121-091726JA.pdf

IFB # 121-091726JA

223.081

SCO #23-26928-01B

South Campus HVAC Upgrades Rowan-Cabarrus Community College

1531 Trinity Church Road Concord, NC 28027

INVITATION TO BID

NOTICE TO BID

Sealed bids from qualified Contractors for the Rowan-Cabarrus Community College South Campus HVAC Upgrades Project will be received electronically in PDF format only (20 MG Limit) at collegeenvironment@rccc.edu until 3:00 p.m.

on Tuesday, September 29, 2026, local prevailing time. Bids received by the deadline will be publicly opened and read aloud immediately thereafter via Zoom (Link follows). Bidders are encouraged to attend the bid opening in real time.

The Bid Name and IFB # 121-091726JA shall be referenced as the subject line of all emails.

Bids will be received for a single prime – all categories. The proposal shall be a lump sum. All contractors are hereby notified that they must have a proper license as required under the state laws governing their respective trades.

Bids received after the announced time and date for submittal will be rejected. Bidders are responsible for ensuring their bid is received before the deadline indicated. All firms must be registered with the North Carolina Electronic Vendor Portal (eVP and Purchase Orders) prior to presenting a proposal. Failure to register may result in disqualification. North Carolina Electronic Vendor Portal may be found at https://evp.nc.gov/

Contractual Requirement: All bidders must agree to execute a contract that incorporates and adheres to the State of North Carolina's General Terms and Conditions. These terms are available for review at: https://www.doa.nc.gov/north-carolina-general-terms-and-conditions-5-2025/open.

Bid bonds are required in the amount of 5% of the total bid submitted. If paying by check, send it to:

Rowan-Cabarrus Community College PO Box 1595, (1333 Jake Alexander Blvd. S, for courier, etc.)

Salisbury, NC 28145 ATTN: Ronda Holland

Checks must be received by 3:00 pm, Tuesday, September 29, 2026. Only Bid Bond checks can be mailed; bids and other items must be sent via email.

SCOPE OF WORK

The work consists of furnishing all labor, materials, equipment, and services necessary for the construction of the project:

The existing HVAC equipment, as indicated in project documents, is at the end of its statistical life expectancy and has become maintenance intensive. This project will replace two aging chillers (31 and 24 years), which serve the entire campus, with a modular chiller solution to minimize general construction impact. The project will also replace both the S201 and adjacent S202 building air handling units that are original to the buildings and beyond anticipated life. Replace remaining pneumatic controls, which are no longer well supported, will be replaced with direct digital controls. The Building Automation System software will also be upgraded to the College standard to enhance operation of the system.

Replacement of the existing chillers with a modular high efficiency chiller will provide significantly better energy efficiency for the campus, add redundancy by having three 80-ton modular machines and lowering maintenance costs. An alternate is included which would add heat recovery to the new chiller and supply all hot water needed for dehumidification control instead of using natural gas boilers. Replacement of the air handlers will provide improved air quality within the spaces.

Replacement of pneumatic controls and the building automation system software will provide better control and monitoring of the system.

-REPOST

mailto:collegeenvironment@rccc.edu https://evp.nc.gov/ https://www.doa.nc.gov/north-https://www.doa.nc.gov/north-

IFB # 121-091726JA

SCO #23-26928-01B

Drawings will be made available Thursday, September 17, 2026.

Digital (Electronic) plans, specifications and documentation are available by contacting:

Designer:

CMTA, Inc.

8801 J.M. Keynes Drive, Suite 240 Charlotte, North Carolina, 28262 Phone: 704-376-7072 Email: krichey@cmta.com; cltsupport@cmta.com

Mechanical single-prime contractors are notified that Chapter 87, Articles 2 & 4, General Statutes of North Carolina, will be observed in receiving and awarding mechanical contracts.

NOTE – SINGLE PRIME CONTRACTS: On public buildings being bid single prime, where the total value of the general construction does not exceed 25% of the total construction value, contractors under GS87 – Articles 2 and 4 (Plumbing, Mechanical & Electrical) may bid and contract directly with the Owner as the SINGLE PRIME CONTRACTOR and may subcontract to other properly licensed trades. GS87-1.1-Rules .0210

Payment will be made based on ninety-five percent (95%) of monthly estimates and final payment made upon completion and acceptance of work.

No bid may be withdrawn after the scheduled closing time for the receipt of bids for a period of 60 days.

The Owner reserves the right to reject any or all bids and to waive informalities.

ATTACHMENTS

Addendum 1 dated July 30, 2026 Addendum 2 dated August 5, 2026 Addendum 3 dated August 11, 2026 Addendum 4 dated August 17, 2026 Addendum 5 dated September 2, 2026

ZOOM MEETING LINK

Join Zoom Meeting https://rccc-edu.zoom.us/j/91847859218

Meeting chat link https://rccc-edu.zoom.us/launch/jc/91847859218

Meeting ID: 918 4785 9218

One tap mobile +16465588656,,91847859218# US (New York)

+16469313860,,91847859218# US

Join instructions https://rccc-edu.zoom.us/meetings/91847859218/invitations?signature=QH0Q3jZ0CD4q5fJvf8XeVm4Ttcy4BRo8NuUd6hBneqE

END OF ADDENDUM 2

mailto:jcurrie@cmta.com mailto:cltsupport@cmta.com https://rccc-edu.zoom.us/j/91847859218 https://rccc-edu.zoom.us/launch/jc/91847859218 https://rccc-edu.zoom.us/meetings/91847859218/invitations?signature=QH0Q3jZ0CD4q5fJvf8XeVm4Ttcy4BRo8NuUd6hBneqE https://rccc-edu.zoom.us/meetings/91847859218/invitations?signature=QH0Q3jZ0CD4q5fJvf8XeVm4Ttcy4BRo8NuUd6hBneqE

8801 J.M Keynes Drive, Suite 240, Charlotte, NC 28262 | 704.376.7072 | cmta.com Page 1 of 2

Addendum 1

Project: RCCC South Campus HVAC Upgrades

1531 Trinity Church Road

Concord, NC 28027

CMTA # 223.081

SCO ID # 23-26928-01B

Date: July 30, 2026

Owner: Rowan-Cabarrus Community College

Designer: CMTA, Inc.

