MPS Master
SECTION 23 72 19
FIXED PLATE AIR-TO-AIR ENERGY RECOVERY EQUIPMENT
PART 1 - GENERAL
1.01 SUMMARY
A.Section Includes: Include labor, materials, equipment, and accessories necessary to furnish and install airtoair heat recovery units and trim indicated on Drawings and specified.
1.02 SUBMITTALS
A.General: Provide submittals in accordance with Section 013300.
B.Product Data: Provide Product Data for each air handled unit specified, including the following:
1.Certified Fan Performance Curves; with system operating conditions indicated
2.Sound Data Certified to ARI 260; include sound attenuators, when scheduled, with manufacturer's sound rating in dB in each octave band at design conditions
3.Certified Coil Performance Ratings; with system operating conditions indicated
4.Motor Ratings and Electrical Characteristics
5.Casing and Frame Materials, Gauges, and Finishes
6.Dampers; with performance ratings and including housings, linkages, and operators
C.Shop Drawings: Shop Drawings from manufacturer detailing equipment assemblies and indicating dimensions, weights, loadings, required clearances, method of fieldassembly, components, and location and size of each field connection.
D.Coordination Drawings: Drawings for air handling units in accordance with Section 230000, Heating, Ventilating, and AirConditioning (HVAC) General Requirements. Submit with Shop Drawings:
1.Show air handling unit floor plans and section drawn accurately to scale.
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MPS Master
SECTION 23 72 19
2.Show internal air handling unit components. Indicate dimensions between individual components and air handling unit casings.
3.Show mechanical room layout and relationship between components and adjacent structural and mechanical elements. Show required service clearances, including coil removal spaces.
4.Show support locations, type of support, and weight on each support.
5.Show concrete base layouts and locations. Indicate dimensions to structural walls or columns for accurate field placement. Indicate required roughins for piping, including floor drains, and electrical conduits.
6.Indicate and certify field measurements.
E.Wiring Diagrams: Wiring diagrams detailing wiring for power and controls, and differentiating between manufacturer installed wiring and field installed wiring.
F.Product Certificates: Product certificates signed by manufacturers of air handling units certifying that their products comply with specified requirements. Where there are differences, they shall be specifically identified.
G.Maintenance Data: Maintenance Data for air handling units to be included in the Operating and Maintenance Manual specified in Division1 and Section 230100, Operation and Maintenance of HVAC Systems.
H.Miscellaneous:
1.Field installation and assembly instructions for air handling unit casing and internal components.
2.Field test reports indicating and interpreting test results relative to compliance with specified requirements.
3.Field fabrication of components is prohibited, unless addressed in the Specifications within this Section.
4.Submit data on electrical requirements. Include safety and startup instructions.
1.03 QUALITY ASSURANCE
A.Air Coils: Certify capacities, pressure drops, and selection procedures in accordance with current ARI 410 Standard.
B.Air Handling Units:
1.Provide factory assembled air handling units that are the products of a manufacturer regularly engaged in manufacturing units of the size and type specified. Any manufacturer submitting proposals for air handling units shall include published catalog data demonstrating ongoing manufacture of these products.
2.The manufacturer shall review the selection of all components furnished under this Section. Manufacturer shall provide written certification that related components not furnished by them will be compatible with their products.
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Fixed Plate Air-to-Air Energy Recovery Equipment
MPS Master
SECTION 23 72 19
3.System shall meet sound data schedule on the Drawings.
4.Coordination: Coordinate layout and installation of units with piping and ductwork and with other installation.
C.Code Regulatory Requirements:
1.StateBuilding Code
2.Local Codes and Ordinances
3.Local Authority having jurisdiction
D.Air Handling Unit Regulatory Requirements:
1.Unit shall be manufactured in accordance with UL1995 and shall be listed by either UL/CUL or ITS. Units shall be provided with listing agency label affixed to unit. In the event the unit is not UL/CUL or ITS approved, the Contractor shall, at its own expense, provide for a field inspection by a UL/CUL or ITS representative to verify conformance. If necessary, Contractor shall perform modifications to the unit in accordance with UL/CUL or ITS as directed by the representative, at no additional expense to the Owner.
