Attch_1_NW_OR_DO_HVAC_System_Improvements_Scope_of_Work.pdf

NORTHWEST OREGON DISTRICT OFFICE

NORTHWEST OREGON DISTRICT

SALEM, OREGON

HVAC SYSTEM IMPROVEMENTS

CONTRACT SCOPE OF WORK

BUREAU OF LAND MANAGEMENT

Northwest Oregon District Office HVAC System Improvements Page 1 Contract Scope of Work

HVAC System Improvements Bureau of Land Management

I. Project Description

A. Project Purpose: The existing HVAC control system at the Northwest Oregon District Office is outdated and has reached the end of its useful service life. Comfort conditions have also been deteriorating in several areas of the building. Maintenance of the VAV terminal units above the ceiling on the second and third floors has been non-existent due to the requirement that portions of the decorative wood ceiling lattice must be removed to gain access to the VAV terminal units; the wood ceiling lattice sections are heavy and difficult to remove. This impacts energy efficiency, employee comfort, maintenance staff productivity, and control of indoor environmental conditions.

Recommendations were made in the SI CASHE report from the November 2013 inspection at the Northwest Oregon District Office to upgrade and modify the existing HVAC control system, rebalance, and recommission the existing HVAC systems to improve operation. This work will also reduce the overall energy consumption of the building, which will improve the sustainability of the facility and help it to meet the following Guiding Principles for Sustainable Federal Buildings:

1. GP II - Optimize Energy Performance; Energy Efficiency.

2. GP IV - Enhance Indoor Environmental Quality; Ventilation and Thermal Comfort, and Indoor Air Quality.

B. Project Work Elements: The work of this contract consists of:

1. Removal of the existing decorative wood ceiling lattice in the open office areas on the second and third floors to make the VAV boxes above the ceiling more easily accessible for regular maintenance and to brighten up the open office spaces.

2. Removal of the damaged existing suspended ceiling tiles and grid on the second and third floors.

3. Replacement of the existing Honeywell DDC HVAC control system with a new

Johnson Controls Metasys DDC HVAC control system, including replacement of existing reheat coil and heating coil control valves, control valve actuators, damper actuators, sensors. etc.

4. Development of graphics for the new control system.

5. Installation of isolation dampers for existing exhaust fans and other work incidental to upgrading the controls.

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6. Installation of additional VAV terminal units and associated ductwork for private office spaces that have been constructed since the building was built.

7. Bid Option A: Replacement of the existing roof-mounted condensing unit CU-1 and

CU-2.

8. Ductboard repair.

9. Installation of new suspended ceiling tiles in the open office areas on the second and third floors where existing tiles are already damaged or damaged as part of the project.

10. Replacement and painting of GWB where removed.

11. Testing, adjusting, and balancing the HVAC systems.

12. Commissioning the HVAC systems and the new HVAC control system.

13. Demonstration and training for BLM site personnel.

C. Project Contract Type: All work shall be performed under a single contract.

II. Project Location

A. The Northwest Oregon District Office is located at 1717 Fabry Road SE, Salem, OR 97306 (LAT 44.874386, LONG -123.023681). A pre-bid site inspection by potential bidders to verify existing conditions at the project site is highly recommended, but not mandatory.

III. Contractor’s Use of Premises

A. Business hours are 8 am to 4 pm Monday through Friday and is closed all federal holidays. Any work outside of these hours must be approved in advance by the Contracting Officer (CO) or Contracting Officer’s Representative (COR). No additional cost will be paid to the contractor for any overtime worked by the contractor or of any contractor's employees. All overtime shall be included in the contractor’s bid price for the item of work being performed.

B. Establishment of any sort of camp within the District Office property boundaries will not be permitted.

C. The office building will be occupied during construction. The Contractor shall conduct operations at all times to ensure the least inconvenience to the site staff and the public and shall coordinate all activities with the BLM site manager and the Contracting Officer’s Representative. A schedule outlining the areas, dates, and times that work will be performed shall be submitted to the COR before any work begins. Access to all areas shall be maintained for BLM administrative and other official business throughout the construction phase.

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D. Provide for the storage and delivery of all materials used under this contract. The Government shall not take liability for any material stored on Government property. The Government will not accept any deliveries on behalf of the contractor. The contractor and their employees may use the existing government parking areas to park company and personnel vehicles during the contractor working hours.