General Comments

1. Pre-bid meeting minutes and attendance attached from July 28, 2026.

2. Reference to add alternate no. 2 – S202 Boiler Room replacement work.

Pre-bid Request for Information

1. Will the Addendum include bid reference to the add alternate boiler replacement in

S202?

a. Yes

2. Who is the preferred Fire Alarm Contractor for RCCC South Campus?

a. TBD

3. Is HUB participation required?

a. Yes

4. Will CMTA submit the technical documents for permit to Rowan County?

a. Yes, however the prime contractor is responsible for payments and pulling the official license.

CHANGES TO THE SPECIFICATIONS

1. Section 00 01 10 – Table of Contents

a. Updated to include two added spec sections

2. Section 01 23 00 - Alternates

a. References to add Alternate No. 2

3. Section 23 00 60 – Pipe and Pipe Fittings

a. Section added

4. Section 23 52 16 – Condensing Boilers

a. Section updated

CHANGES TO THE DRAWINGS

1. Sheet M216 – MECHANICAL ALTERNATE NO. 2 BUILDING S202 BOILER ROOM

a. Added 140 °F HWR value to sequence of operation.

b. Updated Hot Water Boiler Flow Diagram.

ATTACHMENTS

1. Sign In Sheet & Attendance List

2. Meeting Minutes

3. 00 01 10 – Table of Contents

4. 01 23 00 – Alternates

5. 23 00 60 – Pipe and Pipe Fittings

6. 23 52 16 – Condensing Boilers

7. Sheet M216 – MECHANICAL ALTERNATE NO. 2 BUILDING S202 BOILER ROOM

End of Addendum 1

Rowan-Cabarrus Community College South Campus HVAC Upgrades

CMTA Project 223.081 Pre-Bid

Contractor Meeting Attendance Sign-in Sheet

DATE: July 28, 2026

INITIALS NAME OF ATTENDEE COMPANY

OFFICE

PHONE #

CELL

PHONE #

EMAIL

Toby Phifer Lightpath Electric 704.807.4495 tobyphifer@lightpathinc.net

Jeff Johnston Armstrong Mechanical 704.294.3435 jeffj@armstrongmechanicalnc.com

Paul Armstrong Armstrong Mechanical 704.649.5598 Estimating@armstrongmechanicalnc.com

Austin Craver Mobile Air & Power 980.439.3883 acraver@mobileair.com

Dan Bailey MCI 704.975.1723 dbailey@mcihvac.com

Rudy Oehler MCI 704.914.6691 rudyoehler@mcihvac.com

Sam Guptill Edison Foard 704.994.7425 sguptill@edisonfoard.com

Steven Conaway Stanley Steemer 984.272.1986 Steven.conaway@steemer.com

Jeff Bratschie Stanley Steemer 704.400.5445 Jeff.bratschie@steemer.com

Jacob Whittingham Resilient Energy 704.890.4842 Jacob.whittingham@resrentals.com

Marty Poole Resilient Energy 704.728.8296 Marty.poole@resrentals.com

Mike Cardone Team Mech 704.962.4272 mcardone@team-mech.com

Logan Hrischuk JCI 704.307.9123 Logan.hrischuk@jci.com

Aaron Layton MMI 336.963.3839 aaron@mmicarolina.com

Timmy Eck Daikin Applied 704.589.7461 Timothy.eck@daikinapplied.com mailto:Steven.conaway@steemer.com

1 | P a g e

8801 JM Keynes Drive Suite 240 Charlotte, NC 28262

RCCC South Campus HVAC Upgrades

CMTA Project: 223.081

Date: July 28, 2026

Pre-bid Meeting Minutes

1. The scope of work was reviewed by James Currie of CMTA with the following highlights:

2. Mechanical and electrical improvements (AHU / chiller / VAV controllers / BAS) are to be completed in S201, S202, and S203.

3. Boiler replacement in S202 will be an add alternate to the base bid.

4. Buildings will remain occupied during construction.

5. Temporary services (HVAC and power) need to be provided to maintain temperature conditions within the buildings.

6. A laydown area will be provided in the west parking lot adjacent to S203.

7. The fire alarm system will need to remain active during construction.

8. Temporary AHU equipment will need to be located such that ADA sidewalk egress is not impacted.

9. BAS controls shall be Tridium Niagara framework with BACnet communication.

10. Power interruptions, nighttime work, and weekend work must be coordinated with the College 7-10 days in advance of the requested activity.

11. Contractors shall follow RCCC campus policies / rules regarding conduct and safety.

12. Contractors shall wear PPE gear with company names and phone numbers when on campus.

13. Tobacco products are prohibited in all campus buildings, facilities, college vehicles, walkways, outdoor areas, grounds, and parking lots.

14. The project will include a commissioning agent.

15. The prime and sub-contractors shall coordinate inspections with the CMTA Construction Administrator; SCO Electrical Inspector; and the local AHJ.

16. The project will be monitored by the State Construction Office.

17. Weekly meetings will be conducted with a monthly OAC meeting held with the SCO Monitor.

18. Pre-bid questions may be submitted up to 2:00 p.m. on Tuesday, August 11, 2 | P a g e

8801 JM Keynes Drive Suite 240 Charlotte, NC 28262

2026, to cltsupport@cmta.com.

19. Bids will be due at 2:00 p.m. on Tuesday, August 18, 2026. Bids received by the deadline will be publicly opened and read aloud immediately thereafter via Zoom. The following is the link:

https://rccc-edu.zoom.us/j/93017186720

Contractor Comments / Clarifications:

1. Will the Addendum include bid reference to the add alternate boiler replacement in S202?

a. Yes

2. Who is the preferred Fire Alarm Contractor for RCCC South Campus?

a. TBD

3. Is HUB participation required?

a. Yes

4. Will CMTA submit the technical documents for permit to Rowan County?

a. Yes, however the prime contractor is responsible for payments and pulling the official license.