2.Certify air handling units in accordance with ARI 430. If air handling units are not certified in accordance with ARI 430, Contractor shall be responsible for expenses associated with testing of units after installation to verify performance of fan(s). Any costs incurred to adjust fans to meet scheduled capacities shall be the sole responsibility of the Contractor.
3.Certify air handling coils in accordance with ARI 410. If air handling coils are not certified in accordance with ARI 410, Contractor shall be responsible for expenses associated with testing of coils after installation to verify performance of coil(s). Any costs incurred to adjust coils to meet scheduled capacities shall be the sole responsibility of the Contractor.
1.04 DELIVERY, STORAGE, AND HANDLING
A.General: In accordance with manufacturer's installation instructions for rigging, unloading, and transporting units.
B.Shipping: Units shall ship fully assembled up to practical shipping and rigging limitations with protective crating and covering. Disassemble and reassemble units as required for movement into the final location following manufacturer's written instructions. Units not shipped fully assembled shall have tags and airflow arrows on each section to indicate location and orientation in direction of airflow. Shipping splits shall be clearly defined on submittal drawings. Cost associated with nonconformance to Shop Drawings shall be the responsibility of the manufacturer. Each section shall have lifting lugs or shipping skid to allow for field rigging and final placement of section. Lift and support units with the manufacturer's designated lifting or supporting points.
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Fixed Plate Air-to-Air Energy Recovery Equipment
MPS Master
SECTION 23 72 19
1.Special shipping requirements are as follows in order to fit through existing building arrangements:
a.
C.Delivery: Deliver units to site with fan motor(s), sheave(s), and belt(s) completely assembled and mounted in units.
D.Protection: Protect units from physical damage, water and moisture penetration, corrosion, and general construction dirt and debris. Use extraordinary means to ensure units are turned over to the Owner in likenew condition, clean and undamaged.
1.05 PROJECT CONDITIONS
A.Field Measurements: Verify dimensions by field measurements and clearances.
B.Cleaning: Do not operate fans until ductwork is clean, filters are in place, bearings are lubricated, and fans have been commissioned.
1.06 SEQUENCING AND SCHEDULING
A.Coordination: Coordinate the size and location of concrete equipment bases. Cast anchor bolt inserts into pad. Concrete reinforcement and formwork requirements are specified under Division3.
1.07 EXTRA MATERIALS
A.General: Furnish extra materials described below that match products installed, are packaged with protective coverings for storage, and are identified with labels describing contents.
1.Furnish (1) extra set of filters for each air handling unit.
2.Furnish (1) extra set of fan belts for each air handling unit fan.
3.Furnish (1) extra set gaskets for each sectional joint for each air handling unit.
1.08 STARTUP AND OPERATING REQUIREMENTS
A.General: Do not operate units for any purpose, temporary or permanent, until ductwork is clean, until building is clean, filters in place, bearings lubricated (if applicable), condensate properly trapped, piping connections verified and leaktested, belts aligned and tensioned, all shipping braces removed, bearing set screws torqued, and fan has been test run under observation.
1.09 WARRANTY
A.Description: Equipment manufacturer shall provide, at no additional cost, a standard parts warranty that covers a period of 2 years from shipping date at factory. This warrants that all products are free from defects in material and workmanship, and shall meet the capacities and ratings set forth in the equipment manufacturer's catalog and bulletins.
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Fixed Plate Air-to-Air Energy Recovery Equipment
MPS Master
SECTION 23 72 19
PART 2 - PRODUCTS
2.01 MANUFACTURERS
A.Acceptable Manufacturers for Fixed Plate Air-to-Air Energy Recovery Equipment: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Phoenix Air Systems
2.Innovent
3.Xetex
B.Additional Acceptable Manufacturers Requirements:
1.Manufacturers not preapproved, must obtain preapproval in writing from consulting Engineer prior to Bid Date. Alternates shall comply with all performance and features as called for in this Specification.
2.Manufacturer shall clearly define any exceptions made to Drawings and Specifications. Any deviations in layout or arrangement shall be submitted to consulting Engineer prior to Bid Date. Acceptance of deviation(s) from Specifications shall be in the form of written approval from the consulting Engineer. Mechanical Contractor is responsible for expenses that occur due to exceptions made.
