A04_SOW.docx

Statement of Work for Testing, Adjusting and Balancing AHU-1 at the Gateway Arch National Park

Prepared by Lance Ott 08/22/2024

Table of Contents

AHU-1 Trane Balance Repair

1.0 Project Description / Summary:

This project will service AHU-1 by testing, adjusting, and balancing the unit, as well as the VAV terminals which controls the climate in Gateway Arch National Park Grounds Building.

2.0 Objectives:

The National Park Service is looking for a qualified, licensed, bonded, and certified member of the AABC or the NEBB contractor to perform the tasks required in section 5.0 to complete this project in a timely manner.

3.0 Background:

The Trane AHU was installed in the Gateway Arch National Park grounds building in 2021. The Arch is currently open to the public and AHU-1 is necessary to ensure the health and comfort of the employees at the park.

4.0 Specific Work / Tasks: Testing, adjusting, and balancing AHU-1

4.1 Balancing

a. Data to be read and recorded:

1. Data read and recorded shall include, but not be limited to the following:

A. Air Balance at the Fans:

1) Read all fan systems: Supply, exhaust, return, fume hoods, unit heaters, packaged units, cooling towers, etc. Set all systems so that repeatability error is less than 5% of design. Do not change design without written approval from the Prime Consultant and the WSU Project Manager.

2) Record all design fan data listed in drawings, specifications, and submittals (i.e., fan number, CFM, static pressure, O.D. sheave size, shaft diameter, RPM. expected BHP, class, manufacturer & unit size).

3) Record all design motor data (i.e., motor HP, voltage, phase, full load amperage, BHP, frame size, heater size, O.D. sheave size, shaft diameter, RPM).

4) Record all actual fan & motor data (i.e., CFM, fan RPM, BHP, Z, static pressure, motor movement, amperage, center to center of shafts, size & number of belts).

5) Record pressure drop across each coil or filter and total system pressure. Record temperatures (return, mixed, inlet & outlet).

6) Perform a velocity test for total CFM.

7) Balancing contractor shall make vibration and acoustic readings only if required by design specifications. If in the professional judgment of the Balancing Contractor acoustic and vibration readings are required, a change proposal shall be submitted to the owner.

B. Air Balance Branch Ducts, Boxes and Outlets:

1) Record zone, branch, mixing box number and outlet number for each grille, register or diffuser, outlet size, free area Ak factor and required velocity to reach design.

2) Record design CFM for each outlet and actual CFM. Adjust dampers and repeat until design CFM has been obtained.

3) Install test ports and perform a velocity test on major branches or where required.

4) Check calibration and operation of all thermostats.

5) Check position of all manual dampers and fire dampers and the operation of all automatic dampers. Make sure "open" and "closed" positions are clearly marked on quadrant. Mark damper position at design setting.

6) Check operation and tightness of outside air dampers, leakage of more than 5% must be corrected by the Contractor. Check and set percentage of outside air required.

C. Water Balance at Pump, equipment on all Water Systems:

1) Record equipment name and assigned number, manufacturer’s name and model number, size, impeller and the system or service.

2) Record the design and actual test data for the following: GPM, head (in ft.), discharge pressure, suction pressure, operating pressure, EWT, LWT, HP, RPM, amps, volts, BHP, & heater size. Record EAT, LAT, sheaves, belts and shaft sizes if applicable.

D. Water Balance at Box, Convector or Coil:

1) Record room number, device number (box or coil), design BTU, the design and actual GPM, pressure drop, and balancing valve size or Venturi Number.

E. Damage, Test and Final Setting:

1) The balancing firm shall avoid damage to paint and finishes. Where damage is inevitable to gain access to dampers, valves, or other devices, the General Contractor shall be given prior notice so that appropriate corrections can be made, and proper accessibility can be provided.

2) Location of all devices placed within ceiling spaces or hidden from view shall be marked by a color-coded identifier pin.

