Facility Operations

Heating, Ventilating, and Air Conditioning (HVAC)

GENERAL PROVISIONS

  • Design shall comply with the requirements of most recent version of the following code and/or standards:
    1. Ohio Building Code
    2. Ohio Mechanical Code
    3. ASHRAE 15
    4. ASHRAE 55
    5. ASHRAE 62.1
    6. ASHRAE 90.1
    7. LEED - NC 
  • All designs shall use the following criteria for calculations and equipment selections:
    1. Heating Design Temperature:           0oFdb
    2. Cooling Design Temperature:           ASHRAE 0.4% Cooling with Mean Coincident Wet Bulb
    3. Air cooled Refrigeration Condensing Temperature:     100oFdb
    4. Heating Setpoint:                                 68oFdb unless otherwise specified
    5. Cooling Setpoint:                                 75oFdb unless otherwise specified
    6. Maximum Relative Humidity:            55% RH unless otherwise specified
  • All designs shall focus on building energy efficiency.  The following minimum performance of the total building shall be achieved and documented using an ASHRAE 90.1 Appendix G energy model:
    1. New Construction:              25% better than the 90.1 Appendix G baseline requirement
    2. Renovation where 70% of floor area of the facility is affected:                 20% better than the 90.1 Appendix G baseline requirement

 

 

230100 – OPERATION AND MAINTENANCE OF HVAC SYSTEMS                                                                                  

  • Special attention shall be given during design and construction to accessibility of systems required for maintenance and code required verification of operation.  All necessary service clearances to major equipment (chillers, boilers, AH units, fans, pumps, and VAV terminal units) shall be shown on the drawings and maintained clear and accessible.  Access doors in both walls/ceilings and in ducts shall be provided to permit access.
  • Equipment requiring maintenance or code required verification shall not be located in such locations as to make them not readily accessible.  Examples of prohibited installations are:  above classroom tiering, in ceilings or at levels of atriums that require large lift access, above swimming pools.  If installation in these locations is required, fixed access platforms shall be incorporated into the design.  OSHA required fall protection system tie-off points and related railings shall be accounted for during the design.
  • Provide three (3) copies of O&M manuals for all HVAC systems and equipment as well as one (1) copy on USB flash media.
  • Provide HVAC system training at the conclusion of the project.  Sessions shall not exceed four (4) hours in duration, shall be focused on one specific topic, and shall be digitally recorded and turned over the University on DVD-ROM media.
  • Adequate storage space for attic stock shall be incorporated into the design.  Attic stock shall be provided for all consumables on each project including, but not limited to:
    1. Filters – two full sets of all filters
    2. Belts – one full set of belts
  • Air handling equipment shall be located within the building in mechanical rooms or penthouses.  Exterior roof mounted equipment is not acceptable, except in the case of exhaust fans.
    • If roof mounted equipment is approved via variance, it shall be screened with materials consistent with the building envelope construction.
  • All major equipment shall be provided with a 5 year part and labor warranty, non-prorated as part of the project construction.  This equipment shall include, at minimum:
    • Air Handling Units
    • Boilers
    • Pumps
    • Chillers
    • Cooling Towers
    • Chemical Treatment System Equipment
    • Heat Pump Units
  • A central equipment mounted on grade or on the roof shall be screened with materials consistent with the building envelope construction.
  • All Variable Frequency drive units shall be provided with a factory installed three – contactor bypass to permit removal and replacement of the VFD unit while maintaining operation at constant speed.
    • The DDC control system shall monitor the “Bypass” position of each VFD on a fan system and drive Air Terminal units to a proper position for continued operation and temperature control while the system operates in VFDE Bypass mode.

