city of tampa · · 2011-08-17city of tampa contract administration department ... remain in full...

CITY OF TAMPA

CONTRACT ADMINISTRATION DEPARTMENT

David L. Vaughn, AIA, Director

306 E. Jackson Street, 4N • Tampa, Florida 33602 • (813) 274-8456 • FAX: (813) 274-8080

Bob Buckhorn, Mayor

ADDENDUM NO. 2

DATE: August 17, 2011

Project: 11-C-00058; TMOB HVAC Systems Upgrade 6th and 7th Floors Bidders on the above referenced project are hereby notified that the following addendum is made to the Contract Documents. BIDS TO BE SUBMITTED SHALL CONFORM TO THIS NOTICE.

Item 1: Plans, Sheet G-1, MECHANICAL SCOPE; Third Paragraph; DELETE “WHILE DDC

CONTROL OF THE NEW MECHANICAL SYSTEMS IS NOT PART OF THIS CONTRACT” and replace with the words: “INSTALLATION OF THE DDC CONTROL OF THE NEW MECHANICAL SYSTEM IS INCLUDED IN THIS CONTRACT AND”.

Item 2: Specifications, 5950-5; PRODUCTS; Fourth Paragraph; DELETE in its entirety and

replace with: “KMC Controls is to be the basis of design for the Manufacturer of DDC Control system”.

Item 3: Specifications, Page 15950-6; WORK INCLUDED; First Paragraph; DELETE (BY OWNER) from: “Installation of Direct Digital Control System (DDCS)”. ADD to end of the

section: “The DDC Control System scope of work shall be an extension of the existing KMC control system installed on the other floors of the building and shall perform seamlessly with it”.

Item 4: Specifications, Section 15850; DELETE entire section and replace with attached Section 15850

revised August 15, 2011. Item 5: Plans, Sheet M-1.1, VARIABLE FREQUENCY DRIVE; DESIGN MANUFACTURER &

MODEL NUMBER FOR VFD’S 4 & 5; DELETE ABB ACS 550 AND REPLACE WITH ABB ACH 550.

Item 6: Plans, Sheets M-2.1 and M-2.2, KEY NOTE 15; REMOVE in its entirety and replace with the

note: Existing wall mounted sensors shall be reused for VAV boxes. If additional VAV boxes are added to increase the current number of zones on the floor. New wall mounted sensors will be provided for the additional zone.

Item 7: Plans, Sheet M-4.1; TYPICAL VAV TERMINAL CONTROL AND POINTS WIRING

DIAGRAM; DELETE note and note box concerning the new zone sensor w/ humidity option. Item 8: Plans, Sheet G-1; SCOPE OF WORK, First Paragraph; DELETE last sentence in its

entirety.

Item 9: Plans, Sheets A-2.1 and A-2.2; KEY NOTE #1 Clarification; DELETE note in its entirety and

replace with the following: Existing ceiling grid and tile shall remain in all North and East wings on each floor. Tile, grid and electrical items in lobbies shall be removed and replaced with new grid, tile and associated electrical and mechanical items. Support all conduits above ceiling during installation. Coordinate all trades and work items for a complete project.

Item 10: Specifications, Page 15950-1; DESCRIPTION OF WORK; DELETE last sentence in its

entirety and replace with the following: “All control wiring shall be installed in EMT and in compliance with Division 16”.

All other provisions of the Contract Documents and Specifications not in conflict with this Addendum shall remain in full force and effect. Questions are to be e-mailed to Contract [email protected] Jim Greiner

Jim Greiner, P.E., Contract Manager

mailto:[email protected]

