AIRFLOW ���������������������������������������� �������� Distributor: Job Site Reference: Dealer: Installation Date: Technician's Name: Fail Date: MODEL INFO Model # Serial # Outdoor/Package Unit: Control Voltage:_________ Vac ELECTRICAL INFO Indoor Unit: Supply Voltage:______ Vac ��____ Air Cleaner: 3 Phase (��) Voltages: T1��T2______Vac Thermostat: Electronic Air Cleaner: Humidifier: DUCT SIZE T1��T3______Vac T2��T3_____Vac SQUARE DUCT Area = h x w ROUND DUCT Area = Height (h): _______ in Diameter (d) = _______ in Width (w): _______ in �� = 3.14 Cross Section Area of d ) 2 Cross Sectional Area of Round Duct: d ) 2 Square Duct: h x w = _______in2 =_______in2 *Traversing The Duct Height (h) Width (w) Diameter (d) NOTE: If using a Hot Wire or a Vane Anemometer, skip to filling out table in step 3. 6" 8" A D G J B E H K C F I L G HI A B C D E F K J L 16"�� Point Facing Airflow Velocity Pressure = Total Pressure - Static Pressure Pressure Method "Pitot Tube" 1. Divide your duct into equal sections taking your measurements approximately every two inches. Refer to duct diagrams to the right for examples. Take pressure measurements at letter designations. 2. Using your pitot tube and the equation to the right find the Velocity Pressure at each point and record them below. PITOT TUBE A = ______ w.c. D = ______ w.c. G = ______ w.c. J = ______ w.c. M = ______ w.c. B = ______ w.c. E = ______ w.c. H = ______ w.c. K = ______ w.c. N = ______ w.c. C = ______ w.c. F = ______ w.c. I = ______ w.c. L = ______ w.c. O = ______ w.c. Velocity = 4,005 Velocity Pressure 3. Convert your recorded Velocity Pressures above into Velocity by using the equation to the right and recording in the table below. A = ______ ft/min. D = ______ ft/min. G = ______ ft/min. J = ______ ft/min. M = ______ ft/min. B = ______ ft/min. E = ______ ft/min. H = ______ ft/min. K = ______ ft/min. N = ______ ft/min. C = ______ ft/min. F = ______ ft/min. I = ______ ft/min. L = ______ ft/min. O = ______ ft/min. 4. Add all the Velocities together and divide by the number of measurements to get an Average Velocity. (Use calculated Velcoities from the table in step 3.) CFM = Average Velocity = _______ft/min. Cross Sectional Area (in ) x Average Velocity (ft/min) 22 cfm = ________ft3/min 5. Multiply your Average Velocity by your Cross Sectional Duct Area to get your Airflow in cfm. † Temperature rise is equal to the supply air temp. minus the return air temp. at steady state operation. The supply air temp. should be measured away form the line of sight of the heat exchanger. *In small ducts or where traverse operations are otherwise impossible, an accuracy of ±5% can frequently be achieved by placing Pitot tube or Anemometer in center of duct. Determine velocity from the reading, then multiply by 0.9 for an approximate average velocity. �������������������������������������������������������������������������������������������������������� 115 ������������������������������������������������������������������������������ www.uri.com www.goarcoaire.com Total Static �� ( 2 �� ( 2 �� 144 ������������������������������International Comfort Products ������������������ 4010683000��
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