RCCC South Campus HVAC Upgrades SCO #23-26928-01B

223.081 Addendum 1

07.30.2026

TABLE OF CONTENTS 00 01 10 - 1

DIVISION 00 — PROCUREMENT AND CONTRACTING REQUIREMENTS

00 01 01 - Project Title Page

00 01 05 - Seals Page

00 01 10 - Table of Contents

00 02 19 - Notice to Bidders

00 73 00 - General Conditions CMAR SCO OC-15Cm September 2025

00 80 00 - Form of Proposal

00 80 02 - Mb Guidelines 2002R

00 80 03 - Form of Construction Contract

DIVISION 01 — GENERAL REQUIREMENTS

01 10 00 - Summary

01 21 00 - Allowances

01 22 00 - Unit Prices

01 23 00 - Alternates

01 26 00 - Contract Modification Procedures

01 29 00 - Payment Procedures

01 31 19 - Project Meetings

01 32 00 - Construction Schedules

01 32 19 - Submittals

01 42 19 - Reference Standards

01 50 00 - Temporary Facilities and Controls

01 74 23 - Cleaning

01 77 19 - Closeout Requirements

01 78 23 - Operation and Maintenance Data

01 78 39 - Project Record Documents

01 91 13 - General Commissioning Requirements

DIVISION 02 — EXISTING CONDITIONS

02 41 19 - Selective Demolition

DIVISION 03 — CONCRETE

03 10 00 - Concrete Forming and Accessories

03 20 00 - Concrete Reinforcing

DIVISION 21 — FIRE SUPPRESSION

21 05 00 - Common Work Results for Fire Suppression

21 05 13 - Common Motor Requirements for Fire Suppression Equipment

21 05 17 - Sleeves and Sleeve Seals for Fire-Suppression Piping

21 13 13 - Wet Standpipe and Sprinkler Systems

DIVISION 23 — HEATING VENTILATING AND AIR CONDITIONING

23 00 60 - Pipe and Pipe Fittings

23 01 02 - Demolition

23 05 00 - Common Work Results for HVAC

23 05 01 - Scope of the HVAC Work

23 05 02 - Shop Drawings, Maintenance Manuals and Parts Lists for HVAC

23 05 13 - Common Motor Requirements for HVAC Equipment

23 05 17 - Sleeving and Sleeve Seals for HVAC Piping

23 05 19 - Meters and Gauges for HVAC Piping

23 05 53 - Identification for HVAC Piping and Equipment

23 05 93 - Testing, Adjusting and Balancing for HVAC

07.30.2026

TABLE OF CONTENTS 00 01 10 - 2

23 06 75 - Fan Array Air Handling Units

23 07 13 - Duct Insulation

23 07 19 - HVAC Piping Insulation

23 07 90 - Electric Heating Devices

23 08 00 - Commissioning of Mechanical Systems

23 09 00 - Controls and Instrumentation

23 09 02 - Control Dampers

23 09 03 - Control Instrumentation

23 09 04 - Metering Devices

23 09 10 - Facility Monitoring System

23 09 20 - Variable Frequency Motor Control

23 09 41 - Chemical Treatment and Cleaning Hot and Chilled Water Systems

23 21 00 - Excavation, Trenching, Backfilling and Grading

23 21 13 - Pipe and Pipe Fittings

23 21 16 - Hydronic Piping Specialties

23 21 23 - Hydronic Pumps

23 25 00 - HVAC Water Treatment, Cleaning Filling, and Purging

23 31 13 - Metal Ducts

23 33 00 - Air Duct Accessories

23 34 23 - HVAC Power Ventilators

23 36 00 - Air Terminal Units

23 37 13 - Diffusers, Registers & Grilles

23 51 16 – Boiler Breeching and Stacks

23 52 16 – Condensing Boilers

23 73 13.13 - Indoor, Central-Station Air-Handling Units

23 82 41 - Water-To-Water Heat Pump

DIVISION 26 — ELECTRICAL

26 00 00 - Electrical Specifications Index

26 01 00 - General Provisions - Electrical

26 01 11 - Electrical Outline of Work

26 01 14 - Demolition and Phasing

26 01 20 - Division of Work for Divisions 23 and 26

26 01 34 - Electrical Connections

26 05 19 - Low-Voltage Electrical Power Conductors and Cables

26 05 23 - Control-Voltage Electrical Power Cables

26 05 26 - Grounding and Bonding for Electrical Systems

26 05 31 - Conduit

26 05 37 - Sleeves and Penetrations

26 05 39 - Fire Seals

26 05 41 - Boxes and Enclosures

26 05 53 - Identification for Electrical Systems

26 05 74 - Overcurrent Protection Device Coordination Study

26 08 00 - Commissioning of Electrical Systems

26 09 13 - Electrical Power Monitoring

26 24 13 - Switchboards

26 28 16 - Enclosed Switches and Circuit Breakers

26 43 00 - Surge Protection Devices

26 90 00 - Project Closeout

07.30.2026

ALTERNATES 01 23 00 - 1

SECTION 01 23 00 - ALTERNATES

PART 1 - GENERAL

1.1 SUMMARY:

A. This Section includes administrative and procedural requirements for alternates.

1.2 DEFINITIONS:

A. Alternate: An amount proposed by bidders and stated on the Bid Form for certain work defined in the Bidding Requirements that may be added to or deducted from the Base Bid amount if Owner decides to accept a corresponding change either in the amount of construction to be completed or in the products, materials, equipment, systems, or installation methods described in the Contract Documents.

B. The cost or credit for each alternate is the net addition to or deduction from the Contract Sum to incorporate alternate into the Work. No other adjustments are made to the Contract Sum.

1.3 PROCEDURES:

A. Coordination: Modify or adjust affected adjacent work as necessary to completely integrate work of the alternate into Project.

B. Include as part of each alternate, miscellaneous devices, accessory objects, and similar items incidental to or required for a complete installation whether or not indicated as part of alternate.

C. Notification: Immediately following award of the Contract, notify each party involved, in writing, of the status of each alternate. Indicate if alternates have been accepted, rejected, or deferred for later consideration. Include a complete description of negotiated modifications to alternates.

D. Execute accepted alternates under the same conditions as other work of the Contract.

E. Schedule: A Schedule of Alternates is included at the end of this Section. Specification Sections referenced in schedule contain requirements for materials necessary to achieve the work described under each alternate.

