15840 Add 2.DOC

Interior Renovations at U.S. Courthouse

GSA Number: GS-03P-98-CDC-0019

Pittsburgh, Pennsylvania

Copyright 2009 by The American Institute of Architects (AIA)

Exclusively published and distributed by Architectural Computer Services, Inc. (ARCOM) for the AIA

SECTION 15840

AIR TERMINAL UNITS

Revise this Section by deleting and inserting text to meet Project-specific requirements.

This Section uses the term "Architect." Change this term to match that used to identify the design professional as defined in the General and Supplementary Conditions.

Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed.

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

Retain or delete this article in all Sections of Project Manual.

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.

B. Related Sections include the following: Refer to specification 15910 Commissioning for additional requirements.

1.2 SUMMARY

A. Section Includes:

1. Shutoff, single-duct air terminal units.

1.3 PERFORMANCE REQUIREMENTS

Retain seismic options and design criteria in paragraph below that are approved by authorities having jurisdiction.

1.4 ACTION SUBMITTALS

A. Product Data: For each type of the following products, including rated capacities, furnished specialties, sound-power ratings, and accessories.

1. Air terminal units.

2. Liners and adhesives.

3. Sealants and gaskets.

B. Shop Drawings: For air terminal units. Include plans, elevations, sections, details, and attachments to other work.

1. Detail equipment assemblies and indicate dimensions, weights, loads, required clearances, method of field assembly, components, and location and size of each field connection.

Retain first subparagraph below if equipment includes wiring.

2. Wiring Diagrams: For power, signal, and control wiring.

Paragraph below is defined in Division 1 Section "Submittal Procedures" as a "Delegated-Design Submittal." Retain with "Performance Requirements" Article if design responsibilities have been delegated to Contractor.

1.5 INFORMATIONAL SUBMITTALS

Retain first paragraph below if Drawings do not include detailed plans or if Project involves unusual coordination requirements.

A. Coordination Drawings: Reflected ceiling plans, drawn to scale, on which the following items are shown and coordinated with each other, using input from Installers of the items involved:

1. Ceiling suspension assembly members.

2. Size and location of initial access modules for acoustic tile.

3. Ceiling-mounted items including lighting fixtures, diffusers, grilles, speakers, sprinklers, access panels, and special moldings.

Retain paragraph below if Contractor is responsible for field quality-control testing and inspecting.

B. Field quality-control reports.

1.6 CLOSEOUT SUBMITTALS

A. Operation and Maintenance Data: For air terminal units to include in emergency, operation, and maintenance manuals. In addition to items specified in Division 1 Section "Operation and Maintenance Data," include the following:

1. Instructions for resetting minimum and maximum air volumes.

2. Instructions for adjusting software set points.

1.7 QUALITY ASSURANCE

A. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.

Retain "ASHRAE Compliance" Paragraph below to require compliance with requirements in ASHRAE 62.1, which includes requirements for controls, surfaces in contact with the airstream, particulate filtration, finned-tube coil selection and cleaning, and equipment access. Also retain for LEED Prerequisite IEQ 1, which requires compliance with ASHRAE 62.1. Verify, with manufacturers, availability of units with components and features that comply with these requirements.

B. ASHRAE Compliance: Applicable requirements in ASHRAE 62.1, Section 5 - "Systems and Equipment" and Section 7 - "Construction and System Start-Up."

PART 2 - PRODUCTS

2.1 SHUTOFF, SINGLE-DUCT AIR TERMINAL UNITS

See Editing Instruction No. 1 in the Evaluations for cautions about naming manufacturers. Retain one of first two paragraphs and list of manufacturers below. See Division 1 Section "Product Requirements."

A. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

Retain option in first paragraph below if manufacturer's name and model number are indicated in schedules or plans on Drawings; delete option and insert manufacturer's name and model number if not included on Drawings.

1. Nailor Industries Inc.

2. Price Industries.

3. Titus.

B. Configuration: Volume-damper assembly inside unit casing with control components inside a protective metal shroud.

C. Casing: 0.034-inch (0.85-mm) steel, single wall.

Retain one of two "Casing Lining" subparagraphs below. Retain first subparagraph for standard linings; retain second for non-fiber liners.