 

230519 – METERS AND GAGES FOR HVAC PIPING                                                                                                            

  • Each building utility shall be provided with electronic metering connected to the building DDC system.  Utilities to be metered include:
    • Domestic Cold & Hot Water
    • Natural Gas
    • Electricity – via integration of Powerlogic metering into the DDC
    • Steam
    • Chilled Water
    • Heating Hot Water
  • Utility meters shall be the following type:
    • Domestic Cold and Hot Water – Badger Industrial Disc with electronic instantaneous and totalized flow to DDC or similar
    • Natural Gas – Dattus FM2 with electronic instantaneous and totalized flow to DDC or similar
    • Electricity – via integration of Powerlogic metering into the DDC of Demand and Usage
    • Steam – Spirax Sarco RIM Series with electronic instantaneous and totalized flow to DDC or similar
    • Chilled Water – ONICON F-120 Turbine Meter with electronic instantaneous and totalized flow to DDC or similar and related temperature sensing for BTU calculation
    • Heating Hot Water - ONICON F-120 Turbine Meter with electronic instantaneous and totalized flow to DDC or similar and related temperature sensing for BTU calculation
    • Make up water to closed loop hydronic systems shall be equipped with a Badger Industrial Disc with electronic instantaneous and totalized flow to DDC or similar  type meter.
  • Gages and thermometers shall be provided on the inlet and outlet of each piece of HVAC equipment including but not limited to:
    • AH unit coils
    • Chillers
    • Boilers
    • Pumps

Additionally, analog gages / thermometers shall be provided at all DDC sensors locations in central utilities.

  • Gages shall be 4” liquid filled, bourdon tube type.
  • Thermometers shall be 9” color reading spirit filled column type.

 

230523 – GENERAL DUTY VALVES FOR HVAC PIPING                                                                                                      

  • All valves for steam service shall be rated for a minimum of 500oF and 1.5 times the system relief pressure.
  • Valves for hydronic service shall be as follows:
    1. 3” and smaller:                     2 piece, ball type
    2. 3.5” and larger:                    butterfly type, lug body, rated for shutoff service
  • Shut-off valves shall be provided at each floor to facilitate isolation without shutdown of the entire facility.
  • Shut-off valves shall be provided at each piece of equipment to permit isolation during service.  One valve at each piece of equipment may be a combination device such as automatic flow controller with shut-off valve or combination manual balance and shut-off valve.
  • Water flow balance devices may be manual balance valves with locking operators or automatic flow controllers, at the Associate Engineer’s discretion.  If manual balance valves are utilized, return systems shall be design as reverse return in their entirety.  If automatic flow controllers are utilized, direct return systems may be utilized.

 

230548 – Vibration and Seismic Controls for HVAC                                                                                                         

  • All fans 1 HP and larger shall be installed on combination spring / rubber isolation systems.
  • All base mounted pumps shall be installed on combination spring/rubber isolation systems.
  • All inline pumps 5 Hp and larger shall be installed on combination spring/rubber isolation systems.
  • Inertia bases shall be provided on rotating equipment not installed on grade.

 

230553 – Identification  for HVAC Piping and Equipment                                                                                             

  • Mark location of fan coil units, VAV terminal units, and other equipment concealed within a ceiling plenum or cavity with “buttons” to approximate the devices location.  The button should be printed with the devices equipment ID.
  • All major equipment shall be tagged with a specific identifier.  This shall include, at minimum:
    • AH units
    • Chillers
    • Boilers
    • Pumps
    • Fans
    • VAV terminal units
    • Fan coils
    • Unit Heaters
    • Fire and Smoke Dampers

 

  • Labeling shall be placed on all duct and piping systems at 50 ft intervals maximum. Directional arrows shall be located with each system label.
  • Duct labeling shall be representative of the duct service:
    • Supply
    • Return
    • Relief
    • Exhaust
    • Laboratory Exhaust
    • Outside Air
  • Pipe band colors and letters for HVAC Systems shall be as follows:
Pipe Band Colors for HVAC Systems Table

STEAM - BLACK

BANDS

ABBREVIATION
High pressure steam Black-Red  STM-HI
Medium pressure steam Black-Yellow       STM-MED
Low pressure steam Black-Orange    STM-LOW
High pressure return Black-Purple STM-HPR
Pumped condensate return Black-Green    P.C.R.
Condensate drain Black-White C.D.

HEATING -  YELLOW

BANDS

ABBREVIATION
Hot water heating supply Yellow-Red  H.W.H.S.
Hot water return Yellow-Orange H.W.H.R.