E. Confine storage of materials to within the area of the building being worked on or at exterior locations as designated by the BLM site manager and the Contracting Officer’s Representative.

F. Materials salvaged by the Contractor shall be removed from the District Office and shall be recycled or disposed of outside the District Office property boundaries.

G. Notify the COR at least 5 working days prior to start of work to arrange for building access.

IV. Existing Systems Description

A. General: The Northwest Oregon District Office is a 73,946 square foot, three story building, constructed in 1981.

B. Existing HVAC Systems: The existing HVAC systems consist of two high-efficiency condensing hot water boilers, two air handlers with DX cooling coils, two air-cooled condensing units, variable air volume airside (single-inlet VAV terminals), hot water reheat coils, and cabinet unit heaters in stairwells. A heating and ventilating air handler with hot water heating coil and hot water booster heating coils for each zone has been provided for the first floor (basement). Exhaust fans have been provided for the restrooms and various other spaces in the building and split-system air conditioners have been provided for the computer/telecom rooms.

The two existing 60 ton air-cooled condensing units are located on the roof of the building. These condensing units were installed in 2009 and contain R-22. The existing condensing units only have two steps of cooling capacity control, which makes it difficult to control discharge air temperature in a tight range as necessary for VAV operation.

C. Existing HVAC System Controls: The existing HVAC system controls consist of a Honeywell “SymmetrE” direct digital control (DDC) system that was installed in 2002.

V. Project Work Elements

A. Remove Existing Decorative Wood Ceiling Lattice: Remove most decorative wood ceiling lattice modules, hangers, and hanger rods in the open office areas on the second and third floors of the building as shown on Sheets A1 through A5 in Attachment A. The wood light troughs, lights within the linear wood construction that is separate from the lattice, and fire sprinkling drop heads located in the linear wood trough shall remain. It is strongly recommended that the wood ceiling lattice modules be reused rather that disposed of since they are made of nice straight clear vertical grain fir boards.

Consideration should be given to employing a firm specializing in reclaiming lumber to remove the decorative wood ceiling lattice modules and wood light troughs, such as

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Reclaim NW (aka Northwest Deconstruction Specialists), 7639 SE Foster Road, Portland, OR 97206, 503-779-3101, https://www.reclaimnw.com/.

B. Remove Existing Suspended Ceiling Tiles: Remove and dispose of damaged existing suspended ceiling tiles above the demolished decorative wood ceiling lattice in the open office areas on the second and third floors of the building as shown on Attachment C.

The existing suspended ceiling grid and existing tiles shall remain in place for reuse also except where damaged. Throughout the building are ceiling tiles where the facing material adhesive has failed and separated from the body of the tile. Some grid has rusted.

C. Remove Existing HVAC Control System: Remove and dispose of the existing Honeywell “SymmetrE” direct digital control (DDC) system – see Attachment D. Remove and dispose of all existing reheat coil and heating coil control valves, control valve actuators, damper actuators, room temperature sensors, duct temperature sensors, freezestats, duct pressure sensors, duct smoke detectors, supervisory controllers, field equipment controllers, VAV terminal damper controllers, and variable frequency drives.

D. Furnish and Install New HVAC Control System: Furnish and install a new Johnson Controls Metasys DDC HVAC control system. Subtasks under this work element shall include, but not be limited to the following:

1. Installation of a Supervisory Network Engine (SNE) for remote connection to the

BLM Metasys ADX server in Denver. The intent is to connect the Northwest Oregon District Office SNE supervisory controller to the existing BLM Metasys ADX server in Denver as soon as the Northwest Oregon District Office DDC system is operational.

2. Installation of Field Equipment Controllers (FECs) and Input-Output Modules (IOMs) as necessary for controlling the hot water heating system, air handling units, cabinet unit heaters, booster heating coils, exhaust fans, and the domestic water heating system.

3. VAV Box Controls Upgrade: VAV box controls require a complete upgrade. Boxes can be replaced as a whole unit (which is cleaner and preferred by BLM) or all control devices associated with the box can be replaced individually to accomplish the following:

a. Installation of VAV controller/actuators (VMAs) for controlling new and existing

VAV terminal units and reheat coils.

b. Installation of new reheat coil and heating coil control valves on all new and existing VAV terminal unit reheat coils.

