TO: PLANS AND SPECIFICATIONS FOR: Western District Court of Appeals Air Handling Unit 02 Replacement Kansas City, MO Project No:

Addendum No. 1 TO: PLANS AND SPECIFICATIONS FOR: Western District Court of Appeals Air Handling Unit 02 Replacement Kansas City, MO Project No: 01507-01 Bids Due: Second Submittal: Unchanged: Unchanged: 1 :30 P.M., Thursday, September 24, 2015 5:00 P.M., Monday, September 28, 2015 Bidders are hereby informed that the construction plans and/or specifications are modified as follows: A. SPECIFICATIONS 1. Section 007300 - Supplementary Conditions; revise article 2.0 as follows: Designer: Thom Carson HDR Engineering Inc 8404 Indian Hills Drive Omaha, NE 68114 Telephone: ( 402) 399-1143 Fax: (402) 392-6914 Email: Thomas.Carson@hdrinc.com 2. Section 011000 - Summary of Work; revise article 1.4, paragraph A.2 as follows: Phase Two: Replace Air Handling Unit 02 and all associated ductwork. Work of this phase shall be substantially complete, ready for occupancy within the contract completion time specified on the Bid Form. 3. Delete Section 237329 - Custom Packaged Air Handling units. Replace with new Section 237323- Factory Built Custom Air Handling Units included in the attachment. B. PLANS: 3. Replace sheet E-101 with new E-101 showing revised supply fan VFD/control panel location included in this addendum. C. GENERAL: None

D. ATTACHMENTS: A total of three (3) attachments are included with this addendum: 1. 09/10/ 15 Pre-bid Attendance Sheet (2 pages). 2. Section 237323 - Factory Built Custom Air Handling Units (19 pages). 3. Revised drawing sheet ElOl (1 sheet). BY THE ORDER OF: Michael Qutami, P.E. Project Management Unit - Section Leader Division of Facilities Management, Design and Construction September 17, 2015

Pre-Bid Meeting AHU-02 Replacement Western Court of Appeals Kansas City, MO Project No. 01507-01 September 10, 2015 at 1:00 pm Glenn Smith Project Manager QA-Facilities Management, Design & Construction 573-751-1367 Glenn. Smith@oa.mo.gov Thom Carson Mechanical Engineer/ Designer HDR 402-399-1143 Thomas.Carson@hdrinc.com Jim Milam Construction Administrator QA-Facilities Management, Design & Construction (816) 329-0201 James.Milam@oa.mo.gov Steve Mitchell Building Manager Western Court of Appeals (816) 889-3665 Steven.Mitchell@courts.mo.gov Terence Lord Clerk of the Court Western Court of Appeals (816) 889-3683 Terence.Lord@courts.mo.gov C., I f) 1 m a_r.f,., <J la.c! q "( - Coi.N" )- \)Jf.,,.. " Q..,ou1-t' of: APP2 cl,; g I(,., 1J'81-'sli,\7 c_,'.l\dy. fhc\,hn f? C,.ovrh. mo, "'1C'/ J5,;an r;ckse- C-1 3 Ir1'T rr-i+or.s q,3 - '1..{7-99.5;;.._ ber-7c.)(sen@ c..i 3 o cotv;. J, \, t>i Groq) q,5-c\b 1 -- qy35 j \ N"'\ "'\ @_ yj_ ro1.>? Co rt"\