AIR CONDITIONING-GREEN

BANDS

ABBREVIATION
Refrigerant piping Green-Red REF.
Chilled water supply Green-White     CH.W.S.
Chilled water return Green-Yellow CH.W.R.
Condensate water supply Green-Orange C.W.S.
Condenser water return Green-Purple    C.W.R.

 

230593 – Testing, Adjusting, and Balancing for HVAC                                                                                                    

  • All air systems and hydronic systems shall be balanced for appropriate operation and optimal emergency performance.
  • Balance contractors shall be certified by the Associated Air Balance Commission (AABC).

 

230713 – DUCT INSULATION                                                                                                                                                     

  • All ducts shall be insulated as required by ASHRAE 90.1.
  • Duct insulation in exposed areas including mechanical rooms shall be rigid board type insulation with FSK jacket.  Duct insulation in concealed areas shall be flexible blanket type insulation with FSK jacket.
  • Fiberglass duct liner shall not be utilized.  Fiber free liner may be considered for use with approval of Campus Engineering only.

 

 

230719 – HVAC PIPING INSULATION                                                                                                                                      

  • All piping shall be insulated as required by ASHRAE 90.1.
  • Insulation on heating hot water, steam, and steam condensate systems shall be factory molded tubular fiberglass insulation with factory applied ASJ.
  • Insulation on cold service piping (<60oF) shall be cellular glass type insulation with factory applied ASJ.

 

 

230923 – DIRECT-DIGITAL CONTROL SYSTEMS FOR HVAC                                                                                            

  • The existing University DDC front end is Siemens Apogee 600.  All control system components shall be fully integrated into the existing Siemens front end via proprietary Siemens protocol or native BACNet protocol.  Coordinate closely with the University the integration requirements for any project control system work.
  • New Buildings and Existing Buildings without Siemens DDC:  all controls shall be native BACNet type.  All manufacturers must be capable of integration of all I/O functions via BACNet gateway to the existing Siemens campus front end system including but not limited to:
    1. All schedules
    2. All setpoints
    3. All enable / disable functions
    4. All analog points (I/O)
    5. All binary points (I/O)
    6. All building energy metering points
    7. Global points
      • Campus outdoor lighting control on/off
      • Outside air temperature
      • Outside air humidity
  • Existing buildings with Siemens DDC:  all controls shall be Siemens Apogee 600 BACNet.
  • All actuators (modulating and two-position) shall be electronic.  Pneumatic actuation cannot be utilized.
  • DDC thermostats shall be ABS plastic cover with local occupied/unoccupied override and setpoint adjustment slide or dial.
  • All control systems shall be provided with trends (15 min sample time, 7 day storage for each) setup prior to turnover for the following minimum points:
    • AH Units
      • Supply Fan Speed
      • Return or Relief Fan Speed
      • Discharge Air Temperature
      • Cooling Valve Position
      • Preheat and/or Heating Valve Position
      • OA/RA Damper Position
    • Chiller Plants
      • Chiller # Discharge Water Temp
      • Chiller # Entering Water Temp
      • Chiller Load %
      • Common Chilled Water Supply Temp
      • Common Chilled Water Return Temp
      • Common system differential pressure
      • Energy Meter output
      • Correlating outdoor air temperature
    • Heating Plants
      • Boiler # Discharge Water Temp
      • Boiler # Entering Water Temp
      • Boiler # Firing Rate
      • Common Heating Hot Water Supply Temp
      • Common Heating Hot Water Return Temp
      • Common system differential pressure
      • Energy Meter output
      • Correlating outdoor air temperature
  • Thermal control zones (VAV, Fan Coil, etc.) shall be tied to local occupancy control sensors for lighting to initiate occupied/unoccupied mode of that thermal zone unless approved otherwise by campus engineering.
  • Control valves
    • AH Unit valves shall be Belimo Energy Valve or similar by Flow Energy.
    • Thermal zone valves for VAV units, Fan Coil units, etc. shall be characterized ball or globe type valves.
    • All valve actuators shall be true modulating type.  Floating point actuators shall not be utilized.
    • All valves shall be rated for 150% close – off pressure of the maximum system service operating pressure (i.e. relief valve setting).

