\* \* \* \* \* \* \* \* \* \*

READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

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[DIVISION 15: MECHANICAL]{.underline}

SECTION 15855 ‑ AIR HANDLING UNITS WITH COILS

USE: Furnishing and installing air handling units and related
appurtenances used for air conditioning.

**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:**

**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. 1.3B: 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.

D. 1.3C: 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.

E. 1.3D: 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.

F. 1.3E: 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.

G. 1.3F: Insert number of copies of performance curves 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. 2.2A: Select applicable words.

I. 2.2B: Select applicable words.

J. 2.2C: Insert applicable information.

K. 2.2D: Insert applicable information.

L. 2.2E: Insert applicable information.

M. 2.2F: Insert applicable information.

N. 2.2G: Insert applicable information.

O. 2.4B: Select applicable words.

P. 2.5A: Select applicable words.

Q. 2.9A: Select applicable phrase.

R. 3.3A: Complete Schedule.

S. 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 15855

AIR HANDLING UNITS WITH COILS

[PART 1: GENERAL]{.underline}

1.1 SUMMARY:

A. Section Includes: Furnishing and installing air handling units and
related appurtenances used for air conditioning purposes.

1.2 REFERENCES:

A. ab Air Conditioning and Refrigeration Institute:

ARI 430‑89 Central Station Air-Handling Units

B. ab American Society of Heating, Refrigeration and Air Conditioning
Engineers:

ASHRAE 51‑85 Laboratory Method of Testing Fans for Rating (AMCA Standard
210‑85)

ASHRAE 52‑76 Testing Air‑Cleaning Devices Used in General Ventilation
for Removing Particulate Matter

C. Underwriters\' Laboratories, Inc.:

UL 900‑87 Test Performance of Air Filter Units

1.3 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 air handling unit to be used on
this project.

C. Installation Instructions: Submit \[\_\_\_\_\] copies of the
manufacturer\'s installation instructions for the air handling unit to
be used on this project.

D. Maintenance Instructions: Submit \[\_\_\_\_\] copies of the
manufacturer\'s maintenance instructions for the air handling unit to be
used on this project.

E. Shop Drawings: Submit \[\_\_\_\_\] copies of shop drawings on the air
handling unit to be used on this project. A bill of materials shall be
furnished with the shop drawings. Drawings shall be \[same\] \[larger\]
scale as the full size Contract Drawings.

F. Performance Data: Submit \[\_\_\_\_\] copies of curves showing the
performance characteristics of the fans with system operating point
plotted on the curves to be used on this project.

1.4 QUALITY ASSURANCE:

A. Certification Requirements: Fans shall bear an Air Movement and
Control Association (AMCA) certified rating seal.

PART 2: PRODUCTS

2.1 GENERAL:

A. Components: Provide and install items as listed in schedule at end of
this section, location as indicated on drawings, complete in all
respects to function as intended.

B. Filters: Select size, NBS test efficiency, initial and final
resistance of filters to agree with types specified. Filter media shall
be UL Class I or Class II rated.

C. Coils: Provide number of tube rows, air and water pressure drops, and
other features such as cleanability, drainability, same or opposite end
connections, support, and venting of coils to match type specified.

2.2 TYPE AND PERFORMANCE:

A. Type: Provide \[draw‑thru\] \[blow‑thru\] type air handling unit of
unitary design suitable for \[low\] \[medium\] \[high\] pressure
operation.

B. Components; Provide fan or fan and coil section plus accessories,
including \[heating coil\] \[mixing box section\] \[filter section\]
\[face and bypass damper section\] \[multi‑zone damper section\]
\[sprayed coil dehumidifier section\] \[cooling coil section\] and
\[humidifier\].

C. Fan: \[[ ]{.underline}\] cu ft/min supply air at \[[ ]{.underline}\]
inch w.g. external static pressure with \[[ ]{.underline}\] hp motor.

