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A. Air Balance: <br /> 1. The Contractor shall prepare the air systems for balancing and verify same in writing for <br /> test and balance firm as follows: <br /> a. Mechanically check fans, blowers and air handling equipment and make such <br /> available to operate under design conditions. <br /> b. Set volume dampers, air dampers and vanes in their normal position. <br /> C. Set grilles, diffusers, etc. installed with vanes, blades in their normal position. <br /> d. Mechanically check controls and make available to operate under design <br /> conditions. <br /> e. Mark damper shafts and locking devices to accurately represent the position of <br /> their respective dampers when in optimum position. Verify proper operation of all <br /> automatically operated dampers. <br /> 2. The test and balance firm shall perform the following tests and balance as follows: <br /> a. Test and adjust fan RPM to design requirements. <br /> b. Test and record motor full load amperes. <br /> C. Make pitot tube traverse of main supply and return ducts and obtain design CFM <br /> at fans. <br /> d. Test and record system total pressures, suction and discharge. <br /> e. Test and adjust system for design CFM recirculated air. <br /> f. Test and adjust system for design CFM outside air. <br /> g. Test and record entering air temperatures (D.B. heating and cooling, W.B. <br /> cooling.) <br /> h. Test and record leaving air temperatures. (D.B. heating and cooling, W.B. <br /> cooling.) <br /> i. Adjust all main supply and return air ducts to proper design CFM. <br /> j. Adjust all zones to proper design CFM (-5/+10%), supply and return. <br /> k. Test and adjust each diffuser, grille and register to within —5/+10% of design <br /> requirements. <br /> I. Each grille, diffuser and register shall be identified as to location, area and <br /> system. <br /> M. Test and record all room temperatures and humidity upon completion of system <br /> balances, DB and WB. Test shall be made near room thermostat where installed <br /> at four feet above floor. <br /> 3. Variable Air Volume Systems shall be balanced according to the specific type of VAV <br /> system supplied and method of controlling air flow. The following requirements shall be <br /> met: <br /> a. Verify that inlet ducts have sufficient straight runs (4-6 diameters) before VAV <br /> boxes and the VAV box manufacturer's control system complements the building <br /> control system. <br /> b. Determine the minimum and maximum operating pressures for the boxes used <br /> and verify that the operating conditions fall within the design operating range. <br /> C. Check static pressures and volume flows and adjust to proper values as <br /> necessary. Test and report air flow under minimum settings. <br /> d. Set outlets to design flow with VAV box on maximum setting. <br /> 4. Size, type, manufacturer and location of diffusers, grilles, registers, and all test equipment <br /> shall be identified and listed. Manufacturer's ratings on all equipment shall be used to <br /> make required calculations. <br /> 5. Readings and tests of diffusers, grilles, and registers shall include test resultant velocity, <br /> required CFM and test resultant CFM after adjustments. <br /> 6. In cooperation with the control manufacturer's representative, the test and balance firm <br /> shall set adjustments of automatically operated dampers to operate as specified, <br /> indicated, and/or noted. <br /> 7. Check all controls for proper calibrations and list all controls requiring adjustment by <br /> control installers. <br /> 8. Diffusers, grilles and registers shall be adjusted to minimize drafts in all areas. <br /> CEA#18010 TESTING,ADJUSTING AND BALANCING 23 05 93-5 <br /> COPYRIGHT©2018 CONSULTING ENGINEERING ASSOCIATES, INC. <br />