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DocuSign Envelope ID: B94F2D40-3B3C-47A7-86C2-6F1 B4F92C62C <br /> Orange County Emergency Services Building Construction Documents <br /> 4. Final filters are clean and in place. If required, install temporary media in addition to final <br /> filters. <br /> 5. Duct systems are clean of debris. <br /> 6. Fans are rotating correctly. <br /> 7. Fire and volume dampers are in place and open. <br /> 8. Air coil fins are cleaned and combed. <br /> 9. Access doors are closed and duct end caps are in place. <br /> 10. Air outlets are installed and connected. <br /> 11. Duct system leakage is minimized. <br /> B. Submit field reports. Report defects and deficiencies that will or could prevent proper system <br /> balance. <br /> C. Beginning of work means acceptance of existing conditions. <br /> 3.03 PREPARATION <br /> A. Hold a pre-balancing meeting at least one week prior to starting TAB work. <br /> 1. Require attendance by all installers whose work will be tested, adjusted, or balanced. <br /> B. Obtain design drawings and specifications and become thoroughly acquainted with the design <br /> intent. <br /> C. Obtain copies of approved shop drawings of all air handling equipment, outlets (supply, return, and <br /> exhaust) and temperature control diagrams. <br /> D. Compare design to installed equipment and field installations. <br /> E. Walk the system to determine variations of installation from design. <br /> F. Check filters for cleanliness. <br /> G. Lubricate all motors and bearings. <br /> 3.04 ADJUSTMENT TOLERANCES <br /> A. Air Handling Systems: Adjust to within plus or minus 5 percent of design for supply systems and <br /> plus or minus 5 percent of design for return and exhaust systems. <br /> B. Air Outlets and Inlets: Adjust total to within plus 10 percent and minus 5 percent of design to <br /> space. Adjust outlets and inlets in space to within plus or minus 5 percent of design. <br /> 3.05 RECORDING AND ADJUSTING <br /> A. Field Logs: Maintain written logs including: <br /> 1. Running log of events and issues. <br /> 2. Discrepancies, deficient or uncompleted work by others. <br /> 3. Contract interpretation requests. <br /> 4. Lists of completed tests. <br /> B. Ensure recorded data represents actual measured or observed conditions. <br /> C. Use only those instruments which have the maximum field measuring accuracy and are best suited <br /> to the function being measured. <br /> D. Apply instrument as recommended by the manufacturer. <br /> E. When averaging values, take a sufficient quantity of readings that will result in a repeatability error <br /> of less than 5 percent. When measuring a single point, repeat readings until 2 consecutive identical <br /> values are obtained. <br /> F. Permanently mark settings of valves, dampers, and other adjustment devices allowing settings to <br /> be restored. Set and lock memory stops. <br /> G. Mark on drawings the locations where traverse and other critical measurements were taken and <br /> cross reference the location in the final report. <br /> H. After adjustment, take measurements to verify balance has not been disrupted or that such <br /> disruption has been rectified. <br /> I. Leave systems in proper working order, replacing belt guards, closing access doors, closing doors <br /> to electrical switch boxes, and restoring thermostats to specified settings. <br /> J. Seal ducts and piping, and test for and repair leaks. <br /> PDC Project 18102 TESTING, ADJUSTING, AND 23 05 93- 3 <br /> 12/17/2018 BALANCING FOR HVAC <br />