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Southern Human Services Center Smith Sinnett /2020072 <br />HVAC and Roof Renovations Orange County,North Carolina <br />Testing,Adjusting,and Balancing for HVAC <br /> 23 05 93 - 4 <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 <br />suited 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 <br />identical 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 />K.Seal insulation to re-establish integrity of vapor barrier. <br />L.Retest,adjust,and balance systems subsequent to significant system modifications and resubmit <br />test results. <br />3.06 AIR SYSTEM PROCEDURE <br />A.Adjust air handling and distribution systems to provide required or design supply,return,and <br />exhaust air quantities at site altitude. <br />B.Test,adjust,and balance the air systems before the hydronic systems. <br />C.Make air quantity measurements in ducts by Pitot tube traverse of entire cross sectional area of <br />duct. <br />D.Measure air quantities at air inlets and outlets. <br />E.Adjust distribution system to obtain uniform space temperatures free from objectionable drafts and <br />noise.This includes adjusting the deflection of all diffuser and grilles. <br />F.Use volume control devices to regulate air quantities only to extent that adjustments do not create <br />objectionable air motion or sound levels. Effect volume control by duct internal devices such as <br />dampers and splitters. <br />G.Vary total system air quantities by adjustment of fan speeds. Provide drive changes required. <br /> Vary branch air quantities by damper regulation. <br />H.Measure static air pressure conditions on air supply units,including filter and coil pressure drops, <br />and total pressure across the fan. Make allowances for 50 percent loading of filters. <br />I.Coordinate with Controls Contractor on adjusting static pressure setpoints of VAV systems and <br />differential pressure setpoints of VFD controlled pumps. <br />J.Adjust outside air automatic dampers,outside air,return air,and exhaust dampers for design <br />conditions. <br />K.Measure temperature conditions across outside air,return air,and exhaust dampers to check <br />leakage. <br />L.Where modulating dampers are provided,take measurements and balance at extreme conditions. <br />Balance variable volume systems at maximum air flow rate,full cooling,and at minimum air flow <br />rate,full heating. <br />DocuSign Envelope ID: 94E7997D-4F29-42F6-A9B4-0A160438D2A6