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HomeMy WebLinkAbout230593 TESTING ADJUSTING AND BALANCINGTHE KENT 23 05 93 - 1 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT SECTION 23 05 93 - TESTING, ADJUSTING AND BALANCING PART 1 - GENERAL 1.01 RELATED SECTIONS: A. Drawings, general provisions of the Contract, including General and Supplementary Conditions, and Division-1 Specification Sections and Division 20 Specification Sections, apply to work of this Section. 1.02 WORK DESCRIPTION: A. Scope of Work: 1. Test, adjust, and balance the air moving equipment, and the air supply, return, and exhaust systems as herein specified. B. Work Included: 1. Adjust fans and volume dampers to deliver, return or exhaust design air quantities to or from each space. 2. Adjust terminal units to deliver design air quantities. 3. Adjust supply, return, exhaust, and relief dampers. 4. Adjust individual outlets for proper air movement. 5. Balance domestic water booster system. 6. Balance domestic hot water return loop. 1.03 DEFINITIONS: A. AABC: Associated Air Balance Council. B. NEBB: National Environmental Balancing Bureau. C. TAB: Testing, adjusting, and balancing. D. TABB: Testing, Adjusting, and Balancing Bureau. E. TAB Specialist: An entity engaged to perform TAB Work. 1.04 AGENCY LISTING: A. TAB Contractor Qualifications: Engage a TAB entity certified by AABC, NEBB or TABB. 1. TAB Field Supervisor: Employee of the TAB contractor and certified by AABC, NEBB or TABB. 2. TAB Technician: Employee of the TAB contractor and who is certified by AABC, NEBB or TABB as a TAB technician. THE KENT 23 05 93 - 2 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT B. Submit name of the Test and Balancing Agency to Architect/Engineer as a subcontractor on the Materials and Subcontractors Listing. C. If the Contractor fails to submit name of selected Test and Balance Agency, the Architect/Engineer will select the agency of his choice and Contractor shall then issue purchase order for this work as directed. 1.05 SUBMITTALS: A. Certified TAB reports. B. Instrument calibration reports, to include the following: 1. Instrument type and make. 2. Serial number. 3. Application. 4. Dates of use. 5. Dates of calibration. 1.06 INSTRUMENTS: A. Quality: 1. The minimum instrumentation for testing, adjusting, and balancing shall be the "AABC Approved Minimum Field Instrumentation." 2. Instruments used for testing and balancing must have been calibrated within a period of six (6) months and checked for accuracy prior to start of work. 3. Instruments must be maintained and carried in such manner to protect them from excessive vibration and moisture conditions. B. Approval: 1. All products and instrumentation used shall be subject to approval of the Architect/Engineer. 1.07 PROJECT CONDITIONS: A. Partial Owner Occupancy: Owner may occupy completed areas of building during TAB period. Cooperate with Owner during TAB operations to minimize conflicts with Owner's operations. B. System Operation: 1. Heating, ventilating, air conditioning equipment shall be completely installed and in continuous operation as required to accomplish the adjusting and balancing work specified. THE KENT 23 05 93 - 3 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT PART 2 - PRODUCTS (Not Applicable) PART 3 - EXECUTION 3.01 EXAMINATION: A. Examine the Contract Documents to become familiar with Project requirements and to discover conditions in systems' designs that may preclude proper TAB of systems and equipment. B. Examine systems for installed balancing devices, such as test ports, gage cocks, thermometer wells, flow-control devices, balancing valves and fittings, and manual volume dampers. Verify that locations of these balancing devices are accessible. C. Examine the approved submittals for HVAC systems and equipment. D. Examine equipment performance data including fan and pump curves. 1. Relate performance data to Project conditions and requirements, including system effects that can create undesired or unpredicted conditions that cause reduced capacities in all or part of a system. 