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2015/09/15 SECTION 23 73 23 FACTORY BUILT CUSTOM AIR HANDLING UNITS PART 1- GENERAL 1.1 SUMMARY A. Furnish labor, materials, tools, equipment, and services for Factory Built Custom Air Handling Units, as indicated, in accordance with provisions of Contract Documents. B. Completely coordinate with work of other trades. 1.2 QUALITY ASSURANCE A. Standards: I. ADC-1062R2, Air Diffusing Equipment Test Code. 2. AMCA-210, Test Code for Air Moving Devices. 3. ASHRAE-70-72, Method of Testing for Rating the Air Flow Performance of Outlets and Inlets. 4. NFPA-90A Standard for the Installation of Air Conditioning and Ventilating Systems, 1993 edition. 5. ARI-410-72, Forced-Circulation Air- Cooling and Air-Heating Coils. 6. AMCA-99 - Standards Handbook. 7. AMCA-204 - Methods and Standards for Fan Balancing. 8. AMCA-210 - Laboratory Methods of Testing Fans for Rating Purposes. 9. AMCA-300 - Test Code for Sound Rating Air Moving Devices. 10. AMCA-301 - Method of Publishing Sound Ratings for Air Moving Devices. 11. AMCA-500 - Test Methods for Louver, Dampers, and Shutters. 12. ANSI/ AFBMA-9 - Load Ratings and Fatigue Life for Ball Bearings. 13. ANSI/AFBMA-11 - Load Ratings and Fatigue Life for Roller Bearings. 14. ARl-410 - Forced-Circulating Air-Cooling and Air Handling Coils. 15. ARI-430 - Standard for Central Station Air Handling Units. 16. ARI-435 - Standard for Application of Central Station Air Handling Units. 17. ASHRAE-62 - Ventilation for Acceptable Indoor Air Quality. 18. UL-508 - Standard for Industrial Control Panels. 19. UL-1995 - Standard for Safety - Heating and Cooling Equipment. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23 - I

B. Construction Standards and Criteria: 1. Unit Construction Pressure Class: 10 IN static pressure, positive and negative. C. Minimum Quality Control Requirements and Performance: 1. Factory balancing: a. Fan wheels and shaft assemblies shall be factory balanced both statically and dynamically to meet AMCA 204 standards for residual unbalance. 2. Fan performance curves: a. Tests shall be conducted in a certified AMCA laboratory in accordance with current AMCA Standards. 3. Leakage: No more than 1/2 percent of scheduled air handling unit cfm at 10 IN static pressure. 4. Panel deflection: No more than 1/240 of an inch. 5. Coils: 1.3 SUBMITT ALS a. Coils shall be factory tested to 325 PSI compressed air under clear water. 6. Air handling units shall be designed and manufactured in strict accordance with UL-1995, Standard for Heating and Cooling Equipment. All units shall be listed and shall bear the UL 1995 label. A. Shop Drawings: 1. Dimensional shop drawings. a. Show casing construction (base, floor, housing); access door hardware; operating weight (point and distributed loads). 2. Filter frames. 3. Fan/motor vibration isolation details. 4. Field connection details. 5. Required clearances. 6. Predicted sound data at eight octive bands for each opening in the unit. B. Product Data: 1. Casing thermal performance. 2. Fan data: a. Sound power levels based on fan arrangement in unit. b. Certified fan curves at following conditions: I) Scheduled operating conditions including initial and final as noted. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-2

3. Filters. 2) 50 percent airflow operating condition (used to evaluate potential surge conditions). c. Computer selections based on schedule performance criteria. d. Motor electrical characteristics. 4. Coil data: a. Computer selections of based on scheduled performance criteria. 5. Dampers. 6. Air Blenders.,.., u.. :r1:+: 1. llulljjull.l\.,l. 8. Sound attenuators. a. Certified test data on dynamic insertion loss, self-noise power levels, and aerodynamic performance for reverse and forward flow test conditions. 9. Vibration isolation components. C. Contract Closeout Information: 1.4 WARRANTY I. Operating and maintenance data including: a. Bearing lubrication instructions. b. Filter replacement instructions. c. Motor and drive replacement instructions. d. Wiring diagrams. 2. Owner instruction report. 3. Factory certified pressure test report on cabinet casing. a. With access doors in place, test to I 0.0 IN TSP: 4. Warranty. 1) Report to factory certify air handling unit cfm leakage rate. 2) Report to factory certify air handling unit panel deflection. A. Provide full parts and labor manufacturer warranty to include all parts, labor, travel time, and incurred expenses. Warranty to cover from date of start up to date of substantial completion, plus an additional 24 month full parts and labor manufacturer warranty from date of substantial completion. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-3

