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READ AND REMOVE THIS PAGE BEFORE PLACING
THE SPECIFICATION SECTION IN THE CONTRACT

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DIVISION 15:  MECHANICAL

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, boldface, and italics, within the paragraphs; and this page.  (Open Reveal Codes [alt F3] to do this accurately.)

	D.	To Edit “(Footer B)”: (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

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

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

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:  [   ] cu ft/min supply air at [   ] inch w.g. external static pressure with [   ] hp motor.

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

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

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

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

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