MPS Master
SECTION 23 74 13
PACKAGED CUSTOM OUTDOOR CENTRAL-STATION AIR HANDLING UNITS
PART 1 - GENERAL
1.01 SUMMARY
A.Section Includes: Include labor, materials, equipment, and appurtenances necessary to furnish and install packaged outdoor centralstation heating, ventilating, and air conditioning units and trim indicated on Drawings and specified.
1.Extent of air handling unit work is indicated on Drawings and schedules, and by requirements of this Section.
2.Types of packaged air handling units specified in this Section include the following:
a.Rooftop Air Handling Units with Supply Return Fans for Heating and Ventilating
3.Refer to other Division23 sections for steam piping, ductwork, and vibration isolation required in conjunction with rooftop air handling units; not work of this Section.
4.Refer to Division 26 sections for the following work not included in this Section:
a.Power Supply Wiring; from power source to power connection on unit
5.Work of this Section includes the following:
a.Interlock wiring between electrically operated equipment units and between equipment and field installed control devices, including that specified as furnished or factory wired by manufacturer.
6.Air handlers shall be enclosed in penthouse.
1.02 QUALITY ASSURANCE
A.Regulatory Requirements:
1.StateBuilding Code
2.Local Codes and Ordinances
3.Local Authority having jurisdiction
B.Manufacturer Qualifications: Firms regularly engaged in manufacture of packaged air handling units with characteristics, sizes, and capacities required, whose products have been in satisfactory use in similar service for not less than 5years.
C.Codes and Standards:
1.AMCA Compliance: Test and rate air handling units in accordance with AMCA Standards.
2.ARI Compliance: Test and rate air handling units in accordance with ARI 430, Standard for Central-Station Air Handling Units; display certification symbol on units of certified models.
23 74 13 - 1
Packaged CUSTOM Outdoor Central-Station Air Handling Units
MPS Master 2014
Rev. 1
SECTION 23 74 13
3.NFPA Compliance: Provide air handling unit internal insulation having flame spread rating not over 25 and smoke developed rating no higher than 50, and in accordance with NFPA 90A, Standard for the Installation of Air Conditioning and Ventilating Systems.
4.UL and NEMA Compliance: Provide electrical components required as part of air handling units, which have been listed and labeled by UL and meet NEMA Standards. Provide integral service corridor for electrical apparatus attached to unit.
5.NEC Compliance: Meet requirements of National Electrical Code (NFPA 70) as applicable to installation and electrical connections of ancillary electrical components of air handling units.
1.03 SUBMITTALS
A.General: Provide submittals in accordance with Section 013300.
B.Product Data: Submit manufacturer’s technical Product Data for air handling units showing dimensions, weights, capacities, ratings, fan performance with operating point clearly indicated, motor electrical characteristics, gauges, finishes of materials, and installation instructions.
C.Wiring Diagrams: Submit manufacturer’s electrical requirements for power supply wiring to air handling units. Submit manufacturer’s laddertype wiring diagrams for interlock and control wiring. Clearly differentiate between portions of wiring that are factory installed and portions to be field installed.
D.Maintenance Data: Submit maintenance instructions, including instructions for lubrication, filter replacement, motor and drive replacement, and spare parts lists. Include this data, Product Data, Shop Drawings, and wiring diagrams in maintenance manuals, in accordance with requirements of Division1.
1.04 DELIVERY, STORAGE, AND HANDLING
A.General: In accordance with manufacturer’s rigging and installation instructions for unloading air handling units and moving them to a final location.
B.Delivery: Deliver air handling units with factory installed shipping skids and lifting lugs; pack components in factory fabricated protective containers.
C.Handling: Handle air handling units carefully to avoid damage to components, enclosures, and finish. Do not install damaged components; replace and return damaged components to air handling unit manufacturer.
D.Storage: Store air handling units in clean dry place and protect from weather and construction traffic.
PART 2 - PRODUCTS
2.01 MANUFACTURERS
23 74 13 - 1
Packaged CUSTOM Outdoor Central-Station Air Handling Units
MPS Master 2014
Rev. 1
SECTION 23 74 13
A.Acceptable Manufacturers for Air Handling Units: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows or Owner approved equal:
1.Trane Custom Performance Climate Changers
2.Haakon
3.Innovent
2.02 AIR HANDLING UNITS
A.General: Provide factory furnished and factory tested air handling units as indicated, of sizes and with features and capacities as scheduled and as specified herein.