PART 2 - PRODUCTS (Not Used)

07.30.2026

ALTERNATES 01 23 00 - 2

PART 3 - EXECUTION

3.1 SCHEDULE OF ALTERNATES

Alternate No. 1: Provide building automation system and integration per mechanical plans and specification section 23 09 00, 23 09 02, 23 09 03, 23 09 04 as installed/programmed by Environmental Control & Mechanical.

Dollars ($ )

Alternate No. 2: Provide labor and materials to demolish and replace the existing boiler system in

Building S202 per mechanical sheet M201 and specification sections .

END OF SECTION 01 23 00

07.30.2026

PIPE AND PIPE FITTINGS 23 00 60 - 1

SECTION 23 00 60 – PIPE AND PIPE FITTINGS

PART 1 - GENERAL

1.1 SCOPE OF DIVISION 23 WORK:

A. This work shall consist of furnishing all labor, material, equipment and services necessary for the installation of all equipment specified hereinafter.

B. Systems, piping and components principally relevant to this section include:

1. Hot water supply and return piping and fittings

2. Chilled water supply and return piping and fittings

3. Condenser water supply and return piping and fittings

4. Condensate drain and makeup water supply piping and fittings

5. Chilled water supply and return piping and fittings

6. Other items where shown on the drawings or as specified.

PART 2 - PRODUCTS

2.1 HOT WATER SUPPLY AND RETURN PIPING AND FITTINGS:

A. The pipe material shall be Schedule 40 Black Steel and conform to ASTM A53 as manufactured by Republic Steel, National Tube or Youngstown.

B. Fittings 2" and smaller shall be of screwed cast iron and shall conform to ASA B16.3, B2.1 and

ASTM A126 Class A or malleable iron.

C. Fittings 2 1/2" and larger welded steel.

D. All steel fittings shall conform to ASA B16.4, B2.1 and ASTM-A126 Class A.

E. Welding fittings: With the exception of pipe welded end-to-end, all welding joints shall be made by the use of one-piece welding neck flanges, nozzles, elbows, tees, etc. as manufactured by Tube-Turn, Grinnell, Ladish or Taylor-Forge. All welding elbows shall be long radius elbow. Welding end fittings shall have the same bursting pressure as pipe of the same size and schedule. Tee fittings shall be one piece except that shaped nipples are permitted where branches are at least two pipe sizes less than the main.

F. Flanged fittings: Flanges and flanged fittings shall conform to ASA Standard B16.5 and

ASTM-A181 for 150 lb. and 300 lb. class.

2.2 CHILLED WATER SUPPLY AND RETURN PIPING AND FITTINGS:

A. Chilled Water Supply And Return Piping And Fittings

PIPE AND PIPE FITTINGS 23 00 60 - 2

1. The pipe material shall be Schedule 40 black steel and conform to ASTM A53 as manufactured by Republic Steel, National Tube or Youngstown.

B. Fittings 2" and smaller shall be screwed cast iron and shall conform to ASA B16.3, B2.1 and

ASTM A47 Grade 32510 or malleable iron.

C. Fittings 2-1/2" and larger welded steel.

D. All steel fittings shall conform to ASA B16.4, B2.1 and ASTM-A126 Class A.

E. Welding fittings: With the exception of pipe welded end-to-end, all welding joints shall be made by the use of one-piece welding neck flanges, nozzles, elbows, tees, etc. as manufactured by Tube-Turn, Grinnell, Ladish or Taylor-Forge. All welding elbows shall be long radius elbows. Welding and fittings shall have the same bursting pressure as pipe of the same size and schedule. Tee fittings shall be one piece except that shaped nipples are permitted where branches are at least two pipe sizes less than the main.

F. Flange fittings: Flanges and flanged fittings shall conform to ASA Standard B16.5 and ASTM-

A181 for 150 lb. and 300 lb. class.

2.3 CONDENSER WATER SUPPLY AND RETURN PIPING AND FITTINGS:

A. Pipe and fitting material for above ground installation shall be same as chilled water system.

2.4 CONDENSATE DRAIN PIPING AND MAKE-UP WATER SUPPLY PIPING AND

FITTINGS:

A. Pipe material for above ground installation shall be type “L” hard drawn copper tubing with 125 psi solder joint wrought copper fittings.

B. Fittings for copper pipe shall be wrought copper, or cast brass.

PART 3 - EXECUTION

3.1 General:

A. For purposes of clearances and legibility, the contract documents are essentially diagrammatic and, although size and location of piping are drawn to scale wherever possible, contractor shall make use of all data in all of the contract documents and shall verify this information at building site.

B. The contract documents indicate required size and points of termination of pipes and suggest proper routes of piping to conform to structure, avoid obstructions and preserve clearances.

However, it is not intended that the contract documents indicate all necessary offsets, and it shall be the work of this section to install piping in such a manner as to conform to structure, avoid obstructions, preserve headroom and keep openings and passageways clear, without

PIPE AND PIPE FITTINGS 23 00 60 - 3

further instructions or cost to the Owner. The contractor shall fully inform himself regarding any and all peculiarities and limitations of the spaces available for the installation of all work and materials furnished and installed under the contract. He shall exercise due and particular caution to determine that all parts of his work are made quickly and easily accessible. Although the locations of the equipment and piping may be shown on the contract documents in certain positions, the contractor shall be guided by the architectural details and conditions existing at the job, correlating this work with that of others. Provide all offsets as required to produce a neat, workmanlike arrangement.

C. The contractor shall study all drawings and specifications to determine any conflict with ordinances and statutes. Any errors or omissions shall be reported, and any changes shall be shown on drawings made by this section, and any additional work performed at no additional cost to the Owner.

D. Submittal of bid shall indicate the contractor has examined the site and contract documents and has included all required allowances in his bid. No allowance shall be made for any error resulting from contractor's failure to visit job sites and to review contract documents and bid shall include costs for all required drawings and changes as outlined above, all at no additional cost to the Owner.

E. All piping shall be installed to prevent unusual noise from the flow of water under normal conditions. Insert one (1) inch strip of hair felt to isolate all piping from any direct contact with any part of the building, framing, conduit, etc.

