SOW LF18 and CEP200 AHU Replacements.pdf

STATEMENT OF WORK

TITLE: CLIMATE PERFORMANCE CHANGER (AIR HANDLER UNIT - AHU) REPLACEMENT(S)

PERIOD OF PERFORMANCE: 09/30/2022-03/29/2023

PLACE OF PERFORMANCE: 1) Naval Station Norfolk 2) Naval Station Norfolk 9727 Avionics Loop Building CEP-200 Norfolk, VA. 23511 9170 2nd Street BLDG. LF-18 Norfolk, VA. 23511

DESCRIPTION OF WORK (Place of Performance #1, LF-18, 1 AHU):

As part of the Building LF-18 Heating, Ventilation, and Air Conditioning (HVAC) Sustainment Plan - MARMC Facilities has a requirement for replacement of a Climate Performance Changer (Air Handler Unit – AHU) that is no longer within the service life expectancy, no factory support, parts are no longer available and the best estimated age of the existing AHU is 30 plus years. Combined with the unit’s age, lack of factory support and parts availability creates a vulnerability for failure in the habitability for employees of Building LF-18.

A. Remove and dispose of existing Air Handling Unit (AHU) located approximately 20 feet in the overhead above the Transportation office.

1. Contractor shall be responsible for disconnecting and isolating electrical, mechanical and plumbing associated with AHUs removal. Contractor shall utilize proper OSHA Log Out/Tag Out procedures.

2. Contractor shall remove and reinstall drop ceiling as required to include the removal / re-installation of lighting.

Replace damaged and/or stained ceiling tiles with new tiles as required.

3. Contractor shall provide for the removal of asbestos containing material as required in accordance with all applicable local, state and federal regulations governing the removal and abatement of asbestos containing materials. Contractor shall provide all OSHA required personal air monitoring, third party project monitoring, and disposal at an EPA and State approved landfill. Contractor shall provide all OSHA required documents pertaining to the removal of asbestos.

NOTE: Asbestos removal pending test results provided by NAVFAC Asbestos Program Office

B. Procure, deliver and install a new AHU consistent with existing unit and/or a unit that provides the optimum BTUs for approximately 3000 square feet to include office space on first and second floor.

1. Existing Transportation AHU Information

a. Model #: / Manufacturer – Unknown

b. Serial #: Unknown

c. Size – Unknown NOTE: No known marking or technical data plates found on existing unit

2. Install new AHU in same location and/or close proximity as the old AHU approximately 20ft. in the overhead.

3. Provide and install multi-zone thermostats and/or zone sensors and place in the optimum location for unit efficiency.

4. Provide all electrical, mechanical and plumbing connections to the newly installed AHU.

a. Provide and install replacement chill water and steam shut-off valves at the unit.

b. Reconfigure and/or rework the chill water and steam piping for proper connections at the unit as required.

5. Reconfigure and/or rework supply and return ducting as required.

6. Replace and install old flex duct lines from unit to each supply diffuser as required.

7. Provide removal and installation of Smoke Detector. Fire Panel Interface shall be disabled before removal of old

AHU and enabled when installation is complete for the new AHU.

8. Provide initial start-up and operational checks to new unit in accordance with manufactures specifications.

C. Provide new data controls that will connect the new AHU to the Trane Tracer SC Building Automation System (BAS) including materials, engineering, installation, and start-up to include:

1. Integration to the existing Trane System (Tracer SC) and Building Control Unit (BCU) with Local Ethernet and Local Network-Accessibility as required

2. Modification of existing custom building graphics

3. Programming and Software Set-up by authorized and certified Trane Controls Technician

4. Conduct test for functionality to ensure controls are properly communicating to the unit and BAS components

5. Provide “As Built” Control Schematics and Wiring Diagrams

6. Provide Warranty – Minimum One (1) Year Labor and Materials

NOTE: Data Control Unit must be “back network” capable

D. Provide and install maintenance platform and/or catwalks around the AHU with safety railings to include access ladder from ground level. Platform and ladder shall be structurally engineered to meet all local, state and federal building codes. Provide engineered design plans for platform and ladder.

E. Contractor shall provide and submit for review and approval with the MARMC Safety Department a Job Safety Analysis, which shall detail all safety precautions and procedures required for the removal and installation of the AHU to include an approved crane/rigging plan by a certified crane rigging company.

F. Contractor shall coordinate with the NAVFAC Fire Protection Sprinkler shop as required for impacts to the sprinkler system.

NOTE: NAVFAC Fire Protection Sprinkler shop has oversight and overall approval for securing and/or sprinkler removal.

NOTE: Contractor to confirm that dimensions and specifications of proposed AHU are acceptable with customer

NOTE: All work to be performed during normal working hours Monday-Friday 7:00am – 3:30pm

NOTE: Requires Norfolk Naval Base Access and MARMC Buildings LF-18. (Allow 21 working days for Naval Station Norfolk access via the DBIDS process)

DESCRIPTION OF WORK (Place of Performance #2, CEP-200, 2 AHUs, AHU #6 and #8):

As part of Building CEP-200 Heating, Ventilation, and Air Conditioning (HVAC) Sustainment Plan - MARMC Facilities has a requirement for the replacement of two Climate Performance Changers (Air Handler Units – AHU #6 and #8) that are no longer within the service life expectancy, no factory support, parts are no longer available and the best estimated age of the existing AHU is 40 years. Combined with the unit’s age, lack of factory support and parts availability creates a vulnerability for failure in the habitability for employees of Building CEP-200.