TMOB – HVAC RENOVATION Project BS0501

INDOOR CUSTOM AIR HANDLING UNITS 15850 - 1

SECTION 15850 – INDOOR CUSTOM AIR HANDLING UNITS (REVISED 8-15-11) PART 1 - GENERAL RELATED DOCUMENTS Drawings and general provisions of Contract, including General and Su pplementary Conditions and Division 1 Specification Sections, apply to work of this Section. DESCRIPTION OF WORK Extent of air handli ng unit work i s indicated on drawings and schedules, and by re quirements of this section. Roof mounted air handling units are units located outdoors or placed within a non-air conditioned space. Provide control wiring as work of this Section, complying with requirements of Division 16; power wiring shall be by Division 16. QUALITY ASSURANCE Manufacturer’s Qualifications: Firms regula rly engaged in man ufacture of packa ged or custom ai r handling units with chara cteristics, sizes, and capacities required, whose products have been in satisfactory use in similar service for not less than five years. AMCA Compliance: Test and rate air handling units in accordance with AMCA standards. ARI Compliance: T est and rate air handling units in acco rdance with ARI 430 “Standard for Central Station Air Handling Units.” Display certification symbol on units of certified models. ASHRAE Compliance: Construct and install refri gerant coils in accordance with ASHRAE 15, “Safety code for Mechanical Refrigeration.” NFPA Compliance: Provide air h andling unit internal insulation having flame spread rating not over 2 5 and smoke developed rating no higher than 50; and complying with NFPA 90A-1993, “Standard for the Installation of Air Conditioning and Ventilating Systems.” UL and NEMA Compliance: Provide el ectrical components required as part of air ha ndling units, which have been listed and labeled by UL and comply with NEMA standards. Comply with the latest approved edition of the “Florida Energy Code for Building Construction.” SUBMITTALS Submit shop drawings and product data to include the following. Dimensioned plans, elev ations and details, incl uding motor starter and control cabinets required clearances and location of all field connections. Summary of all utility requirements such as: electricity, chilled water, stream, brine, ai r, etc. Summary shall indicate quality and quantity of each required utility. Ladder-type schematic drawing of the power and ancillary utility field hookup requirements, indicating all items that are furnished.

Contract 11-C-00058; TMOB Climate Control (HVAC) Systems Upgrade 6th And 7th Floors



Manufacturer’s performance of each unit. Selection shall indicate, as a minimum, the following:

Input data used for selection

Model number of the unit

Net capacity for all heat transfer coils stating conditions used.

Rated load amp draw

Noise levels produced by equipment

Fan curves, shown on a family of curves diagram

Approximate unit shipping and operating weight for each section

Finish and color chart

Filter areas and velocities OPERATION AND MAINTENANCE DATA Include data on desi gn, inspection and procedures related to preventative maintenance. Operation and Maintenance manuals shall be submitted at the time of unit shipment. PART 2 -PRODUCTS ACCEPTABLE MANUFACTURERS Acceptable manufacturers must meet or exceed t he proposed specifications: Temtrol, Trane Custom, Governaire, York International, Inc. and Buffalo Air Handling. GENERAL All units shall be of the size and type a s indicated on the contract drawings. Units shall be completely factory assembled and tested. Th e unit pe rformance, including cooling, heating, humidifying, dehumidifying, ventilating, exhausting capacity shall meet or exceed that indi cated on the drawing and shown in the schedules. Tags and decals to aid in service or indicate caution areas shall be provided. Operation and maintenance manuals shall be furnished with each unit. Units shall be constructed in a watert ight and airtight manner. The ma nufacturer’s standard cabinet construction shall result in a unit leakage rate that shall not exceed 1% of unit capacity at 1.25 times the operating static pressure.

UNIT CONSTRUCTION BASE AND FLOOR CONSTRUCTION The unit base shall be constructed on a minimum of 5" tubular, 12-gage full perimeter channel base with 4" thick, 3 lb. density insulation under the floor. The under-floor insulation shall be protected with a 20-gage galvanized cover sheet. The unit base and floor shall be designed so that deflection is limited to no more than 1/240 of span dimension at unit operating pressures. The base frame shall be provided with lifting lugs, a minimum of (4) per section. Interior floor is to b e constructed of minimum 16-gage, 304 stainless steel. Drain pan must be continuously welded positively double-sloped 16-gage, 304 stainless steel with a minimum depth of 2" at the drain. The drain pa n shall be insulated with 4", 3 lb. density fiberglass. Each drain pan section shall have a properly sized MPT drain connection for positive drainage and extend a minimum of 24" beyond the leaving face of the coil.