 

232113.23 – Aboveground Hydronic Piping                                                                                                                        

  • Piping systems for HVAC service shall be one or more of the following system types:
    • Schedule 40 or 80 Black Steel with Screwed, Flanged, or Welded joints
    • Type L Copper Tubing with Wrought Copper fittings and soldered or brazed joints

 

232123 – Hydronic Pumps                                                                                                                                                          

  • Pumps may be base mounted or inline based on design requirements.
  • Inline Pumps 5 HP and larger shall be flexible coupling type.  Under 5 HP may be direct couple.
  • Pumps 5 HP and larger SHALL NOT be balanced by a manual balance valve.  A VFD shall be provided and, if not a variable speed pump, shall be manually set for balance purposes and programmed for constant speed operation at the determined appropriate balance frequency.

 

232200 – Steam  and Condensate Piping and Pumps                                                                                                      

  • Steam condensate pumping units shall be electric driven, duplex type with integral pump alternator.
  • Pump operation, trouble, and condensate temperature shall be monitored by the building DDC system.
  • Steam piping shall be Schedule 40 Black Steel with Screwed, Flanged, or Welded joints.
  • Steam condensate piping shall be Schedule 80 Black Steel with Screwed, Flanged, or Welded joints or Schedule 10 Stainless Steel Type 304L with Flanged or Welded joints or Schedule 40 Stainless Steel Type 304L SS with Screwed joints..

 

232300 – Refrigerant Piping                                                                                                                                                       

  • Refrigeration piping shall be hard drawn Type ACR copper tubing with wrought copper brazed joints.
  • Any refrigeration piping installed within walls, chases, or in ceiling spaces above occupied spaces shall be supported within vibration isolation hangers to limits the transmission of vibration into the structure.

 

232513 – Water Treatment for Closed-Loop Hydronic Systems                                                                                 

  • All make up water to closed loop hydronic systems shall be softened and filtered for solids PRIOR to the automatic water make up system due to the excessive hardness in local water on campus.
  • Each closed loop system shall be provided with an automatic feed water system with meter to maintain minimum system pressure.
  • Each closed loop system shall be provided with a 5 Gallon chemical bypass – filter shot feeder.

 

232516 – Water Treatment for Open Hydronic Systems                                                                                               

  • All make up water to open loop hydronic systems shall be softened and filtered for solids PRIOR to the automatic water make up system due to the excessive hardness in local water on campus.
  • University preference is for Non-Chemical Water treatments systems for open loop hydronic systems such as Clearwater Systems Dolphin or similar. 
    • All Non-chemical systems shall be selected for proper control of solids, hardness, and biological contaminants. 
    • All Non-chemical systems shall be provided with a side stream centrifugal separator system for the removal of particulates and precipitates.
    • All Non-chemical systems shall be provided with a basin sweep system on the cooling tower to ensure entrainment of solids and precipitates.
  • With Campus Engineering approval only, consideration will be given to the use of automatic solid injection chemical systems.

 

232519 – Water Treatment for Steam System Feedwater                                                                                            

  • All make up water to steam systems shall be softened and filtered for solids PRIOR to the steam chemical treatment system due to the excessive hardness in local water on campus.
  • Each steam boiler shall be equipped with surface blowdown line, automatically controlled based on water conductivity or boiler load.
  • Each boiler shall be equipped with By-pass Feeders/Chemical Pot Feeders for chemical injection into the boiler.
  • Each steam system (group of multiple boilers) shall be equipped with an automatic chemical monitoring and feed system with the following minimum components:
    • o Metering Pumps
    • o Chemical Pump Timers
    • o Make-up Water and meter
    • o Bleed Solenoid Valves
  • All chemicals used in the steam system shall be FDA Approved for direct steam injection into HVAC airstreams
  • All Chemical Feed Piping shall be stainless steel

 