4. Installation of new heating coil control valves on existing booster heating coils and AHU-3 heating coil.

5. Installation of new valve and damper actuators. Actuators shown with analog signals from the DDC system shall be fully modulating type - floating point actuators will not be allowed.

https://www.reclaimnw.com/

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6. Installation of all temperature sensors, carbon dioxide sensors, pressure sensors, airflow sensors, duct smoke detectors, current transformers, relays, etc. as shown on Sheets M3 through M5 in Attachment A and as necessary to implement the Proposed HVAC Control Sequence of Operation in Attachment B.

a. Sheets M3 through M5 include numerous keynotes requiring the relocation of existing temperature sensors to either different heights on the same wall or to different walls altogether.

b. Sheets M3 – M12 of Attachment A include notes for additional controls scope of work beyond direct replacement of existing.

7. Installation of room temperature sensors with limited setpoint adjustment capability and unoccupied bypass buttons.

8. Programming the new controls in accordance with the Proposed HVAC Control Sequence of Operation in Attachment B. Programming also includes configuring and programming the existing boiler controls in accordance with the boiler manufacturer’s instructions to execute the specified control sequence.

9. Performing point-to-point checkouts of all HVAC control system wiring. Verify that all control sensors and actuators are connected to the proper inputs and outputs on the DDC controllers and verify that all sensors and actuators are working properly.

10. Development of documentation (wiring schematic drawings) showing the detailed configuration of the new control system, along with documentation of point-to-point checkouts, programming, and operational testing.

E. Furnish and Develop Graphics for the New HVAC Control System: Graphic displays shall be provided for all HVAC equipment. At a minimum, the following graphics screens shall be provided:

1. Main Menu (Home) screen, with building title, building photograph, and menu buttons for accessing the following graphic display screens:

a. Floor Plan Screens (First Floor/Basement, Second Floor, Third Floor, and

Roof/Penthouse)

b. VAV Summary Screen (showing all the VAV terminal units and associated control points in a tabular matrix)

c. Booster Heating Coil Summary Screen (showing all the booster heating coils and associated control points in a tabular matrix)

d. Hot Water Heating System Screen (to match what is shown on Sheet M3 in Attachment A)

e. Domestic Hot Water System Screen (to match what is shown on Sheet M3 in

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f. Air Handling Unit Screens (to match what is shown on Sheets M4 and M5 in

g. Energy Monitoring Screens (to match what is shown on Sheet M5 in Attachment A)

2. Floor Plan Screens shall show floor plans of the building with locations shown for all

VAV terminal units, booster heating coils, boilers, domestic water heater, pumps, air handling units, condensing units, exhaust fans, cabinet unit heaters, and thermostats. Zone temperatures, CO2 levels, equipment status, and equipment alarms shall also be displayed on the floor plan screens.

3. Clicking on any of the individual equipment or thermostat icons on the Floor Plan Screens or on any of the rows in the Summary Screens shall open the associated individual system or equipment screen as follows:

a. VAV Terminal Unit Screens (to match what is shown on Sheet M4 in Attachment

A)

b. Booster Heating Coil Screens (to match what is shown on Sheet M5 in

c. Exhaust Fan Screens (to match what is shown on Sheets M4 and M5 in

d. Cabinet Unit Heater Screens (to match what is shown on Sheet M4 in

4. All graphic screens shall display the current time, date, and outdoor air temperature.

F. Furnish and Install New Isolation Dampers for Existing Exhaust Fans: Furnish and install new isolation dampers for EF-1, EF-2, EF-3, and EF-4 as shown on Sheets M6, M7, and M12 in Attachment A. See Key Notes on Sheets M6 – M12 for work incidental to the controls upgrade not otherwise stated in this SOW’s Project Work Elements.

G. Furnish and Install Additional VAV Terminal Units:

1. See New Variable Air Volume Terminal Unit Schedule on Sheet M2 of Attachment A.

2. TU-230: See keynotes 14, 15, and 16 on Sheet M8 of Attachment A for information on a new VAV box zone serving offices on the second floor along gridline 5 and approximately between gridlines A and B.

3. TU-231: See keynotes 6 and 7 on Sheet M9 of Attachment A for information on a new VAV box zone serving offices on the second floor along gridline 5 and on either side of gridline F.

4. TU-232: See keynotes 6, 8, and 9 on Sheet M9 of Attachment A for information on a new VAV box zone serving offices on the second floor whose corner is near the intersection of gridlines 2 and E.