PART 2 - PRODUCTS 2.1 ACCEPTABLE MANUFACTURERS A. Factory Built Custom Air Handling Units: B. Filters: I. Base: a. Huntair. 2. Optional: I. Base: a. York Custom. b. Racan. c. Haakon. d. Temtrol. e. Ventral. f. Govemair. g. Trane. a. American Air Filter. 2. Optional: a. Eco-Air Products. b. Cam-Farr. c. Flanders. C. Other manufacturers desiring approval comply with Section 00 26 00. 2.2 MATERIALS A. Thermal Break Construction: I. Unit shall be guaranteed not to form surface condensation under the following conditions: B. Unit Base: a. Interior dry bulb temperature: 50 deg F. 1. Air handling unit base: a. Material: Heavy duty structural steel channel; formed metal base structure is not permitted. b. Channels: Solid welded at connection points to assure rigidity. I) Perimeter channel: Sized to allow for rigging and handling. c. Base cross supports: Located and sized to support internal components. I) Internal supports: Properly spaced to avoid oil canning of unit floor above. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-4

2) Cope structural members that intersect with open side of channels or add filler piece to assure structural integrity. d. Equipment eight feet wide and wider: Provide with a means of supporting center of unit on a truck. e. Lifting lugs: Add to perimeter channel along longest length of unit or unit module. 1) Position and/or extend each lug to avoid any obstruction which extends beyond unit casing, including piping vestibules, surface mounted electrical or control panels, piping connections, and other appurtenances affixed to the unit exterior housing. 2) Incorporate into each lug a means of attaching a cable or chain. f. Split in maximum size pieces to allow for economical shipment to jobsite. 2. Base drain pans: 1) Coordinate with installation conditions on site. a. Provide as integral part of unit base in following sections: I) Cooling coil section. 2) Humidifier section. 3) Outside air inlet and mixed air sections. b. Double wall construction of type 304 stainless steel. c. Size: 1) Drain pan underliner: Type 304 stainless steel filled with insulation to provide a minimum R-7 insulation assembly. a) Underliner not required for foam insulation. 2) Provide 2-1 /2 IN wide, 12 gauge type 304 stainless steel inverted channels on a maximum of 24 IN centers to reinforce pan to support coils. 1) Minimum width: a) Pitch in direction of air flow to assure water migration. b) Drain pan shall extend a minimum of 12 IN downstream of the cooling coil. c) Drain pan shall extend a minimum of 24 IN beyond the leaving side of the humidification elements. d) Drain pans in mixed air sections: Extend the width of the section. e) Drain pans in outside air inlet sections: (1) Top inlet: extend from the edge of the next upstream component to the edge of the next downstream component. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-5

C. Unit Floor: d. Clearances: (2) Back inlet: extend from the face of the inlet to the next downstream component but no less than 1220 mm 48 IN. 1) Provide adequate clearance, but not less than 2 IN, between bottom of the inverted coil mounting channels and top of the drain pan to allow for visual inspection and cleaning of the drain pan without coil removal. e. Drain pan slope: a) Coil height, including the coil casing material, shall not extend into the drain pan height. b) Coil supports shall be arranged to allow the coil to be removed to one side of the air handling unit by removal of pipe connections and one cabinet wall panel and sliding the coil horizontally (above the drain pan height) on the coil supports. 1) Double or triple slope drain pan, minimum of one percent, and pitched toward drain connection side. f. Provide drain connections on one side of unit where floor drain(s) are located. 1. Air handling unit floor: 1) Construct drain lines of same material as pan. 2) Extend drain lines through perimeter base channel and continuously weld seams/penetrations to insure an air-tight seal. 3) Provide removable cap on each drain connection. a. Minimum 12 gauge G90 galvanized steel. b. Space welds from below floor no greater than 4 IN on center. c. Space welds from top of floor no greater than 1-1 /4 IN on center. d. Drive screw attachment is not acceptable. e. Floor construction: Double wall and constructed to meet L/240 deflection based upon 300 LB concentrated load at mid-span. f. For adequate support, provide a base structural member centered under edges of each sheet of flooring material. 1) Seal floor seams with a continuous bead polyurethane sealant. 2) Base supports above floor are not acceptable due to hazards to service personnel. g. Overlap floor on perimeter base channel to allow a means of attaching cabinet panels from exterior without penetrating structural steel. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-6