3) All final settings shall be clearly marked on each balancing valve, damper, quadrant, etc., with a center punch upon final completion of the balancing work.

4.2 FINALIZATION

a. Installation deficiencies found by the balancers shall be immediately reported to the General Contractor, Commissioning Agent, and WSU Construction Manager to allow corrective action to be taken by Contractor.

5.0 Conditions / Requirements:

a. Site visit to review existing conditions, confirm scope and develop installation plans with sequence of work.

b. The Balancing Contractor shall guarantee the accuracy and compliance of its material and labor according to the Associated Air Balance Council (AABC) or the National Environmental Balancing Bureau (NEBB).

c. The Balancing Contractor shall be a certified member of the AABC or the NEBB. Balancing Contractor and balancing personnel shall provide proof of having completed at least five projects of similar size and scope.

d. Testing and balancing shall be done under the direct supervision of a certified Test and Balance Engineer or a registered Professional Engineer.

e. The Contractor shall examine and verify the following prior to Testing and Balancing activities:

f. Air Side:

1. Ductwork is intact and properly sealed.

2. Ductwork has been leak tested and repaired as required.

3. Access doors are installed and properly secured.

4. Ductwork end caps are installed.

5. Ductwork installed according to drawings and specifications.

6. Ductwork is free of debris.

7. All dampers, fire, volume, mixing, splitters are installed, accessible and open.

8. All terminal boxes, reheat coils, operators and dampers are installed, accessible and operable.

9. Return air has unobstructed path from each conditioned space back to the unit.

10. All grilles, registers, diffusers and other devices are installed and functional.

11. Filters are clean and correctly installed.

12. Filter frames correctly installed and sealed.

13. Coils clean, properly installed, combed.

14. Drive components installed.

15. Sheaves properly aligned & tight on their shaft.

16. Belts adjusted for correct tension.

17. Belt guard properly installed.

18. Automatic control dampers installed and functional.

19. Fan rotation correct.

20. Fan housing installed and sealed.

21. All flex connections and vibration isolators are installed correctly.

22. Fan wheel aligned with adequate clearance.

23. Fan bearings lubricated.

g. Water Side:

a. All valves, flow meters, temperature/pressure taps installed correctly, functional, and accessible.

b. Strainers & piping, clean, flushed, and free of debris.

c. Construction strainer baskets replaced with permanent baskets.

d. System filled to proper level & pressure reducing valve set.

e. Automatic & manual air vents properly installed & functional.

f. All air purged from system.

g. Water in expansion tanks at proper level.

h. All coils piped correctly and accessible.

i. Correct pump rotation.

j. Pumps properly aligned, grouted, and anchored.

k. Vibration isolators properly installed & adjusted.

l. Service & balance valves are open.

h. Electrical:

1. Motors are wired and energized.

2. Proper starter and overload protection are installed.

3. Correct fuses are installed.

4. Motor is secured to frame.

5. Motor bearings are lubricated.

i. Controls:

1. Controls are complete and functional.

2. Thermostats are calibrated.

3. Program is correct and functional.

j. All work including work practices is subject to inspection and approval by the Contracting Officer Representative (COR) or park representative. Work or work practices are subject to inspection by regulatory personnel.

k. Contractor shall be responsible to repair any utilities, equipment supports, piping, conduits or wiring damaged during contract activities/construction and shall make all necessary repairs at Contractor expense.

6.0 Place of Performance:

a. Gateway Arch National Park 201 Poplar Street, St Louis, Missouri 63102-1880

7.0 Performance Period / Schedule Requirements:

a. All work must be completed within 30 days of notice to proceed.

b. Work hours will be scheduled between 6:00 a.m. and 3:30 p.m. Monday through Friday. No Weekends or Federal Holidays.

8.0 Warranty:

a. Contractor shall warrant all material and installation workmanship for up to one year against any pinhole corrosion or defects.

9.0 Attachments: Below: Photos of AHU-1 Trane Data Plate

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