This master should be used by designers working on Port of Portland construction projects and by designers working for PDX tenants (“Tenants”). Usage notes highlight a few specific editing choices, however the entire section should be evaluated and edited to fit specific project needs.

SECTION 233600 - AIR TERMINAL UNITS

PART 1 - GENERAL

1.1DESCRIPTION

  1. This section describes air terminal units.

1.2RELATED WORK SPECIFIED ELSEWHERE

  1. Section 230500, Common Work Results for HVAC
  2. Section 230529, Hangers and Supports for HVAC Piping and Equipment
  3. Section 230545, Seismic Restraints for HVAC Piping and Equipment
  4. Section 230553, Identification for HVAC Piping and Equipment
  5. Section 230593, Testing, Adjusting, and Balancing
  6. Section 230719, HVAC Insulation
  7. Section 230900, Instrumentation and Controls for HVAC Systems
  8. Section 232000, HVAC Piping
  9. Section 233113, Low Pressure Ductwork
  10. Section 233114, Medium Pressure Ductwork

1.3REFERENCES

  1. ADC: Air Diffusion Council
  2. ARI: Air-Conditioning and Refrigeration Institute
  3. ARI 880: Performance Rating of Air Terminals
  4. ASHRAE: American Society of Heating, Refrigerating and Air-Conditioning Engineers
  5. ASHRAE 130: Methods of Testing Air Terminal Units
  6. NFPA: National Fire Protection Association
  7. NFPA 90A: Standard for the Installation of Air-Conditioning and Ventilating Systems
  8. UL: Underwriters Laboratories
  9. UL 181: Standard for Factory-Made Air Ducts and Air Connectors

1.4SUBMITTALS

  1. For equipment and components specified herein, submit product/material data; shop drawings; operation and maintenance data; as-constructed data; installation, startup, and testing manuals; operation and maintenance manuals; and as-constructed drawings.
  2. Product Data:
  3. Include construction details and performance characteristics for each type and size of terminal unit.
  4. Include data showing compliance with discharge and radiated sound power level specified.
  5. Include computer calculations for heating coils supplied with unit.

Use only if Commissioning Section 019100 is included in the project manual.

  1. For equipment and components specified below, submit commissioning plans and schedules; checkout, startup, operational, functional and final acceptance test plans, procedures, checklists, and reports; systems manuals; and operation and maintenance training plans.

1.5QUALITY ASSURANCE

  1. Select units for sound levels, maximum pressure drops, and maximum inlet velocity as specified.

PART 2 - PRODUCTS

2.1SINGLE DUCT CONSTANT OR VARIABLE VOLUME TERMINAL UNITS

  1. Acceptable Manufacturers: Titus, Environmental Technologies, Trane, Krueger, or pre-bid approved equal.
  2. Description: Single duct, medium velocity, pressure independent, variable volume or constant volume.
  3. Construct of minimum 22-gauge galvanized steel. Construction shall be leakproof with all joints sealed and all access doors gasketed. Leakage rate shall be less than 15 cfm at 3.0inch differential S.P. Provide access door for cleaning of coil as an integral part of the unit. Interior lined with coated dual density or matt faced insulation meeting NFPA 90A requirements with lining in accordance with UL l8l.
  4. Volume Regulator Assembly:
  5. Controller and actuator shall be in accordance with Section 230900, Instrumentation and Controls for HVAC Systems, and factory mounted in NEMA panel.
  6. Provide averaging type velocity sensor utilizing multiple sensing points.
  7. Factory set but field adjustable with CFM scale external to unit.
  8. Air valves shall be all metal construction, non-corrosive, with self-lubricating bearings and moving parts that are replaceable in the field.
  9. Air static pressure drop across terminal unit shall not exceed 0.35-inch W.G. without coil and 0.55-inch W.G. with water coil. Maximum inlet duct velocities shall not exceed 2200 fpm.
  10. Sound ratings shall be tested as power level 10-12 watts in accordance with ARI 880 standard and ASHRAE 130 at 1.5-inch W.G. inlet static pressure. Unit discharge airborne and casing radiated sound shall not exceed following rated sound power levels:

MAXIMUM AIRBORNE SOUND POWER (db)

Octave Band & Center Frequency(Hz)
1 / 2 / 3 / 4 / 5 / 6 / 7
CFM / 63 / 125 / 250 / 500 / 1K / 2K / 4K
0 - 300 / -- / 63 / 64 / 60 / 60 / 60 / 52
301 - 400 / 68 / 65 / 65 / 63 / 60 / 60 / 52
401 - 800 / 71 / 68 / 67 / 67 / 60 / 60 / 52
801 - 1200 / 73 / 72 / 68 / 67 / 60 / 60 / 52
1201 - 2000 / 73 / 75 / 69 / 67 / 60 / 60 / 54
2001 and above* / -- / 80 / 78 / 76 / 67 / 67 / 60
*Units shall have 5'-0" of 2-inch-thick lined duct or 3'-0" IAC MS sound trap provided with unit at units’ discharge to meet acoustic design goals.

Complete octave band and center frequency for “2001 and above,” or delete if not used.

MAXIMUM RADIATED SOUND POWER (db)

Octave Band & Center Frequency(Hz)
1 / 2 / 3 / 4 / 5 / 6 / 7
CFM / 63 / 125 / 250 / 500 / 1K / 2K / 4K
0 - 2000 / 71 / 68 / 61 / 61 / 55 / 55 / 50
2001 and above
*Units shall have loaded vinyl wrap over 2-inch-thick insulation.
  1. Provide normally open air valves as specified.
  2. Provide water heating coils as specified.
  3. Provide electric heating coils as specified.

PART 3 - EXECUTION

3.1INSTALLATION, TERMINAL UNITS

  1. Support terminal units from structure using threaded rod and brackets provided. Make medium velocity duct connection to the inlet with minimum length of straight duct upstream of unit as recommended by the manufacturer or as specified, whichever is greater.
  2. Install minimum 5 feet of lined sheet metal ductwork on outlet of terminal units, or as specified on drawings, whichever is greater. Install terminal unit to allow complete access to controls.
  3. Provide a minimum of 5 feet of ductwork prior to first spin-in fitting or outlet branch duct takeoff.
  4. Where units have loaded vinyl wrap over insulation, install wrap to allow access into control panel.

Choose from Commissioning and Testing articles. Use Commissioning if Section 019100 is included; otherwise use Testing.

3.2COMMISSIONING

  1. Commission equipment and components specified herein.

3.3TESTING

  1. Check out, start up, and test the equipment and components specified herein.

END OF SECTION 233600

11/17/2018 / AIR TERMINAL UNITS
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