5. TU-315: See keynotes 14 and 15 on Sheet M10 of Attachment A for information on a new VAV box zone serving offices on the third floor along gridline 5 and between gridlines C and D.

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H. Bid Option A: Replace Existing Roof-Mounted Condensing Units CU-1 and CU-2. For each condensing unit:

1. Demolish condensing unit and all associated refrigerant accessories both on the roof and at the air-handling unit.

2. Install condensing unit utilizing modern refrigerant with 36 stages of cooling capacity and install associated refrigerant accessories.

3. Pressure test existing and new refrigerant system. Repair leaks and put condensing unit in service interconnected with its air-handling unit.

4. See New Condensing Unit Schedule on sheet M2 of Attachment A.

I. Replace Damaged Suspended Ceiling Tiles: Match existing, original ceiling tile (Johns- Manville SpanAcoustic vinyl faced fiberglass acoustical panels) as best as possible with available product.

J. Perform Testing, Adjusting, and Balancing: The Northwest Oregon District Office HVAC systems shall be balanced by a qualified testing, adjusting, and balancing (TAB) firm.

1. TAB Qualifications: The TAB firm shall be certified by NEBB or AABC in testing and balancing disciplines required for this project, and with at least one Professional Engineer, certified by NEBB or AABC as a Test and Balance Engineer.

2. Air Side Balance: Air side balance quantities shall be as shown on the mechanical drawings in Attachment A. Please note the following:

• The existing volume dampers in the restroom areas have remote damper operators accessible under cover plates located on the ceiling.

• The ductwork downstream of the VAV terminal units is constructed with duct board and some of the duct board joints have failed. Repair as necessary with aluminum foil tape approved for use with duct board. Contractor shall include sealing ten (10) separated joints on low pressure ductwork on both the second and third floors for a total of twenty (20) locations. Record locations of repaired ductwork with BLM COR.

The following air side systems shall be balanced unless noted otherwise:

a. All VAV terminal units and attached diffusers.

b. All booster heating coils and attached grilles.

c. Return air ductwork and inlets.

d. Exhaust air ductwork and inlets.

e. Air handling units and exhaust fans.

f. The telecom rooms are cooled with dedicated air conditioning systems; balancing of these systems is not included in the scope of this contract.

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3. Water Side Balance: Water side balance quantities shall be as shown on Sheet M1 in the attached Mechanical Drawings. The following systems shall be balanced unless noted otherwise:

a. All VAV terminal unit reheat coils.

b. All booster heating coils.

c. AHU-3 hot water heating coil.

d. Pumps P-1 through P-6.

e. Verify and adjust heating hot water loop expansion tank precharge pressure and system fill pressure.

4. TAB Report: Prepare and submit a testing, adjusting, and balancing (TAB) report upon completion of TAB work.

K. Commission HVAC Systems and Control System: The Northwest Oregon District Office HVAC systems and HVAC control system shall be commissioned to verify that everything is functioning in accordance with the design intent and the Proposed HVAC Control Sequence of Operation in Attachment B.

1. Commission the HVAC and controls systems per ASHRAE 90.1-2019 paragraph

4.2.5.2 Building Commissioning Requirements.

2. Standards and Guidelines: The commissioning work outlined in this task order shall generally conform to the following standards and guidelines:

a. ASHRAE Guideline 0-2019, “The Commissioning Process”

b. ASHRAE Guideline 1.1-2007, “HVAC&R Technical Requirements for the

Commissioning Process”

c. ASHRAE Standard 202-2018 “Commissioning Process for Buildings and Systems”

3. CxA Qualifications: The Commissioning Authority (CxA) shall provide the engineering personnel required to commission this project, with at least one registered professional engineer on staff.

4. Systems to be Commissioned:

a. Air handling units

b. Heating hot water (boiler) system, including VAV reheat coils and AHU-3 booster coils.

c. Refrigerant/condensing unit systems

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d. VAV terminal units

e. Electric cabinet unit heaters

f. Unit heaters

g. Exhaust fans

h. Economizer dampers

i. DDC BAS system

5. Commissioning: The Contractor shall provide the CxA who shall be responsible for performing the following tasks and providing the following deliverables:

a. Commissioning Plan: The CxA shall prepare and submit a draft commissioning plan for Government review, resubmit a corrected final version prior to commencing commissioning work.

b. Pre-Functional Inspections: The CxA shall perform pre-functional inspections to determine whether all systems and equipment being commissioned have been installed and configured properly.

