Auburn University
Auburn University
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Auburn University
 


D30 HVAC

  1. General


    1. Indoor Design Conditions:  Indoor – Summer 75degrees F/50% RH – Winter 70 degrees F.  Some areas/spaces may have different requirements that are project specific.


    2. Standard System:  The University prefers VAV systems with hot water reheat.


    3. Mechanical rooms shall have exterior doors to grade level, at least one light on emergency power, an audio-visual monitoring system, fire alarm, and pull station at the exit.


    4. Coil pulls shall be shown to scale on drawings.


    5. Drawings shall indicate path of travel for removal and replacement of largest piece of equipment located in mechanical rooms.


    6. Motor Starters, Control Panels, & Variable Frequency Drives shall be mounted on wall at accessible height standing from floor. Equipment mounted or Uni-strut type frame mounting is not acceptable.


    7. HVAC Equipment Plus (AHU’s, Pumps, etc.) shall be located on a housekeeping pad.


    8. Provide shut-off valves for all services into laboratory spaces to allow for single lab to be isolated.


    9. Locate main piping runs above corridors when possible, and provide isolation valves to shut down each floor or sections of a floor.


    10. Locate isolation valves above coil pull line to allow coil to be removed without disruption to hydronic services to other units.


    11. The designer shall minimize quantity of dielectric unions.  Unions shall be located in accessible locations for ease of maintenance.  Engineer shall provide a drawing indicating location of all dielectric unions.  Provide ball valves on each side of union to allow for repair of union.


    12. Indicate design static pressure for fan set-up during commissioning.


    13. There will be a full HVAC commissioning at a minimum.  Additional commissioning requirements shall be chosen during the Design Development phase in conjunction with the Auburn Project Manager.  The minimum requirements for Commissioning are outlined in Appendix D.


    14. An Energy Estimate Form is included in Appendix E. It shall be completed and submitted for review with the design development phase submittal.


    15. The following shall be included under “Equipment and Systems Start-up”: “Following start-up procedures, adjust equipment for proper operation within manufacturer’s published guidelines and tolerances. Demonstrate proper operation of equipment and systems to designated University representatives and the Commissioning Agent.


    16. Provide air balance table with room air changes per hour, design temperatures, and humidity percentages, total & outside air flows (cfm) and cfm/ft2 on contract documents.


    17. Provide access panels for all devices (Dampers, actuators, etc.)     


  2. Basic HVAC Materials and Methods


    1. Central Utilities


      1. Chilled Water:


        • Supply Temperature: 40 degrees Fahrenheit.


        • Return Temperature:  no less than 55 degrees Fahrenheit.


        • Provide 2-way modulating type chilled water control valve if building is connected to campus central loop.


        • A schematic diagram of the chilled water interface between a building and the main campus loop is included in Appendix F.


      2. Hot Water:


        • Supply Temperature:  225 degrees Fahrenheit.
        • Return Temperature:  no more than 165 degrees Fahrenheit.


        • A schematic diagram of the hot water interface between a building and the main campus loop is included in Appendix G.


      3. Steam:


        • Supply Pressure:  100 psig.


    2. Variable Frequency Drives


      1. Provided with controls and must have data link communication with central controls system (Johnson Controls Metasys System).


      2. No bypass required.


      3. NEMA 12 enclosure.


      4. With integrated disconnect switch.


      5. Danfoss VLT6000 or approved equal


    3. Motors


      1. Maximum Motor RPM:  1750


      2. All motors 5 hp or larger shall be premium efficiency, inverter duty.


      3. Thrust blocks shall be formed and poured in place.


      4. Floor sleeves shall be cast-in-place schedule 40 steel pipe, 2” above floor, flush with bottom of slab.  Sheet metal sleeves are not acceptable.


      5. Pressure gauges to be provided with gauge valve.


      6. Thermometers to be provided with thermometer well.


      7. P-T Plugs (Pete’s Plugs) shall be provided adjacent to all control sensors for testing and verification.


    4. Controls


      1. A sole source purchasing agreement with Johnson Controls exists for the communication backbone. The existing system is a Johnson Controls Metasys system. All control systems must be capable of full communication with this system.


      2. The following shall be included under “BAS Manufacturer’s Field Services”:

      3. “Contractors shall be responsible for the initial controls testing prior to commissioning by the University. All aspects of the system shall be correct in functionality before commencement of commissioning. Commissioning will be performed by the University, Contractors, BAS Contractor, Construction Administration Engineer, and Commissioning Agent”.

      4. Allow sufficient time for start-up and commissioning prior to placing systems in permanent operation.


      5. Must be a way to locally adjust controls in all auditoriums.


      6. Temperature sensors shall be nickel construction.


      7. Control relays shall be installed in control panels, starters, or variable speed drive.


      8. Control thermostat/sensor boxes in walls shall be sealed/caulked to prevent airflow through the device. 


    5. Mechanical Sound, Vibration, and Seismic Control


      1. Sound Control shall be designed in accordance with ASHRAE Applications Handbook, latest edition.


      2. Vibration Control shall be designed in accordance with ASHRAE Applications Handbook, latest edition.


      3. Seismic Control shall be designed in accordance with the International Building Code 2003, or as determined by the Alabama Building Commission


    6. Mechanical Identification


      1. Piping Identification shall comply with ANSI A13.1.


      2. Piping labels shall be in accordance with the chart located in Appendix H of this document


      3. Equipment Identification shall be engraved plastic tags glued or mechanically fastened to equipment.  Letters shall be a minimum of 1” high.


