J_432 GSC GC _ ADDENDUM 2.pdf

J-432 GORDON STATE COLLEGE

CAMUPSWIDE HVAC AND ELECTRICAL SYSTEMS RENEWAL

NBP #24075

ADDENDUM NO. 2

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This Addendum forms part of the Contract Documents and modifies the original Construction Documents dated June 12, 2025. The contract documents are herein amended under the date of July 15, 2025 as follows:

Responses to Questions

1) Will there be another opportunity to review the site before bids are due?

1a) There will be an additional MANDITORY site scheduled for Tuesday July 22, 2025 at

9AM – contractors to meet at the facility office to sign-in.

Note: Bid date has been extended to July 30th at 2 PM.

2) Are there pneumatic controls on campus?

2a) While there are pneumatic controls on campus, none of the buildings in this scope of work have working pneumatic controls.

3) How many and what are the current controls front end?

3a) All the existing controls are under Metasys.

4) Is it expected that a mechanical contractor be the prime? And/or is a GC license required?

4a) No, a Mechanical Contractor cannot be the prime since the services scope is not only mechanical.

Yes, a State of Georgia GC license is required.

5) The index of drawings list the following drawings incorrectly: SCM402, SCM403, SCM404, and SCM405. The drawings themselves are correct.

5a) Noted, this has been corrected.

6) In the Instructional Complex there is a note to demo (ICM100) the actuators to the smoke-control dampers and on the new work (ICM200) it mentions replacing the dampers and actuators.

Please advise if the dampers are remove and replace or just the actuators. If the dampers are to be replaced please provide information on the new dampers.

6a) The entire assembly, including damper and actuator, will be replaced. Size and quantity of dampers are to match existing dampers. Replace with specified model in specifications.

7) The Instructional Complex demo sheet shows removing the fan coil units on the 2nd and 4th floors and on the new work sheet you show replacing FCU-1 and FCU-2 on the second floor only.

Is this correct and if so, do we need to permanently cap the water lines going to the additional FCU's that are being removed? These are also not listed on the schedule or in the specifications, please provide this information 7a) FCU-1 and 2 will not be replaced as part of this project, and have been removed from the drawings.

8) In the Instructional Complex you show removing and replacing the fume hood velocity monitor on the 3rd and 4th floors. I need fume hood information and information on the new velocity monitor.

8a) Contractor to verify existing fume hood model. New fume hood velocity monitor specified in specification section 233512.

NBP #24075

ADDENDUM NO. 2

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9) The Instructional Complex notes removing and replacing the flue to the boilers from the basement through the roof as part of the deductive alternate. We need additional information on the chase and roof. The Flue does not show in the chase or where it penetrates the roof. I need to know the chase wall types and finishes in case we are required to cut into them for replacement. I also need roof information, type, bond etc.

9a) Provide three separate 10” flue runouts through the chase and up to individual roof caps.

Boiler manufacturer to confirm flue dimensions prior to purchase. It is not anticipated that the chase will require altering. Roof information will be available after the contract is awarded.

10) In the Student Center please provide pipe sizes on the coils for AHU-2.

10a) Shown now on SCM402, SCM001, and SCM301. Both heating and chilled water coils to be 2” diameter.

11) In all three building please provide pipe sizes on all of the terminal units. This is not show on the schedules.

11a) Pipe size column added to schedules.

12) Can you please provide reflected ceilings drawings for all three buildings?

12a) For pricing assume all ceilings are lay in grid type.

13) Can you please give me wall types and finishes for the chases in the Instructional Building (ICM201 column line 5-C) and Student Center (SCM102A, SCM102a, and SCM202A) 13a) All chases are gypboard.

14) Drawings: ICM001, Max face velocity for cooling coils 560 FPM. Specification: 23 7313- 2.6.G.5, Max face velocity for cooling coils 500 FPM. The face velocity of these coils will have water carryover.

14a) Schedules have been revised to require 500 fpm max.

15) Sheet ICE100 note 3 requests 3 new 100A 3 pole breakers for the new VFD's to the fan arrays. SWBD does not appear to have 3 openings to support this request and it doesn't appear we will be opening any of this up during the demo. Please advise either verification of the openings to support or an alternative solution.

15a) For pricing assume a new 400A breaker can be added to the existing switchboard.

Route this 400A feeder, using 3#600 kcmil CU, 1#4G into the air handling room and tap the feeder with three 100A fused disconnects to serve the individual VFD circuits.

16) IC, Russell and Student Center accessibility – Will portions of the buildings be generally available to work in without occupants? Will afterhours work be required?

16a) All work is anticipated to be completed during normal business hours in unoccupied spaces. After work hours may be coordinated with GSU staff during construction, as dictated by agreed phasing schedule.

17)Bids are required to show the address and Room number shown in the Invitation to Bid - What is that address & Room number?

17a) Building 5, Facilities

18) Please clarify areas that require ceiling tile only replacement?

18a) Inside the dashed line noted and shown on SCA102A.

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19) What are the expected working hours and working day?

19a) GSC Facilities will be open/available from 6 am to 5 pm, Monday-Friday.

20) Where can we set up parking, storage and laydown yard?

20a) This will be determined after the contract has been awarded.