A. Remove and dispose of existing Air Handling Units (AHU) located approximately 15 feet in the overhead in rooms 146A (AHU #6) and room 161 (AHU #8)

1. Contractor shall be responsible for disconnecting and isolating electrical, mechanical and plumbing associated with AHUs removal. Contractor shall utilize proper OSHA Log Out/Tag Out procedures.

2. Contractor shall remove and reinstall drop ceiling as required to include the removal / re-installation of lighting.

Replace damaged and/or stained ceiling tiles with new tiles as required.

3. Contractor shall provide for the removal of asbestos containing material as required in accordance with all applicable local, state and federal regulations governing the removal and abatement of asbestos containing materials. Contractor shall provide all OSHA required personal air monitoring, third party project monitoring, and disposal at an EPA and State approved landfill. Contractor shall provide all OSHA required documents pertaining to the removal of asbestos.

NOTE: Asbestos removal pending test results provided by NAVFAC Asbestos Program Office

B. Procure, deliver and install two new AHUs consistent with existing units or units that provides the required BTUs per space square footage.

1. Existing AHU Information

d. Model #: / Manufacturer – Unknown

e. Serial #: Unknown

f. Size – Refer to attached NAVFAC AHU Schedule

2. Install new AHUs in same location and/or close proximity as the old AHU approximately 15ft. in the overhead.

3. Contractor shall install new AHU in accordance with the manufacturers written instructions

4. AHU Set-Up and sequence of operation:

a. Units shall run in constant volume mode. If unit comes with VFD’s, soft start recommended

b. Units shall be energized by a wall thermostat. Thermostat shall be 7-day programmable with temperature and humidity sensors and display. When energized the supply fan and exhaust fan soft start and the coil valves modulated to maintain space temperature and humidity at the set points.

c. When temperature rises above the set point, the chilled water valve modulates open to maintain supply air temperature at 55 degrees. When temperature decreases below the cooling set point, the CW valve modulates shut.

d. As temperature continues to fall below the heating set point, the hot water heating valve modulates open to maintain supply temperature at 100 degrees. As temperature rises above the set point, the valve modulates shut.

e. If temperature is satisfied, but humidity is above 55% the chilled water valve opens 100% while the hot water valve modulates open to maintain space temperature above the heating set point. As relative humidity falls below 50% the opposite occurs NOTE: The old unit has pneumatic controls. Contractor to provide a Digital Data Controller (DDC) with Automated Logic, to implement the above sequence of operation.

5. Provide and install wall thermostats place in the optimum location for unit efficiency.

6. Provide all electrical, mechanical and plumbing connections to the newly installed AHUs.

a. Provide new coil valves with electronic actuators.

b. Provide and install replacement chill water and steam shut-off valves at the unit.

c. Reconfigure and/or rework the chill water and steam piping for proper connections at the unit as required.

7. Reconfigure and/or rework supply and return ducting as required.

8. Replace old flex duct lines and install new flex ducting from unit to each supply diffuser as required.

9. Provide removal and installation of Smoke Detector. Fire Panel Interface shall be disabled before removal of old AHU and enabled when installation is complete for the new AHU. Coordinate with NAVFAC Fire Protection services as required to minimize impacts to the Fire Alarm Panel.

10. Provide initial start-up and operational checks to new unit in accordance with manufactures specifications.

11. Provide Testing, Adjusting and Balancing (TAB) to each Unit for optimum performance

C. Provide new BACnet Digital Data Controller (DDC) per AHU.

1. Program DDC to above AHU sequence of operation

2. Conduct test for functionality to ensure controls are properly communicating to the unit

3. Provide Warranty – Minimum One (1) Year Labor and Materials

NOTE: DDC Unit must be “BACnet” capable

D. Provide and install maintenance platform and/or catwalks around the AHUs with safety railings to include access ladder from ground level. Platform and ladder shall be engineered to meet all local, state and federal building codes.

Provide engineered design schematic plans for platform and ladder.

E. Contractor shall provide and submit for review and approval with the MARMC Safety Department a Job Safety Analysis, which shall detail all safety precautions and procedures required for the removal and installation of the AHU to include an approved crane/rigging plan by a certified crane rigging company.

F. Contractor shall coordinate with the NAVFAC Fire Protection Sprinkler shop as required for impacts to the sprinkler system.

NOTE: NAVFAC Fire Protection Sprinkler shop has oversight and overall approval for securing and/or sprinkler removal.

NOTE: Contractor to confirm that dimensions and specifications of proposed AHU are acceptable with customer

NOTE: All work to be performed during normal working hours Monday-Friday 7:00am – 3:30pm

NOTE: Requires Norfolk Naval Base Access and MARMC Buildings LF-18. (Allow 21 working days for Naval Station Norfolk access via the DBIDS process)