233100 – HVAC Ducts and Casings                                                                                                                                          

  • All HVAC ducts shall be metallic construction (galvanized steel, aluminum, or stainless steel) and appropriate for the service.  Fiberglass duct board or liner shall not be utilized.
  • Flexible ductwork shall be spiral reinforced rated for positive and negative pressure and may be utilized in the following locations only:
    • Direct connection to the inlet of a VAV terminal unit.  Length shall not exceed 5 feet.  Any changes in direction shall match the dimensional relationship of a corresponding hard duct elbow.
    • Runouts to air devices (supply, return, and dry exhaust) with a maximum length of 4 feet.  Any changes in direction shall match the dimensional relationship of a corresponding hard duct elbow.
  • Louver plenums shall be 2” double wall air plenum casing with internal insulation.  All bottoms of louver plenums shall be welded construction, water-tight and shall be equipped with a piped drain connection or pitched to the louver sill for drainage.

 

233600 –Air Terminal Units – VAV and CAV                                                                                                                        

  • Air terminal units shall be single duct type with integral airflow sensing ring.
  • Air terminal units shall be double wall construction only.
  • Hot water reheat coils shall be copper tube, aluminum fin.
  • Air terminal units shall be selected to minimize sound and air pressure drop while maintaining appropriate control characteristics.

 

233813 – Commercial-Kitchen Hoods                                                                                                                                   

  • All Type 1 commercial kitchen hoods shall be equipped with a control system which varies the airflow through the hood based on cooking load operation under the hood similar to Melink Intelli-hood.

 

233816 – Chemical Fume Hoods                                                                                                                                              

  • The university is a participant in the labs 21 program and is committed to energy efficient laboratory ventilation. All fume hoods shall be variable air volume type, low airflow, high efficiency design.  60 FPM face velocities are anticipated with these style hoods.
  • All fume hoods shall be field tested prior to turnover for compliance with ANSI/ASHRAE Standard 110.

 

234100 – Particulate Air Filtration                                                                                                                                          

  • All Air Handling units shall be equipped with the following minimum filtration:
    • Prefilters:              MERV 6, Cartridge Type, 2” Throw Away Media
    • Final Filters:          MERV 13, Cartridge Type, 12” Throw Away Media
  • Provide a minimum of two full sets of replacement filters at project close-out, in addition to the set currently installed in the unit.
  • All return/exhaust air inlets shall be protected with disposable MERV 8 filter media throughout the construction phase of all projects.

 

235200A – Heating Boilers – Hot Water                                                                                                                               

  • All heating boilers shall be design for condensing operation unless specifically accepted as Non-condensing by Campus Engineering.
  • New buildings and major renovations shall be selected for heating water temperatures that permit boiler condensing operation throughout the entire year to maintain maximum boiler efficiency.
  • All boilers shall be equipped for modulating burners with a minimum of 5:1 Turndown ratio.
  • Electronic flame safeguard operating, sequencing and safety controls
  • ASME stamped with corresponding pressure relief valve.  Operating and safety pressures shall be coordinated with Campus Engineering.
  • Heating hot water systems (multiple boiler installations) shall be equipped with a boiler optimization control system which stages the boilers and controls their firing rates for maximum possible efficiency.  This control system shall be integrated into the building DDC system via a BACNet gateway.
  • University preference is for direct vent, separated combustion systems.

 

235200B – Heating Boilers – Steam                                                                                                                                        

  • All steam boilers shall be packaged forced draft scotch marine type, wet back design with minimum 3-passes, 358 sf maximum heating surface unless approved by Campus Engineering.
  • Natural gas fired powered burner, modulating, with minimum 5:1 turn down, and UL/FM gas train.
  • Electronic flame safeguard operating, sequencing and safety controls
  • ASME stamped with corresponding pressure relief valve.  Operating and safety pressures shall be coordinated with Campus Engineering.
  • 10 year refractory warranty.
  • Surge load baffles.
  • Connections for automatic surface blow-down (and skimming tube), and manual bottom blow-down (with slow and quick opening valves furnished with the boiler)
  • Low water cutoff, pump controller, water column with try cocks, and gauge glass with ball checks and cocks, separate or in combination.
  • Probe type auxiliary low water cut‑off.
  • High limit safety pressure control.
  • Operating pressure control.
  • Low‑fire hold/ minimum temperature control for warm‑up and stand‑by mode in the sequencing of boilers.
  • Modulating feedwater control and motorized valve, maximum 10 psi pressure drop.
  • Factory installed sample cooler equal to Penn, complete with needle valve and bimetal thermometer on sample outlet, ball valve on cold water inlet, drain connection, and connection to boiler with shutoff globe valve.
  • Factory wired control panel with main power disconnect for single point power connection, controls transformer, magnetic starters or contactors and overload protection for each motor, solid state flame safeguard controller with full sequencing and operating, checking and safety controls, damper motor positioning switch and manual‑automatic selector switch, status indication lights (for power on, call for heat, pilot operation, burner operation and shutdown due to low water, pilot failure and flame failure), alarm bell and silencing switch, and other trim and accessory items, as appropriate. 
  • Steam systems (multiple boiler installations) shall be equipped with a boiler optimization control system which stages the boilers and controls their firing rates to maintain design system pressure.  This control system shall be integrated into the building DDC system via a BACnet gateway.