F. Springing, bending or forcing of pipe will not be allowed. Use fittings for all offsets or changes in alignment of piping.

G. All changes in directions shall be made with approved fittings. Mitering, saddling or welding of smaller pipe and larger piping is prohibited.

H. Pipe openings shall be closed with caps or plugs during installation. Rags and tin cans are not considered suitable closures. Pipe openings in terrazzo floors shall have semi-permanent closures during construction.

I. Damage by leaks - This contractor shall be responsible for damage to the grounds, walks, road, buildings, pipe systems, electrical systems and their equipment and contents, caused by leaks in the piping system being installed or having been installed herein. He shall repair at his expense all damage so caused. All repair work shall be performed as directed by the Architect.

J. The use of chemicals or so-called "Stop-Leak" compounds will not be permitted at any time.

K. Unions shall be provided at connection to all equipment.

L. Escutcheon plates shall be provided at all penetrations of walls, ceilings, floors, etc.

M. All items of equipment shall be provided with approved vacuum breakers to prevent backflow, as required by State Health Department and local authorities having jurisdiction. All waste connections shall be installed with approved air break fittings to comply with the above requirements. Vacuum breakers where shown on Drawings or required shall be angle pattern

PIPE AND PIPE FITTINGS 23 00 60 - 4

with built-in lift type check valves as manufactured by Bidoro Manufacturing Company or approved equal.

N. Drain Valves: Install on each mechanical equipment item located to completely drain equipment for service or repair. Install at base of each riser, at base of each rise or drop in piping system, and elsewhere where indicated or required to completely drain hot/chilled water piping system.

3.2 PIPE JOINING METHODS:

A. Joints:

1. Steel Pipe Joints: (2" and smaller): Thread pipe with tapered pipe threads in accordance with ANSI B2.1. Cut threads full and clean using sharp dies. Ream threaded ends to remove burrs and restore full inside diameter. Apply pipe joint lubricant or sealant suitable for the service for which the pipe is intended on the male threads at each joint and tighten joint to leave not more than 3 threads exposed.

2. Pipe Larger Than 2": Weld pipe joints in accordance with ASME Code for Pressure

Piping, B31.

B. Weld pipe joints of exterior water service pipe in accordance with AWWA C206.

C. Install flanges on all valves, apparatus, and equipment. Weld pipe flanges to pipe ends in accordance with ASME B31.1.0 Code for Pressure Piping. Clean flange faces and install gaskets. Tighten bolts to torque specified by manufacturer of flange and flange bolts, to provide uniform compression of gaskets.

D. Thoroughly clean tube surface and inside surface of the cup of the fittings, using very fine emery cloth, prior to making soldered or brazed joints. Wipe tube and fittings clean and apply flux. Flux shall not be used as the sole means for cleaning tube and fitting surfaces.

E. Joints for other piping materials are specified within the respective piping system sections.

F. Weld pipe joints in accordance with ANSI B31. Weld pipe joints in accordance with recognized industry practice and as follows:

G. Weld pipe joints only when ambient temperature is above 0F (-18C) where possible.

H. Bevel pipe ends at a 37.5 degree angle where possible, smooth rough cuts, and clean to remove slag, metal particles and dirt.

I. Install welding rings for buttwelded joints.

J. Use pipe clamps or tack-weld joints with 1" long welds; 4 welds for pipe sizes to 10", 8 welds for pipe sizes 12" to 20".

K. Build up welds with stringer-bead pass, followed by hot pass, followed by cover or filler pass.

Eliminate valleys at center and edges of each weld. Weld by procedures which will ensure elimination of unsound or unfused metal, cracks, oxidation, blow-holes and non-metallic inclusions.

PIPE AND PIPE FITTINGS 23 00 60 - 5

L. Do not weld-out piping system imperfections by tack-welding procedures; refabricate to comply with requirements.

M. At installer's option, install forged branch-connection fittings wherever branch pipe is indicated;

or install regular "T" fitting.

N. Flanged Joints: Match flanges within piping system, and at connections with valves and equipment. Clean flange faces and install gaskets. Tighten bolts to provide uniform compression of gaskets.

3.3 HOT WATER SUPPLY AND RETURN PIPING SYSTEM:

A. The drawings indicate schematically the size and location of piping. Piping shall be set up and down and offset to meet field conditions and coordination between trades without additional cost.

B. Pipework shall conform fully to the following requirements:

1. Provide proper provision for expansion and contraction in all portions of pipework, to prevent undue strains on piping or apparatus connected therewith. Provide double swings at coil connections riser transfers and other offsets whenever necessary to take up expansion. Arrange riser branches to take up motion of riser.

2. Approved bolts, gaskets, flanges (screwed or welded) shall be installed at all apparatus and appurtenances, and wherever else required to permit easy connection and disconnection. Screwed unions shall be provided as specified on piping 2-1/2" or less.

3. All piping connections to coils and equipment shall be made with offsets provided with screwed or welded bolted flanges so arranged that the equipment can be serviced or removed without dismantling the piping.

4. Provide dielectric unions or installing flanges for copper or brass to steel piping system joints.

C. If, after system is in operation, any apparatus is stratified or air bound (by vacuum or pressure), they shall be repiped with new, approved and necessary fittings, air vents, or vacuum breakers at no extra cost. If connections are concealed in furring, floors, or ceilings, this contractor shall bear all expense of tearing up and refinishing construction and finish, leaving same in as good condition as before it was disturbed.

D. Miscellaneous drains, vents and reliefs are to be provided as follows:

1. Provide 3/4" hose and drain valves near the heel of all water risers in an accessible location.

E. Miscellaneous drains, vents, reliefs, and over-flows from tanks, equipment, piping, relief valves, pumps, etc. shall be run to he nearest open sight drain or roof drain. Provide 3/4" drain valves for complete drainage of piping, including the system side of all pumps.

F. Provide domestic water connections from valves outlets to any equipment requiring same, including expansion tanks.

PIPE AND PIPE FITTINGS 23 00 60 - 6

G. Screwed piping shall conform to the following: Pipe Nipples: Any piece of pipe 3" in length or less shall be considered a nipple. All nipples with unthreaded portion 1-1/2" and less shall be extra heavy. Only shoulder nipples shall be used. No close nipples will be provided.