2.02 HEAT EXCHANGER
A.Energy Recovery Cell: Airtoair energy recovery unit shall be supplied with a crossflow energy recovery cell and plate separators, and a flat smooth plate transfer surface made from 1100 hardened aluminum. The entire transfer surface shall be visible for thorough inspection. Heat Exchanger must be rated according to ARI Standard 106097.
1.Unit shall have double rolled edge seams with sealed corners, extruded aluminum structural members, heavy gauge aluminum end plates for structural integrity. Unit shall be capable of 10inches of differential pressure.
2.03 STANDARD UNIT STRUCTURE
A.Cabinet: Unit shall be constructed with a welded steel base and an integral steel frame. The exterior of the unit shall be made from 16gauge painted galvanized steel. The painted finish shall be an air dry corrosion resistant enamel. The inner wall shall be 24gauge galvanized steel. The wall panel shall be 2inches thick with 2inches of 1.5pound fiberglass insulation. Outdoor units shall have a 1to12 pitched roof.
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Fixed Plate Air-to-Air Energy Recovery Equipment
MPS Master
SECTION 23 72 19
1.All exterior surfaces of outdoor units shall be finished with vinyl chlorinated lacquer over phosphatized galvanized steel for corrosion protection. Paint colors other than the manufacturer's standard color shall match the paint chip furnished by the Architect.
2.Hinged access doors shall be provided for all components. The handles shall be of the double compression type to ensure an air tight seal.
3.Inlet and exhaust hoods shall come standard with outdoor units.
4.Units shall be provided with lifting lugs that can be used to lift the unit into place or hang the unit from the building structure.
5.Fan motors and other electrical components that are internal to the unit shall be provided with a disconnect, with thermal overload protection, and all internal wiring shall be terminated at an external NEMA electrical box. Electrical work shall meet the requirements of NEC, UL, AMCA, NFPA, and ITS Standards. Units shall be ITS listed.
2.04 PRIMARY DRAIN PANS
A.General Requirements: Drain pans shall be continuously welded Type304 stainless steel.
1.The drain pan shall be designed in accordance with ASHRAE 62.1 being of sufficient size to collect all condensation produced from the coil and sloped in (2)planes, pitched toward drain connections, promoting positive drainage to eliminate stagnant water conditions when unit is installed level and trapped in accordance with manufacturer's requirements.
2.The outlet shall be located at the lowest point of the pan and shall be sufficient diameter to preclude drain pan overflow under any normally expected operating condition.
3.All drain pan threaded connections shall be visible external to the unit. Threaded connections under the unit floor shall not be accepted.
4.Drain connections shall be of the same material as the primary drain pan and shall extend a minimum 21/2inches beyond the base to ensure adequate room for field piping of condensate traps.
5.The installing contractor is responsible to ensure the unit is installed level, trapped in accordance with the manufacturer's requirements, and visually inspected to ensure proper drainage of condensate.
6.Provide float switch that will shut unit down and provide alarm indication on BMS.
2.05 FILTERS
A.General Requirements:
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Fixed Plate Air-to-Air Energy Recovery Equipment
MPS Master
SECTION 23 72 19
1.Provide factory fabricated filter section of the same construction and finish as unit casings. Filter section shall have side access filter guides and access door(s) extending the full height of the casing to facilitate filter removal. Provide fixed filter blockoffs as required to prevent air bypass around filters. Blockoffs shall not need to be removed during filter replacement.
2.Filter type, MERV rating, and arrangement shall be provided as defined in Project Drawings and schedule.
3.Filter Gauges:
a.Provide Dwyer 2000 (photohelic) magnehelic gauges.
b.Magnehelic gauges shall be accurate to plus 2percent of full range.
c.Include static pressure tips.
d.One gauge shall be provided for each pre-filter and final filter bank.
e.Gauges shall be recessed into cabinet casing.
f.Filter sections consisting of pre and postfilters shall have a gauge for each.
4.To allow MPS to standardize on filter sizes for all AHUs, filter sizes shall be consistent and based on full 24inch by 24inch or half 12inch by 24inch sizes. Other sized filters are not acceptable.