D. Unit Housing: h. Lay floor flat and flush with top surface of base channel. I. Air handling unit housing: a. Wall construction: I) Double wall, panelized construction such that all internal components can be easily accessed for service or removal without removal or disassembly of any exterior wall sections or panels or roof sections or panels. 2) Material: G90 galvanized steel. a) Minimum 20 gauge for foam insulation construction. b) Minimum 16 gauge for fiberglass insulation construction. 3) Deflection: L/240 at static pressure equivalent to Unit Construction Pressure Class. b. Outdoor air handling units: 1) The air handling unit shall be specifically designed for outdoor application. 2) Roof curb: Prefabricated, 12 GA galvanized steel mounting curb designed and manufactured by unit manufacturer for exterior units only. a) Verify field conditions prior to unit shipment. b) Complete perimeter support of unit. c) Minimum 16 IN high. d) Nominal 2 x 4 IN wood nailer strip. e) Provide gasketing for field mounting between unit base and curb. 3) Roof panels: Sloped or bowed roof with a minimum of 1/4 IN/FT slope to ensure rain runoff. 2. Supply and return openings: a) Provide a rain lip or gutter around perimeter of roof to prevent water from running down side of unit. Provide rain lip above doors and intake louvers. a. For supply air, provide openings with rectangular, round, or oval wide radiused, bellmouth fittings and duct collars to accept supply and return air connections as indicated. b. Provide removable G90 galvanized steel grating over floor openings inside of air handling unit. 3. Unit split modules: 1) Weight support: capable of supporting 300 pounds. 2) To avoid tripping hazard, grating shal l be flush with the finished floor of the unit. a. Provide necessary hardware to reassemble equipment such as bolts, nuts, washers, sealant, and slip cleats. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-7

b. Mark each corresponding module of cabinet with matching letters to assist in reassembly. 4. View windows: provided in access doors. E. Unit Insulation: a. View window frame: Fabricated from 16 gauge galvanized steel. b. Provide 3/4 IN thick thermopane wire glass window. c. Seal window frame to cabinet with open cell gasket on sides to ensure an air tight seal. d. Window open viewing size: 12 IN x 12 IN. e. View windows at sections with UV lights (installed or noted for future install): Provide UV filtering glass. 1. Air handling unit insulation - general: F. Unit Liners: a. Meet NFPA-90A smoke and flame spread requirements. b. Provide insulation materials with facings that will not promote microbial growth. c. R-value of wall, roof and floor assemblies: minimum ofr-12. d. Type: Foam or fiberglass. 1. Liners - general: a. As a protective cover for insulation, provide liners on the interior of the air handling unit integral parts of the exterior panel system. b. Consolidate internal reinforcing as well as interior lining surface into one piece. 2. Solid liner: 1) Allow attachment of interior liner to cabinet without exposing any drive screws or bolts which can be hazardous to service personnel. 2) Provide a smooth, uninterrupted surface. 3) Exposed reinforcing is unacceptable due to impedance of air performance. a. Liner material: Minimum 20 gauge G-90 galvanized steel, except where specifically indicated otherwise. b. Do not allow exposure of any insulation to air stream. c. Fabricated from a solid sheet without any perforations. d. Cover openings and comers to completely contain insulation. 3. Perforated liner: a. Liner material: G-90 galvanized steel. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-8