H. Screw threads shall be cut clean and true: screw joints made tight without caulking. No caulking will be permitted. A non-hardening lubricant will be used. No bushings shall be used.

Reductions, otherwise causing objectionable water or air pockets, to be made with eccentric reducers or eccentric fittings. All pipe shall be reamed out after cutting to remove all burrs.

I. Welding piping shall conform to the following:

1. All welded joints for steel pipe shall be of the open V-butt following approved welding procedures for metallic arc or oxyacetylene (from pipe sizes 2" and under) carbon steel welded pipe joints. Pipe shall be mill-beveled or machine beveled by this trade. All scale and oxide must be removed with hammer, chisel or file, and the bevel left smooth and clean.

2. Weld metal shall be thoroughly fused with base metal at all sections of weld and penetration of weld shall include non-beveled portion and shall extend to inside walls of pipe.

J. Pitch water piping upward in direction of flow to ensure adequate flow without air binding, and to prevent noise and water hammer. Branch connections to mains are to be made in such a manner to prevent air trapping and permit free passage of air. To meet job conditions mains shall be set up to maintain headroom, and clear other trades. Provide oversized float operated automatic air vent (with valve and strainer) at all high points in hot and chilled water piping, particularly at the highest points of return mains and risers. Avoid 90 degree lift set-ups in supply lines by using 45 degree ells. Where 90 degree lifts exceed 12" install automatic air vent in supply lines. All lifts in return lines shall be installed with automatic air vents to an open sight drain if the vent is concealed, or to within two feet of the floor within machine rooms.

END OF SECTION 23 00 60

CONDENSING BOILERS 23 52 16 - 1

SECTION 23 52 16 - CONDENSING BOILERS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section includes factory-fabricated, gas-fired, floor-mounted condensing boilers, trim, and accessories for generating heating hot water.

B. Boilers shall be suitable for fully condensing operation and compatible with variable flow hydronic systems.

C. Boiler communication interface shall be BACnet compatible for integration with the Building

Automation System (BAS).

1.3 SUBMITTALS

A. Product Data: For each type of product.

1. Include construction details, material descriptions, dimensions of individual components and profiles, and finishes.

2. Include rated capacities, operating characteristics, and furnished specialties and accessories.

3. Include venting, combustion air, electrical, and condensate requirements.

B. Shop Drawings: For boilers, boiler trim, and accessories.

1. Include plans, elevations, sections, and mounting details.

2. Include details of equipment assemblies, dimensions, weights, loads, required clearances, and location and size of field connections.

3. Include diagrams for power, signal, and control wiring.

C. Source quality-control reports.

D. Warranty: Special warranty specified in this Section.

E. Product Certificates:

1. ASME Stamp Certification and Report.

F. Operation and Maintenance Data.

CONDENSING BOILERS 23 52 16 - 2

1.4 QUALITY ASSURANCE

A. Electrical Components, Devices, and Accessories: Listed and labeled in accordance with NFPA

70 by a qualified testing agency and marked for intended location and application.

B. ASME Compliance: Fabricate and label boilers to comply with ASME Boiler and Pressure

Vessel Code requirements.

C. ASHRAE 90.1 Compliance: Boilers shall comply with minimum efficiency requirements of

ASHRAE 90.1.

D. DOE Compliance: Boilers shall comply with applicable federal efficiency requirements.

E. UL Compliance: Boilers shall be listed and labeled by a qualified testing agency acceptable to authorities having jurisdiction.

F. Boiler manufacturer shall have minimum five years documented experience manufacturing commercial condensing boilers.

G. Boilers shall be factory assembled and factory tested prior to shipment.

H. Install boilers in accordance with manufacturer’s written instructions and applicable codes.

1.5 COORDINATION

A. Coordinate size and location of concrete bases. Cast anchor-bolt inserts into bases. Concrete, reinforcement, and formwork requirements are specified with concrete.

1.6 WARRANTY

A. Special Warranty: Manufacturer agrees to repair or replace components of condensing boilers that fail in materials or workmanship within the specified warranty periods under normal use and service conditions.

B. Warranty shall include replacement or repair of defective components, excluding failures resulting from improper installation, improper water treatment, operation outside manufacturer’s published limits, or lack of required maintenance.

C. Warranty Periods:

1. Heat Exchanger Warranty:

a. Minimum 10-year warranty against failure due to thermal stress, flue gas condensate corrosion, or defects in materials and workmanship.

2. Boiler Parts Warranty:

a. Minimum one-year warranty for controls, burner components, electrical components, and associated boiler trim from date of Substantial Completion

D. Warranty shall commence upon Substantial Completion of the Project.

CONDENSING BOILERS 23 52 16 - 3

E. Submit manufacturer's written warranty documentation as part of closeout submittals.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Electrical Components, Devices, and Accessories: Listed and labeled in accordance with NFPA

70 by a qualified testing agency acceptable to authorities having jurisdiction.

B. ASME Compliance: Boilers shall be fabricated and labeled in accordance with ASME Boiler and Pressure Vessel Code.

C. Boiler shall comply with applicable ANSI Z21.13 standards.

D. Boilers shall comply with minimum efficiency requirements of ASHRAE 90.1 and applicable federal energy regulations.

E. Boilers shall be suitable for fully condensing operation.

F. Boilers shall be capable of interfacing with the Building Automation System (BAS) using

BACnet communication protocol.

G. Minimum boiler turndown ratio shall be 10:1.

2.2 FLOOR-MOUNTED CONDENSING BOILERS

A. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

1. Lochinvar

2. Aerco

3. Raypak

4. Laars

5. Patterson-Kelley

B. Description: Factory-fabricated, assembled, and tested condensing boilers with sealed combustion chamber, insulated jacket, controls, vent connections, combustion air connections, and condensate drain assembly.

C. Heat Exchanger:

1. Heat exchanger shall be ASME-stamped and suitable for sustained condensing operation.

2. Heat exchanger shall be constructed of stainless steel or other corrosion-resistant material specifically listed by the manufacturer for condensing boiler service.