Where required, the units shall be shipped in multiple sections and be engineered for field reassembly and testing. The unit shall be provided with full le ngth perimeter angles located inside at the shipping splits to allow for field bolting with h ardware and reassembly of each modular section. The unit manufacturer shall provide necessary hardware, tape, sealing gasket and caulk required to field join and seal each modular section. The mating upper frame of each section shall be fabricated with a flanged perimeter. The flanged perimeter shall be drilled with assembly clearance holes and be continuously gasketed. WALL AND ROOF PANELS: Casing shall be double wall construction with exterior wall and roof panels of 16 gage G90 galvanized steel with 2" 3 lb./cu. Ft. insulation. Panels are to be constructed with an integral thermal break. Panel flanges are to have full length se aled gasket tape sealer in between the panels and externally caulked with sealant. The exterior wall shall be flush with no external standing seams. Exterior casing shall be painted with a polyester resin paint system that is designed for long term corrosion resistance meeting or exceeding (ASTM B-117) Salt Spray Re sistance at 95 degrees F. 1,000 hrs. and (AST M D-2247) Humidity Resistance at 95 degrees F. 1,000 hrs. The inner walls and ceilings shall be all a minimum of 20 gage 304 stainless steel. The manufacturer’s standard cabinet construction shall result in a unit leakage rate that shall not exceed 1% of unit ca pacity at 1.25 times t he operating static pressure. The unit wall and roof p anels shall be designed so that defle ction is limited to no more than 1/240 of span dimension at unit operating pressures. The double wall solid casing panels shall be rated for sound transmission loss in accordance with ASTM E413-73 and have minimum values as shown based on 2", 3 lb. fiberglass solid double wall:

Octave Band (Hz) 2 3 4 5 6 7 Transmission Loss (dB) 14 29 44 46 50 51

Access Doors: Access d oors shall b e double wall and completely insulated between the interior and exterior sheet metal of the door. Doors shall be attached to a 2" thick extruded aluminum frame that has an integral thermal break. High compression latches operable from both sides of the door shall be used. All access doors shall be gasketed around the complete perimeter. Doors shall be minimum 24" x 60" and shall open against the section’s operating pressure. Provide Ventlok #699 test ports in all doors for use by T&B contractor. Fan Wall System (ADDED 8-15-11) The FanWall system consists of multiple, direct driven, arrangement 4, airfoil plenumfans spaced in the air tunnel to provide a uniform air flow and velocity profile. TheFanWall array shall be constructed per AMCA requirements for the duty/Class specified.All fans shall be selected to deliver the design airflow at the specified operating TSP at the specified fan/motor speed. The FanWall array shall be selected to operate at a system TSP that does not exceed 90% of the specified fans’ peak pressure producing capability and at the specified fan speed. Each fan motor shall be individually wired to a control panel which includes overloads for each motor. The control panel will be wired to redundant VFD’s, as specified elsewhere. Redundant VFD’s allow the fan array to maintain both design CFM and TSP if the first VFD fails. Wiring sizing shall be determined and installed in accordance with applicable NEC standards.