2. Calculate system-effect factors to reduce performance ratings of HVAC equipment when installed under conditions different from the conditions used to rate equipment performance. To calculate system effects for air systems, use tables and charts found in AMCA 201, "Fans and Systems," or in SMACNA's "HVAC Systems - Duct Design." Compare results with the design data and installed conditions. E. Examine system and equipment installations and verify that field quality-control testing, cleaning, and adjusting specified in individual Sections have been performed. F. Examine test reports specified in individual system and equipment Sections. G. Examine HVAC equipment and filters and verify that bearings are greased, belts are aligned and tight, and equipment with functioning controls is ready for operation. H. Examine fan coil units, and verify that they are accessible and their controls are connected and functioning. I. Examine strainers. Verify that startup screens are replaced by permanent screens with indicated perforations. J. Examine three-way valves for proper installation for their intended function of diverting or mixing fluid flows. K. Examine heat-transfer coils for correct piping connections and for clean and straight fins. L. Examine system pumps to ensure absence of entrained air in the suction piping. M. Examine operating safety interlocks and controls on HVAC equipment. THE KENT 23 05 93 - 4 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT N. Report deficiencies discovered before and during performance of TAB procedures. Observe and record system reactions to changes in conditions. Record default set points if different from indicated values. 3.02 PREPARATION: A. Prepare a TAB plan that includes strategies and step-by-step procedures. B. Complete system-readiness checks and prepare reports. Verify the following: 1. Permanent electrical-power wiring is complete. 2. Plumbing systems are filled, clean, and free of air. 3. Automatic temperature-control systems are operational. 4. Equipment and duct access doors are securely closed. 5. Balance and fire dampers are open. 6. Isolating and balancing valves are open and control valves are operational. 7. Ceilings are installed in critical areas where air-pattern adjustments are required and access to balancing devices is provided. 8. Windows and doors can be closed so indicated conditions for system operations can be met. 3.03 GENERAL PROCEDURES FOR TESTING AND BALANCING: A. Perform testing and balancing procedures on each system according to the procedures contained in AABC's "National Standards for Total System Balance", ASHRAE 111, NEBB's "Procedural Standards for Testing, Adjusting, and Balancing of Environmental Systems", SMACNA's "HVAC Systems - Testing, Adjusting, and Balancing" and in this Section. 1. Comply with requirements in ASHRAE 62.1-2010, Section 7.2.2, "Air Balancing." B. Cut insulation, ducts, pipes, and equipment cabinets for installation of test probes to the minimum extent necessary for TAB procedures. 1. After testing and balancing, patch probe holes in ducts with same material and thickness as used to construct ducts. 2. After testing and balancing, install test ports and duct access doors that comply with requirements in Division 23 Section "Air Duct Accessories." 3. Install and join new insulation that matches removed materials. Restore insulation, coverings, vapor barrier, and finish according to Division 20 Section "HVAC Insulation." C. Mark equipment and balancing devices, including damper-control positions, valve position indicators, fan-speed-control levers, and similar controls and devices, with paint or other suitable, permanent identification material to show final settings. D. Take and report testing and balancing measurements in inch-pound (IP) units. 3.04 GENERAL PROCEDURES FOR BALANCING AIR SYSTEMS: A. Prepare test reports for both fans and outlets. Obtain manufacturer's outlet factors and recommended testing procedures. Crosscheck the summation of required outlet volumes with required fan volumes. THE KENT 23 05 93 - 5 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT B. Prepare schematic diagrams of systems' "as-built" duct layouts. C. Determine the best locations in main and branch ducts for accurate duct-airflow measurements. D. Check airflow patterns from the outdoor-air louvers and dampers and the return- and exhaust- air dampers through the supply-fan discharge and mixing dampers. E. Locate start-stop and disconnect switches, electrical interlocks, and motor starters. F. Verify that motor starters are equipped with properly sized thermal protection. G. Check dampers for proper position to achieve desired airflow path. H. Check for airflow blockages. I. Check condensate drains for proper connections and functioning. J. Check for proper sealing of air-handling-unit components. K. Verify that air duct system is sealed as specified in Division 23 Section "Metal Ducts." L. Perform the following minimum test and balance: 1. Test and adjust supply, return, and exhaust fans to design requirements. Change sheaves and belts as required to obtain design air quantities. 2. Test and record motor electrical characteristics, RPM, service factor, measure voltage, full load amperes and connected load amperage. Check and record starter heaters sizes and rating, replacement belts sizes, etc. 3. Make pitot tube traverse (minimum of 16 point) of main supply ducts and obtain design CFM at fans. Seal all test holes with suitable hole plugs. 