1.Each air handling unit shall be factory tested and shipped in sections for field assembly. Units shall be specifically designed for outdoor rooftop application and include a weatherproof cabinet.
a.Units shall be factory assembled and shipped in a single piece.
b.All units shall have decals and tags to indicate caution areas and to aid unit service. Nameplates shall be fixed to each unit. Installation and maintenance bulletin shall be supplied with each unit.
c.Fan and coil performance shall be AMCA and ARI certified.
d.Each accessible section shall be provided with light fixture and conduit for single point connection by Section26.
B.Cabinet, Casing, and Frame:
1.All sections shall be built and fabricated of continuous G90 galvanized steel. All sections shall be thermally and acoustically insulated with consistent wall thickness throughout the unit.
2.The unit base shall be heavy gauge galvanized steel frame using a perimetric high formed channel. Intermediate channels and structural supports shall also be heavy gauge galvanized steel. The base shall be of a continuous construction and shall have removable lifting brackets.
3.The floor shall be galvanized steel. All joints shall be continuously welded and protected with galvicon. The floor shall act as a 1inch deep watertight drain pan. A 4inch thick fiberglass insulation blanket shall be installed within the floor and protected from underneath by a galvanized steel liner.
23 74 13 - 1
Packaged CUSTOM Outdoor Central-Station Air Handling Units
MPS Master 2014
Rev. 1
SECTION 23 74 13
4.Walls and ceiling shall be constructed with doublewall type acoustic panels. They shall have a cross section that includes a 4inch thick, 11/2pound density matt faced insulation. All panels shall be internally screwed together and externally sealed with a heavy bead of polyurethane caulking compound to provide a visible assurance of seal. All units must be suitable for pressure differentials up to 15inch static pressure. The manufacturer shall guarantee a maximum leakage rate of 1percent at specified conditions.
5.Acoustic panel outer skin shall be 16gauge galvanized steel and inner skin shall be 22gauge perforated galvanized liner. Inbetween media shall have long resilient inorganic glass fibers bonded with a thermosetting resin. The media shall have a density of 2.5pounds/ft3 and be compressed by a minimum of 10percent. Mylar film shall completely wrap around the insulation for additional protection. Neoprene coated insulation is not acceptable due to fiberglass erosion into the airstream and its potential for bacterial development. Foil faced insulation alone is not acceptable either due to its poor ability to resist tearing.
6.The acoustic performance of the panels shall be equal to the following:
Octave Band124250500100020004000
Absorption Coefficient.70.99.99.99.99.90
Transmission Loss (STC-44) 28 29 46 49 54 57
7.Exterior surface shall be phosphatized and coated with polyurethane finish of a color selected by the Architect/Engineer. Hinged access doors with flush mounted, single level latching mechanisms shall provide access to each cabinet section from both sides. Access doors shall seal to Vinyl, dual durometer gasketing for a positive seal.
C.Coil Sections: Coil sections shall incorporate single or multiple coils. The stainless steel condensate drain pan shall extend beyond the leaving airside of the cooling coil and extend underneath the coil connections. A threaded drain connection shall extend through the unit base. For stacked coils, an intermediate mastic coated drain pan shall be provided with drop tubes on each end. Water coils shall have threaded connections located on the same end. Coil headers, distributors, and connections shall be completely enclosed in the unit casing. Vent and drain connections shall be provided on all water cooling coils. Coils shall have copper headers and copper tubes, mechanically bonded to ripple-corrugated aluminum fins. Coils shall have a galvanized steel casing. Contractor type coils shall be certified in accordance with Air Conditioning and Refrigeration Institute (ARI) Standard 41072. Coil performance shall be substantiated by computer generated output data.
1.Unit heating coils shall be of the integral face and bypass type steam heating coils arranged with vertical tubes. Dampers shall be complete with operating linkage. Coils shall be tested at 315pound air pressure and rated for 250psig working pressure.