21) In the "Bid Requirements Invitation to Bid documents, reference is made to "In judging whether the bidder is responsible, the Owner will consider, but is not limited to the following:

Whether the bidder can demonstrate a commitment to safety with regard to Workers' Compensation by having an Experience Modification Rate (EMR) over the past three years not having exceeded an average of 1.2; and whether the bidders past work provides evidence of than ability to successfully complete the public works projects with the established time, quality , or cost, or to comply with the bidders contract obligations. - Are we expected to provide this information with our bid submittal, or will this documentation be asked for at a later date?

21a) This documentation will be required before a contract is signed. The owner has the right to disqualify bidders who cannot provide this qualification proof.

22) Specification Section 230923 2.1 list (4) Specific Controls Companies. Please confirm that these are the only allowable bidders for Controls.

22a) Distech by Hoffman Building Technologies and by CMS controls, Delta by CCI, and KMC by ESS are the only 4 allowed. All are already included in the specifications. HBT is the layout basis.

23) Will the Mechanical Contractor be required to specify which control company they intend to use so that the Owner will know which company they are getting?

23a) So long as it is one of the four approved controls companies there is no reason to include that information in the bids.

24) It was mentioned, at the pre-bid meeting, that there had been controls issues and sequencing concerns. Would controls company selection and/or preference be considered as part of award consideration.

24a) There is no preference in any of the four allowable control companies.

25) Specification section 230923 1.4.A - Appears to indicate that the existing Controls Front End (Graphical User Interface) is an existing Niagara (N4) system - Campus Wide. Is this what is existing or what is desired for the future?

25a) This is desired for the future.

26) Please confirm Front End system, current version and Licensing information.

26a) Existing system is Johnson Metasys. Version will be made known after contract is signed.

27) Will the Owner be providing the front end server/VM that will reside on the Owner's network or will the Controls Contractor be providing the server.

27a) Contractor to provide.

28) Will the Owner allow remote access, now or in the future, via VPN or other Owner network access?

28a) GSC will allow for remote access.

29) Specification Section 230923 3.6 indicates commissioning by a commissioning authority. Will this be an Owner contracted 3rd party agency or Contractor provided commissioning ?

29a) GSC will contract with a Cx agent directly.

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30) Regarding Alternate M1 - Russell Hall Building –

Please confirm intent to replace existing controls on "equipment to remain" with new controls or to leave existing JCI devices. In the base bid, the entire Russell building, both new and existing to remain devices will be transitioned to the new Niagara control system.

Please clarify if the intent is to provide new controls on existing equipment and tie into existing JCI system or leave existing equipment that remains with existing JCI controls and to remain on existing JCI front end. If alternate M1 is taken, existing devices will remain on the JCI system, and new devices will be added to the JCI system.

If this is to be new controls on existing JCI, then JCI will need to provide the graphics.

Who is responsible for providing updates to existing JCI front end? If Alternate M1 is taken, the contractor will be required to work with JCI to integrate the new devices into the existing JCI system.

Please confirm that base bid includes replacing existing equipment with controls and tying into Niagara N4 front end. That is correct – all existing HVAC devices that remain will be transitioned to the new Niagara system as part of the base bid.

31) Who is the existing fire alarm manufacturer on site?

31a) Notifier.

32) Is there any information about the existing switchboard? Brand? Model?

32a) It varies, but most appear to be Square D.

33) Are all the VAVs in ACT ceilings?

33a) For pricing assume this is the case.

34) If taken, would Alternate E-5 include the Bookstore Track/Display/Overhead lighting?

34a) If alternate E4 is taken, only the ring lights in the bookstore will be replaced. If E5 is also taken, no new lighting will be replaced in the bookstore.

35) Can you clarify what accessories we would be replacing in regard to Note 15 on ICM100?

35a) Deductive alternate to address any equipment, piping, valves, thermometers, circuit setters, and any other devices on the loop in the indicated area.

36) Can you provide more details on the configuration of the valve kits for the VAVs?

36a) Refer to the 2-way or 3-way piping details at TU heating coils for information.

37) Since all ductwork for the building does seem to be existing to remain, is there a desire or interest to include duct cleaning for the existing to remain ductwork in this project?

37a) No additional duct cleaning for existing ductwork is anticipated at this time.

38) What is the scope of the Test and Balance required for the project? Only newly added items, or should it include existing HVAC devices where new controls have been added?

38a) Only new devices (AHU, boilers, pumps, VAVs, etc) require Test and Balancing. Existing to remain devices that have only new control interfacing will not require testing or balancing.

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AMENDMENTS TO THE SPECIFICATIONS

