3 PHASE CFM = AIRFLOW ���������������������������������������� �������� ELECTRIC HEAT TEMP RISE METHOD 1 PHASE (Volts)(Amps)(3.413) 1.08(��T) Volts Amps ( )( )(5.91) T 1.08( �� ) Volts = _______ Amps = _______ Volts = _______ Amps = _______ †Sup. Air Temp. ____°F - Ret. Air Temp.____°F = ��T †Sup. Air Temp. ____°F - Ret. Air Temp.____°F = ��T cfm = ______ft3/min cfm = ______ft3/min TEMPERATURE VS. ENTHALPY Wet-Bulb (F) Btu/LB Wet-Bulb (F) Btu/LB Wet-Bulb (F) Btu/LB Wet-Bulb (F) Btu/LB Wet-Bulb (F) Btu/LB Wet-Bulb (F) Btu/LB 40 15.23 48 19.21 56 23.84 64 29.31 72 35.83 80 43.69 41 15.7 49 19.75 57 24.48 65 30.06 73 36.74 81 44.78 42 16.17 50 20.3 58 25.12 66 30.83 74 37.66 82 45.9 43 16.66 51 20.86 59 25.78 67 31.62 75 38.61 83 47.04 44 17.15 52 21.44 60 26.46 68 32.42 76 39.57 84 48.22 45 17.65 53 22.02 61 27.15 69 33.25 77 40.57 85 49.43 46 18.16 54 22.62 62 27.85 70 34.09 78 41.58 47 18.68 55 23.22 63 28.57 71 34.95 79 42.62 INDOOR COIL (EVAPORATOR) DIFFERENCE OUTDOOR COIL (CONDENSOR) ENTERING LEAVING ENTERING W.B. (Air) D.B. Enthalpy ��h = Btu/LB CONDENSOR CAPACITY EVAPORATOR CAPACITY BTUH = 1.10 x COND. Cfm x ��T BTUH = 4.5 x cfm x ��h Due to varying field condidtions, a tolerance of 10% must be expected when comparing test data to actual performance. OTHER METHODS TO CHECK AIRFLOW LEAVING Belt Driven Blowers Total External Method Blower Speed = _______rpm Dimater of Pulley = ______in # Of Turns = ______Open Static Pressure = ______ w.c. DIFFERENCE ��T = °F Ret. Static + Sup. Static = Total External Static Refer to Product Data Sheets for rpm vs static NOTE: 350-400 CFM PER TON Presssure airflow charts. NOTES Furnace cfm = INDOOR DRY BULB ADJUSTMENT btu output 1.08(��T) Use equations below in conjunction with unit's "Tech Label" information for total and sensible capacities @ indoor dry bulbs other than 80°F entering coil. Sensible Capacity at Indoor db LOWER than 80°F = Sensible Capacity at Indoor db HIGHER then 80°F= Use the Total External Static in conjunction with the "Blower Performance" data in the Product Specification Sheets or the unit's "Tech Label". (MBh x S/T) – (80-Indoor db) x 835 x Indoor cfm 1000 ( ) (MBh x S/T) + (Indoor db-80) x 835 x Indoor cfm 1000 ( ) �������������������������������������������������������������������������������������������������������� 116 ������������������������������������������������������������������������������ www.uri.com www.goarcoaire.com 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. ������������������������������International Comfort Products ������������������ 4010683000��
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