4. Test and record system static pressures, suction, and discharge. 5. Test and adjust system for design CFM recirculated air. 6. Test and adjust system for design CFM outside air. 7. Test and record entering air temperatures. (D.B. heating and cooling) 8. Test and record entering air temperatures. (W.B. cooling) 9. Test and record leaving air temperatures. (D.B. heating and cooling) 10. Test and record leaving air temperatures. (W.B. cooling) 11. Adjust all main supply and return air ducts to proper design CFM. 12. Adjust all zones to proper design CFM, supply, and return. 13. Test and adjust each diffuser, grilles, and register to within 10% of design requirements. 14. Each grille, diffuser, and register shall be identified as to location and area. Size, type, flow factor, and manufacturer of diffusers, grilles, registers, and all tested equipment shall be identified and listed. 15. Readings and tests of diffusers, grilles, and registers shall include required FPM velocity and test resultant velocity, requirement CFM and test resultant CFM after adjustments. THE KENT 23 05 93 - 6 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT 16. In cooperation with the Mechanical Contractor's representative, setting adjustments of automatically operated dampers to operate as specified, indicated, and/or noted. The Balance Agency shall check all controls for proper calibrations and list all controls required adjustment by the Mechanical Contractor. 17. All diffusers, grilles, and registers shall be adjusted to minimize drafts in all areas. 18. Adjust all pressure independent or maximum volume regulators, whether factory or field supplied, for scheduled air flow on all terminal boxes. 19. Adjust air directional vanes on air curtain discharge nozzles so that air split occurs approximately 12” above the floor, 3” outside the centerline of the doorway. Verify that air is directed to both the inside and outside of the doorway. Refer to manufacturer’s adjusting procedures. 3.05 PROCEDURES FOR CONSTANT-VOLUME AIR SYSTEMS: A. Adjust fans to deliver total indicated airflows within the maximum allowable fan speed listed by fan manufacturer. 1. Measure total airflow. a. Where sufficient space in ducts is unavailable for Pitot-tube traverse measurements, measure airflow at terminal outlets and inlets and calculate the total airflow. 2. Measure fan static pressures as follows to determine actual static pressure: a. Measure outlet static pressure as far downstream from the fan as practical and upstream from restrictions in ducts such as elbows and transitions. b. Measure static pressure directly at the fan outlet or through the flexible connection. c. Measure inlet static pressure of single-inlet fans in the inlet duct as near the fan as possible, upstream from the flexible connection, and downstream from duct restrictions. d. Measure inlet static pressure of double-inlet fans through the wall of the plenum that houses the fan. 3. Measure static pressure across each component that makes up an air-handling unit, rooftop unit, and other air-handling and -treating equipment. a. Report the cleanliness status of filters and the time static pressures are measured. 4. Measure static pressures entering and leaving other devices, such as sound traps, heat-recovery equipment, and air washers, under final balanced conditions. 5. Do not make fan-speed adjustments that result in motor overload. Consult equipment manufacturers about fan-speed safety factors. Modulate dampers and measure fan- motor amperage to ensure that no overload will occur. Measure amperage in full- cooling, full-heating, economizer, and any other operating mode to determine the maximum required brake horsepower. B. Adjust volume dampers for main duct, sub-main ducts, and major branch ducts to indicated airflows within specified tolerances. 1. Measure airflow of sub-main and branch ducts. a. Where sufficient space in sub-main and branch ducts is unavailable for Pitot- tube traverse measurements, measure airflow at terminal outlets and inlets and calculate the total airflow for that zone. 2. Measure static pressure at a point downstream from the balancing damper, and adjust THE KENT 23 05 93 - 7 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT volume dampers until the proper static pressure is achieved. 3. Re-measure each sub-main and branch duct after all have been adjusted. Continue to adjust sub-main and branch ducts to indicated airflows within specified tolerances. C. Measure air outlets and inlets without making adjustments. 1. Measure terminal outlets using a direct-reading hood or outlet manufacturer's written instructions and calculating factors. D. Adjust air outlets and inlets for each space to indicated airflows within specified tolerances of indicated values. Make adjustments using branch volume dampers rather than extractors and the dampers at air terminals. 