1. Replace SECTION 23 0510-GENERAL MECHANICAL REQUIREMENTS with attached

2. Replace SECTION 23 0519-METERS AND GAGES FOR HVAC PIPING with attached

3. Replace SECTION 23 0548-VIBRATION AND SEISMIC CONTROLS FOR HVAC

PIPING AND EQUIPMENT with attached

4. Remove SECTION 23 0533-Heat Tracing for HVAC Piping in its entirety

5. Replace SECTION 23 0553-IDENTIFICATION FOR HVAC PIPING AND EQUIPMENT with attached

6. Replace SECTION 23 0593- TESTING, ADJUSTING AND BALANCING FOR HVAC with attached

7. Replace SECTION 23 0719-HVAC PIPING INSULATION with attached

8. Replace SECTION 23 0994-HVAC SEQUENCE OF OPERATION with attached

9. Replace SECTION 23 2113- HYDRONIC PIPING with attached

10. Replace SECTION 23 2114- HYDRONIC SPECIALTIES with attached

11. Replace SECTION 23 2123-HYDRONIC PUMPS with attached

12. Add 23 3512-LABORATORY AIR FLOW CONTROL SYSTEM

13. Replace SECTION 23 3600- AIR TERMINAL UNITS with attached

14. Replace SECTION 23 4000- HVAC AIR CLEANING DEVICES with attached

15. Replace SECTION 23 5216-CONDENSING HEATING BOILERS with attached

16. Replace SECTION 23 7313- CENTRAL-STATION AIR-HANDLING UNITS with attached

17. Replace SECTION 23 7323-CUBE FAN ARRAY with attached

18. Add SECTION 23 8216-AIR COILS

NBP #24075

ADDENDUM NO. 2

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DRAWING SHEETLIST

END OF ADDENDUM NO. 2

J-432 GORDON STATE COLLEGE JULY 14, 2025

CAMPUSWIDE HVAC AND ELECTRICAL SYSTEMS RENEWAL CONSTRUCTION DOCUMENTS

NBP#24075

GENERAL MECHANICAL REQUIREMENTS 23 0510 - 1

SECTION 23 0510 - GENERAL MECHANICAL REQUIREMENTS

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Definitions.

B. Quality Assurance Requirements and Installer Qualifications.

C. General Product Delivery and Storage.

D. Installer Warranty.

E. Submittal Procedures Supplementing Section 01 3000.

F. Mechanical Shop Drawing Requirements.

G. Operating and Maintenance Manuals.

H. Execution Requirements common to Division 23 systems.

I. HVAC Demolition.

J. Existing HVAC systems.

K. Existing HVAC Equipment.

L. Pipe Sleeves within building.

M. Pipe Sleeves in footings and foundations.

N. Space Conditioning during Construction.

O. Piping Pressure Tests.

P. Equipment Bases and Housekeeping Pads.

Q. Equipment backboards.

R. Starting equipment and Systems-General Requirements.

S. Training Requirements.

T. Cleaning Requirements.

U. Finishing Requirements.

1.2 RELATED SECTIONS

A. Section 01 3300 - Submittal Procedures, for submittal procedures.

B. Section 01 7000 - Execution Requirements, for additional submittal and warranty requirements.

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C. Section 03 3000 - Cast-in-Place Concrete.

D. Section 07 8413 - Penetration Firestopping.

E. Section 07 9200 - Joint Sealants.

F. Section 09900 - Painting and Coatings.

1.3 DEFINITIONS

A. Manufacturer's Representatives: Wherever MANUFACTURER'S REPRESENTATIVE is referred to in this division, said representative shall be regularly employed by the manufacturer to perform similar activities to those called for herein, which indicates his competence in that field of work.

B. Concealed: Where the word concealed is used in this Division, it shall mean items above ceilings, in attics, in crawl spaces, in chases, in tunnels, in cabinet work, and under counters or equipment so as to be not visible from an elevation of 5 feet at a horizontal distance of 10 feet.

C. Finished Spaces or Areas: Where finished spaces or areas are referred to in this Division, it shall mean all spaces except concealed spaces, mechanical rooms, or boiler rooms unless otherwise noted.

D. Provide: Furnish and install.

E. Control and Interlock Wiring: All wiring, both line voltage and low voltage, other than power wiring from an electrical distribution panel, through the primary control device, to the item of equipment.

F. Primary Control Device: That ONE device for any item of equipment which interrupts power flow during normal operation. Where magnetic starters are provided, they are the primary control. For items not switches by starters, the primary control device will be that ONE thermostat, time clock, manual switch, aquastat, P.E. switch, or relay performing the primary switching.

G. Diagrammatic: A drawing that shows arrangement and relations (as of parts).i.e.: A diagrammatic drawing uses symbols rather than pictorial representation of pipes, ducts, conduit and other items shown and is not necessarily to scale. Arrangement, location, and sizes shown are firm.

H. Readily Accessible: Items requiring maintenance shall be available for close approach for maintenance or use in a space, through an access door from floor elevation, or above a lay-in ceiling though an access point by maintenance staff safely standing on a ladder no taller than the ceiling.

I. Noted, Indicated or Shown: Where the terms "Noted", "Indicated" or "Shown" are used in these specifications, the words "in the specifications or on the plans" shall be inferred.

J. Detail: Where reference is made to a Detail, the Detail shall be on the plans unless otherwise noted.

GENERAL MECHANICAL REQUIREMENTS 23 0510 - 3

K. Specifications: Where reference is made to these specifications, it shall be inferred in this Division of specifications.

L. Notification by the Contractor, and Instructions to the Contractor: Where reference is made in these specifications to notification by or instructions given to the Contractor, it shall be inferred that the Design Professional shall be the instructor or shall be notified, as the case exists.

M. Division or Section Reference: Where reference is made to another Division or Section within this Division, refer to specifications table of contents for Division, Section, or Page Number.

N. Flow Diagram: A single-line, two-dimension, non-scaled drawing depicting arrangement and sequence of equipment, valves, controls, thermometers, gauges, and other specialty devices in a pipe or duct system.

1.4 REGULATORY REQUIREMENTS

A. Where requirements of these specifications exceed specified codes and ordinances, conform to these specifications.

B. Materials and equipment included in Underwriters Label Service shall bear that label. Electrical equipment shall be U.L. approved as installed.

C. Permits and Codes: Refer to the General Conditions.

D. Fire Prevention Precautions in Cutting and Welding Areas: Conform to Article 2605 Fire Prevention Precautions, Georgia State Minimum Standard Fire Prevention Code (International Fire Code), 2018 Edition, with all Georgia State Amendments, for all work involving cutting and welding.