D. Hot Water Heating Coil: Size \[[ ]{.underline}\] \[[ ]{.underline}\]
row, capacity \[[ ]{.underline}\] Btu/hr air temperature \[[
]{.underline}\] degrees F DB leaving, when supplied with \[[
]{.underline}\] gal/min water, entering at \[[ ]{.underline}\] degrees F
and leaving at \[[ ]{.underline}\] degrees F. Air S.P. drop \[[
]{.underline}\] inch w.g. and water pressure drop \[[ ]{.underline}\]
ft.

E. Steam Heating Coil: Size \[[ ]{.underline}\] \[[ ]{.underline}\] row
capacity \[[ ]{.underline}\] Btu/hr, air temperature \[[ ]{.underline}\]
degrees F DB entering and \[[ ]{.underline}\] degrees F DB leaving, when
supplied with \[[ ]{.underline}\] lb/hr of \[[ ]{.underline}\] psi
steam, air S.P. drop \[[ ]{.underline}\] inch w.g.

F. Water Cooling Coil: Size \[[ ]{.underline}\] \[[ ]{.underline}\] row,
capacity \[[ ]{.underline}\] Btu/hr, air temperature \[[ ]{.underline}\]
degrees F DB and \[[ ]{.underline}\] degrees F WB entering and \[[
]{.underline}\] degrees F DB and \[[ ]{.underline}\] degrees F WB
leaving, when supplied with \[[ ]{.underline}\] gal/min water, entering
at \[[ ]{.underline}\] degrees F and leaving at \[[ ]{.underline}\]
degrees F, air S.P. drop \[[ ]{.underline}\] inch w.g. and water
pressure drop \[[ ]{.underline}\] ft.

G. Refrigerant Cooling Coil: Size \[[ ]{.underline}\] \[[
]{.underline}\] row, capacity \[[ ]{.underline}\] Btu/hr, air
temperature \[[ ]{.underline}\] degrees F DB and \[[ ]{.underline}\]
degrees F WB entering and \[[ ]{.underline}\] degrees F DB and \[[
]{.underline}\] degrees F WB leaving when supplied with R‑22 refrigerant
at \[[ ]{.underline}\] degrees F saturated suction temperature, air S.P.
drop \[[ ]{.underline}\] inch w.g.

2.3 CASING:

A. Mounting: Mount equipment and support exterior steel panels from
structural steel frame. Reinforce panels.

B. Access Doors: Provide hinged access doors or removable panels for
access to sections and components requiring servicing. Minimum size 18 x
18 inch. Provide fasteners and gasket seals.

C. Finish: Steel finished in baked enamel primer followed by exterior
application of enamel. Construct outdoor units of galvanized steel. Weld
or bolt and seal seams.

D. Drain Pans: Fabricate drain pans from piece of single galvanized
steel with welded corners. Provide drain pans under coils. Units with
sprayed coil dehumidifier section with drain pan under entire fan
section to collect water carried over from coil or humidifier.

E. Mounting Curb: Provide galvanized steel roof mounting curb with wood
nailing strip.

2.4 INSULATION:

A. Panels: Insulate unit panels with 1 inch thick neoprene coated glass
fiber insulation, \"K\" value at 75 degrees F (42 degrees C) maximum
0.26 Btu/in/sq ft/degrees F/hr (.037 Watts/meter degrees K).

B. Other: Insulate the \[fan section\] \[fan damper section\] \[face and
bypass damper section\] \[filter section\] \[sprayed coil dehumidifier
section\] \[mixing section\] \[coil section\].

2.5 FAN:

A. Type: \[Forward curved,\] \[Backward inclined,\] \[Air foil,\] double
width, double inlet, centrifugal type with multi‑blade wheel statically
and dynamically balanced.

B. Bearings: Provide self‑aligning ball bearings. Extend lubrication
fittings to exterior of fan casing.

C. Sheaves: Provide variable sheaves for motors 15 hp (11.2 kW) and
smaller and fixed sheaves for 20 hp (14.9 kW) and larger.

D. Vanes: Provide variable inlet vanes.

E. Mounting: On outdoor units, mount fan motors within casing.

2.6 MULTIZONE DAMPERS:

A. Type: Provide 18‑gauge interlocking steel dampers on steel rods
supported in nylon bearings. Mount hot and cold deck dampers at right
angles. Fully gasket dampers.

