shall be all
prime surface steel, tested at 350 psig air pressure under water and
hot‑dip galvanized after fabrication. The coils shall be designated for
low pressure drop with sloping tubes for free drainage of fluid. The
press drop at 53 GPM shall not exceed 0.8 ft water gauge.

F. Water Distribution System: Water shall be distributed uniformly over
the coils at a flow rate of not less than 4.5 gpm/sq ft of coil
cross‑section to ensure complete wetting of the coil at all times. The
system shall consist of Schedule 40 PVC header and spray branches with
plastic distribution nozzles having a minimum opening of 3/4 inch x 5/16
inch. The branches and spray nozzles shall be held in place by snap‑in
rubber grommets providing quick removal of individual nozzles or
complete branches for cleaning or flushing. This installation may
require special order left hand arrangement for water circulation
system. Circulating pump shall be mounted in an easily accessible
location.

G. Water Circulation Pumps: A close‑coupled, bronze fitted centrifugal
pump equipped with a mechanical seal, shall be mounted on the pan and
completely piped to the suction strainer and water distribution system.
It shall be installed vertically so that it will drain freely when the
pan is drained. One‑third hp pump motors shall be furnished for
operation to 115 volt, 60 hertz, 1 phase electrical service.

H. Eliminators: Eliminators shall be constructed of hot‑dip galvanized
steel and be removable in easily handled sections. They shall have a
minimum of three changes in air direction with a hooked leaving edge,
and shall direct discharge away from the fans.

I. Unit Size: Overall dimensions shall not exceed approximately 3 ft x 4
ft with an overall height not exceeding approximately 107 1/2 inches.
The operating weight shall not exceed 2150 lbs. Special cooling coil
circuiting may be available from the manufacturer to reduce unit size.
The Contractor shall be responsible for obtaining certified dimensions
from the manufacturer prior to ordering and verifying that the equipment
can be routed to and installed in the specified location.

J. Cooling Capacity Control: Modulating capacity control dampers are
required to be furnished with the fluid cooler. The cooling capacity
control system shall be furnished and/or recommended by the fluid cooler
manufacturer. The control system shall provide close control of leaving
water temperature during both above freezing and below freezing ambient
temperatures. The damper package shall consist of an airfoil type damper
blade located in the discharge of the fan housing. The control package
shall include transformers, damper operators with linkage and end
switches to shut off fan motors when the dampers reach the closed
position. Wiring shall be factory installed in conduit. A
proportional‑acting temperature controller is required for mounting in
the fluid line leaving the cooler. The damper control system shall
balance the unit capacity cooling with the heat load exactly and not
allow freezing of the water spray under below freezing ambient
conditions. Provide controls which operate on \[24 v, 1 ph, 60 hz\]
power.

K. Electric Water Level Control: A factory‑set electric water level
control system is required.

[PART 3: EXECUTION]{.underline}

3.1 EXAMINATION:

A. Verification of Existing Conditions: Prior to ordering equipment, the
Contractor shall plan and determine the exact equipment routing, e.g.,
how equipment shall enter the building (thru windows, wall openings,
doorways, elevators) and be conveyed into the required location for
operation.

3.2 INSTALLATION:

A. Requirements:

1\. General: Install as close as possible to the location shown on the
drawings.

2\. Support: The unit shall be mounted as recommended in the
manufacturer\'s installation recommendations. Beam size and length shall
be calculated according to manufacturer\'s recommendations.

3\. Piping: All fluid piping must be supported separately from the unit
by pipe hangers or supports. An air vent must be installed at the high
point in the piping to the unit and a drain installed at the low point.
Provide a 2‑inch cu line from pan drain connection (required 2\" gate
valve) to floor drain. A 2‑inch cu overflow line is required between the
overflow connection and the drain line. Provide bleed line as required
by manufacturer.

3.3 FIELD QUALITY CONTROL:

A. Equipment Inspection: The fluid cooler shall be inspected prior to
installation by the Contractor for the purpose of determining that all
applicable requirements of the specification and drawings have been
compiled with concerning the furnished equipment.

B. Installation Inspection: Each subsystem and the overall system shall
be inspected and tested by the Contractor to assure proper HVAC system
operation when the fluid cooler is operated as part of the total HVAC
system.

3.4 ADJUSTING:

A. Requirements: The Contractor shall perform required system
adjustments prior to placing the equipment in operation.

3.5 CLEANING:

A. Requirements: The Contractor shall clean the system prior to placing
the equipment in operation.

3.6 DEMONSTRATION:

A. Requirements: Upon completion of installation and after circuitry has
been energized, the Contractor shall demonstrate capability and
compliance of system with requirements. Malfunctioning units shall be
corrected and retested by the Contractor to demonstrate compliance with
the specifications.

3.7 TRAINING OF GOVERNMENT EMPLOYEES:

A. Requirements: See Section 01700 - Contract Closeout.

[PART 4: MEASUREMENT AND PAYMENT]{.underline}

4.1 METHOD OF MEASUREMENT:

A. Units: The work described in this section will not be measured for
payment.

4.2 BASIS OF PAYMENT:

A. Payment: No direct payment for the work described under this section
will be made. The Contractor shall include consideration for this item
in the bid price for other items of the Contract.

END OF SECTION