 

236400A –Water Chillers - Air Cooled                                                                                                                                   

 

  • Chillers shall be selected for best possible kW/Ton.  Ambient outdoor air temperature for capacity selection shall be ASHRAE 0.4% Cooling plus 5oF.
  • Units shall have solid state starters or VFD for compressor motors.
  • Unit shall have unloading capability to at least 10% of rated capacity.
  • Provide liquid solenoid valve on systems using coil pump down
  • Isolation valves shall be provided on all independent circuits.
  • Install liquid charging port and service valve on large systems (> 50 Tons).
  • Install sight glass- moisture indicator in convenient and accessible location
  • All motors shall have sensors in windings for thermal protection
  • The following safeties:
    • High and low pressure safety cutout
    •  External overload protection
    • Low oil pressure
    •  Timer to limit restart
    • Safeties shall be manually reset electrically lockout unit and a trouble light for activated device
  • Gauges shall be provided on the high side, low side, and oil pressure
  • Forced feed lubrication with filter, cooler, and visual inspection port in the oil reservoir shall be provided
  • Capacity control:
    • Digitally operated adjustable capacity control in the machine control cabinet with a minimum adjustable range of 10 to 100 percent
    • Device shall be suitable to be reset by Remote Power Management System
  • Provide crankcase heaters on a separate electrical circuit
  • Provide purge units to eliminate non condensable gases if required for refrigerant used
  • Provide a pump out unit and receiver large enough to hold the full refrigerant charge into the receiver, if required for refrigerant provided
  • Each chiller shall be equipped with a BACNet interface to DDC to fully integrate the chiller controls.  At minimum, the following information shall be ported:
    • Enable/Disable
    • CW Setpoint
    • Operating Capacity
    • CW Entering Temperature
    • CW Leaving Temperature
    • Refrigeration Circuit Temperatures and Pressures
  • Units shall be equipped with electric barrel heaters for freeze protection.

 

236400B –Water Chillers - Water Cooled                                                                                                                             

  • Chillers shall be selected for best possible kW/Ton. 
  • Units shall have solid state starters or VFD for compressor motors.
  • Unit shall have unloading capability to at least 10% of rated capacity.
  • Provide liquid solenoid valve on systems using coil pump down
  • Isolation valves shall be provided on all independent circuits.
  • Install liquid charging port and service valve on large systems (> 50 Tons).
  • Install sight glass- moisture indicator in convenient and accessible location
  • All motors shall have sensors in windings for thermal protection
  • The following safeties:
    • High and low pressure safety cutout
    •  External overload protection
    • Low oil pressure
    •  Timer to limit restart
    • Safeties shall be manually reset electrically lockout unit and a trouble light for activated device
  • Gauges shall be provided on the high side, low side, and oil pressure
  • Forced feed lubrication with filter, cooler, and visual inspection port in the oil reservoir shall be provided
  • Capacity control:
    • Digitally operated adjustable capacity control in the machine control cabinet with a minimum adjustable range of 10 to 100 percent
    • Device shall be suitable to be reset by Remote Power Management System
  • Provide crankcase heaters on a separate electrical circuit
  • Provide purge units to eliminate non condensable gases if required for refrigerant used
  • Provide a pump out unit and receiver large enough to hold the full refrigerant charge into the receiver, if required for refrigerant provided
  • Each chiller shall be equipped with a BACNet interface to DDC to fully integrate the chiller controls.  At minimum, the following information shall be ported:
    • Enable/Disable
    • CW Setpoint
    • Operating Capacity
    • CW Entering Temperature
    • CW Leaving Temperature
    • Refrigeration Circuit Temperatures and Pressures