B.Quantity of Filters: At time of Substantial Completion, and prior to turning equipment over to Owner, Contractor shall install a complete set of unused, clean filters (prefilter and final filter) in each unit supplying filtered air to the building. Provide (2) sets of prefilters (one during construction and one for Owner at Substantial Completion).
C.Pre-Filters:
1.Pre-filters shall be 30percent efficient, MERV 8 pleated, disposable type. Each filter shall consist of a nonwoven cotton and synthetic fabric media, media support grid, and enclosing frame. The filter shall be listed by Underwriters' Laboratories as Class2.
2.Prefilters shall be installed in prefabricated channel rack.
3.Prefilters shall be liftout where access is available upstream of the filter.
D.Final Filters:
1.Final filters shall be high performance, deep pleated, totally rigid and disposable type. Each filter shall consist of high density microfine glass fiber media, media support grid, contour stabilizer, and enclosing frame.
2.Final filter media shall be of high density microfine glass fibers that are laminated to a nonwoven synthetic backing to form a lofted filter blanket. The filter media shall have an average efficiency of 60to 65 percent on the ASHRAE Test Standard (52to 76) and a MERV 11 rating. Filter media shall have an average arrestance of not less than 99percent on that standard. Filters shall be listed by Underwriters' Laboratories as Class2.
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Fixed Plate Air-to-Air Energy Recovery Equipment
MPS Master
SECTION 23 72 19
3.Holding Frames: ASHRAE holding frames shall be factory fabricated of 16gauge galvanized steel and shall be equipped with gaskets on all (4)sides of the filter and (2)heavy duty positive sealing fasteners. Each fastener shall be capable of withstanding 25pound pressure without deflection and be attached or removed without the use of tools.
4.Final filters shall lift out where access is available upstream of the filter.
2.06 DAMPERS
A.General Requirements: Outside, exhaust, and bypass air dampers shall have 18gauge galvanized steel blades with roll formed stiffeners which effectively make the blade stronger than a 16gauge blade. Frames shall be 16gauge galvanized steel half channel. Dampers shall have extruded vinyl blade edge seals and flexible metal compression type jamb seals.
1.The outdoor, exhaust, and bypass dampers shall be provided with Belimo 2position, 24volt actuators with an integral limit switch. Outside air actuators and damper limit switches shall be wired to the unit starter panel. Hoods with bird screens shall be provided for both outdoor and exhaust air dampers on outdoor units.
2.Bypass damper to be located to allow recirculation of return air to the supply fan during unoccupied conditions. The BMS contractor will open and close this damper.
2.07 FROST CONTROL AND OUTSIDE AIR BYPASS DAMPERS
A.Dampers: Bypass plenum and the Energy Recovery Cell (ERC) shall be fitted with tightly sealed opposed blade face and bypass dampers which are interlocked to the same modulating motor.
1.Outside air bypass shall be equipped with a temperature sensor to prevent freezing in the winter and allow for full outside air bypass when the outdoor temperature and humidity conditions are ideal to replace the indoor air.
2.Defrost System: Factory installed and capable of maintaining at least 85percent of the nonfrosted performance at minus 29degreesC (minus 20degreesF).
2.08 MOTORS AND DRIVES
A.General Requirements:
1.All motors and drives shall be factoryinstalled and run tested. All motors shall be installed on a slide base to permit adjustment of belt tension. Slide base shall be designed to accept all motor sizes offered by the air handler manufacturer for that fan size to allow a motor change in the future, should airflow requirements change. Fan sections without factory installed motors shall have motors field installed by the Contractor. The Contractor shall be responsible for all costs associated with installation of motor and drive, alignment of sheaves and belts, run testing of the motor, and balancing of the assembly.
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Fixed Plate Air-to-Air Energy Recovery Equipment
MPS Master
SECTION 23 72 19
2.Fan motors shall be heavy duty, open dripproof (ODP) high efficiency.
3.Motors shall be selected to operate continuously at 104degreesF (40degreesC) ambient without tripping of overloads. Motors shall have a plus/minus 10 percent voltage utilization range to protect against voltage variation. Motors shall be in compliance with EPACT when applicable.