E. HVAC: Conform to the Georgia State Minimum Standard Mechanical Code, International Mechanical Code, 2018 Edition with 2020 and 2024 Georgia State Amendments.

F. Gas: Conform to the Georgia State Minimum Standard Gas Code (International Fuel Gas Code), 2018 Edition, with all Georgia State Amendments.

G. Energy: Conform to the Georgia State Energy Code for Buildings, International Energy Conservation Code, 2015 Edition, with 2020, 2022, 2023 Georgia State Amendments.

H. All Work: Conform to State of Georgia Chapter 120-3-3 "Rules of Safety Fire Commissioner, Rules and Regulations, January 1, 2020", and ADA.

I. Electrical: Refer to Division 26. Conform to the National Electrical Code, NFPA 70, 2023 Edition.

J. Building Code: Conform to the Georgia State Minimum Standard Building Code, International Building Code, 2018 Edition with 2020, 2022, 2024, and 2025 Georgia State Amendments.

GENERAL MECHANICAL REQUIREMENTS 23 0510 - 4

1.5 VALUE ENGINEERING

A. Where the Contractor is requested to offer or make Value Engineering suggestions as a means of reducing the Project Cost, the Contractor shall present suggestion in the format prescribed herein.

B. Provide each suggestion in writing referencing the specific element involved, i.e. specification article and/or drawing/detail number(s).

C. State how the proposed change impacts the project, i.e. change in life expectancy, increased operating costs, etc. in addition to the reduction of first cost (Amount of cost reduction.).

D. State how the change will impact the Construction Schedule.

E. Where the change impacts the contract drawing(s), provide a sketch of the proposed change to assist in the evaluation process. If the suggestion is approved, the Contractor shall provide a drawing, as a part of the shop drawing process, showing the Contractor's proposed changes.

F. Each suggestion shall include specific language commenting that the proposed change has been or has not been successfully made previously one or more similar projects.

1.6 SUBMITTALS

A. Supplementing Division 1 Administrative Requirements; the Contractor shall:

1. Identify all submittals by a cover sheet showing project name, specification section, drawing or detail number, room number, date, revision date, contractor and subcontractor's organization and project manager with phone number, the model, style and size of item being submitted with manufacturers' representative, salesman (or a preparer who can answer questions), and Preparer's phone number.

2. Prepare a master list of submittal proposed to be submitted on the project. This list shall be updated for each submission and shall be the first sheet(s) of the submission in the quantity that is submitted for review. The information and general format of the master list shall contain a Specification Section, Section Title, Item Description, Item Status and any comment.

3. Review the submittal data and check to ensure compliance with specifications prior to submitting. Contractor shall document compliance using specification as a checklist and note line-by-line Comply "C" or Deviate "D".

a. The Contractor agrees that submittals of equipment and material and shop drawings of equipment and material layouts required under provisions of these specifications and processed by the Design Professional are not Change Orders. The purpose of submittals is to demonstrate that the Contractor understands the design concept of the project by indicating the equipment and materials he intends to furnish and install, and by detailing the installation he intends to achieve.

b. The Contractor shall conform to the requirements of the Contract Documents unless a change order is issued. The Contractor shall identify on each submittal that the

GENERAL MECHANICAL REQUIREMENTS 23 0510 - 5

submittal contains no deviations or the Contractor shall identify any proposed deviations.

c. Any submittal or shop drawing not conforming to the Contract Documents without this identification and notification shall be assumed to be marked "Revise and Resubmit" ( the contractor acknowledges this by the submission), and the Contractor shall promptly resubmit said submittal so as to be in full compliance with the Contract Documents.

d. Failure of the Contractor to provide this information during the shop drawing phase shall make the Contractor responsible for all changes to achieve compliance with the Contract Documents without additional compensation.

4. Provide a Letter from the HVAC Contractor stating that they have checked all submittals for compliance with specifications.

5. Product Data:

a. Provide data specific to the product proposed indicating capacity data, all standard and optional features to be supplied and all accessories and options available for that product.

b. Manufacturers' standard drawings shall be modified by deletions or additions to show only items applicable to this project.

B. Deliver submittals to the Design Professional at the business address.

C. Digital Delivery of Submittals:

1. Submittal data may be posted to the NBP Engineers FTP site when agreed upon by the Design Professional and the Owner during the preconstruction phase. The Contractor will be provided with a project folder and a password.

2. Prepare the submittals as described above. Take steps to reduce submittal file size.

3. Do not scan in color or high resolution unless required for clarity.

4. Optimize any scans to help control file size.

5. Ensure any reproductions are legible.

6. Organize Submittal files individually by specification section with file name format as Follows; "CSISection# - Section Title - any further identifier required such as control drawings"

7. Send an email to submittal@nbpengineers.com with a copy to the HVAC Design Professional and any Architectural Design Professional (if applicable) identified during the preconstruction phase.

8. Identify the submittal using the official project title, specification section and submitted item. i.e. Project No. G-xxx, Addition to Administrative Building-Section 230548-Vibration

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and Seismic Controls. Include drawing or detail number, room number, date, revision date(s), contractor and subcontractor's organization as applicable

9. Include the project manager's and manufacturers' representatives, salesman's (or a preparer who can answer questions) contact information, email and phone number.