G. Unit Finishes: I. Exterior finish: Wall and roof panels. a. One coat of polyurethane primer and one coat of polyesterhybrid semi-gloss top coat. 2. Base finish: I) Prime and top-coat panels on both sides. 2) Color: Manufacturer's standard. 3) Paint system shall pass a minimum of I 000 hour salt spray test per ASTM-B 117. a. Alkyd enamel. I) Provide industrial grade alkyd enamel red oxide primer by air brush to 2 mils thickness. 2) Provide alkyd enamel top coat with air brush to 2-3 mills thickness. b. Color: Manufacturer's standard. 3. Fan assembly finish: a. One coat of polyurethane primer and one coat of polyesterhybrid semi-gloss top coat. I) Prime and top-coat panels on both sides. 2) Color: Manufacturer's standard. 3) Paint system shall pass a minimum of I 000 hour salt spray test per ASTM-B 117. b. Aluminum fans shall not require paint finish. 4. Interior finish : H. Fan Assembly a. Paint non-galvanized or welded surfaces with red oxide primer and machinery gray enamel. 1. Performance ratings: rated in accordance with laboratory tests conducted in accordance with AMCA Standard 210. 2. Ratings: As indicated. 3. Arrangement: As indicated 4. Drive sheaves: Cast iron with split taper bushings dynamically balanced at factory. a. Provide wide range variable speed, adjustable sheaves to be used for balancing systems. 5. Provide final fixed pitch drive sheaves for proper RPM determined during balancing process. 6. Fanwall Technology (Plurality of fan arrangements): a. Multiple direct driven, arrangement 4 plenum fans constructed per AMCA requirements for duty specifi ed, (Class I, II, or III). FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-9

b. Multiple fan/motor "cells", spaced in the air way tunnel to provide a uniform air flow and velocity profile across the entire air way tunnel cross section and components contained therein. c. All fans shall be selected to deliver design air flow at the specified operating TSP (Total Static Pressure) at the specified motor speed as scheduled. d. The fan array shall be selected to operate at a system TSP that does not exceed 90% of the specified fan's peak static pressure producing capability at the specified fan speed. e. Performance: 1) The fan array shall produce a uniform air flow profile and velocity not to exceed the specified cooling coil and filter bank face velocity when measured at a point 12 IN from the intake side of the Fan Wall array septum wall, and a distance of 42 IN from the discharge side of the Fan Wall array septum wall. 2) Fan shall be structurally designed to withstand the maximum motor RPM at 60 hertz. 3) The fanwall array shall be installed such that the optimum system operating efficiency may be achieved by manually, or automatically, enabling or disabling fans in the array to provide the minimum connected HP for the Fan Wall array that is necessary to produce the required air flow and pressure in the system. The Fan Wall shall be configured such that the connected HP at reduced flow conditions may be less than the installed total HP of the Fan Wall array in order to achieve optimum system efficiency. Each fan cube shall be individually wired to a control panel containing a single VFD(s) for the total connected HP for all fan motors contained in the Fan Wall array. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-10

4) The Fan Wall Array shall be provided with acoustical silencers that reduce the bare fan discharge sound power levels by a minimum of 15 db re I 0/\-12 watts throughout the eight octave bands with center frequencies of 125, 250, 500, I 000, 2000, 4000, and 8000 HZ when compared to the same unit without the silencers. The silencers shall not increase the fan total static pressure, nor shall it increase the airway tunnel length of the Air Handling Unit when compared to the same F ANW ALL unit without the silencer array. a) Alternate manufacturers must submit acoustical data for review and approval prior to the bid indicating that the proposed alternate equipment can meet all specified performance requirements without impacting the equipment performance or design features including duct connection location, unit weights, acoustical performance, or specified total fan HP for each fanwall array. Proposals submitted which indicate a higher connected fan HP than specified or scheduled will not be accepted. f. Fan/motor cartridge: 1) Each fan/motor cartridge shall consist of: g. Balancing: a) Steel intake wall: 11 gauge A60 galvanized steel. b) Inlet funnel: 14 gauge spun steel. c) Motor support plate and structure: 11 gauge A60 galvanized steel. d) All components to be powder coated epoxy for enhanced corrosion resistance. e) Motors: See section 20 05 00. (I) Shall be selected by the manufacturer and suitable for array application. f) Each fan/motor cartridge shall be removable through a 30 IN wide, free area, access door located on the discharge side of the fan wall array. 1) Each fan array and assembly shall be dynamically balanced to meet the following requirements of AMCA standard 204: a) Category: BV-5. b) Grade: G 1.0. h. Drives and wiring: c) Residual unbalance: equal to or less than.0028 ozin/lb ofrotor mass. 1) Each fan motor shall be individually wired to a control panel containing a single, sized for total connected horsepower for the Fan Wall Array. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-11