1. Casing Lining: Adhesive attached, 1/2-inch- (13-mm-) thick, coated, fibrous-glass duct liner complying with ASTM C 1071, and having a maximum flame-spread index of 25 and a maximum smoke-developed index of 50, for both insulation and adhesive, when tested according to ASTM E 84.

Retain one of first two subparagraphs below. Retain second subparagraph for double-wall casings.

2. Air Inlet: Round stub connection or S-slip and drive connections for duct attachment.

3. Air Outlet: S-slip and drive connections, size matching inlet size.

4. Access: Removable panels for access to parts requiring service, adjustment, or maintenance; with airtight gasket.

Retain subparagraph below to require compliance with ASHRAE 62.1. Also retain for LEED Prerequisite IEQ 1, which requires compliances with ASHRAE 62.1.

5. Airstream Surfaces: Surfaces in contact with the airstream shall comply with requirements in ASHRAE 62.1.

Retain first paragraph below for units with system-air-powered volume regulators.

D. Regulator Assembly: System-air-powered bellows section incorporating polypropylene bellows for volume regulation and thermostatic control. Bellows shall operate at temperatures from 0 to 140 deg F (minus 18 to plus 60 deg C), shall be impervious to moisture and fungus, shall be suitable for 10-inch wg (2500-Pa) static pressure, and shall be factory tested for leaks.

E. Volume Damper: Galvanized steel with peripheral gasket and self-lubricating bearings.

Leakage rates in first subparagraph below vary among manufacturers and with pressure rating.

1. Maximum Damper Leakage: ARI 880 rated, 2percent of nominal airflow at 3-inch wg (750-Pa) inlet static pressure.

2. Damper Position: Normally closed.

F. Electric-Resistance Heating Coils: Nickel-chromium heating wire, free of expansion noise and hum, mounted in ceramic inserts in a galvanized-steel housing; with primary automatic, and secondary manual, reset thermal cutouts. Terminate elements in stainless-steel, machine-staked terminals secured with stainless-steel hardware.

1. Access door interlocked disconnect switch.

2. Downstream air temperature sensor with local connection to override discharge-air temperature to not exceed a maximum temperature set point (adjustable.)

Retain applicable subparagraphs below.

3. Nickel chrome 80/20 heating elements.

4. Airflow switch for proof of airflow.

5. Fan interlock contacts.

6. Fuses in terminal box for overcurrent protection (for coils more than 48 A).

7. Mercury contactors.

8. Pneumatic-electric switches and relays.

9. Magnetic contactor for each step of control (for three-phase coils).

Retain one of first five paragraphs below or delete all five if controls are specified in Division 15 Section "HVAC Instrumentation and Controls."

Retain first paragraph below if control components are specified with the control system; retain second if control components are packaged with the equipment.

G. Direct Digital Controls: Single-package unitary controller and actuator specified in Division 15 Section "HVAC Instrumentation and Controls."

1. Damper Actuator: 24 V, powered closed, spring return open powered open.

2. Terminal Unit Controller: Pressure-independent, variable-air-volume controller with electronic airflow transducer with multipoint velocity sensor at air inlet, factory calibrated to minimum and maximum air volumes, and having the following features:

Retain applicable subparagraphs below.

a. Occupied and unoccupied operating mode.

b. Remote reset of airflow or temperature set points.

c. Adjusting and monitoring with portable terminal.

d. Communication with temperature-control system specified in Division 15 Section "HVAC Instrumentation and Controls."

3. Room Sensor: Wall mounted with temperature set-point adjustment and access for connection of portable operator terminal.

Retain paragraph below for units with system-powered controls and if control sequences are not specified in Division 15 Section "Sequence of Operation." Revise sequence descriptions to suit Project.

H. Control Sequence:

1. Suitable for operation with duct pressures between 0.25- and 3.0-inch wg (60- and 750-Pa) inlet static pressure.

2. System-powered, wall-mounted thermostat.

2.2 HANGERS AND SUPPORTS

Indicate the extent of corrosive environment on Drawings.

A. Hanger Rods for Noncorrosive Environments: Cadmium-plated steel rods and nuts.

B. Hanger Rods for Corrosive Environments: Electrogalvanized, all-thread rods or galvanized rods with threads painted with zinc-chromate primer after installation.

C. Steel Cable End Connections: Cadmium-plated steel assemblies with brackets, swivel, and bolts designed for duct hanger service; with an automatic-locking and clamping device.