1. Adjust each outlet in same room or space to within specified tolerances of indicated quantities without generating noise levels above the limitations prescribed by the Contract Documents. 2. Adjust patterns of adjustable outlets for proper distribution without drafts. 3.06 PROCEDURES FOR CONDENSING UNITS: A. Verify proper rotation of fans. B. Measure entering- and leaving-air temperatures. C. Record compressor data. 3.07 PROCEDURES FOR MOTORS: A. Motors, 1/2 HP and Larger: Test at final balanced conditions and record the following data: 1. Manufacturer's name, model number, and serial number. 2. Motor horsepower rating. 3. Motor rpm. 4. Efficiency rating. 5. Nameplate and measured voltage, each phase. 6. Nameplate and measured amperage, each phase. 7. Starter thermal-protection-element rating. B. Motors Driven by Variable-Frequency Controllers: Test for proper operation at speeds varying from minimum to maximum. Test the manual bypass of the controller to prove proper operation. Record observations including name of controller manufacturer, model number, serial number, and nameplate data. 3.08 PROCEDURES FOR HEAT-TRANSFER COILS: A. Measure, adjust, and record the following data for each water coil: 1. Entering- and leaving-water temperature. 2. Water flow rate. THE KENT 23 05 93 - 8 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT 3. Water pressure drop. 4. Dry-bulb temperature of entering and leaving air. 5. Wet-bulb temperature of entering and leaving air for cooling coils. 6. Airflow. 7. Air pressure drop. B. Measure, adjust, and record the following data for each electric heating coil: 1. Nameplate data. 2. Airflow. 3. Entering- and leaving-air temperature at full load. 4. Voltage and amperage input of each phase at full load and at each incremental stage. 5. Calculated kilowatt at full load. 6. Fuse or circuit-breaker rating for overload protection. C. Measure, adjust, and record the following data for each steam coil: 1. Dry-bulb temperature of entering and leaving air. 2. Airflow. 3. Air pressure drop. 4. Inlet steam pressure. D. Measure, adjust, and record the following data for each refrigerant coil: 1. Dry-bulb temperature of entering and leaving air. 2. Wet-bulb temperature of entering and leaving air. 3. Airflow. 4. Air pressure drop. 5. Refrigerant suction pressure and temperature. 3.09 3.10 TOLERANCES: A. Set HVAC system's air flow rates and water flow rates within the following tolerances: 1. Supply, Return, and Exhaust Fans and Equipment with Fans: Plus or minus 10 percent. 2. Air Outlets and Inlets: Plus or minus 10 percent. 3. Heating-Water Flow Rate: Plus or minus 10 percent. 4. Cooling-Water Flow Rate: Plus or minus 10 percent. 3.11 REPORTING: A. Initial Construction-Phase Report: Based on examination of the Contract Documents prepare a report on the adequacy of design for systems' balancing devices. Recommend changes and additions to systems' balancing devices to facilitate proper performance measuring and balancing. Recommend changes and additions to HVAC systems and general construction to allow access for performance measuring and balancing devices. B. Status Reports: Prepare monthly progress reports to describe completed procedures, procedures in progress, and scheduled procedures. Include a list of deficiencies and THE KENT 23 05 93 - 9 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT problems found in systems being tested and balanced. Prepare a separate report for each system and each building floor for systems serving multiple floors. 3.12 FINAL REPORT: A. General: Prepare a certified written report; tabulate and divide the report into separate sections for tested systems and balanced systems. 1. Include a certification sheet at the front of the report's binder, signed and sealed by the certified testing and balancing engineer. 2. Include a list of instruments used for procedures, along with proof of calibration. B. Final Report Contents: In addition to certified field-report data, include the following: 1. Pump curves. 2. Fan curves. 3. Manufacturers' test data. 4. Field test reports prepared by system and equipment installers. 5. Other information relative to equipment performance; do not include Shop Drawings and product data. C. General Report Data: In addition to form titles and entries, include the following data: 1. Title page. 2. Name and address of the TAB contractor. 3. Project name. 4. Project location. 5. Architect's name and address. 6. Engineer's name and address. 7. Contractor's name and address. 8. Report date. 9. Signature of TAB supervisor who certifies the report. 10. Table of Contents with the total number of pages defined for each section of the report. Number each page in the report. 