3. Heat exchanger shall be designed for hydronic heating hot water service and rated for minimum 160 psig working pressure.

4. Boiler shall be suitable for variable-flow or primary-secondary piping arrangements, where permitted by manufacturer.

5. Aluminum heat exchangers are not acceptable unless specifically approved by Engineer.

CONDENSING BOILERS 23 52 16 - 4

D. Combustion Chamber and Flue Gas Services: Corrosion-resistant stainless steel or other corrosion-resistant materials suitable for sustained condensing boiler operation.

E. Pressure Vessel: Constructed in accordance with ASME requirements for hydronic heating service.

F. Burner: Factory-installed, fully modulating premix burner with minimum 10:1 turndown ratio, designed for natural gas operation and low NOx combustion.

G. Blower: Centrifugal fan to operate during each burner-firing sequence and to pre-purge and post-purge the combustion chamber.

H. Gas Train: Combination gas valve with manual shutoff and pressure regulator.

I. Ignition: Direct-spark ignition or silicone carbide hot-surface ignition with 100 percent main-valve shutoff and electronic flame supervision.

J. Casing: Factory-fabricated, removable, corrosion-resistant steel jacket with manufacturer’s standard baked enamel or powder-coated finish. Provide access panels as required for service, inspection, and maintenance of burners, controls, heat exchanger, and piping connections.

2.3 TRIM - FOR HOT-WATER BOILERS

A. Provide factory-mounted and factory-wired trim and accessories required for proper boiler operation, safety, and control.

B. Trim shall include, but not be limited to, the following:

1. ASME-rated pressure relief valve.

2. Temperature and pressure gauges.

3. Low-water cutoff.

4. Flow switch.

5. Air vent.

6. Drain valve.

7. Gas pressure regulator where required by manufacturer.

8. Condensate drain connection.

9. Operating and safety controls.

10. Manual reset high-limit control.

C. Provide controls and safeties in accordance with ASME CSD-1 and manufacturer requirements.

2.4 CONTROLS

A. Boiler operating controls shall include the following devices and features:

1. Control transformer.

2. Set-Point Adjustment: Set points shall be adjustable.

CONDENSING BOILERS 23 52 16 - 5

3. Operating Temperature Control: Factory-installed and wired controls shall cycle and modulate burner operation to maintain adjustable hot-water supply temperature set point.

4. Sequence of Operation: Boiler controls shall be capable of resetting hot-water supply temperature based on outdoor-air temperature. Reset schedule shall be adjustable.

B. Burner Operating Controls: To maintain safe operating conditions, burner safety controls shall limit burner operation.

1. High Cutoff: Manual reset shall stop burner operation when operating conditions exceed maximum boiler design water temperature or pressure.

2. Low-Water Cutoff Switch: Electronic probe shall prevent burner operation on low water.

Cutoff switch shall be manual-reset type.

3. Alarm: Factory-mounted alarm or fault indication shall annunciate unsafe operating conditions at the boiler control panel.

C. Building Automation System Interface: Provide factory-installed hardware and software to enable BAS monitoring and control of boiler status, alarms, and operating set points.

1. Communication interface shall support BACnet communication for integration with the

BAS. Control features and monitoring points available locally at boiler control panel shall also be available through BAS where supported by manufacturer.

2. Hardwired Points:

a. Monitoring:

1) On/off status.

2) Common alarm.

3) Hot-water supply temperature.

4) Hot-water supply temperature set point.

b. Control:

1) Enable/disable.

2) Hot-water supply temperature set-point adjustment.

2.5 ELECTRICAL POWER

A. Controllers, Electrical Devices, and Wiring: Electrical devices and connections are shown on

Drawings and specified in Division 26 Sections.

B. Single-Point Field Power Connection: Factory-installed and factory-wired switches, motor controllers, transformers, and other electrical devices necessary for boiler operation shall provide a single-point field power connection to boiler.

1. Factory wiring and electrical components shall comply with UL and NEC requirements.

2. Control panel enclosure shall be NEMA 250, Type 1 minimum.

3. Boiler shall include terminal strip connections for interfacing with the Building

Automation System (BAS).

4. Wiring shall be numbered and color coded in accordance with manufacturer standards.

5. Install factory wiring outside of an enclosure in metal raceway.

6. Provide motor overcurrent protection in accordance with manufacturer requirements.

CONDENSING BOILERS 23 52 16 - 6

2.6 VENTING

A. Vent materials shall be listed and approved for condensing boiler applications.

B. Combustion-air intake and exhaust vent systems shall comply with boiler manufacturer requirements and applicable codes.

C. Venting materials shall be suitable for positive-pressure condensing flue gas service.

2.7 CONDENSATE-NEUTRALIZATION UNITS

A. Provide factory-recommended condensate-neutralization unit suitable for condensing boiler service.

B. Neutralization unit shall be sized for the connected boiler condensate flow rate and input capacity.

C. Neutralization media shall be replaceable limestone, marble chips, or approved equivalent material.

D. Condensate-neutralization unit shall be constructed of corrosion-resistant materials suitable for acidic condensate service.

E. Pipe condensate from boilers through neutralization unit prior to discharge to sanitary drain.

F. Install condensate-neutralization unit in accordance with manufacturer’s written instructions.

2.8 SOURCE QUALITY CONTROL

A. Test and inspect factory-assembled boilers before shipment in accordance with ASME Boiler and Pressure Vessel Code.

B. Factory test boilers to verify proper operation, safety controls, and compliance with manufacturer’s quality-control procedures.

C. Perform hydrostatic test of pressure vessel at factory.

D. Allow Owner or Engineer access to source quality-control testing of boilers when requested.

Notify Engineer 14 days in advance of testing.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine roughing-in for concrete equipment bases, anchor-bolt sizes and locations, and piping and electrical connections to verify actual locations, sizes, and other conditions affecting performance of the Work.

CONDENSING BOILERS 23 52 16 - 7

1. Final boiler locations indicated on Drawings are approximate. Determine exact locations before roughing-in for piping and electrical connections.