I. Economizer 2) Wiring sizing shall be determined in accordance with NEC standards. 1. Safety screens at fan discharge: Provide on all fanwall array discharge modules. J. Sound Pressure Levels: 1) Unit inlet and outlet discharge sound pressure levels and radiated sound pressure levels shall not exceed the values scheduled for the or alternate single direct drive plenum fan. 2) Alternate fan systems: 1. Economizer section includes: a) If alternate conventional fan systems are proposed by the contractor it shall be the responsibility of the contractor proposing the alternate to guarantee that noise levels in the occupied space will not exceed the basis of design fan array system. b) Any acoustical treatment for alternate fan systems must be approved by the engineer and architect prior to installation, and any such acoustical treatment or subsequent treatment will be done at the sole expense of the contractor proposing the alternate fan system. a. Dampers and linkage for return air, outside air, and exhaust/relief air. b. Drain pan. 2. Dampers, control: a. Provide control dampers for return, outside and exhaust/relief air. 1) Control dampers: As specified in Section 23 31 00, factory mounted. 2) Damper actuators: As specified in Section 25 50 00, field or factory mounted. 3) Size dampers with 1500 to 1800 FPM air velocity. 4) Outside and return air dampers: Parallel blades arranged to provide convergent airflow to minimize stratification. 3. Drain pan: double sloped to assure positive condensate drainage with connections on one side located adjacent to floor drain. The pan shall be of double wall construction with a stainless steel liner and have a minimum of 2 IN of insulation (uncompressed). The pan shall have a minimum depth (free-board) of 2 IN. J. Filter Banks I. Filter banks (filter frames with filters) - General: a. Factory fabricate as part of air handling unit. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-12

K. Coils b. Mount filter bank in air handling unit. 2. Filter frames - General: 3. Filters: I) Continuously bond periphery of filter frame to inside of air handling unit to eliminate air bypass. a. Provide frames compatible with filters scheduled. b. 16 gage galvanized steel. c. Equip frame with protective diagonal support members on both air entering and air exiting sides of filters. d. Equip frame with gaskets and heavy-duty, positive-sealing fasteners capable of being attached or removed without use of tools. e. Filters shall be accessible from inside the unit. a. Capacities and types: 30% filter section. b. Locations: As scheduled. c. UL Class 2 listed. d. Provide quantities and standard sizes to match requirements of air handling unit. 4. For filter bank, provide Dwyer Series 2000 magnahelic filter gauges, with adjustable signal flag and sun shield enclosure for outdoor units. 5. Provide walk-in filter access sections upstream of filter rack with adequate space available for filter service. I. Coils - general: a. Certified in accord with ARI 410. b. Coil capacity, size and type: As scheduled. c. Arrange coils for easy removal. d. Coil support rack: I) Mount coils on support rack. 2) For stacked coils, lower coil sections shall be capable of being removed without disturbing upper coil sections. 3) Rack construction: a) Heating coils: 16 gauge G90 galvanized steel b) Cooling coils: 16 gauge 304 stainless steel. e. Blank off coil ends to ensure air passes through the coils. 1) Heating coils: 12 gauge G90 galvanized steel 2) Cooling coils: 12 gauge 304 stainless steel. f. Working Pressure Rating: 1) Water coils: 250 PSIG. FACTORY BUILT CUSTOM AIR HANDLING UN ITS 23 73 23-13