The FanWall array shall be provided with Coplanar silencers for sound absorption. The silencer shall reduce the bare fan discharge sound power levels by a minimum 15 db throughout the 125-8000 Hz octave bands when compared without silencers. The silencers shall not increase system Total Static Pressure or fan brake HP. Each fan in the array shall be provided with an Inlet Airflow Straightener to reduce bare fan inlet sound power levels. Motors shall be TEAO enclosure selected at the specified voltage and RPM. Motors shall be premium efficiency; IEEE inverter duty rated which meet NEMA MG 31, part 1 requirements. Each motor shall include an AEGIS bearing protection ring to prevent EDM damage to motor bearings. Each fan/motor combination shall be dynamically balanced to meet AMCA Standard 204-96 category BV-5, Grade 1.0 with peak-to-peak deflection equal to/or less than 0.08 mil at design operating speed of the fan/motor cartridge. The fan array shall be supplied with a factory mounted airflow measurement systemconsisting of (1) static pressure and (1) total pressure tap located in each fan’s inlet cone.The airflow measurement system shall not obstruct the fan inlet and have no effect on fan performance or sound power levels. Include Dwyer MS transmitters to provide a 4-20 ma/0-10 vdc output signal for use in the BAS as specified elsewhere. Alternate manufacturers without FanWall must submit performance and acoustical data for review prior to the bid. Submittals which indicate higher acoustical properties, or higher connected fan HP will not be accepted. Alternate submittals which change duct connection locations or exceed unit total weights will not be acceptable. Each fan/motor cell shall be supplied with individual back draft dampers equal to TemtrolFBD. Frames shall be 0.125” and blades to be 0.070” thick extruded aluminum. COILS All coils shall meet or exceed the capacities specified on the mechanical equipment schedule. All wate r coil performances shall be certified by the man ufacturer to be in accordance with A RI Standard 41 0. Cooling coils shall be mounted in the u nit for horizontal airflow. Coil ai r face velocities shall not exceed 450 fpm for the cooling coils. Coils shall be provided with 304 stainless steel racks for independent coil removal so that, in the case of stacked coils, the bottom coil can be removed without removing the top coil. All hydronic coils shall be tested to 3 15 psig compressed air under water. Coil s shall be designed to operate at 2 50 psig internal pressure. Coil casings shall b e constructed of a minimu m of 16 g age continuous type 304 stainless steel for the cooling coils and galvanized steel for the heating coils. Coil casing reinforcements shall be required for fin lengt hs over 48". No individual coil shall ex ceed 51" in height. Coil fins shall be a minim um of 0.006" thick alu minum plate wit h internal tubes that shall be rou nd seamless ½” or 5/8" of a minimum of .025 wall copper tubes. The copper tubes shall be mechanically expanded to the aluminum fins. The fin spacing shall be as required to meet the capacities listed not to exceed 12 fins per inch. All hydronic coils shall be drainable with a 0.25" F.P.T. plugged drain or vent rap on the supply and return headers. Seamless copper tube shall be brazed to the copper supply and return headers.




Cooling coil sections shall have a pitched drain pan constructed from 16 gage type 304 stainless steel as described in Section 2.03. Coil condensate drain pan shall be completely insulated. If coils are stacked, a sloped 304 stainless ste el intermediate drain pan with recessed drain connection is p rovided. This intermediate pan shall drain to the bottom main pan . Plastic drai n pans and plastic lines shall not be acceptable.

FILTERS

Filter holding frames shall be heavy duty construction designed for industrial applications. Holding frames applied in l ow efficiency filter applications will be either upstream or downstream accessible. Holding frames applied in high efficiency filter applications will be upstream accessible . Holding frames shall be constructed from no less than 16 gage galvanized steel. They shall be equipped with foam gaskets and mechanical latching devices. Filter fasteners shall be capable of being installed without the requirement of tools, nuts or bolts. The holding frame shall be designed to accommodate standard size filters with the application of the ap propriate type fastener. Holding frame assemblies shall meet or exceed area specified by the mechanical schedule.

Medium Efficiency, Pleated Prefilters: Pleated filters shall be 4" thick, 65% efficient. Filter media shall be 100% synthetic. The filters shall be li sted as Class II under UL Standard 900. Filters shall be tested per ASHRAE Standard 52-76. The effective media shall not be less than 4.6 squa re feet of me dia per 1.0 square foot of filter face area and shall contain not less than 15 pleats per linear foot.