 

237300 –Air-Handing Units                                                                                                        

 

  • Fans shall be rated to AMCA standards.
    • Selection shall be made from standard catalogued data.
    • Selection shall be made in a unit classification at a pressure at least 20 percent less than the maximum pressure listed for that particular manufacturer’s classification (an excess pressure of 20 percent must be available without exceeding the construction classification of the unit furnished)
    • Drives shall be “V” belt type selected at 150 percent of the specified operating power.
    • Units serving variable volume systems shall have stable fan operation (without objectionable noise or vibration) across the entire fan system curve, down to the minimum CFM listed on the drawings, and without exceeding the static pressure rating of the duct work system. Fan motors shall operate within name plate values
    • Fans for low pressure construction shall be forward curve type. Fans for medium pressure construction to be air foil backwardly inclined non-overloading type or forward curved type. Fan selection shall be in a stable range of the curve and within 10 percent of the maximum efficiency of that particular fan.  Fans shall be statically and dynamically balanced.
    • Fan bearings shall be pillow type (not split) ball bearing, self-aligning type. For fans above 2 horsepower bearings shall be greaseable type with 200,000 hours predicted bearing life. Supply extended grease lines where bearings are inaccessible due to unit construction or location. Motor may be either internally or externally mounted. Provide slide rails with 2 adjusting nuts. Base shall be connected to the integral framework of the casing
    • Moving parts shall be isolated from the casing to eliminate vibration and noise transmission. All drives, whether inside or casing or exterior to casing, shall have protection guards
  • Casing shall be double wall heavy gauge steel reinforced with angles and assembled bolts and screws, fully thermally broken construction. Component parts shall be flange joints. Double wall casing components shall be lined with injected polyurethane foam insulation provide a minimum of R13 performance on the assembly. All insulation shall meet NFPA flame and smoke requirements.
  • Access doors shall be provided into each separate compartment, including convenient access to any internal motor and drive. In addition, furnish 20” x 20” gasketed hinged and lock seal type inspection doors on all sections with window and service light.
  • An insulated drip pan shall be incorporated under the cooling coil section.
  • Heating and cooling coil sections, minimum 14” deep in direction of air flow, and removable and with gasketed seals to prevent air bypass.
  • Filters shall be side access, slide rail mounting, cartridge type.
  • Furnish where shown, mixing boxes for return and fresh air, complete with provisions for multi-leaf dampers. Dampers shall be extruded aluminum blade and frame with integral edge seals and blade seals, low leakage type.  Dampers on outside air and relief air shall be insulated thermally broken construction.

 

238123 – COMPUTER-ROOM AIR-CONDITIONERS                                                                                                            

  • Each Communication Closet, MDF Room, IDF Room, Elevator Machine Room, or similar shall be provided with a dedicated air cooled, DX split system to provide proper conditioning.
  • Exterior condensing units shall be equipped for cooling operation during low ambient temperatures as low as 0oF.
  • Humidification of these spaces is not required.
  • Each system shall be monitored by the building DDC system for the following criteria:
    1. Space Temperature
    2. System Trouble

 

238413 – Humidifiers                                                                                                                                                                   

  • All humidification shall be via direct injection of steam from a central boiler system.  The use of local steam generation equipment is not acceptable.
  • Steam dispersion tubes shall be selected for rapid absorption of steam into the air stream.
  • University preference is for humidifier dispersion locations to be within AH units in a mechanical room.  In areas which this is not possible, the duct section 24” upstream and 24” past the point of 100% absorption shall be stainless steel.

 

 

 

Facility Operations

Location: 
060 Allyn Hall
Hours: 
Open 24 hours a day, seven days a week
Phone: 
937-775-4444
Email: 

facilities@wright.edu

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