Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT15990 – Testing, Adjusting, and BalancingIssue Date:September 28, 2012Page #:8 of 11A. Cut insulation, ductwork, and piping for installation of test probes to theminimum extent necessary to allow adequate performance of procedures.B. Patch insulation, ductwork, and housings, using materials identical to thoseremoved.C. Seal ducts and piping, and test for and repair leaks.D. Seal insulation to reestablish integrity of the vapor barrier.E. Mark equipment settings, including damper control positions, valve indicators,fan speed control levers, and similar controls and devices, to show final settings.Mark with paint or other suitable, permanent identification materials.F. As part of the scope of this specification section, the Contractor shall make anychanges in the pulleys, belts, or sheaves, as required, for correct balance at noadditional cost to the Owner.G. Retest, adjust, and balance systems subsequent to significant systemmodifications, and resubmit test results.H. Retest, adjust, and balance systems a second time if required for "comfort"balance.3.4 AIR SYSTEM BALANCING PROCEDUREA. Prepare individual schematic drawings of each air system.B. Perform a system profile of all air systems indicating on the previously developedsketch the pressure drop of each air handler component, including the inlet anddischarge plenums.C. Artificially load the air filters in air handling units to simulate the midpointresistance. Balance the duct distribution system when in this mode.D. Determine best locations in main and branch ductwork for most accurate ducttraverses. Establish overall fan flow at or above design point.E. Establish airflow at all terminal inlets and outlets at design point. If necessary,adjust main fan speed to deliver more air. Determine leakage based on differencebetween main system traverse and sum of terminal inlets and outlets.TESTING, ADJUSTING, AND BALANCING159908