2.Unit coil section shall have sufficient room for future cooling coil.
23 74 13 - 1
Packaged CUSTOM Outdoor Central-Station Air Handling Units
MPS Master 2014
Rev. 1
SECTION 23 74 13
D.Supply Air Fan Section: Supply fans shall be single width, single inlet centrifugal, airfoil curved type. All fans shall be statically and dynamically balanced for quit operation. Airfoil fan wheels shall be Class 11 type and fabricated from steel with fan blades continuously welded to the back plate and end rim, and shall operate in a continuous steel housing. Units shall have solid steel shafts mounted in heavyduty L50 200,000hour greasable ball bearings. Shafts in units to be coated with rust inhibitor. The entire fan assembly shall be completely isolated from the unit bulkhead with neoprene gasketing and mounted on double deflection spring isolators with 2inch static deflection. Fan motors shall be heavy duty, 1,800rpm, open drip-proof type with greasable ball bearings. The motor shall have a variable pitch sheave and be mounted on an adjustable base for proper alignment and belt tension adjustment. Drives shall be selected at 1.5 service factor.
1.Provide grease tube extensions (copper) extended to the exterior of the cabinet.
E.Filter Section: The filter section shall be supplied complete with galvanized steel filter racks as an integral part of the unit. Filters shall be accessible from both sides of the unit. The filter section shall be provided with panel type filters. Panel filters shall be 2inch thick throwaway glass fiber type, 30percent efficient, mounted in a galvanized steel filter frame. The panel filter section shall be designed for face velocities not to exceed 150fpm.
1.To allow MPS to standardize on filter sizes for all air handling units, filter sizes shall be consistent and based on full 24inch by 24inch or half 12inch by 24inch sizes. Other sized filters are not acceptable unless specifically approved by MPS.
F.Return Air/Outdoor Air Section: A return air plenum shall provide 100percent return air capability. A duct collar shall accept return air ductwork for a bottom return air connection. 0to 100percent economizer dampers shall allow for modulating 0to 100percent outdoor air intake. The 0to 100percent economizer dampers shall consist of outside air, return air, and exhaust air dampers. Outside air shall be introduced through horizontal louvered intake hood complete with rain lip and bird screen. The unit floor of the outside air section shall be sloped for water drainage. The outside and return air damper shall be sized to handle 100percent of the supply air volume and be of a low leak design, including gasketing and side seals on all blade edges. Blades shall be of a heavyduty, airfoil design allowing larger blades running the full cabinet height and a minimum of 7inch wide. Leakage shall not exceed 0.05percent at 11/2inch w.c.
G.Return Air Fan: A return air fan shall be used in conjunction with the 0to 100percent economizer damper section. Return air fans shall be single inlet, single width centrifugal airfoil type. All fans shall be statically and dynamically balanced for quiet operation. Airfoil fan wheel shall be Class II type and fabricated from steel with the fan blades continuously welded to the back plate and end rim. Units shall have solid steel fan shaft mounted in heavyduty L50 200,000hour greasable ball bearings. The entire fan assembly shall be completely isolated from the unit bulkhead with neoprene gasketing and mounted on double deflection spring isolators with 2inch static deflections. Fan motors shall be heavyduty, 1,800rpm, open dripproof type with greasable ball bearings. The motor shall have a variable pitch sheave and adjustable base for proper alignment, belt tension, and adjustment. Drives shall be selected at 1.5 service factor.
1.Provide grease tube extensions (copper) extended to the exterior fo the cabinet.
H.Roof Curb:
23 74 13 - 1
Packaged CUSTOM Outdoor Central-Station Air Handling Units
MPS Master 2014
Rev. 1
SECTION 23 74 13
1.The manufacturer shall supply a prefabricated 12gauge, galvanized steel mounting curb, designed and manufactured by the unit manufacturer. Roof curb shall be provided for field assembly on the roof decking prior to unit shipment.
a.The roof curb shall be a full perimeter type with complete perimeter support of the air handling unit. The curb shall be a minimum of 24inch high with liquid tight, continuously welded corner seams, prime coated, 2inch by 4inch wood nailing strip and 3pound density rigid fiberglass insulation. Curb shall be straightcantless type with full metal liner. Gasket shall be provided for field mounting between the unit base and roof curb.
b.Unit shall include an insulated panel under compressor section to prevent condensation forming on bottom. Provide dimensions to allow for easy duct location and connection to roof curb prior to unit placement. Curb design shall meet requirements of National Roofing Contractors Association and shall account for the slope of the roof to ensure the rooftop unit is level.