Magnahelic Gauge: A differential pre ssure gauge for measuring the pre ssure drop acro ss each filter bank shall be installed. The gauge shall be diaphragm actuated dial type 4" / 4" OD, with white dial, black figures and graduations and pointer zero adjustment.. Gauges shall be factory installed. DAMPERS

Galvanized Low Leak Dampers: Blad es shall be parallel blade types, in e ither horizontal or vertical arrangement as req uired when blending two adjacent damper airstreams. Al l other dam pers shall be opposed blade types. The frame shall be fabricated from 16 gage galvanized steel formed “C” channel. Side framing shall have extruded bearing holes to decrease wear and allow smooth rotation of the blade shaft bearing. Blade end seals shall be spring type tempered stainless steel. Damper linkage shall be concealed in the frame out of the airstream for re duced air turbulence. The linkage shall ride on self-lubricated Delrin type be arings contained within the quadrant clamp. Provid e all lin kage required to position and lock damper. Blades shall be fabricated from no less than 16 gage galvanized steel. Blades shall utilize the triple V groove design and be furnished with a low leak blade edge seal. Drive shafts shall be square to ensure proper alignment and positive locking connection between the blade, axle and linkage. Ro und drive shafts are unacceptable. Dampers shall be teste d by an inde pendent AMCA approved laboratory for leakage and air pressure drop in accordance with AMCA Standard 500. Testing reports shall be supplied with the submittal data. Leakage shall not exceed 4.6 CFM per square foot at 4" w.g. Pressure drop shall not exceed 0.15" w.g. at 1000 fpm. Damper blades shall be rated for a velocity of 1500 fpm without generating objectionable noise. Dampers shall be equal to Ruskin CD60. Acceptable manufacturers: Ruskin, Arrow and American Warming. ELECTRICAL POWER AND WIRING Unit manufacturer shall provide wiring from the motors to an external junction box. Dual motors shall be wired to a common junction box. PART 3 - EXECUTION START-UP

Installing Contractor’s service representative to perform the following:

Inspect field assembly of components and installation of central station air handling units including piping, duct work, and electrical connections.




Prepare a written report on findings and recommended corrective actions. Final Checks before Start-Up: Perform the following before start-up:

Verify that shipping, blocking, and bracing are removed.

Verify that unit is secure on mountings and supporting devices and that connections for piping, duct work, and electrical are complete. Verify that proper thermal overload protection is installed in motors, starters, and disconnects.

Perform cleaning and adjusting specified in the Section.

Disconnect fan drive from motor, verify proper motor rotation direction and verify free fan wheel rotation and smooth bearing operations. Reconnect fan drive system, align belts, and install belt guards.

Lubricate bearings, pulleys, belts, and other moving parts with factory recommended lubricants.

Set zone dampers to fully open position for each zone.

Set face and bypass dampers to full face flow.

Set outside air and return air mixing dampers to minimum outside air setting.

Comb coil fins for parallel orientation.

Install clean filters.

Verify that manual and automatic volume control, and fire and smoke dampers in connected duct work systems, are in fully open position. Starting procedures for central station air handling units include the following:

Energize motor; verify proper operation of motor, drive system, and fan wheel. Adjust fan to indicted rpm.

Replace fan and motor pulleys as required to achieve design conditions.

Measure and record motor electrical values for voltage and amperage.

Manually operate dampers from fully closed to fully open position and record fan performance.

Refer to Division 15 Section “Testing, Adjusting, and Balancing” for air handling system testing, adjusting, and balancing. Operation and Maintenance Manuals: Manual shall be provided complete with descriptive literature, model, and serial number of all equipment, performance data, manufacturer’s instructions for operating and maintenance and lubrication recommendation and schedule. DEMONSTRATION Engage the services of a factory authorized service representative to trai n Owner’s maintenance personnel on procedures and schedules related to start-up and shut-down, troubleshooting, servicing, and preventative maintenance. Review data in the operation and maintenance manuals. Refer to Division 1 Section “Contact Closeout”. Schedule training with Owner, through Architect, with at least a 7-day advance notice. END OF SECTION 15850
