Variable Volume Units ME- Building Group

SECTION 233610 – VARIABLE VOLUME UNITS

PART 1 - GENERAL

1.1  SUMMARY

  1. This Section includes single-duct air terminal units.

1.2  SUBMITTALS

  1. Product Data: For each type of product indicated, include rated capacities, furnished specialties, sound-power ratings, and accessories.
  2. Shop Drawings: Detail equipment assemblies and indicate dimensions, required clearances, method of field assembly, components, and location and size of each field connection.
  3. Include a schedule showing unique model designation, room location, model number, size, and accessories furnished.
  4. Wiring Diagrams: Power, signal, and control wiring.
  5. Coordination Drawings: Reflected ceiling plans, drawn to scale, on which the following items are shown and coordinated with each other, based on input from installers of the items involved:
  6. Ceiling suspension assembly members.
  7. Method of attaching hangers to building structure.
  8. Size and location of initial access modules for acoustical tile.
  9. Ceiling-mounted items including lighting fixtures, diffusers, grilles, speakers, sprinklers, access panels, and special moldings.
  10. Operation and Maintenance Data: For air terminal units to include in emergency, operation, and maintenance manuals. Include the following:
  11. Instructions for resetting minimum and maximum air volumes.
  12. Instructions for adjusting software set points.

1.3  QUALITY ASSURANCE

  1. Product Options: Drawings indicate size, profiles, and dimensional requirements of air terminal units and are based on the specific system indicated. Refer to Division1 Section "Product Requirements."
  2. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA70, Article100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use.
  3. NFPA Compliance: Install air terminal units according to NFPA90A, "Standard for the Installation of Air Conditioning and Ventilating Systems."

1.4  COORDINATION

  1. Coordinate layout and installation of air terminal units and suspension system with other construction that penetrates ceilings or is supported by them, including light fixtures, HVAC equipment, fire-suppression system, and partition assemblies.

PART 2 - PRODUCTS

2.1  SINGLE-DUCT AIR TERMINAL UNITS

  1. Basis-of-Design Product: The design is based on Titus, AESV. Subject to compliance with requirements, provide either the named product or a comparable product by one of the following:
  2. Carnes.
  3. Krueger.
  4. METALAIRE, Inc.; Metal Industries Inc.
  5. Price Industries.
  6. Titus.
  7. Configuration: Diverting-damper assembly inside unit casing with control components located inside a protective metal shroud.
  8. Casing: 0.034-inch (22 gage) steel.
  9. Casing Lining: 1/2-inch- thick, coated, fibrous-glass duct liner complying with ASTMC1071; secured with adhesive.
  10. Air Inlet: Round stub connection for duct attachment.
  11. Air Outlet: S-slip and drive connections.
  12. Access: Removable panels for access to diverter and other parts requiring service, adjustment, or maintenance; with airtight gasket.
  13. Diverter Assembly: Galvanized-steel gate, with polyethylene linear bearings.
  14. Electric Controls: Damper actuator and thermostat.
  15. Damper Actuator: 24V, powered closed, powered open.
  16. Thermostat: Wall-mounting electric type with temperature display in Fahrenheit and Celsius, and space temperature set point.
  17. Changeover Thermostat: Duct-mounting, electric type reverses action of controls when duct temperature rises 70 degF.
  18. Electronic Controls: Bidirectional damper operator and microprocessor-based thermostat with integral airflow transducer and room sensor.
  19. Basis-of-Design Product: The design is based on Titus, TA1 controls. Subject to compliance with requirements, provide either the named product or a comparable product by the VAV unit manufacturer.
  20. Damper Actuator: 24V, powered closed, powered open.
  21. Thermostat: Wall-mounting electronic type with the following features:
  22. Proportional, plus integral control of room temperature.
  23. Time-proportional reheat-coil control.
  24. Temperature set-point display in Fahrenheit and Celsius.
  25. Auxiliary switch shall energize heating control circuit.
  26. Changeover thermistor shall reverse action.

2.2  SOURCE QUALITY CONTROL

  1. Identification: Label each air terminal unit with plan number, nominal airflow, maximum and minimum factory-set airflows, coil type, and ARI certification seal.
  2. Verification of Performance: Rate air terminal units according to ARI880.

PART 3 - EXECUTION

3.1  INSTALLATION

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

3.2  CONNECTIONS

  1. Union or flange.
  2. Connect ducts to air terminal units according to Division23 Section "Metal Ducts."
  3. Connect wiring according to Division26 Section "Low-Voltage Electrical Power Conductors and Cables."
  4. Tighten electrical connectors and terminals according to manufacturer's published torque-tightening values. If manufacturer's torque values are not indicated, use those specified in UL486A and UL486B.

3.3  FIELD QUALITY CONTROL

  1. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect,test, and adjust field-assembled components and equipment installation, including connections. Report results in writing.
  2. Perform the following field tests and inspections and prepare test reports:
  3. After installing air terminal units and after electrical circuitry has been energized, test for compliance with requirements.
  4. Leak Test: After installation, fill water coils and test for leaks. Repair leaks and retest until no leaks exist.
  5. Operational Test: After electrical circuitry has been energized, start units to confirm proper motor rotation and unit operation.
  6. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment.
  7. Remove and replace malfunctioning units and retest as specified above.

3.4  STARTUP SERVICE

  1. Engage a factory-authorized service representative to perform startup service.
  2. Complete installation and startup checks according to manufacturer's written instructions and do the following:
  3. Verify that inlet duct connections are as recommended by air terminal unit manufacturer to achieve proper performance.
  4. Verify that controls and control enclosure are accessible.
  5. Verify that control connections are complete.
  6. Verify that nameplate and identification tag are visible.
  7. Verify that controls respond to inputs as specified.

3.5  DEMONSTRATION

  1. Engage a factory-authorized service representative to train Owner's maintenance personnel to adjust, operate, and maintain air terminal units.

END OF SECTION

Page 4 of 4

Revision Date: 01/21/14 Project & Bid Package

File name: 233610 VARIABLE VOLUME UNITS