2.03 ARCHITECTURE/COMMUNICATION
A.General Requirements: The Project shall be comprised of a high speed Ethernet network utilizing BACnet/IP communications between system controllers and workstations. Communications between system controllers and subnetworks of custom application controllers and/or application specific controllers shall utilize BACnet/MSTP (RS485) communications.
1.Each system controller shall perform communications to a network of custom application and application specific controllers using BACnet/MSTP (RS485) as prescribed by the BACnet standard.
a.Each system controller shall function as a BACnet router to each unit controller providing a unique BACnet device ID for all controllers within the system.
2.For the minimum points to be mapped to the BMS by BACnet, refer to the BMS points list. As part of the Shop Drawing submittal for this equipment, indicate confirmation of the minimum points by BACnet and provide a list of additional points that are available.
PART 3 - EXECUTION
3.01 INSPECTION
A.General: Examine areas and conditions under which rooftop units are to be installed. Do not proceed with work until unsatisfactory conditions have been corrected in manner acceptable to installer.
3.02 INSTALLATION OF AIR HANDLING UNITS
23 74 13 - 1
Packaged CUSTOM Outdoor Central-Station Air Handling Units
MPS Master 2014
Rev. 1
SECTION 23 74 13
A.General: Install rooftop units where indicated, in accordance with equipment manufacturer's published installation instructions, and with recognized industry practices, to ensure that units meet the requirements and serve intended purposes.
B.Support: Install and secure roof curb to roof structure, in accordance with National Roofing Contractors Association (NRCA) installation recommendations and Shop Drawings. Install and secure rooftop units on curbs and coordinate roof penetrations and flashing.
C.Access: Provide access space around air handling units for service as indicated, but in no case less than the recommended by manufacturer.
*************************************************************************
Note to Specifier: Design professional to provide catwalk or other means of safe service access to exterior.
**************************************************************************
D.Piping Connections: Refer to Division23 HVAC sections. Provide piping, valves, accessories, gauges, and supports as indicated. Steam and condensate connections at units shall be made with flexible pipe.
E.Electrical Wiring: Install electrical devices furnished by manufacturer, but not specified to be factory mounted. Furnish copy of manufacturer's wiring diagram submittal to electrical installer.
1.Verify that electrical wiring installation is in accordance with manufacturer's submittal and installation requirements of Division26 sections. Do not proceed with equipment startup until wiring installation is acceptable to equipment installer.
F.Dual Connections: Refer to Division23 air distribution sections. Provide ductwork, accessories, and flexible connections as indicated.
G.Lubrication: After systems and equipment have been installed, and just prior to building acceptance, properly lubricate motors and equipment installed under this Section.
H.Balancing: Adjust fan speed to provide specified output, and prepare report as specified in Section 230593, Testing, Adjusting, and Balancing For HVAC.
I.Roof Curbs: Roof curb is furnished by this Contractor and installed by this Contractor.
3.03 FIELD QUALITY CONTROL
A.Testing: Upon completion of installation of air handling units, startup and operate equipment to demonstrate capability and compliance with requirements. Field correct malfunctioning units, then retest to demonstrate compliance.
3.04 EXTRA STOCK
A.General: Provide (1) complete extra set of filters for each air handling unit. Install new filters at completion of air handling system work, and prior to testing, adjusting, and balancing work. Obtain receipt from Owner that new filters have been installed.
23 74 13 - 1
Packaged CUSTOM Outdoor Central-Station Air Handling Units
MPS Master 2014
Rev. 1
SECTION 23 74 13
3.05 ROOFTOP AIR HANDLING UNIT SCHEDULE
A.Refer to Drawings for schedules.
END OF SECTION
23 74 13 - 1
Packaged CUSTOM Outdoor Central-Station Air Handling Units