10. Identify the submittal in the email subject line using the same information listed above.

11. Provide a submittal index.

12. Ensure any submittal posted to NBP's or other FTP site has the same identification.

13. NBP Design Professionals will not process or react to submittals which are not properly transmitted, indexed, and identified.

D. Shop Drawings:

1. General: Furnish shop drawings of each of the following systems:

a. Ductwork

b. HVAC and Plumbing Piping

c. Equipment Rooms

1) HVAC Equipment, Ductwork, and Piping

2. Format and Content:

a. Shop drawings shall be complete and shall accurately show all items of equipment and material. The number of drawings, and the views contained therein, shall be as needed to show the actual and final routing, construction, and final assembly of each system.

b. All drawings shall be electronically produced in a BIM compatible format. Free-hand drawings are not acceptable.

c. All lettering shall be legible without use or aid of magnifying device. Title-block lettering shall be minimum 1/8".

d. Drawings shall be printed (or plotted) at either 24" high by 36" wide, or the same size as the Contract Drawings for the same trade, whichever is greater. Each drawing sheet shall be formatted the same as the Contract documents (i.e., border width, title block, etc.). With the exception of Isometric drawings, all other drawings shall be drawn in two-dimension and at the same scale as the Contract Drawing of the same area, or as follows, whichever is the larger scale:

e. Scale of drawings shall be as follows:

1) Floor Plans 1/8" per foot

2) Roof Plans 1/8" per foot

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3) Elevations 1/4" per foot

4) Details 1/4" per foot

5) Equipment Room Layouts 1/4" per foot

6) Isometrics No scale

7) Riser Diagrams 1/4" per foot

8) Equipment Room Pad Layout 1/4" per foot

f. Three-dimensional views may be produced and used to provide supplemental information to that which is given on two dimensional drawings. Three-dimensional drawings shall be drawn from a 30-deg. perspective.

g. For HVAC equipment rooms and mechanical rooms, Three-dimensional views shall be produced and used to provide supplemental information to that which is given on two dimensional drawings. Three-dimensional drawings shall be drawn from a 30-deg. perspective. For remaining spaces, Three-dimensional views may be produced and used to provide supplemental information to that which is given on two dimensional drawings. Three-dimensional drawings shall be drawn from a 30-deg.

perspective.

h. Each individual shop drawing sheet shall contain a single format (two-dimensional or three-dimensional).

i. In addition to the information called for in the Contract Documents provide all additional data and notations needed to show conformance with Contract Documents (i.e., air flow and volume from/to air devices).

j. For all drawings drawn in two-dimensions, all characteristics of the equipment, systems and components, shall be drawn to scale to designate actual size. Use of dimensions alone to designate width, height, length, or depth is not acceptable. Drawings shall not require that they be "scale" to determine sizes or location.

k. In the event either the project as a whole, or the specific area covered by a particular drawing, does not contain columns, floors and/or walls to which dimension reference can be made in the location of items, alternate fixed points of reference may be used.

l. Shop Drawings drawn at the same scale as the contract Drawings, shall incorporate the same floor plan or ceiling plan areas, and shall be arranged and be "broken" along the same lines as the Contract Drawings.

m. Duct and piping systems which have the following maximum width on one side shall be drawn in the following manner:

1) Drawing Scale

GENERAL MECHANICAL REQUIREMENTS 23 0510 - 8

2) 1/4" per ft. =>4" Double-line

3) 1/4" per ft. <4" Single-line

4) Flexible Duct Single-line to diffusers

3. Ductwork Shop Drawings:

a. Background information shall be redrawn scaled versions of the Architectural floor or Reflected Ceiling Plans of the Contract Drawings and shall show all partitions, openings, and structural features. Drawings from the Contract Documents shall not be copied for use as backgrounds nor will reproducible drawings be made available from the Architect for this purpose.

b. Show fitting joints, fittings, equipment, required maintenance, removal and safe working clearances, elevations, location and sizes of access panels, net sizes (size of system less insulation), dimension from finished floor and/or overhead structure, horizontal dimension from centerline of columns, direction of flow, changes in size, changes in external covering, system material, construction classification, system name, internal liner, unique situations, equipment designation.

c. Show floor plan location of all space control and sensing devices (thermostat, humidistats, CO2 sensors etc.) complete with the designation of the piece of equipment or component which device controls. Lines drawn between the sensing device to the controlled equipment or component, to designate their interaction, are not acceptable.

d. Sheet metal work shall be drawn using symbols and designations in accordance to the latest edition of "SMACNA" Duct Construction Standards - Metal and Flexible".

4. Piping Shop Drawings:

a. Background shall be the Ductwork Shop Drawings called for elsewhere in this Section except that notes and details pertinent to only ductwork may be omitted.

b. Show flanges, fittings, equipment, locations and sizes of access panels, required maintenance, removal and safe working clearances, elevations, net size (size of system less thermal or acoustical coverings), dimension from finished floor and/or overhead structure, horizontal dimension from centerline of columns, grade, percent of slope and/or rate of change, direction of flow, changes in size, changes in external covering, system material, construction classification, system name or symbol, unique situations, equipment designation.

c. Show floor plan location of all space control and sensing devices (thermostats, humidistats, CO2 sensors) complete with the designation of the piece of equipment or component which device controls. Lines drawn between the sensing device to the controlled equipment or component, to designate their interaction, are not acceptable.

d. Piping shall be drawn utilizing the symbols and designations of the controls standards, providing those standards are in general compliance with Industry

GENERAL MECHANICAL REQUIREMENTS 23 0510 - 9

Standards (i.e. ASHRAE, ANSI, etc.). Provide piping symbol legend on shop drawing.

e. Each piece of equipment or manufactured product shall bear the same designation as indicated on the contract documents.