      4. For equipment located above ceilings provide engraved plastic tag glued to ceiling grid adjacent to ceiling tile that shall be removed for access to equipment.  Tags shall be ¾” x 3.5”.  Color and legend as noted below:


        • Chilled Water Valves: Green w/ white letters. “CHILLED WATER VALVE”.


        • Hot Water Valves:  Yellow w/ black letters.  “HOT WATER VALVE”.


        • Steam Valves:  Red w/ white letters.  “STEAM VALVE”.


        • VAV Boxes or Air Valve:  Black w/ white letters.  “VAV BOX”, “VAV-scheduled number”, “AV-scheduled number”.  Nomenclature shall be consistent throughout facility.


        • Electric Reheat Coils:  Gray w/ white letters.  “ELECTRIC REHEAT”.
        • Fire Dampers:   White w/ red letters.  “FIRE DAMPER”.


        • Smoke Damper:  White w/ red letters.  “SMOKE DAMPER”.


    7. Mechanical Insulation


      1. Duct Installation


        • No internal duct liner allowed.


        • Provide externally wrapped fiberglass insulation or factory fabricated double wall duct with perforated metal liner.


        • All duct work with the possibility of condensation shall be insulated. 


      2. Pipling Installation


        • End joints of pipe insulation shall be sealed to pipe.


        • A pre-installation conference shall be specified to ensure that proper techniques are followed.


        • Insulation shall be as listed below for service piping:


          • Chilled Water Piping:  Cellular glass.


          • Underground Pre-insulated Pipe Conduit:  Polyurethane or cellular glass.


          • Steam and Condensate Piping:  Fiberglass


          • Hot Water Piping:  Fiberglass


    8. Heating and Cooling Piping and Components


      1. Cooling Coil Condensate Drains:  Copper type ‘L’ hard drawn, with soldered joints.


      2. Heating and Cooling Pumps:  Base mounted centrifugal.  Provide two 100% capacity pumps for redundancy.  Horizontal split case pumps are acceptable for larger capacity requirements.


      3. Chilled Water Piping:


        1. Above Grade


          • 5” and larger:  Black steel, schedule 40


          • 4” and smaller:  Copper type ‘L’


        2. Below Grade


          • 5” and larger:  Ductile Iron


          • 4” and smaller:  Copper type ‘L’


        3. Hot Water Piping


          • Above Grade:  


            • 5” and larger: Black steel, schedule 40


            • 4” and smaller: Copper type ‘L’


          • Below Grade:


            • 5” and larger: Black steel, standard weight


            • 4” and smaller: Copper type ‘L’


        4. Condenser Water Piping:


          • 5” and larger: Black steel, schedule 40


          • 4” and smaller: Copper type ’L’


        5. Refrigerant Piping:  Copper tubing, type ‘ACR’


        6. Steam Piping:  Black steel, schedule 40


        7. Steam Condensate Piping:  Black steel, schedule 80


        8. Steam Condensate Pumps:  Duplex receiver type


        9. Make-up Water Piping:  Copper type ‘L’


        10. Chemical Treatment System Piping:  Black steel, schedule 40


        11. Water Treatment Equipment:  Coordinate requirements with Auburn


        12. Primary side valves shall be offset butterfly type with metal seats.


        13. Mechanically formed (pulled) T’s are acceptable for ½ “ and 3/4 “ piping connections to 2: or larger pipe.



  3. Heating, Ventilation, and Air Conditioning Equipment


    1. Air Handling Units


      1. Units shall be double wall construction.


      2. Drain pans shall be constructed of stainless steel.


      3. Intermediate drain pans shall be installed on multiple coil sections.


      4. Do NOT locate any air handler above a ceiling without prior approval.


      5. Do NOT use custom air handlers. Manufacturer’s standard products shall be used.


      6. Use of fan coil units is discouraged and shall be used in limited scope. Do NOT locate any fan coil unit above a ceiling without prior approval.


    2. Use of fan coil units is discouraged and shall be used in limited scope. Do NOT locate any fan coil unit above a ceiling without prior approval.


    3. For energy recovery equipment, locate all maintenance parts (belts, motors, bearings, etc.) outside of contaminated air stream.



  4. Air Distribution


    1. Ducts


      1. Fibrous Glass Ducts: Fibrous glass duct or (ductboard) are not acceptable.


      2. Flexible Ducts: Flexible duct runouts to diffusers shall be limited to 5 feet.


      3. Metal Ducts: Design and construction shall comply with SMACNA standards.


      4. Specialty ductwork materials (i.e. stainless steel, aluminum, etc.) or construction shall be clearly noted and hatched on the plans.


      5. Underground ductwork is not acceptable.


    2. For any fan that exhausts hazardous materials or fumes, locate all maintenance items out of the air stream. Fans shall have an upblast discharge if possible.


    3. Provide access door for maintenance of all air terminal units.


    4. Diffusers, Registers, and Grilles shall be of corrosion resistant construction of aluminum or stainless steel.


    5. Duct insulation support pins shall be welded to ductwork. Glue-on/stick-on pins are not acceptable.


    6. No underground ductwork is allowed.



  5. Boilers and Pressure Vessels


    1. Boilers and pressure vessels shall be designed, constructed, installed, operated, maintained, and inspected in accordance with Alabama Boiler and Pressure Vessel Safety Act.


    2. Permits for boilers and pressure vessels, new or relocated, shall be included in project costs.


    3. Provide emergency shutdown button switch for each boiler. Switch shall be maintained and tested, mushroom type at mechanical room entrance.


    4. Provide startup and commissioning of all new boilers by the manufacturer or by a manufacturer certified technician.
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