c. Testing, Adjusting, and Balancing (TAB) Oversight: The CxA shall provide oversight and shall witness approximately 10% of the balancing work of the TAB subcontractor. Testing and balancing shall be substantially complete prior to functional performance testing, especially where unbalanced conditions would affect the results of the functional performance tests.

d. Functional Performance Testing (Performance Verification) – The CxA shall perform functional performance testing of all systems and equipment being commissioned; all HVAC equipment in the building shall be tested for proper function in all operational modes. Performance tests shall be executed to simulate operation of the HVAC systems in all weather conditions (summer, intermediate, and winter weather seasons). If performance tests for all weather conditions cannot be satisfactorily simulated when the HVAC commissioning is initially performed, the CxA shall return to the jobsite during appropriate weather conditions to complete the performance testing as necessary. The CxA shall submit performance verification documentation at the end of functional performance testing, including records of deficiency resolution.

e. Deficiency Resolution – The CxA shall document any deficiencies found during pre-functional inspections and functional performance testing and shall document the adjustments and/or alterations required to correct the deficiencies. The CxA shall maintain a deficiency log used by the entire commissioning project team (contractor, engineer of record, and Government) during regular commissioning meetings to discuss issue resolution. Any deficiencies discovered during the commissioning process that are not easily corrected shall have a suggested

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f. Commissioning Report: The CxA shall prepare and submit a draft commissioning report, including a summary of the commissioning process, deficiency resolution history, performance verification documentation, and any outstanding issues to be addressed or any testing that may still be required. The Government will review the draft commissioning report and provide comments. A finalized commissioning report shall be submitted no later than one year from the end of the contract period if performance tests for all weather conditions cannot be satisfactorily simulated when the HVAC commissioning is initially performed.

L. Demonstration and Training: Provide at least 8 hours of training on HVAC system functions, control functions, and routine maintenance procedures. Training shall be given to BLM site personnel at a time that is acceptable to the BLM site manager. The CxA shall prepare and submit a training plan prior to commencing demonstration and training.

VI. Submittals

A. See Attachment F also for Submittals During Construction

B. Construction Submittals: Submittals shall be transmitted to the Contracting Officer for review and approval after contract award, but prior to commencing construction work.

1. Submit manufacturer’s product data for the following:

a. Replacement ceiling tiles.

2. Submit qualifications for TAB and CxA personnel who are going to perform the balancing and commissioning work.

3. Submit training plan.

4. Submit control system drawings for the HVAC control system.

C. Closeout Submittals: Submit operation and maintenance data to the Contracting Officer at project closeout.

1. Submit as-built control system drawings for the HVAC control system.

VII. Attachments

A. Contract Drawing Set

B. Proposed HVAC Control Sequence of Operation

C. Damaged Ceiling Tile and Grid Locations

D. Existing Control System Shop Drawings

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E. Original Building Drawings

F. D30 HVAC Performance Specifications

Additional information related to the original building construction and prior phases of HVAC improvement work (such as operation and maintenance manuals, shop drawings, test and balance report, and other construction documents) is available at the project site or is available upon request from the Contracting Officer’s Representative.

END

Attachment A – Contract Drawing Set

Sheet Sub

Sheet Title of Sheet

Architectural 1 G0 Cover Sheet 2 A1 Second Floor Ceiling Demolition Plan South 3 A2 Second Floor Ceiling Demolition Plan North 4 A3 Third Floor Ceiling Demolition Plan South 5 A4 Third Floor Ceiling Demolition Plan North 6 A5 Ceiling Demolition Details Mechanical 7 M1 HVAC Schedules A 8 M2 HVAC Schedules B 9 M3 Bid Option A & HVAC Control Schematics 10 M4 HVAC Control Schematics A 11 M5 HVAC Control Schematics B 12 M6 First Floor HVAC Plan South 13 M7 First Floor HVAC Plan North 14 M8 Second Floor HVAC Plan South 15 M9 Second Floor HVAC Plan North 16 M10 Third Floor HVAC Plan South 17 M11 Third Floor HVAC Plan North 18 M12 Penthouse + Roof HVAC Plans

Attachment B – Proposed HVAC Control Sequence of Operation

Attachment C - Damaged Ceiling Tile and Grid Locations

Attachment D - Existing Control System Shop Drawings

Attachment E – Original Salem Office Complex Drawings

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Attachment F – D30 HVAC Performance Specifications

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