B. Examine mechanical spaces for suitable conditions where boilers will be installed.

C. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 BOILER INSTALLATION

A. Equipment Mounting: Install boilers on concrete housekeeping pads. Install elastomeric pads where indicated.

B. Install gas-fired boilers in accordance with NFPA 54 and manufacturer’s written instructions.

C. Assemble and install boiler trim and accessories.

D. Install electrical devices furnished with boiler but not specified to be factory mounted.

E. Install control wiring to field-mounted electrical devices.

F. Install venting and combustion-air piping in accordance with manufacturer requirements.

G. Install condensate piping and condensate-neutralization units in accordance with manufacturer requirements.

H. Coordinate boiler installation with piping, venting, electrical, and Building Automation System

(BAS) requirements.

3.3 CONNECTIONS

A. Piping, venting, electrical, and controls installation requirements are specified in other Sections.

Drawings indicate general arrangement of connections.

B. Install piping, venting, electrical, and control connections adjacent to boilers to allow service and maintenance access.

C. Connect hot-water supply and return piping to boiler connections with shutoff valves and unions or flanges.

D. Connect gas piping to boiler gas-train inlet with union. Piping shall be at least full size of boiler connection. Provide reducer where required.

E. Install drain piping from boiler drain and condensate connections to nearest approved drain.

Provide condensate-neutralization unit upstream of drain connection.

F. Install piping from safety relief valves to nearest approved drain.

G. Boiler Venting: Install flue venting and combustion-air intake in accordance with manufacturer’s written instructions. Connect full size to boiler connections.

CONDENSING BOILERS 23 52 16 - 8

H. Ground equipment according to Section 26 05 26 "Grounding and Bonding for Electrical

Systems."

I. Connect wiring according to Section 26 05 19 "Low-Voltage Electrical Power Conductors and

Cables."

J. Connect controls and BAS interface wiring in accordance with manufacturer’s written instructions and Division 23 controls requirements.

3.4 FIELD QUALITY CONTROL

A. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect boiler installation, verify connections, perform startup, and assist in testing.

B. Perform installation and startup checks in accordance with manufacturer’s written instructions.

C. Perform the following tests and inspections:

1. Verify proper installation of boiler, trim, piping, venting, combustion-air intake, electrical connections, and controls.

2. Start units to confirm proper operation.

3. Perform combustion analysis and adjust burner in accordance with manufacturer’s written instructions.

4. Test and adjust operating controls and safety devices.

5. Check and adjust initial operating setpoints and high- and low-limit safety setpoints.

D. Repair or replace damaged or malfunctioning controls and equipment and retest.

E. Prepare startup and test reports and submit to Engineer.

3.5 DEMONSTRATION

A. Engage a factory-authorized service representative to train Owner’s maintenance personnel to adjust, operate, and maintain boilers and associated controls.

B. Training shall include:

1. Startup and shutdown procedures.

2. Normal operating procedures.

3. Safety controls and alarm conditions.

4. Routine maintenance requirements.

5. Condensate-neutralization system maintenance.

6. BAS interface overview.

C. Provide operation and maintenance manuals prior to demonstration.

END OF SECTION 23 52 16

E

BOILER

180A

EX. B-1

54x28 RA

EX. ET-1

EX. HWP-1

EX. AS-1

8" BF

2 1/2" HWR

G

H W

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H W

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M216

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BOILER

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ET-1-202

HWP-1-202

AS-1-202

8" BF

2 1/2" HWR

(EX)FDS

EMERGENCY GAS

SHUTOFF FOR

BOILER, B-1-202.

H W

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H W

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POINT DESCRIPTION

HARDWARE SOFTWARE

SYSTEM:

POINT LIST

NOT TO SCALE

DIFFERENTIAL PRESSURE TRANSMITTER

PRESSURE TRANSMITTER

HUMIDITY

TEMPERATURE

PRESSURE

DIFFERENTIAL

STATIC

ANALOG

INPUT

DISCRETE

OUTPUT

DEGREE FAHRENHEIT

INCHES WATER COLUMN

PERCENT RELATIVE HUMIDITY

NORMALLY OPEN

NORMALLY CLOSED

FREEZESTAT

BAS INPUT

BAS OUTPUT

SMOKE DETECTOR

AMPS

STANDALONE DIGITAL CONTROLLER

NETWORK CONTROL UNIT

VARIABLE AIR VOLUME

UNIT CONTROLLER

TERMINAL

PORTABLE OPERATORS

CONTROL LEGEND

DP

PT

H

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D

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CONTROL DAMPER

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S.D.

AM

PSIA

PSIG

PSID

AUX MOTOR AUXILIARY CONTACTS

%RH

HUMIDITY TRANSMITTER

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TEMPERATURE TRANSMITTER

CONNECTED TO AN ANALOG INPUT

DAMPER OPERATOR CONNECTED

TO AN ANALOG INPUT

DAMPER OPERATOR CONNECTED

TO A DISCRETE OUTPUT

DIFFERENTIAL PRESSURE SWITCH

CONNECTED TO A DISCRETE INPUT

HIGH PRESSURE TAPHI

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TEMPERATURE SENSOR W/AVERAGING

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MOTOR AMPS FROM A CT/

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4-20MA

VFD VARIABLE FREQUENCY DRIVE

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SDC

POT PORTABLE OPERATORS TERMINAL (BY OWNER)

FIBEROPTIC CABLEF/O

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PROCESS DIAGRAM - BOILER B-1-202

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ANALOG DIGITAL ANALOG

INPUT ALARMS

DIGITAL ANALOG

BAS FUNCTIONS

BOILER

CONTROL PUMPS

TO LOWEST DP

(TYPICAL OF 2)

P

PIPING PRESSURE (TYP. FOR 2)

BOILER RESET

H W

R

H W

S

HOT WATER RETURN

CONTROL VALVE

HOT WATER SUPPLY

HWP-1-202

BOILER

HWR

HWB-1-202

PROVIDE SEPARATE BOILER PLANT CONTROL FOR EACH FLOOR - CONTROL TYPICAL FOR EACH

THE BOILER SYSTEM SHALL BE ENERGIZED WHEN THE FOLLOWING CONDITIONS ARE MET:

*…