2) Steam coils: 50 PSIG. g. Temperature Rating: 300 deg F. h. Coil Connections: 2. Water Heating Coils: l) Threaded connections located on same end, except where otherwise noted or shown. 2) Coil headers, distributors and connections completely enclosed in unit casing. 3) Water coil vent and drain connections: a) Provide for each section. b) Extend all vents and drain lines to the exterior of the unit housing. c) Locate on the same side of the unit as the supply and return piping. d) Interior manifolding of individual coil drain and vent lines, prior to extending to the unit exterior is not acceptable. a. 5/8 IN OD copper tubes, 0.025 IN wall; 0.035 IN wall on return bends. b. Minimum 0.0075 IN thick aluminum fins, spiral or plate fin design. 1) The maximum fin spacing shall be 10 FPL c. 16 gauge G90 galvanized steel casing. d. Non-ferrous, copper headers. 3. Chilled Water Cooling Coils: a. 5/8 IN OD copper tubes, 0.025 IN wall; 0.035 IN wall on return bends. b. Yi IN OD copper tubes, 0.017 IN wall. c. Minimum 0.0075 IN thick aluminum fins, plate fin design. 1) The maximum fin spacing shall be 10 FPL d. 16 gauge type 304 stainless steel casing. e. 16 gauge G90 galvanized steel casing. f. Non-ferrous, copper headers. 4. Intermediate condensate drain pans: a. On stacked cooling coils, provide intermediate pan to prevent condensate from upper coil(s) from passing over lower coil(s). b. Intermediate drain pans shall be insulated with 1 IN elastomeric insulation on the underside to prevent condensation formation and moisture carry-over due to adiabatic condensation formation on the intermediate drain pans. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-14

L. Access Doors c. Fabricated from same material and in same style as base drain pan. d. Provide I IN diameter, 304 SS or copper down spouts from upper pan(s) to lower pan(s). 1. Access doors: Hinged, double wall, insulated, thermal break type. a. Provide in following sections: I) Fan sections. 2) Access sections. 3) Filter sections. 4) Humidifier section. 5) Supply and return plenums. 6) Section(s) where damper(s) are located (such as economizer section). b. Provide additional access doors where shown on drawings. c. Door construction: I) Door size, minimum: 24 IN wide x 72 IN high. 2) Size door(s) to accommodate removal of following equipment through the door(s): a) Motors. b) Humidifier manifold. 3) Exterior door skin: Same material and finish as unit housing. 4) Door interior liner: Same material and finish as interior liner of section in which door is installed. 5) Access door perimeter: One piece, welded. 6) Insulation: Same as unit wall insulation. d. Door frame: One piece, welded. e. Gasketing: l) Provide full circumference gasketing with a closed cell, replaceable neoprene gasket. 2) Provide gasketing system that allows for easy removal for replacement. 3) Provide system that will maintain a tight seal without assistance of operating pressure. f. Hinges and latches: I) Provide corrosion resistant, fully adjustable hinges and latches to allow for maintenance of a tight seal between door and unit as gasketing material compresses over time. 2) Provide stainless steel, removable hinge pins to allow door to be easily removed during servicing. 3) Leaf and Piano type hinges are not acceptable. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-15

M. Pressure Relief Doors 4) Provide for padlocking of latches to fan sections. 5) Latch and paw assemblies: One piece, bolted together. g. Hinge access doors so they open against unit operating pressure unless otherwise indicated. 1. Pressure relief doors: Provide vertically mounted pressure relief doors in the supply air plenum and the return air plenum. N. Electrical a. Quantity: As indicated. b. Frame: 12 GA galvanized steel, Z shaped. c. Door: 12 GA galvanized steel. d. Seal: Polyurethane foam around door perimeter. e. Pressure setting: 1) Supply plenum: 5 IN WG positive. 2) Return plenum: 3 IN WG negative. f. Springs: Negator type for door closure upon loss of over pressurization. g. Size: 18 IN x 18 IN. h. Insulation: For the supply plenum pressure relief, provide I IN thick foil faced insulation on the inside surface. 1. Comply with Section 23 31 13. I. Wiring to comply with NEC requirements and conform with applicable U/L standards and Electrical Specification Divisions. 2. Each unit shall be wired and tested at the factory before shipment. 3. Provide separate factory wired branch circuits for each supply and return air fan motors. Terminate with junction boxes at unit exterior. 4. Variable frequency drives for exterior air handling units: 5. Lights: a. Factory mount VFD(s) in ventilated compartment integral with air handling unit. b. VFD(s) to be mounted and pre-wired to motor. c. VFD(s) to be interfaced with and controlled by Owners existing Building Automation System (BAS). Physical interface and control work to be accomplished under future building fit-up package. a. Provide one factory installed light for each air handling section which has an access door. b. Fixture: Incandescent marine type. FACTORY BUILT CUSTOM AIR HANDLING UNlTS 23 73 23-16