2.7 FACE AND BYPASS DAMPERS:

A. Type: Provide opposed blade type steel dampers mounted on steel rods
supported in nylon bearings.

B. Area: Make face damper area equal to coil size.

2.8 FILTER:

A. Media: Two‑inch thick glass fiber blanket, factory‑sprayed with
flameproof, non‑drip, non‑volatile adhesive.

B. Holding Frames: Eighteen‑gauge galvanized steel frame with expanded
metal grid on leaving air side and steel rod grid on entering air side,
hinged with pull and retaining handles.

C. Arrangement: Flat or angle filter section. Limit filter velocity,
based on gross area, to less than 400 ft/min. Provide access doors both
sides, minimum size 18 x 18 inch.

2.9 MIXING BOX:

A. Dampers: Casing box with two sets of opposed blade steel dampers
mounted on steel shafts supported in nylon bearings. Arrange dampers for
mixing of air streams \[with damper blades positioned across the short
air opening dimension\].

2.10 COILS:

A. Enclosure: Enclose coils in coil section with headers and U‑bends
fully contained within the casing.

B. Capacity: Refer to Section 15790 ‑ Air Coils for specifications and
capacity of coils.

2.11 SPRAYED COIL DEHUMIDIFIER:

A. Components: Provide unit complete with pump and spray piping. Provide
glass or clear plastic inspection panels in casing.

B. Capacity: Refer to Section 15845 ‑ Energy Recovery Units for
specifications and capacity of unit.

2.12 HUMIDIFIERS:

A. Spray Type: Brass, cleanable, atomizing water spray nozzle mounted on
galvanized pipe, equipped with strainer.

B. Steam Grid: Steel pipe with evenly spaced orifices wrapped with
asbestos.

C. Steam Pan: Water pan \[of stainless steel\] with submerged copper
tube steam heating coil and float controlled water make‑up valve.

2.13 VIBRATION ISOLATORS:

A. Location: Provide vibration isolators as shown on the drawings.

B. Type: Refer to Section 15241 ‑ Vibration Isolation for type of
isolators.

2.14 FABRICATION:

A. Low and Medium Pressure Units: Assemble low and medium pressure units
by bolting sections together to make single unit.

B. High Pressure Units: Assemble high pressure units by bolting sections
together except for fan section. Isolate fan section with flexible duct
connections.

PART 3: EXECUTION

3.1 INSTALLATION:

A. Vibration Isolation: Install unit on vibration isolators.

B. Manufacturer\'s Instructions: Install items according to
manufacturer\'s instructions.

C. Flexible Connections: Provide flexible connections at inlet and
outlet of air handling unit.

3.2 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.

3.3 SCHEDULES:

A. Air Handling Units Schedule: Listed below is a schedule of the units
with the physical and operating characteristics of each:

Unit Unit Unit

Fan AHU‑ AHU‑ AHU‑

Capacity (cu ft/min

S.P. (inch w.g.)

Motor hp

Electrical (voltage, phase)

Unit Unit Unit

Heating Coil AHU‑ AHU‑ AHU‑

Fin Series

Type

Height inches

Width inches

Rows

Capacity Btu/hr

Air Entering degrees F

Air Leaving degrees F

Air S.P. Drop inch w.g.

Water, gpm

Water Entering degrees F

Water Leaving degrees F

Water Pressure Drop ft

Steam Capacity lb/hr

Steam Pressure psi

Unit Unit Unit

Cooling Coil AHU‑ AHU‑ AHU‑

Fin Series

Type

Height inches

Width inches

Rows

Capacity Btu/hr

Air Entering

degrees F DB

degrees F WB

Air Leaving

degrees F DB

degrees F WB

Water, gal/min

Water Entering degrees F

Water Leaving degrees F

Water Pressure Drop ft

Saturated Suction degrees F

3.4 TRAINING OF GOVERNMENT EMPLOYEES:

A. Requirements: See Section 01700 - Contract Closeout.

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

4.1 METHOD OF MEASUREMENT:

A. ab 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