11. Summary of contents including the following: a. Indicated versus final performance. b. Notable characteristics of systems. c. Description of system operation sequence if it varies from the Contract Documents. 12. Nomenclature sheets for each item of equipment. 13. Data for terminal units, including manufacturer's name, type, size, and fittings. 14. Notes to explain why certain final data in the body of reports vary from indicated values. 15. Test conditions for fans and pump performance forms including the following: a. Settings for outdoor-, return-, and exhaust-air dampers. b. Conditions of filters. c. Cooling coil, wet- and dry-bulb conditions. d. Face and bypass damper settings at coils. e. Fan drive settings including settings and percentage of maximum pitch diameter. f. Inlet vane settings for variable-air-volume systems. g. Settings for supply-air, static-pressure controller. THE KENT 23 05 93 - 10 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT h. Other system operating conditions that affect performance. D. System Diagrams: Include schematic layouts of air and hydronic distribution systems. Present each system with single-line diagram and include the following: 1. Quantities of outdoor, supply, return, and exhaust airflows. 2. Water and steam flow rates. 3. Duct, outlet, and inlet sizes. 4. Pipe and valve sizes and locations. 5. Terminal units. 6. Balancing stations. 7. Position of balancing devices. E. Air-Handling-Unit Test Reports: For air-handling units with coils, include the following: 1. Unit Data: a. Unit identification. b. Location. c. Make and type. d. Model number and unit size. e. Manufacturer's serial number. f. Unit arrangement and class. g. Discharge arrangement. h. Sheave make, size in inches, and bore. i. Center-to-center dimensions of sheave, and amount of adjustments in inches. j. Number, make, and size of belts. k. Number, type, and size of filters. 2. Motor Data: a. Motor make, and frame type and size. b. Horsepower and rpm. c. Volts, phase, and hertz. d. Full-load amperage and service factor. e. Sheave make, size in inches, and bore. f. Center-to-center dimensions of sheave, and amount of adjustments in inches. 3. Test Data (Indicated and Actual Values): a. Total air flow rate in cfm. b. Total system static pressure in inches wg. c. Fan rpm. d. Discharge static pressure in inches wg. e. Filter static-pressure differential in inches wg. f. Preheat-coil static-pressure differential in inches wg. g. Cooling-coil static-pressure differential in inches wg. h. Heating-coil static-pressure differential in inches wg. i. Outdoor airflow in cfm. j. Return airflow in cfm. k. Outdoor-air damper position. l. Return-air damper position. m. Vortex damper position. THE KENT 23 05 93 - 11 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT F. Apparatus-Coil Test Reports: 1. Coil Data: a. System identification. b. Location. c. Coil type. d. Number of rows. e. Fin spacing in fins per inch o.c. f. Make and model number. g. Face area in sq. ft.. h. Tube size in NPS. i. Tube and fin materials. j. Circuiting arrangement. 2. Test Data (Indicated and Actual Values): a. Air flow rate in cfm. b. Average face velocity in fpm. c. Air pressure drop in inches wg. d. Outdoor-air, wet- and dry-bulb temperatures in deg F. e. Return-air, wet- and dry-bulb temperatures in deg F. f. Entering-air, wet- and dry-bulb temperatures in deg F. g. Leaving-air, wet- and dry-bulb temperatures in deg F. h. Water flow rate in gpm. i. Water pressure differential in feet of head or psig. j. Entering-water temperature in deg F. k. Leaving-water temperature in deg F. l. Refrigerant expansion valve and refrigerant types. m. Refrigerant suction pressure in psig. n. Refrigerant suction temperature in deg F. o. Inlet steam pressure in psig. G. Electric-Coil Test Reports: For electric furnaces, duct coils, and electric coils installed in central-station air-handling units, include the following: 1. Unit Data: a. System identification. b. Location. c. Coil identification. d. Capacity in kW. e. Number of stages. f. Connected volts, phase, and hertz. g. Rated amperage. h. Air flow rate in cfm. i. Face area in sq. ft. j. Minimum face velocity in fpm. 2. Test Data (Indicated and Actual Values): a. Heat output in kW. b. Air flow rate in cfm. c. Air velocity in fpm. d. Entering-air temperature in deg F. e. Leaving-air temperature in deg F. f. Voltage at each connection. THE KENT 23 05 93 - 12 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT g. Amperage for each phase. H. Fan Test Reports: For supply, return, and exhaust fans, include the following: 1. Fan Data: a. System identification. b. Location. c. Make and type. d. Model number and size. e. Manufacturer's serial number. f. Arrangement and class. g. Sheave make, size in inches, and bore. h. Center-to-center dimensions of sheave, and amount of adjustments in inches. 