c. Each fixture shall be controllable from externally mounted light switch with pilot light. Exterior units shall have weatherproof switch. 6. Outlets: 2.3 VIBRATION ISOLATION d. Provide a separate 120 volt factory wired circuit for unit lights. Terminate circuit at junction box at unit's exterior. e. At shipping sections, provide additional junction boxes on each module to allow the installer to make final connections in the field. I) Clearly label wiring to ease final interconnections. a. Rounding up to the next highest number, provide a minimum of one factory installed double grounded GFCl receptacle per 10 foot of air handling unit length (For example, a 43 foot long unit would require 5 receptacles.). Exterior units shall have weatherproof receptacles. b. Provide a separate 120 volt factory wired circuit for unit receptacles. Terminate circuit at junction box at unit's exterior. c. At shipping sections, provide additional junction boxes on each module to allow the installer to make final connections in the field. I) Clearly label wiring to ease final interconnections. A. Vibration isolation: See Section 20 05 50. 2.4 UNIT TESTING A. Air leakage: Factory pressure test unit to positive and negative IO IN WG and eliminate all noisy leaks. Leakage shall not exceed 1 /2 percent of unit design airflow volume. Submit test report. B. Panel deflection test: I. Panel deflection checks shall be done in conjunction with and at pressures stated in pressure leak test. 2. Once unit is leak tested and determined to be acceptable, a panel deflection test may be conducted. Deflection will be measured at four ( 4) points around the cabinet. Each point will be located at the largest unsupported span for the side. A dial micrometer will be placed against panel seam at the mid-point of the panel height. The cabinet will be pressurized to the specified static load and the deflection will be measured. 3. Pass/Fail criteria will be based on 1/240 of the panel span as a maximum allowable deflection at specified static load. 4. Submit test report. C. The above test described in Paragraph "A" and "B", shall be performed at the manufacturer's facility prior to shipment. FACTORY BUILT CUSTOM AIR HANDLING UNfTS 23 73 23-17

D. The Owner/ Architect shall be given the option to witness the tests at their own expense. PART 3 - EXECUTION 3.1 INSTALLATION A. Field assemble air handling unit modules in accordance with manufacturer's installation drawings and instructions. I. Assemble unit complete with vibration isolation components. 2. Sealing and fastening hardware shall be supplied by air handling unit manufacturer. 3. Pour concrete for fan inertia bases. 4. Provide lamps for lights. B. Touch-up abraded or damaged finish. C. Provide a trap on drains at jobsite on exterior of unit. I. Traps shall be adequate to maintain a water seal while equipment is in operation D. Coordinate with Section 25 50 00 for location of water valves, temperature sensors, and damper operators. E. Install final fixed sheaves furnished by air handling manufacturer. F. Provide fan dynamic balancing services as specified in Section 23 35 00. 3.2 ST ART-UP A. Provide services of factory trained service technician to inspect units after erection, perform minimum 16 hour startup service and perform concurrent Owner instruction. I. File written report and include in maintenance manual. 2. Coordinate startup with Test and Balance provider and Temperature Controls provider. B. Equipment Startup: I. Unit start-up to take place at completion of future Fit-up package work. 2. Prior to the engineer's scheduled startup, complete the following: a. Ensure automatic temperature controls work is complete. b. Tum on power, and "bump" unit motors to verify correct fan rotation. c. Remove shipping materials. d. Ensure that spring isolated components are off shipping supports. e. Level spring isolated components. FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-18

f. Install filtration media in equipment. I) Replace filters used in construction. g. Complete piping and duct connections. 1) Complete leak checks on water piping prior to startup. h. On multiple piece units, complete interconnections ( electrical, piping and ductwork) and roof joints. 1. Make startup requests to manufacturer two weeks prior to scheduled date. 3. Temperature control and air balance providers shall be on site at time of equipment startup. END OF SECTION FACTORY BUILT CUSTOM AIR HANDLING UNITS 23 73 23-19