5. Equipment Room Shop Drawings:

a. Background shall be redrawn scaled versions of the Architectural Floor Plan showing all partitions, openings, and structural features.

b. Show actual size and location of equipment in both plan and vertical section, laid out on center line of equipment shown.

c. Equipment and equipment pads shall be drawn to scale and dimensioned. Dimensions shall conform to actual manufacturer's dimensions for product used.

d. Show dimensions of equipment placing relative to partitions, columns, beams, and underside of structural deck.

e. Show and dimension all service clearances, access door swings, vertical clearances.

f. Show all piping, ducts, and equipment to provide full information for coordination.

g. Show electrical panels to scale including control panels and disconnect switches.

E. Tabulation of Power Wiring Requirements: Within 60 Days of the Notice to Proceed, provide a Tabulation of Power Wiring Requirements of all proposed equipment, including H.P., amps, voltage, phase and KW, tabulated on a separate sheet. A copy of the tabulation shall be transmitted independently to the Contractor, the Design Professional and to all affected trades.

(Refer to Electrical Drawings for electrical provisions for equipment.)

F. Piping Pressure Tests - Submit the following:

1. Hydrostatic Testing Records: The Construction Manager shall maintain an updated log of pressure tests available to the Owner and Design Professional at all times. The Construction Manager shall submit a final log to the Owner for record.

2. Submit affidavit of pressure test compliance to the Owner and Design Professional.

G. Warranty: Submit the HVAC installer's warranty letter addressed to the Owner stating the correct project name and number, if applicable, the warranty period and ensure that form has the correct date of the Material Completion.

1.7 OPERATING AND MAINTENANCE MANUALS

A. Operating and Maintenance Manuals shall be prepared by the Contractor for all equipment and be submitted for review a minimum of two months prior to the request for Material Completion.

B. Digital delivery of Operating and Maintenance Manuals:

GENERAL MECHANICAL REQUIREMENTS 23 0510 - 10

1. Operating and Maintenance Manuals may be delivered digitally and posted to the NBP Engineers FTP site when agreed upon by the Design Professional and the Owner during the preconstruction phase. The Contractor will be provided with a project folder and password.

2. Prepare the Operating and Maintenance Manuals as described above. Take steps to reduce submittal file size.

3. Do not scan in color or high resolution unless required for clarity.

4. Ensure any reproductions are legible.

5. Send an email to submittal@nbpengineers.com with a copy to the HVAC Design Professional and the Architectural Design Professional (if applicable) identified during the preconstruction phase.

6. Identify the manuals in the email subject line using the official project title, specification section and submitted item. I.E. Project No. G-xxx, Addition to Administrative Building.

7. Table of Contents(Index) sheets shall be included in the order listed with identifications typed in capital letters.

8. Ensure the manuals posted to the FTP site has the same identification.

9. NBP Design Professionals will not process or react to manuals which are not properly transmitted, indexed, and identified.

C. Each Manual shall contain the following information, data and drawings:

1. Copies of submittals (with Design Professional's review comments and stamp), equipment and materials.

2. Manufacturer's installation, operating and maintenance instructions for each item of equipment with moving parts including recommended frequency of inspections and maintenance for one year of facility operation.

3. Manufacturer's list of renewal parts for each item of equipment with recommended stock items and quantities indicated.

4. Control diagrams, electrical interlock diagrams, and control valve lists.

5. Copies of as-built shop drawings showing layouts and construction details.

6. Copies of Test and Balance Reports including list of instruments and description of methods employed.

1.8 QUALITY ASSURANCE

A. HVAC Installer Qualifications:

1. Wherever the word "company" or "firm" is used in these subparagraphs, it shall mean the contractor/subcontractor of record for the installations used for proficiency qualification.

GENERAL MECHANICAL REQUIREMENTS 23 0510 - 11

2. Refer to the individual sections within this division for additional installer qualification requirements.

3. The Contractor expressly warrants that the company performing the installation of the air conditioning systems has demonstrated proficiency in the installation, start-up and adjustment of such systems by the successful performance of work of the nature specified herein on at least three commercial or institutional buildings, each containing minimum of 30 tons capacity or greater, field erected apparatus air handlers 20,000CFM or greater, ducted air distribution and chilled water, PTAC or wall hung units excluded.

4. The Contractor further warrants that the aforesaid subcontractor, if any, has trained personnel, instruments, tools, and equipment to perform the installation, start-up, instruction and maintenance service specified.

5. The Contractor also warrants that the aforesaid installer, if any, has been in business performing services of the nature specified herein for at least five years.

1.9 PRODUCT DELIVERY, STORAGE, AND PROTECTION

A. Accept all products on site in factory-fabricated protective containers. Inspect for damage.

B. Store products in a clean dry place and protect from weather and construction traffic.

C. Handle products carefully to avoid damage to components, enclosures, and finish.

D. After placement, protect products from damage during construction, by all trade contractors.

E. Protect equipment nameplates and labels from damage, being painted, scaring, etc.

1.10 WARRANTY

A. Refer to Section 01 7000 - Contract Closeout, for additional warranty requirements.

B. Submit manufacturers' warranties prior to final inspection. Refer to the General Conditions.

C. Correct any defective Work within a one year period after Date of Material Completion. Provide HVAC Installer's warranty letter dated the date of the Material Completion

D. Where warranties beyond the Contractor's one (1) year warranty are specified, the additional warranty time shall start on the same date as the Contractor's warranty.