2. Motor Data: a. Motor make, and frame type and size. b. Horsepower and rpm. c. Volts, phase, and hertz. d. Full-load amperage and service factor. e. Sheave make, size in inches, and bore. f. Center-to-center dimensions of sheave, and amount of adjustments in inches. g. Number, make, and size of belts. 3. Test Data (Indicated and Actual Values): a. Total airflow rate in cfm. b. Total system static pressure in inches wg. c. Fan rpm. d. Discharge static pressure in inches wg. e. Suction static pressure in inches wg. I. Round, Flat-Oval, and Rectangular Duct Traverse Reports: Include a diagram with a grid representing the duct cross-section and record the following: 1. Report Data: a. System and air-handling-unit number. b. Location and zone. c. Traverse air temperature in deg F. d. Duct static pressure in inches wg. e. Duct size in inches. f. Duct area in sq. ft. g. Indicated air flow rate in cfm. h. Indicated velocity in fpm. i. Actual air flow rate in cfm. j. Actual average velocity in fpm. k. Barometric pressure in psig. J. Air-Terminal-Device Reports: 1. Unit Data: a. System and air-handling unit identification. b. Location and zone. c. Apparatus used for test. d. Area served. THE KENT 23 05 93 - 13 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT e. Make. f. Number from system diagram. g. Type and model number. h. Size. i. Effective area in sq. ft.. 2. Test Data (Indicated and Actual Values): a. Air flow rate in cfm. b. Air velocity in fpm. c. Preliminary air flow rate as needed in cfm. d. Preliminary velocity as needed in fpm. e. Final air flow rate in cfm. f. Final velocity in fpm. g. Space temperature in deg F. K. Pump Test Reports: Calculate impeller size by plotting the shutoff head on pump curves and include the following: 1. Unit Data: a. Unit identification. b. Location. c. Service. d. Make and size. e. Model number and serial number. f. Water flow rate in gpm. g. Water pressure differential in feet of head or psig. h. Required net positive suction head in feet of head or psig. i. Pump rpm. j. Impeller diameter in inches. k. Motor make and frame size. l. Motor horsepower and rpm. m. Voltage at each connection. n. Amperage for each phase. o. Full-load amperage and service factor. p. Seal type. 2. Test Data (Indicated and Actual Values): a. Static head in feet of head or psig. b. Pump shutoff pressure in feet of head or psig. c. Actual impeller size in inches d. Full-open flow rate in gpm. e. Full-open pressure in feet of head or psig. f. Final discharge pressure in feet of head or psig. g. Final suction pressure in feet of head or psig h. Final total pressure in feet of head or psig. i. Final water flow rate in gpm. j. Voltage at each connection. k. Amperage for each phase. L. Instrument Calibration Reports: 1. Report Data: a. Instrument type and make. THE KENT 23 05 93 - 14 THE KENT Issue Date 05.09.18 TESTING, ADJUSTING AND BALANCING THE KENT b. Serial number. c. Application. d. Dates of use. e. Dates of calibration. 3.13 INSPECTIONS: A. Initial Inspection: 1. After testing and balancing are complete, operate each system and randomly check measurements to verify that the system is operating according to the final test and balance readings documented in the final report. 2. Check the following for each system: a. Measure airflow of at least 10 percent of air outlets. b. Measure water flow of at least 5 percent of terminals. c. Measure room temperature at each thermostat/temperature sensor. Compare the reading to the set point. d. Verify that balancing devices are marked with final balance position. e. Note deviations from the Contract Documents in the final report. B. TAB Work will be considered defective if it does not pass initial inspections. If TAB Work fails, proceed as follows: 1. Recheck all measurements and make adjustments. Revise the initial report and balancing device settings to include all changes; resubmit the initial report and request a final inspection. 2. If the final inspection also fails, Owner may contract the services of another TAB contractor to complete TAB Work according to the Contract Documents and deduct the cost of the services from the original TAB contractor's final payment. C. Prepare test and inspection reports. 3.14 ADDITIONAL TESTS A. Balancing Agency shall make two (2) return inspection trips to the project within the one year warranty period of the project; one at near heating design conditions and one during air conditioning design conditions for the purpose of checking out those portions of the system that are not performing satisfactorily as determined by the Engineer. Balancing Agency shall make any additional adjustments required at this time. END OF SECTION