D. Air Terminal Unit Attachments: Sheet metal screws, blind rivets, or self-tapping metal screws; compatible with duct materials.

E. Trapeze and Riser Supports: Steel shapes and plates for units with steel casings; aluminum for units with aluminum casings.

2.3 SOURCE QUALITY CONTROL

Retain paragraph below for factory-assembled units. Factory tests are an added cost option and may not be available from some manufacturers. Verify requirement with Owner.

A. Factory Tests: Test assembled air terminal units according to ARI 880.

1. Label each air terminal unit with plan number, nominal airflow, maximum and minimum factory-set airflows, [coil type,] and ARI certification seal.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install air terminal units according to NFPA 90A, "Standard for the Installation of Air Conditioning and Ventilating Systems."

B. Install air terminal units level and plumb. Maintain sufficient clearance for normal service and maintenance.

Delete paragraph below if thermostats are specified in Division 15 Section "HVAC Instrumentation and Controls."

C. Install wall-mounted thermostats.

3.2 HANGER AND SUPPORT INSTALLATION

A. Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible," Chapter 5, "Hangers and Supports."

Verify attachment selection and spacing in first two paragraphs below with structural engineer.

B. Building Attachments: Concrete inserts, powder-actuated fasteners, or structural-steel fasteners appropriate for construction materials to which hangers are being attached.

1. Where practical, install concrete inserts before placing concrete.

2. Install powder-actuated concrete fasteners after concrete is placed and completely cured.

3. Use powder-actuated concrete fasteners for standard-weight aggregate concretes and for slabs more than 4 inches (100 mm) thick.

4. Do not use powder-actuated concrete fasteners for lightweight-aggregate concretes and for slabs less than 4 inches (100 mm) thick.

Retain subparagraph below for Projects that require seismic restraints.

5. Do not use powder-actuated concrete fasteners for seismic restraints.

C. Hangers Exposed to View: Threaded rod and angle or channel supports.

D. Install upper attachments to structures. Select and size upper attachments with pull-out, tension, and shear capacities appropriate for supported loads and building materials where used.

3.3 CONNECTIONS

A. Connect ducts to air terminal units according to Division 15 Section Nonmetal Ducts.

Coordinate duct installations and specialty arrangements with Drawings.

B. Make connections to air terminal units with flexible connectors complying with requirements in Division 15 Section "Duct Accessories."

3.4 IDENTIFICATION

A. Label each air terminal unit with plan number, nominal airflow, and maximum and minimum factory-set airflows. Comply with requirements in Division 15 Section "Identification for HVAC Piping and Equipment" for equipment labels and warning signs and labels.

3.5 FIELD QUALITY CONTROL

Retain one of first three paragraphs below to identify who shall perform tests and inspections. If retaining second option in first paragraph, or if retaining second or third paragraph, retain "Field quality-control reports" Paragraph in "Informational Submittals" Article.

A. Testing Agency: Engage a qualified testing agency to perform tests and inspections.

Retain first paragraph below to require a factory-authorized service representative to perform inspections, tests, and adjustments.

B. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect, test, and adjust components, assemblies, and equipment installations, including connections.

Retain first paragraph below to require Contractor to perform tests and inspections.

C. Perform tests and inspections.

Retain subparagraph below to require a factory-authorized service representative to assist Contractor with inspections, tests, and adjustments.

1. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect components, assemblies, and equipment installations, including connections, and to assist in testing.

Retain first paragraph below to describe tests and inspections to be performed.

D. Tests and Inspections:

1. After installing air terminal units and after electrical circuitry has been energized, test for compliance with requirements.

Retain first subparagraph below for air terminal units with hot-water coils.

2. Leak Test: After installation, fill water coils and test for leaks. Repair leaks and retest until no leaks exist.

3. Operational Test: After electrical circuitry has been energized, start units to confirm proper motor rotation and unit operation.

4. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment.

See Division 1 Section "Quality Requirements" for retesting and reinspecting requirements and Division 1 Section "Execution Requirements" for requirements for correcting the Work.

E. Air terminal unit will be considered defective if it does not pass tests and inspections.

F. Prepare test and inspection reports.

END OF SECTION 15840

October 26, 2010

Addendum 2 15840 - 1 Air Terminal Units