PART 2 PRODUCTS-NOT USED

PART 3 EXECUTION

3.1 EXAMINATION

A. Refer to the specifications and Architectural and Structural drawings for additional requirements pertaining to work under this discipline. Notify the Design Professional for clarification in the event of conflict.

GENERAL MECHANICAL REQUIREMENTS 23 0510 - 12

B. All materials of systems installation exposed in hollow spaces that are used as ducts or plenums shall have a flame spread rating of 25 or less and a smoke development rating of 50 or less.

3.2 PREPARATION

A. Drawings are diagrammatic and show the general proximity of the equipment, ducts, and pipes, etc., are not to be scaled, and do not include all required changes in direction or offsets necessary in coordinating the installation of various materials either between trades or within the same trade. All dimensions shall be verified at the building site. Prefabrication and/or installation of work from drawings shall be at the Contractor's risk. Refer to Architectural plans for exact building dimensions and details.

B. Space Conditions:

1. All apparatus shall fit into the available spaces in the building and must be introduced into the building so as not to cause damage to the structure. Equipment larger than access to equipment spaces shall be disassembled into sub-assemblies for installation.

2. Where deviations from the plans are required in order to conform to the space limitations, such changes shall be made at no additional cost to the Owner and shall be subject to approval.

3. All equipment requiring service shall be made accessible. Coordinate piping and ductwork installation to avoid conflict with other trades.

3.3 HVAC DEMOLITION

A. The HVAC demolition plans have been prepared to assist the Contractor in determining the scope of demolition work and should not be construed to be all of the demolition required. the Contractor shall visit job site (after carefully reviewing the contract documents) and determine exact areas and quantities of existing materials to be removed to accomplish new construction.

B. All existing material removed from the facility shall be the property of the Contractor, unless otherwise noted, and shall be removed from the facility as required by the Contract provisions concerning trash removal.

C. All existing equipment removed from the facility shall be the property of the Contractor, unless otherwise noted, and shall be removed from the facility as required by the Contract provisions concerning trash removal.

D. Material and equipment which has been removed shall not be used in the new work, except as noted.

E. Where the Documents indicate an equipment item to be removed. Remove all associated material including hangers, supports, wiring, controls conduit, etc. Do not leave abandoned items.

F. Dispose of any material to be discarded in accordance with all laws and regulations.

GENERAL MECHANICAL REQUIREMENTS 23 0510 - 13

3.4 EXISTING HVAC SYSTEMS

A. The existing mechanical equipment and systems shall remain "as-is" except as otherwise indicated or specified. Perform all work necessary to properly tie in new work with existing conditions and to adapt existing conditions to conform to the changes in the building and systems.

B. Remove exposed and accessible piping, ductwork, and other materials rendered useless due to changes or modifications. Cap outlets in piping. Blank-off or patch openings in ductwork and duct insulation. Repair insulation damaged during construction.

C. Remove concealed piping which is exposed by the removal of walls, partitions, etc., and reconnect and re-route as required to maintain system continuity.

D. Sleeves left open by removal of piping shall be cut flush with the finished slab or wall, filled with non-shrinking cement grout and/or fire rated foam flush with both sides of slab or wall to maintain slab or wall fire rating and finished to match the space finishes.

E. Openings left by removal of ductwork shall be patched matching existing construction.

F. Where existing piping, duct and/or equipment is shown on the Drawings to be reused, its identity, size, flow direction and location shall be verified prior to performing any work. Notify the Design Professional of any discrepancies.

3.5 EXISTING HVAC EQUIPMENT

A. This project makes extensive use of existing equipment.

B. The documents specify cleaning and other modifications to some of the existing equipment to be used in the modified system.

C. The documents specify the testing of this equipment recording the condition of the equipment.

D. The documents specify checking and documenting the control interlocks for the existing equipment and systems to be reused.

E. Include these activities in the overall construction schedule. Ensure that the schedule leaves time for any deficiencies to be identified and corrected before occupancy.

3.6 INSTALLATION

A. Indoor Air Quality Environment: Portions of the existing building will be in use and occupied during construction. The Contractor shall schedule work and provide temporary ventilation and/or isolation to insure that fumes from welding, other construction tasks, and out-gassing from construction materials do not migrate to occupied areas.

B. Clearance above and in front of electrical switchgear, electrical power panels or control panels shall be maintained by mechanical systems so that no mechanical ducts, pipes, vents or equipment is routed above or across the space directly above this equipment in conformance with the National Electrical Code.

GENERAL MECHANICAL REQUIREMENTS 23 0510 - 14

C. All equipment shall be installed in accordance with manufacturers' published installation instructions shipped with the equipment. In the event there is a discrepancy between these specifications or Drawings and the manufacturers' instructions, no work shall be performed until additional instructions are received.

D. Install and connect all appliances, equipment, and appurtenances as specified, indicated or required in accordance with the manufacturer's instructions and recommendations. Furnish and install complete auxiliary piping, water seals, valves, electric connections, and similar items, recommended by the manufacturer or as required for proper operation.

E. Equipment, valves and other items installed under this division requiring service shall be installed to be readily accessible. Refer to definitions in this section.

