MDOT Southwest Region Office - Replace HVAC System - Addendum 1.pdf

DTMB-0414 (Rev 6/25)

DEPARTMENT OF TECHNOLOGY, MANAGEMENT AND

BUDGET

State Facilities Administration Design & Construction Division

CONSTRUCTION BID ADDENDUM NO. 1

This form identifies an Addendum to Bidding Documents, and incorporates interpretations or clarifications, modifications, acceptance of proposed “or equal” materials, and other information into the Bidding Documents. Addenda will be numbered by the Professional and distributed through www.michigan.gov/SIGMAVSS as an attachment.

TO:

ALL BIDDERS

DATE ISSUED

10/22/2026

PROJECT NAME

MDOT Southwest Region Office - Replace HVAC System

FILE NUMBER

591/22395.JLM

PROFESSIONAL

Matrix Consulting Engineers

PROJECT DIRECTOR

Josiah Meyers

BID OPENING DATE:

10/28/2026

ADDENDUM ITEMS:

1. Issued Specification Section 238233 – Convectors (attached)

2. Clarification: Only boiler manufacturers listed in the project specifications are approved for this project.

3. Clarification: Condensing units (CU-2 and CU-3) are to have lead modulating digital scroll compressors as indicated in the construction documents.

4. Clarification: Aaon is an approved manufacturer for Air Handling Units and Condensing Units.

5. Clarification: Only controls manufacturers listed in the project specifications are approved for this project.

6. Clarification: Contractor is to provide and install all required floor coverings needed throughout construction to preserve the condition of the flooring throughout the building during construction.

Contractor is responsible for replacement of damaged flooring.

7. Clarification: EPS is the fire alarm vendor for the building.

8. Clarification: MDOT will work with the awarded contractor to get card access to the building during onsite construction.

9. Clarification: Contractor is to coordinate with MDOT and MDOT Space Management for moving all large state-owned furniture (cubical, desks, tables, chairs, etc.) throughout the building as required to complete their work. Contractor to coordinate with MDOT and MDOT Space Management when furniture can be re-installed when work is completed in areas of the building.

10. Clarification: Contractor is to cover and protect all work stations and furniture not moved with visqueen or other protective measures throughout construction.

11. Clarification: On drawing E-100 (drawing not re-issued) for Fixture Schedule Note 1.1, if the contractor’s bid includes fixtures other than the Lithonia fixtures specified, the lighting and controls package should include the replacement of (8) 2x2 fixtures, (1) occupancy sensor, and (2) switches.

Existing layout and components are shown on construction drawings.

12. Clarification: Concrete pads are to be removed and installed as indicated in the construction docuements.

13. Clarification: Access panels for access to VAV boxes are not needed in areas of lay-in ceiling.

http://www.michigan.gov/SIGMAVSS

14. Clarification: Drawings M-802 & M-803 (not re-issued) indicate the spaces in the building that are sprinkled. Contractor is to modify existing sprinkler piping and sprinkler head locations as required to accommodate new lay-in ceilings/hard-lid ceiling patching, lighting and HVAC layout. All modifications are to be completed by a certified fire suppression contractor. All modifications must be submitted to the AHJ for review and approval and sprinkle the spaces per NFPA 13.

ACKNOWLEDGEMENT: This Addendum must be acknowledged by the Bidder in the space provided in the Bid Summary and Bid Form. Failing to acknowledge Addenda may be cause for the Bid to be rejected. Addenda will become part of the Contract Documents.

PROFESSIONAL: Devon Pung, Matrix DATE: 10/22/2026

APPROVED BY: Josiah Meyers PROJECT DIRECTOR: Josiah Meyers

DATE: 10/22/2026

State of Michigan Project No. 22513.00

Department of Technology, Management and Budget October 2026

Design and Construction Division

Department of Transportation

File/No: 591/22395.JLM

MDOT Southwest Region Office - Replace HVAC System

CONVECTORS 238233 - 1

SECTION 238233 - CONVECTORS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

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

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

1.2 SUMMARY

A. This Section includes the following:

1. Hydronic finned-tube radiators.

1.3 SUBMITTALS

A. Product Data: Include rated capacities, operating characteristics, furnished specialties, and accessories for each type of product indicated.

B. Shop Drawings: Detail equipment assemblies and indicate dimensions, weights, loads, required clearances, method of field assembly, components, and location and size of each field connection.

