SECTION 15855

AIR HANDLING UNITS

PART 1 GENERAL

SECTION INCLUDES

Packaged air handling units.

Heating coils.

Mixing boxes.

Combination filter/mixing boxes.

Filter sections.

Face and bypass dampers.

Multi-zone dampers.

Sprayed coil dehumidifiers.

Cooling coils.

Humidifiers.

RELATED SECTIONS

Section 15671 - Air Cooled Condensing Units.

REFERENCES

AFBMA 9 - Load Ratings and Fatigue Life for Ball Bearings.

AFBMA 11 - Load Ratings and Fatigue Life for Roller Bearings.

AMCA 99 - Standards Handbook.

AMCA 210 - Laboratory Methods of Testing Fans for Rating Purposes.

AMCA 300 - Test Code for Sound Rating Air Moving Devices.

AMCA 301 - Method of Publishing Sound Ratings for Air Moving Devices.

AMCA 500 - Test Methods for Louver, Dampers, and Shutters.

ARI 410 - Forced-Circulation Air-Cooling and Air-Heating Coils.

ARI 430 - Central-Station Air-Handling Units.

ARI 435 - Application of Central-Station Air-Handling Units.

ARI 610 - Central System Humidifiers.

NEMA MG1 - Motors and Generators.

NFPA 70 - National Electrical Code.

SMACNA - HVAC Duct Construction Standards - Metal and Flexible.

UL 900 - Test Performance of Air Filter Units.

SUBMITTALS

Submit under provisions of Section 01300.

Shop Drawings: Indicate assembly, unit dimensions, weight loading, required clearances, construction details, field connection details, and electrical characteristics and connection requirements.

Product Data:

Provide literature which indicates dimensions, weights, capacities, ratings, fan performance, gages and finishes of materials, and electrical characteristics and connection requirements.

Provide data of filter media, filter performance data, filter assembly, and filter frames.

Provide fan curves with specified operating point clearly plotted.

Submit sound power level data for both fan outlet and casing radiation at rated capacity.

Submit electrical requirements for power supply wiring including wiring diagrams for interlock and control wiring, clearly indicating factory-installed and field-installed wiring.

Samples:	Submit one of each type of replacement filter media with frame.

Manufacturer's Installation Instructions.

OPERATION AND MAINTENANCE DATA

Submit under provisions of Section 01700.

Maintenance Data: Include instructions for lubrication, filter replacement, motor and drive replacement, spare parts lists, and wiring diagrams.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing the Products specified in this section with minimum ten years documented experience, who issues complete catalog data on total product.

DELIVERY, STORAGE, AND HANDLING

Deliver, store, protect and handle products to site under provisions of Section 01600.

Accept products on site in factory-fabricated protective containers, with factory-installed shipping skids and lifting lugs. Inspect for damage.

Store in clean dry place and protect from weather and construction traffic. Handle carefully to avoid damage to components, enclosures, and finish.

ENVIRONMENTAL REQUIREMENTS

Do not operate units for any purpose, temporary or permanent, until ductwork is clean, filters are in place, bearings lubricated, and fan has been test run under observation.

EXTRA MATERIALS

Furnish under provisions of Section 01700.

Provide one set for each unit of fan belts and filters

PART 2 PRODUCTS

MANUFACTURERS

See drawings.

GENERAL DESCRIPTION

Configuration: Fabricate with fan and evaporator coil section plus accessories, including:

Heating, (3 stages of 10 kw each) electric heat.

Mixing box section.

Combination filter/mixing box section.

Filter section.

Evaporator section.

Performance Base: Sea level conditions.

Fabrication: Conform to AMCA 99 and ARI 430.

CASING

Construction: Fabricate on channel base and drain pan of welded steel coated externally with manufacturers standard paint finish [with perforated inside casing].

Assemble sections with gaskets and bolts.

Outside Casing:

a.	Steel:	16 gage .

Inside Casing:

Galvanized Steel: 24 gage .

Floor Plate:

Galvanized Steel: 10 gage .

Insulation: 1-1/2 inch thick, neoprene coated, glass fiber insulation, "K" value at 75 degrees F maximum 0.26 Btu/inch/sq ft/degrees F/hr ("ksi" value at 42 degrees C maximum 0.037 W/m/Degree K), applied to internal surfaces with adhesive and weld pins. Coat exposed edges of insulation with adhesive.

Finish: Baked enamel.

Inspection Doors: 10 x 10 inch galvanized steel

ELECTRICAL CHARACTERISTICS AND COMPONENTS

Electrical Characteristics:

208 volts, three phase, 60 Hz.

Motor: Open drip proof TEFC .

Wiring Terminations:	Provide terminal lugs to match branch circuit conductor quantities, sizes, and materials indicated. Enclose terminal lugs in terminal box sized to NFPA 70.

2.5	BLOWER

A.	Type: Centrifugal type fan.

B.	Performance Ratings: Conform to AMCA 210 and bear the AMCA Certified Rating Seal.

C.	Sound Ratings: AMCA 301; Tested to AMCA 300 and bear AMCA Certified Sound Rating Seal.

D.	Bearings: Self-aligning, grease lubricated, ball or roller bearings with lubrication fittings extended to exterior of casing with copper tube and grease fitting rigidly attached to casing.

E.	Mounting: Locate fan and motor internally on welded steel base coated with corrosion resistant paint. Factory mount motor on slide rails. Provide access to motor, drive, and bearings through removable casing panels or hinged access doors.

2.6	COILS

A.	Refrigerant Coils:

Headers:	Seamless copper tubes with silver brazed joints.

Liquid Distributors:	Brass or copper venturi type distributor with seamless copper distributor tubes.

Configuration:	Down feed with bottom suction.

B.	Electric Coils:

1.Assembly: UL 1096 listed and labelled, with terminal control box and [hinged] cover, splice box, coil, casing, and controls.

2.	Coil: Exposed helical coil.

3.	Casing: Die formed channel frame of galvanized steel.

Controls: Automatic reset thermal cut-out, built-in magnetic contactors. Control circuit transformer and fuse, manual reset thermal cut-out, air flow proving device, load fuses.

C.	Refrigerant Cooling Coil Capacity:

See drawings.

Electric Coil Capacity:

See drawings.

2.7	FILTERS

A.	Filter Box: Section with filter guides, access doors from both sides, for loading.

B.	Filter Media: UL 900 listed, Class I or Class II, approved by local authorities.

C.	Flat High Capacity]: Arrangement with 2 inch disposable panel filters.

PART 3 EXECUTION

INSTALLATION

CAUTION: Unit must be partially disassembled to enter	existing room.

Install in accordance with manufacturer's instructions.

Install in conformance with ARI 435.

Assemble high pressure units by bolting sections together. [Isolate fan section with flexible duct connections.]

Install assembled unit on vibration isolators. Refer to Section 15242.

AIR HANDLING UNIT SCHEDULE

See drawings.

END OF SECTION