F. Coordinate with the Contractor and monitor the progress of the work so that other trades do not obstruct items requiring access for service.

G. Where new work is specified tying into old work and materials are different from existing, the contractor shall request a clarification from the Design Professional prior to performing the work.

H. After final balancing, equipment with belt drives shall have their belts operating in the mid-80% position of the adjustable sheave.

I. Provide equipment belt and coupling guards shielding the perimeter and face of all new belt drives, shafts and couplings. Provide openings opposite drive and driven shafts to permit use of revolution counter. Guards for fans shall be supported from the fan and mounting base, independent of the floor or housekeeping pad.

J. Route piping and ductwork to avoid skylights, translucent, and transparent ceilings.

K. Pipe Sleeves in Slabs, Masonry Walls and Partitions:

1. Provide sleeves in all slabs and walls/partitions unless otherwise noted.

2. Omit sleeves on cast iron pipe through slabs on grade.

3. Elevated Slabs: Schedule 40 black steel pipe: Sleeves shall be sized to include the insulation with minimum gap around insulation. Install, without developing a break in the pipe insulation, according to the fire sealant manufacturer's installation instructions for a U.L. Listed assembly for a rated pipe penetration through a slab.

4. Masonry Partitions: Schedule 40 black steel pipe: Sleeves shall be sized to include the insulation with minimum gap around insulation. Install, without developing a break in the pipe insulation, according to the fire sealant manufacturer's installation instructions for a U.L. Listed assembly for a rated pipe penetration through a rated masonry wall/partition.

5. Omit sleeves in openings core drilled in masonry partitions.

6. Rated Drywall Partitions: Twenty gage galvanized steel. Sleeves shall be sized to include the insulation with minimum gap around the insulation. Install, without developing a break in the pipe insulation, according to the fire sealant manufacturer's installation instructions

GENERAL MECHANICAL REQUIREMENTS 23 0510 - 15

for a U.L. Listed assembly for a rated pipe penetration through a rated drywall wall/partition.

7. Non-Rated Drywall Partitions: Omit sleeves.

L. Pipe sleeves in footings and foundation walls:

1. Schedule 40 black steel pipe.

2. Chilled water, heating water, condenser water, refrigerant, or process piping passing under a footing or through a foundation wall shall be installed in a pipe sleeve, two pipe sizes larger than the pipe passing through.

3. Sleeves in walls to spaces below grade shall be provided with 10 gauge leak plates.

M. Seal sleeves and openings in mechanical room walls, fire rated partitions, and floors above grade vaportight, watertight, or for smoke/fire protection as applicable. Refer to Section 07

N. Seal sleeves and openings in exterior walls vaportight or watertight as applicable. Refer to Section 07 9000.

O. Concrete Work: Refer to section 23 0548 for concrete bases and other supports required for HVAC equipment and systems. Coordinate with the Contractor.

P. Equipment and pipe support upper attachments shall be 3" x 3" x 1/4" steel angles, minimum, spanning structural members unless noted otherwise. Provide inserts and bolts for supporting pipes and equipment from structural members.

Q. Saw cut or core drill openings in existing work for the installation of the mechanical system.

Patching shall be performed by the trade whose work is cut. Contractor shall lay out and install his work ahead of the work of other trades wherever possible.

R. Continuity of Building Services:

1. Conform to staging as described under Division 01.

2. Sequence equipment installation and schedule work to ensure that systems of existing building(s) is(are) not interrupted when they are required for normal usage of the existing building(s).

3. Schedule work so existing building systems will not be interrupted when they are required for normal usage of the existing building.

4. Perform work to provide minimum inconvenience to the Owner and as approved by the Design Professional. No allowance will be made for lack of knowledge of existing conditions.

GENERAL MECHANICAL REQUIREMENTS 23 0510 - 16

3.7 SPACE CONDITIONING DURING CONSTRUCTION

A. Coordinate with the Contractor regarding the limits of space conditions specified or requested by other trade sections.

B. Assist the Contractor in the preparation of the construction schedule and determine to what extent the project's HVAC system can be operated within the restrictions listed below to help maintain those conditions.

C. Ducted air handling systems shall not be placed into operation for testing or for temporary space conditioning until all walls in areas served by the system have been prepared for painting and the building is broom clean.

D. The building's HVAC system shall be kept clean during the entire construction process. Protect equipment, motor, ducts, pipes from dirt and debris.

E. Filters during construction:

1. Provide and maintain filters on all air handling equipment and terminal units used for space conditioning during construction.

2. Provide and maintain filters on all return air grilles once ceilings are installed when air handling equipment or terminal units are used for space conditioning during construction.

3. Provide filters with a minimum MERV rating of 8.

F. Heating Terminal units such as unit heaters, cabinet heaters and finned radiation may be used for temporary heat during construction. Clean to new condition.

3.8 PIPING PRESSURE TESTS

A. General:

1. Provide 48 hours notification to the Design Professional in advance of any test.

2. Complete tests prior to insulating.

3. Leaks shall be repaired, defective materials replaced, and system shall be retested.

4. Strike all joints in copper and steel piping under a pressure test.

5. Conduct tests prior to connecting to equipment or isolate equipment from system.

6. No water pressure test shall be conducted in freezing weather where subject to freezing.

7. Test shall be maintained at conditions specified until approved but, in no event, for less than eight (8) hours minimum duration, unless otherwise noted.

8. Hydrostatic pressure tests shall…