1. Plans, elevations, sections, and details.

2. Details of custom-fabricated enclosures indicating dimensions.

3. Location and size of each field connection.

4. Location and arrangement of piping valves and specialties.

5. Location and arrangement of integral controls.

6. Enclosure joints, corner pieces, access doors, and other accessories.

7. Wiring Diagrams: Power, signal, and control wiring.

C. Color Samples for Initial Selection: For units with factory-applied color finishes.

D. Field quality-control test reports.

E. Operation and Maintenance Data: For convection heating units to include in emergency, operation, and maintenance manuals.

Design and Construction Division

Department of Transportation

CONVECTORS 238233 - 2

1.4 QUALITY ASSURANCE

A. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use.

PART 2 - PRODUCTS

2.1 HOT-WATER FINNED-TUBE RADIATORS

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

1. Embassy Industries, Inc.

2. Engineered Air.

3. Rittling, a div. of Hydro-Air Components.

4. Rosemex.

5. Slant/Fin.

6. Trane.

7. Vulcan.

8. Sterling

B. Performance Ratings: Rate finned-tube radiators according to Hydronics Institute's "I=B=R

Testing and Rating Standard for Finned-Tube (Commercial) Radiation."

C. Heating Elements: Copper tubing mechanically expanded into flanged collars of evenly spaced aluminum fins resting on element supports. One tube end shall be belled.

D. Element Supports: Ball-bearing cradle type to permit longitudinal movement on enclosure brackets.

E. Front Panel: Minimum 0.0428-inch- thick steel.

F. Rust-Resistant Front Panel: Minimum 0.052-inch- thick, ASTM A 653/A 653M, G60 galvanized steel.

G. Wall-Mounting Back Panel: Minimum 0.0329-inch- thick steel, full height, with full-length channel support for front panel without exposed fasteners.

H. Support Brackets: Locate at maximum 36-inch spacing to support front panel and element.

I. Finish: Baked-enamel finish in manufacturer's standard color as selected by Architect.

J. Access Doors: Factory made, permanently hinged with tamper-resistant fastener, minimum size

6 by 7 inches, integral with enclosure.

Design and Construction Division

Department of Transportation

CONVECTORS 238233 - 3

K. Enclosure Style: Refer to drawings.

L. Accessories: Filler sections, corners, relay sections, and splice plates all matching the enclosure and grille finishes.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine areas to receive convection heating units for compliance with requirements for installation tolerances and other conditions affecting performance.

B. Examine roughing-in for hydronic-piping connections to verify actual locations before convection heating unit installation.

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

3.2 FINNED-TUBE RADIATOR INSTALLATION

A. Install units level and plumb.

B. Install finned-tube radiators according to Guide 2000 - Residential Hydronic Heating.

C. Install enclosure continuously around corners, using outside and inside corner fittings.

D. Join sections with splice plates and filler pieces to provide continuous enclosure.

E. Install access doors for access to valves.

F. Install enclosure continuously from wall to wall.

G. Terminate enclosures with manufacturer's end caps, except where enclosures are indicated to extend to adjoining walls.

H. Install valves within reach of access door provided in enclosure.

I. Install air-seal gasket between wall and recessing flanges or front cover of fully recessed unit.

J. Install piping within pedestals for freestanding units.

3.3 CONNECTIONS

A. Piping installation requirements are specified in Division 23 Section "Hydronic Piping."

Drawings indicate general arrangement of piping, fittings, and specialties.

Design and Construction Division

Department of Transportation

CONVECTORS 238233 - 4

B. Connect hot-water units and components to piping according to Division 23 Section "Hydronic

Piping."

1. Install shutoff valves on inlet and outlet, and balancing valve on outlet.

C. Install control valves as required by Division 23 Section "Instrumentation and Control for

HVAC."

D. Install piping adjacent to convection heating units to allow service and maintenance.

3.4 FIELD QUALITY CONTROL

A. Perform the following field tests and inspections and prepare test reports:

1. Leak Test: After installation, charge system and test for leaks. Repair leaks and retest until no leaks exist.

2. Operational Test: After electrical circuitry has been energized, start units to confirm proper convection heating unit operation.

3. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment.

B. Remove and replace convection heating units that do not pass tests and inspections and retest as specified above.

END OF SECTION 238233